PCOS – Diet, Supplements, and Natural Support for Polycystic Ovary Syndrome

For PCOS, improving insulin sensitivity is crucial – insulin resistance drives hyperandrogenism, ovulatory dysfunction, and weight management difficulties in 70-80% of women with this diagnosis. The best-documented tools include a low-glycemic diet, regular physical activity, and supplements with a real evidence base: myo-inositol, vitamin D3, and omega-3 fatty acids. Natural interventions work most effectively when applied simultaneously and consistently – effects appear after 3-6 months, not after a week.

This article is intended for women who want to understand the mechanisms of PCOS and consciously manage its symptoms – regardless of whether they are newly diagnosed or have been struggling with it for years. Here you will find dietary principles and specific lists of recommended and discouraged products, a review of supplements with an assessment of evidence quality and approximate dosages, tips on physical activity, stress management, and fertility. Where the scope of natural methods ends and medical intervention is necessary, we state it clearly.

1. What is PCOS and how is it diagnosed?

Polycystic Ovary Syndrome (PCOS) is one of the most common hormonal disorders in women of reproductive age. Although the name suggests a purely gynecological problem, PCOS is in fact a complex metabolic-endocrine disorder – its consequences extend far beyond the reproductive system and include insulin metabolism, the nervous system, inflammation, and many other areas.

1.1. Rotterdam diagnostic criteria

The diagnosis of PCOS is based on the so-called Rotterdam criteria, developed in 2003 by a joint consensus of the European Society of Human Reproduction and Embryology (ESHRE) and the American Society for Reproductive Medicine (ASRM). To make a diagnosis, at least 2 out of 3 criteria must be met – after previously excluding other causes of these symptoms (including hyperprolactinemia, thyroid diseases, congenital adrenal hyperplasia):

1. Oligo-ovulation or anovulation – irregular menstrual cycles (longer than 35 days or fewer than 8 cycles per year) or their complete absence
2. Clinical or biochemical signs of hyperandrogenism – acne, hirsutism, androgenetic alopecia, or elevated androgen levels (testosterone, DHEA-S) in laboratory tests
3. Polycystic ovarian morphology on ultrasound – presence of 12 or more follicles measuring 2–9 mm or an ovarian volume greater than 10 ml (according to newer guidelines, the threshold has been raised to 20+ follicles)

1.2. Symptoms and diversity of clinical presentations

PCOS is an exceptionally heterogeneous disorder – two women with the same diagnosis can look and feel completely different. Symptoms vary in severity and combination, which means that diagnosis is sometimes delayed by several years.

Most commonly reported symptoms:

• Irregular periods or their complete absence
• Acne – often persistent or recurring after adolescence, especially on the lower face and jawline
• Hirsutism – excessive hair growth on the face, chest, abdomen, or thighs
• Androgenetic alopecia (thinning hair on the top of the head)
• Difficulty conceiving due to ovulatory dysfunction
• Tendency to gain weight or difficulty losing it, especially around the abdomen
• Dark skin discolorations in body folds (acanthosis nigricans) – a characteristic sign of insulin resistance
• Chronic fatigue and fluctuations in energy levels
• Mood disorders: depressive episodes, anxiety, irritability

1.3. Scale of the problem – epidemiological data

According to World Health Organization (WHO) data, PCOS affects 8–13% of women of reproductive age, making it one of the most common endocrine disorders in this group. The global number of cases is estimated at over 100 million women.

Despite this scale, the problem is severely underdiagnosed. Symptoms are sometimes treated as separate ailments – acne by a dermatologist, irregular periods by a gynecologist, overweight by a dietitian – without connecting them into a coherent clinical picture. As a result, the path to diagnosis sometimes takes years.

PCOS is associated with an increased risk of long-term metabolic complications, regardless of body weight, including:

• insulin resistance and type 2 diabetes
• cardiovascular diseases
• non-alcoholic fatty liver disease (NAFLD)
• depression and anxiety disorders
• sleep apnea

1.4. PCOS subtypes – why not every case looks the same

In functional and clinical approaches, four main subtypes of PCOS are increasingly distinguished. This is not an official diagnostic classification, but a practical tool that helps understand why the same syndrome has different mechanisms in different women and requires different management strategies. In practice, subtypes often overlap.

Scroll right to see the full table (on mobile devices) →

2. Insulin resistance and PCOS – why is this connection crucial?

Insulin resistance is not an official diagnostic criterion for PCOS, but it is present in an estimated 70–80% of women with this diagnosis – regardless of body weight. It is what drives many of the most bothersome symptoms: excess androgens, ovulatory dysfunction, weight gain, and difficulty losing weight. Understanding this mechanism is fundamental to effective PCOS management.

2.1. The role of insulin in the pathogenesis of PCOS

Insulin is a hormone produced by the pancreas, whose role is to enable cells to absorb glucose from the blood. In insulin resistance, cells stop responding properly to this signal, and the pancreas compensates by increasing insulin production – leading to hyperinsulinemia, i.e., chronically elevated insulin levels in the blood.

Hyperinsulinemia triggers several mechanisms directly related to PCOS:

• Stimulation of the ovaries to overproduce androgens – insulin acts on ovarian theca cells as an additional signal to produce testosterone and androstenedione
• Lowering SHBG levels (sex hormone-binding globulin) – this results in higher concentrations of free, biologically active testosterone in the blood, even if total testosterone is within the normal range
• Impairment of ovarian follicle maturation – excess insulin and androgens block the proper maturation of the dominant follicle and ovulation, leading to their accumulation in the form of the characteristic polycystic image
• Increased inflammation – hyperinsulinemia promotes pro-inflammatory signaling, which further exacerbates hormonal imbalances

2.2. Hyperandrogenism and insulin resistance

The relationship between insulin resistance and hyperandrogenism works both ways. Excess insulin stimulates androgen production, but androgens themselves – primarily testosterone – exacerbate insulin resistance at the cellular level, disrupting insulin receptor signaling in muscle and adipose tissue.

Clinically, this means that women with PCOS have a more difficult starting position in terms of insulin sensitivity than would result solely from their lifestyle or body weight. Acne, hirsutism, and androgenetic alopecia – the most common dermatological complaints in PCOS – are largely a consequence of this insulin-androgen loop.

For this reason, interventions that improve insulin sensitivity (diet, physical activity, inositol, berberine) have a dual effect: they directly reduce hyperinsulinemia and – secondarily – contribute to the normalization of the androgen profile.

2.3. How to assess if insulin resistance is part of the clinical picture?

Insulin resistance does not have a single, universally accepted diagnostic indicator – different guidelines specify different thresholds. In clinical practice, the most commonly used are:

Scroll right to see the full table (on mobile devices) →

2.4. Monitoring symptoms and biomarkers – what to track daily?

Regular monitoring of selected parameters allows for evaluating the effectiveness of implemented changes and early detection of deterioration. It's not about obsessively tracking every number, but about consciously building an understanding of one's own health over time.

Laboratory biomarkers worth regular control (every 3–6 months or as recommended by a doctor):

• Fasting insulin + fasting glucose → HOMA-IR
• Full androgen profile: total and free testosterone, DHEA-S, SHBG, androstenedione
• Thyroid profile (TSH, fT3, fT4) – hypothyroidism can mimic or exacerbate PCOS
• Vitamin D3 (25-OH-D) – deficiency is common in PCOS and affects insulin resistance
• High-sensitivity CRP (hsCRP) – inflammatory marker
• Lipid panel including TG/HDL ratio

Parameters for daily observation:

• Menstrual cycle regularity and length – cycle tracking apps (e.g., Natural Cycles, Clue, Flo) are genuinely helpful here
• Body weight and waist circumference – a waist circumference above 80 cm in women is an additional signal of metabolic risk
• Sleep quality and energy levels during the day
• Severity of skin symptoms (acne, hirsutism)

3. How does diet affect PCOS? General dietary principles

Diet is one of the best-documented tools for managing PCOS – and at the same time, one of the most overrated in oversimplified messages. There isn't a single "PCOS diet" that works the same for every woman. What unifies effective dietary approaches are several common mechanisms: stabilizing insulin levels, reducing inflammation, and providing nutrients essential for proper hormone synthesis.

3.1. Glycemic index and glycemic load – why do they matter?

The glycemic index (GI) indicates how quickly a given food causes blood glucose to rise after consumption. The glycemic load (GL) is a more precise measure – it considers both the GI of the food and the actual amount of carbohydrates in a serving. For women with PCOS and insulin resistance, both indicators are practically relevant, although the glycemic load is more useful in daily meal planning.

Meals with a high GI and GL cause a rapid rise in glucose, followed by an equally rapid insulin response. In conditions of insulin resistance, this response is excessive – the pancreas releases more insulin than needed, leading to hyperinsulinemia discussed in Chapter 2. The effects are not only an exacerbation of androgenism but also a quick return of hunger, energy fluctuations, and an increased tendency to accumulate visceral fat.

In practice, a low-GL diet means:

• Choosing complex carbohydrates instead of simple ones – whole grains, brown rice, quinoa, legumes instead of white bread, white flour pasta, sweets
• Combining carbohydrates with protein, fat, and fiber – this slows down glucose absorption and moderates the insulin response
• Avoiding products and beverages with added simple sugars, including fruit juices and sweetened drinks
• Eating whole fruits, not juices – the fiber contained in the fruit significantly lowers the actual glycemic load

3.2. Macronutrients – ratios of protein, fat, and carbohydrates

Research does not point to one optimal macronutrient distribution for all women with PCOS. The general direction emerging from available data is a moderate reduction of carbohydrates in favor of protein and healthy fats – without the need for extreme diets.

Protein plays a particularly important role for several reasons. It increases satiety, stabilizes post-meal glucose levels, and supports muscle mass maintenance – and muscles are the primary site for insulin-dependent glucose uptake. A general recommendation is 1.2–1.6 g of protein per kilogram of body weight, choosing high-quality sources: eggs, fish, legumes, lean meat, dairy (if tolerated).

Fats – especially monounsaturated (olive oil, avocado, nuts) and polyunsaturated omega-3 (fish, flaxseed, walnuts) – have anti-inflammatory effects and support the synthesis of steroid hormones. Saturated fatty acids in moderate amounts are not an issue; the problem is an excess of trans fats from highly processed foods.

Carbohydrates should not be eliminated, but their quality and quantity are crucial. Very low-carbohydrate (ketogenic) diets may offer short-term benefits for insulin sensitivity, but their long-term adequacy in PCOS is less well-studied, and in some women, excessive carbohydrate restriction can exacerbate HPA axis dysregulation and raise cortisol. A reasonable starting point is 40–45% of calories from low-glycemic load carbohydrates.

Scroll right to see the full table (on mobile devices) →

3.3. Anti-inflammatory diet and PCOS

Chronic low-grade inflammation is present in a significant portion of women with PCOS – regardless of subtype – and mutually drives insulin resistance and hyperandrogenism. An anti-inflammatory diet is not a separate eating protocol, but a set of principles for choosing foods that modulate the activity of pro-inflammatory pathways in the body.

Pillars of anti-inflammatory nutrition in PCOS:

• High antioxidant content – vegetables and fruits in various colors, especially those rich in polyphenols: berries, pomegranate, cherries, dark leafy greens, broccoli, bell peppers
• Omega-3 fatty acids – fatty marine fish (salmon, mackerel, sardines) at least 2–3 times a week or supplementation; they inhibit the production of pro-inflammatory eicosanoids
• Prebiotic fiber – legumes, onions, garlic, leeks, chicory; supports the gut microbiome, which has a documented impact on systemic inflammation levels
• Curcumin and other spices – turmeric, ginger, cinnamon have shown in studies to modulate inflammatory response; cinnamon additionally supports insulin sensitivity
• Elimination of major inflammatory triggers – highly processed foods, simple sugars, trans fats, alcohol

A detailed discussion of anti-inflammatory diet principles – with lists of recommended and discouraged products – can be found in the article: Anti-inflammatory diet – what to eat and what to avoid? A practical guide.

3.4. Mediterranean diet as a practical dietary model

The Mediterranean diet is the most well-researched dietary model in the context of PCOS. It combines the characteristics of a low-glycemic, anti-inflammatory, and micronutrient-rich diet – without the need to count macronutrients or eliminate entire food groups.

Studies indicate that adopting a Mediterranean diet in women with PCOS can contribute to improved insulin sensitivity, reduced markers of inflammation (including hsCRP), and beneficial changes in the androgen profile. Its foundation includes vegetables, fruits, legumes, whole grains, fish, extra virgin olive oil, and nuts – with limited consumption of red meat and processed foods.

From a PCOS perspective, particularly valuable elements of this model are:

• Extra virgin olive oil – rich in monounsaturated fatty acids and polyphenols with anti-inflammatory effects
• Legumes – high-quality plant protein with low GL and high fiber content
• Marine fish – primary source of long-chain omega-3 fatty acids (EPA and DHA)
• Nuts and seeds – healthy fats, magnesium, zinc, and fiber all in one
• Variety of vegetables and fruits – a wide profile of antioxidants and phytonutrients

4. What to eat and what to avoid with PCOS?

General dietary principles are one thing – but in practice, what matters is what ends up on your plate. Below you will find specific food groups that are worth incorporating into your PCOS diet, and those that most often exacerbate symptoms. Where scientific evidence is weaker or inconclusive, this has been clearly indicated.

4.1. Foods supporting hormonal and insulin balance

Non-starchy vegetables are the foundation of a PCOS diet. Spinach, kale, broccoli, cauliflower, zucchini, bell peppers, cucumber, celery, asparagus – they have a low glycemic load, high fiber content, and are a rich source of micronutrients directly involved in hormonal balance: magnesium, zinc, B vitamins.

Legumes are one of the best combinations for women with PCOS: plant protein, soluble fiber, low GI, and the presence of inositol – a substance discussed in detail in Chapter 5. Lentils, chickpeas, beans, edamame, peas – it's worth including them in your diet at least 3–4 times a week.

Fatty marine fish (salmon, mackerel, sardines, herring, tuna) provide long-chain omega-3 fatty acids (EPA and DHA), which have an inflammation-modulating effect and can contribute to beneficial changes in the androgen profile. The recommended minimum is 2–3 servings per week.

Eggs are a valuable and underestimated food for PCOS – they provide complete protein, choline essential for hormone synthesis, and vitamin D. Concerns about the impact of eggs on the lipid profile are not strongly supported by current research in individuals without diabetes.

Nuts and seeds – walnuts, almonds, Brazil nuts (selenium), pumpkin seeds (zinc and magnesium), flaxseed and chia seeds (lignans and plant-based omega-3) – are a valuable part of a diet supporting hormonal balance. A 30g daily serving is a practical benchmark.

Berries – blueberries, raspberries, strawberries, blackberries – have a low glycemic load and exceptionally high antioxidant content, including anthocyanins, which laboratory studies show influence inflammatory and insulin pathways.

Whole grains – oatmeal, quinoa, buckwheat, brown rice, spelt – are a better alternative to white flour products. Higher fiber and micronutrient content translates to a lower glycemic load and better satiety after a meal.

Fermented dairy products – natural yogurt, kefir, buttermilk – provide probiotics that support the gut microbiome and may be better tolerated by women with PCOS than sweet dairy products, due to their lower insulin index.

4.2. Foods exacerbating symptoms – what does the evidence say?

Sugar and high-glycemic load products are the category with the strongest scientific justification in the context of PCOS. Sweets, sweetened beverages, fruit juices, white bread, and processed breakfast cereals cause rapid insulin spikes, exacerbating hyperinsulinemia and androgenism. In this case, the recommendations are clear – restriction makes sense for almost every woman with PCOS.

Highly processed foods – fast food, ready meals, packaged snacks, confectionery – are a combination of trans fats, simple sugars, salt, and additives that have pro-inflammatory effects. Regular consumption of this food group correlates with increased inflammatory markers and worsened insulin sensitivity.

Alcohol disrupts estrogen metabolism in the liver and raises cortisol levels, negatively affecting hormonal balance. For PCOS – especially in variants with severe hyperandrogenism or insulin resistance – it is advisable to limit it to a minimum.

Dairy – here the picture is ambiguous. Some women with PCOS report an increase in acne and androgenization symptoms with higher consumption of milk, especially skim milk. The mechanism is debated: milk naturally contains hormones and stimulates IGF-1 secretion, which can enhance androgenization. However, evidence from clinical studies is mixed and does not justify recommending complete exclusion of dairy for all women with PCOS. It's worth observing your own reaction and – if symptoms suggest a connection – limiting milk on a trial basis for 6–8 weeks, while keeping fermented dairy products.

Gluten – similar to dairy, is often demonized in the context of PCOS more than the data warrant. There is no solid evidence that gluten itself exacerbates PCOS in women without celiac disease or confirmed intolerance. The benefits of a gluten-free diet observed in some cases probably result from the elimination of highly processed grain products, rather than the removal of gluten per se. For women without celiac disease, routine gluten elimination is not recommended.

4.3. Recommended and discouraged products – a summary

Scroll right to see the full table (on mobile devices) →

5. Supplements for PCOS – which ones are backed by research?

The market for supplements dedicated to PCOS is vast and full of exaggerated promises. Below, we discuss substances for which the evidence base is the strongest or most promising – with clear indications of the quality of this evidence and the limitations of each. Supplementation should be treated as a complement to diet and lifestyle, never as a substitute, and it is advisable to consult a doctor before introducing it – especially with coexisting conditions or pharmacotherapy.

5.1. Inositol – Myo-inositol and D-chiro-inositol

Inositol is a compound from the polyol group, naturally present in cells as a secondary messenger of the insulin signal. Two forms are particularly important in PCOS: myo-inositol (MI) and D-chiro-inositol (DCI). In women with PCOS, the ratio of these forms in tissues is disturbed – which translates into a poorer cellular response to insulin.

Myo-inositol is the dominant form in the ovaries and plays a key role in follicle maturation and FSH signaling. D-chiro-inositol acts mainly peripherally – in muscles and adipose tissue – supporting glucose storage. Research indicates that in women with PCOS, the level of DCI in the ovaries is abnormally high at the expense of MI, which disrupts the local response to FSH and can block ovulation.

The 40:1 ratio (MI:DCI) – reflecting the physiological ratio of these forms in plasma – is the most well-researched form of supplementation and shows beneficial effects on cycle regularity, androgen profile, and insulin parameters in several randomized clinical trials.

Scroll right to see the full table (on mobile devices) →

5.2. Vitamin D3 – extent of deficiencies in PCOS and importance for the cycle

Vitamin D deficiency is one of the most common laboratory abnormalities found in women with PCOS – many studies indicate a very high frequency of vitamin D deficiency in this group, with deficiencies usually being deeper than in the general female population. Vitamin D receptors (VDR) are present in the ovaries, endometrium, and pancreatic cells secreting insulin, suggesting its involvement in regulating many processes disturbed in PCOS.

Observational studies indicate a link between low 25-OH-D levels and increased insulin resistance, higher androgen levels, and less frequent ovulations in women with PCOS. Interventional studies with vitamin D supplementation suggest a beneficial effect on cycle regularity and metabolic parameters, although the strength of this evidence varies.

Dosage should be determined individually based on the result of a 25-OH-D test in the serum. Approximate ranges used in clinical practice for confirmed deficiency (level below 20 ng/ml) are 2,000–4,000 IU daily; for severe deficiencies, doses may be higher but require medical supervision. Vitamin D3 should be taken with a fat-containing meal and – at higher doses – consider combining with vitamin K2 (MK-7), which supports the proper direction of calcium to the bones.

Vitamin D3+K2 drops 30 ml - Aura Herbals

5.3. Omega-3 fatty acids – anti-inflammatory effects and impact on androgens

Long-chain omega-3 fatty acids – EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) – are among the most thoroughly researched substances in the context of inflammatory processes. In PCOS, their importance stems from several mechanisms: inhibition of pro-inflammatory eicosanoids, modulation of inflammatory gene expression (NF-κB pathway), and potential effects on lipid and androgen metabolism.

Meta-analyses of clinical studies suggest that omega-3 supplementation in women with PCOS may contribute to lowering triglyceride levels, free testosterone, and inflammatory markers (CRP, IL-6). This evidence is promising, although studies vary in dosage and duration, making definitive conclusions difficult.

Dosage: Studies on PCOS typically used 2–4 g of EPA+DHA daily. When choosing a supplement, it's worth noting the total content of EPA and DHA (not just fish oil) – and the ester or triglyceride (TG) form, with the TG form showing better bioavailability. Omega-3s are best taken with a fat-containing meal.

OLICAPS Omega-3 60 capsules - ForMeds

5.4. Magnesium – role in insulin resistance and stress regulation

Magnesium participates in over 300 enzymatic reactions, including insulin signaling at the receptor level. Magnesium deficiency is common in the general population – and in PCOS, data indicate an even higher frequency, partly due to increased magnesium loss through the kidneys in hyperinsulinemia.

Magnesium contributes to the proper functioning of the nervous and muscular systems and to reducing feelings of fatigue and tiredness – which is particularly important in PCOS, where fatigue and mood disturbances are common complaints. Supporting the HPA axis through adequate magnesium levels is also an element of mitigating stress reactivity, as discussed in more detail in Chapter 7.

Forms and dosage: Not all forms of magnesium are absorbed equally well. For PCOS, the best documented or most commonly used are:

• Magnesium glycinate – high bioavailability, well tolerated by the digestive system, recommended for sleep disturbances and increased stress response
• Magnesium malate – well tolerated, may support energy production (Krebs cycle)
• Magnesium citrate – good bioavailability, slightly laxative effect at higher doses

The approximate daily dose is 200–400 mg of elemental magnesium, preferably in the evening or before bed.

BICAPS MAG B6 Magnesium and Vitamin B6 60 capsules - ForMeds

5.5. Zinc – hyperandrogenism and acne

Zinc contributes to maintaining normal blood testosterone levels – this is one of the health claims approved by EFSA for this element. In PCOS, where hyperandrogenism is a major problem, zinc has attracted justified interest.

Clinical studies with zinc supplementation in women with PCOS suggest a beneficial effect on the severity of acne, hirsutism, and – in some studies – on insulin resistance parameters. Zinc inhibits the activity of 5-alpha-reductase, an enzyme that converts testosterone into its more potent form – dihydrotestosterone (DHT), responsible for skin changes and androgenic alopecia.

Dosage: The most commonly used doses are 15–30 mg of elemental zinc daily. For long-term supplementation with doses above 25 mg, it is worth considering copper supplementation (approx. 1–2 mg), as zinc competes with copper for absorption in the intestines. Zinc is best taken with a meal, avoiding combining it with coffee, tea, and products rich in phytates (e.g., bran, seeds).

Zinc Bisglycinate 90 capsules - Vilgain

5.6. Berberine – effect on insulin sensitivity

Berberine is a plant alkaloid extracted from plants such as barberry, goldenseal, and Oregon grape. Its mechanism of action primarily involves activating AMPK kinase – an enzyme that plays a key role in glucose and lipid metabolism, sometimes referred to as the cell's "energy switch."

In several clinical studies conducted in women with PCOS, berberine supplementation was associated with an improvement in glycemic parameters – a reduction in fasting glucose and insulin and the HOMA-IR index – as well as favorable changes in lipid and androgen profiles. These results are promising, but the evidence base is still limited: studies are usually short-term, conducted on small groups, and have varying methodological quality.

Dosage used in studies: 500 mg 2–3 times daily with meals (total 1,000–1,500 mg daily). Due to potential effects on the digestive system (bloating, diarrhea), it is recommended to start with lower doses and gradually increase them.

5.7. NAC (N-acetylcysteine) – potential and limitations of the evidence base

N-acetylcysteine (NAC) is a precursor to glutathione – one of the body's main endogenous antioxidants. Interest in NAC in the context of PCOS stems from several mechanisms: antioxidant activity, potential effects on insulin signaling, and modulation of the inflammatory process.

The results of clinical trials with NAC in women with PCOS are mixed. Some studies suggest a beneficial effect on ovulation regularity, insulin sensitivity, and androgen levels, as well as on egg quality in women undergoing ovarian stimulation. Other studies show no significant differences. The evidence base is still insufficient to formulate clear recommendations for the routine use of NAC in PCOS.

Dosage used in studies: 600–1800 mg daily, usually in divided doses. NAC is generally well tolerated; rare side effects include nausea and stomach discomfort.

5.8. Summary of supplements for PCOS

Scroll right to see the full table (on mobile devices) →

6. Physical activity in PCOS – which type of training to choose?

Physical activity is one of the best-documented non-pharmacological interventions for PCOS – and one that acts multidirectionally at the same time: it improves insulin sensitivity, affects the androgen profile, reduces inflammation, and improves mood. The question is not "should I exercise," but "how should I exercise" to achieve maximum effect without unnecessarily burdening the cortisol axis.

6.1. Strength training vs. cardio – what do studies say?

For years, aerobic training was the default recommendation for PCOS, mainly due to its documented effect on insulin sensitivity and weight reduction. However, newer studies indicate that strength (resistance) training offers at least equivalent, and in some respects superior, benefits – especially in the context of long-term improvement in body composition and glucose metabolism.

The mechanism is simple: skeletal muscle is the primary site of insulin-dependent glucose uptake. The greater the muscle mass and the better its insulin sensitivity, the more effectively glucose is removed from the blood after a meal. Strength training builds and maintains muscle mass, and the effect of improved insulin sensitivity lasts for several to tens of hours after a session – which is not observed to the same extent after moderate-intensity aerobic training.

Cardio training – especially of moderate intensity and medium duration – has, in turn, a more strongly documented effect on reducing visceral fat, lowering inflammatory markers, and improving cardiovascular function. In PCOS, where the risk of metabolic and cardiovascular diseases is elevated, regular aerobic activity remains an important part of the puzzle.

Scroll right to see the full table (on mobile devices) →

6.2. Training intensity vs. cortisol and androgens

In PCOS, the intensity of physical activity matters beyond just calorie-burning efficiency. Every training session is a physiological stressor – it activates the HPA axis and leads to an increase in cortisol. In moderate doses, this is an adaptive and desirable response. The problem arises when training is too intense, too frequent, or too long in relation to the body's regenerative capabilities.

Why is this particularly important in PCOS? Women with PCOS – especially those with the adrenal subtype or coexisting chronic stress – often already have elevated cortisol levels or a dysregulated HPA axis. Excessive training can lead to a further increase in cortisol, which:

• exacerbates insulin resistance by directly affecting insulin receptors
• stimulates the adrenal glands to produce androgens (DHEA-S)
• disrupts the hypothalamus-pituitary-ovarian axis, further dysregulating ovulation
• increases appetite for high-glycemic products and promotes the accumulation of visceral fat

This does not mean that women with PCOS should avoid intense exercise. It means that intense training – such as HIIT, CrossFit, intense strength training with heavy loads – should be dosed with regeneration in mind and should not be a daily practice, especially if other stressful loads (work, sleep, relationships) are concurrently high.

6.3. Practical recommendations – how to structure activity in PCOS?

The following recommendations are based on available guidelines and research data on PCOS, as well as general recommendations for physical activity for metabolic health.

Foundation – strength training 2–3 times a week:

• Compound exercises involving large muscle groups: squats, deadlifts, presses, rows
• Moderately high intensity: 65–80% of one-rep max (1RM), 3–4 sets of 8–12 repetitions
• Session duration: 45–60 minutes – longer sessions disproportionately prolong the cortisol response
• Rest between sessions a minimum of 48 hours for the same muscle group

Supplement – aerobic activity 2–3 times a week:

• Preferred forms of moderate intensity: brisk walking, cycling, swimming, dancing, Nordic walking
• Duration: 30–45 minutes at a heart rate corresponding to 60–70% of maximum (the so-called fat-burning zone) – here, the cortisol response is lowest with good metabolic efficiency
• HIIT (high-intensity interval training) can be part of the plan, but a maximum of 1–2 times a week and only when regeneration is good

Non-structural activity – an underestimated element:

• NEAT (Non-Exercise Activity Thermogenesis) – daily activity outside of planned training – has a significant impact on insulin sensitivity and does not generate a cortisol load
• A 10–15 minute walk after the main meal of the day effectively lowers the post-meal glucose and insulin spike – a simple habit with a documented metabolic effect
• Limiting sitting by taking breaks every 30–60 minutes is another inexpensive and effective intervention for insulin resistance

7. Stress, cortisol, and PCOS – why stress management is part of the puzzle

Stress is an element of every woman's daily life – but in PCOS, its physiological consequences are deeper and more directly related to hormonal destabilization than in the general population. Cortisol, the main stress hormone, does not act in isolation from other hormones: it affects insulin, androgens, and the hypothalamus-pituitary-ovarian axis in a way that can exacerbate each of the key problems of PCOS.

7.1. The HPA axis and hormonal balance in PCOS

The HPA axis (hypothalamic-pituitary-adrenal) is the body's main stress response system. In response to a stressful stimulus, the hypothalamus releases corticotropin-releasing hormone (CRH), which stimulates the pituitary gland to produce adrenocorticotropic hormone (ACTH), which in turn stimulates the adrenal glands to secrete cortisol. In conditions of acute, short-term stress, this is an adaptive and beneficial reaction. The problem arises with chronic stress – when the HPA axis operates in a state of continuous activation.

In women with PCOS – especially in the adrenal subtype – the HPA axis tends to be hyperreactive. This means that in response to the same stressful stimulus, the body produces more cortisol and for a longer period than in women without PCOS. The effects of chronic cortisol elevation directly overlap with the mechanisms of PCOS:

• Cortisol exacerbates insulin resistance – by acting antagonistically to insulin at the cellular receptor level, it raises blood glucose levels and forces higher insulin secretion
• Cortisol stimulates the production of adrenal androgens – ACTH stimulates the adrenal glands not only to produce cortisol but also DHEA-S, which exacerbates hyperandrogenism
• Cortisol inhibits GnRH secretion – gonadotropin-releasing hormone, essential for the proper pulsing of LH and FSH, which directly disrupts ovulation
• Cortisol promotes the accumulation of visceral fat – even with stable body weight, chronic stress shifts fat distribution towards the abdominal area, exacerbating insulin resistance

7.2. Sleep and Circadian Rhythm – the Hormonal Significance of Sleep Quality

Sleep is one of the most underestimated variables in PCOS management. Sleep deprivation – both quantitative (less than 7–8 hours) and qualitative (disturbances in sleep architecture) – affects hormonal balance through many parallel mechanisms.

Even one night of shortened sleep (to 4–5 hours) causes a measurable increase in insulin resistance the next day – comparable to the effect of several weeks on a high-sugar diet. In PCOS, where insulin sensitivity is already inherently reduced, regular sleep deprivation significantly hinders metabolic improvement despite a well-managed diet and physical activity.

Additionally, disturbed sleep:

• raises morning cortisol, intensifying the hormonal cascade described above
• lowers leptin levels (satiety hormone) and raises ghrelin (hunger hormone), which promotes excessive caloric intake and cravings for high-glycemic products
• disrupts the pulsatile secretion of LH at night – crucial for the proper functioning of the ovarian axis
• worsens depressive and anxiety states, which are already more common in women with PCOS

The circadian rhythm in PCOS has significance beyond just sleep duration. Cortisol exhibits a physiological circadian rhythm – peaking in the morning, gradually decreasing during the day, and reaching a minimum at night. Irregular sleep hours, shift work, evening exposure to blue light from screens, and late meals disrupt this rhythm, leading to a flattened morning cortisol peak and abnormal activity at night.

7.3. Practical Methods for Stress Reduction – What is Genuinely Supported by Data?

Stress management is an area where generalizations are easy. Below, I focus exclusively on methods that have at least moderate evidence in research – general or directly related to PCOS.

Breathing exercises and relaxation techniques – techniques that activate the parasympathetic nervous system (vagus nerve) have a documented impact on reducing cortisol and HPA axis reactivity. The most researched are diaphragmatic breathing (4–6 breaths per minute for 5–10 minutes daily) and mindfulness-based techniques (mindfulness, MBSR). Studies conducted in women with PCOS suggest that regular mindfulness practice can contribute to improved mood and reduced markers of oxidative stress.

Yoga holds a special place in PCOS research – several randomized clinical trials have shown a beneficial effect of regular yoga practice (3–5 sessions per week for 12 weeks) on androgen levels, cycle regularity, and anxiety parameters in women with PCOS. The mechanism includes both cortisol reduction and improved insulin sensitivity through muscle activation.

Regular moderate-intensity physical activity – discussed in detail in Chapter 6 – is one of the most strongly documented anti-stress interventions. Its impact on cortisol levels, mood, and sleep quality is independent of metabolic effects.

7.4. Adaptogens – Natural Support for Chronic Stress

Adaptogens are plants and substances that, in research, show the ability to modulate the body's response to stress – by normalizing HPA axis activity, rather than unilaterally suppressing it. In PCOS, where stress and cortisol dysregulation are significant elements of the clinical picture, several adaptogens deserve attention.

Ashwagandha (Withania somnifera) is the most researched adaptogen in the context of stress and cortisol. Clinical trials using ashwagandha root extract have shown statistically significant reductions in serum cortisol levels, improved sleep quality, and reduced subjective perception of stress. In PCOS, an additional point of interest is its potential effect on the thyroid (it may support the conversion of T4 to T3) and androgen modulation – however, data in this regard are preliminary. Typical dosages in studies: 300–600 mg of standardized extract daily. Ashwagandha is not recommended during pregnancy.

Organic Ashwagandha Powder 150g - Bio Planet

Rhodiola rosea (Rhodiola rosea) shows beneficial effects in clinical studies on mental fatigue, concentration, and adaptation to stress. Its mechanism of action differs from ashwagandha – it acts more strongly at the neurotransmitter level than directly on the HPA axis. It can be particularly useful in PCOS accompanied by severe fatigue and low mood. Dosage: 200–400 mg of standardized extract in the morning (may have a stimulating effect).

Lemon balm and valerian – herbs traditionally used to relieve nervous tension and difficulty falling asleep. Used in the evening as an infusion or supplement, they can be a helpful addition for sleep difficulties related to stress.

A detailed discussion of natural methods for lowering cortisol – with a comprehensive review of diet, herbs, and lifestyle interventions – can be found in the article: How to naturally lower cortisol? Diet, herbs, supplements, and lifestyle.

8. PCOS and Fertility – Natural Support When Trying to Conceive

PCOS is one of the most common causes of ovulation disorders and associated difficulties in becoming pregnant – accounting for approximately 70–80% of anovulatory infertility cases. At the same time, it is a disorder in which natural interventions – diet, physical activity, supplementation – have a documented effect on restoring ovulation and improving the hormonal environment. The boundary between what can be achieved independently and when medical help is necessary is clear and important in PCOS.

8.1. Ovulation in PCOS – What Restores It?

Ovulation disorders in PCOS result from several overlapping mechanisms: hyperinsulinemia blocking follicle maturation, excess androgens disrupting FSH signaling, chronic inflammation, and dysregulation of the hypothalamus–pituitary–ovarian axis. Restoring ovulation requires acting on these mechanisms simultaneously – rarely is one intervention sufficient.

Factors that, in clinical studies, are associated with the restoration or improvement of ovulation in PCOS:

• Weight reduction in overweight individuals – a 5–10% reduction in body weight in women with PCOS and a BMI above 25 is enough to restore ovulation in a significant portion of them. The mechanism involves improved insulin sensitivity and reduced androgens.
• Low glycemic load diet – insulin stabilization reduces its stimulating effect on ovarian androgen production and can restore proper follicle maturation.
• Myo-inositol – among supplements, it has the strongest evidence for its effect on ovulation regularity in PCOS; several clinical studies have shown restoration of ovulation in women with previous amenorrhea after 3–6 months of supplementation.
• Vitamin D3 – supplementation of deficiency is associated with improved cycle regularity in observational studies; the mechanism involves VDR receptors in the ovaries and an effect on AMH synthesis.
• Stress reduction and sleep normalization – through its effect on the HPA axis and pulsatile GnRH secretion, discussed in Chapter 7.
• Moderate-intensity physical activity – improved insulin sensitivity and reduced cortisol create a more favorable hormonal environment for ovulation.

8.2. The Role of Diet and Supplementation When Trying to Conceive

All dietary principles discussed in chapters 3 and 4 remain relevant when trying to conceive – a low-glycemic, anti-inflammatory diet rich in complete protein, healthy fats, and micronutrients is fundamental. However, some elements gain additional significance in the context of preparing for pregnancy.

Folic acid – its supplementation before pregnancy and in the first trimester is a medical standard regardless of PCOS. In PCOS, some women have an MTHFR gene polymorphism that impairs the conversion of folic acid to its active form (5-MTHF) – in such a case, the doctor may recommend supplementing with the active form of folates (metafolin, 5-MTHF) instead of classic folic acid.

Iron – with irregular or heavy periods accompanying PCOS, the risk of iron deficiency is higher. It is worth checking ferritin levels before pregnancy and supplementing any deficiency.

Myo-inositol – in addition to its effect on ovulation, studies conducted in women undergoing ovarian stimulation (IVF) suggest a beneficial effect of inositol on egg and embryo quality. This is one of the few supplements for which the data in the context of fertility in PCOS are relatively strong.

Omega-3 – DHA is a key structural component of the fetal brain and retina; its adequate level before and during pregnancy is an independent recommendation, reinforced by its anti-inflammatory action significant in PCOS.

Coenzyme Q10 – was not discussed in the chapter on supplements because its general evidence base in PCOS is weaker, but in the context of fertility, it deserves mention: CoQ10 supports the mitochondrial function of egg cells, and its level decreases with age. Preliminary data suggest a beneficial effect on egg quality, especially in women over 35 years of age.

8.3. When Medical Intervention is Necessary – A Clear Boundary

Natural methods supporting fertility in PCOS have real significance and are an important part of preparing for pregnancy. However, they have their limits – and recognizing the moment when medical help is necessary is as important as implementing diet or supplementation.

Consultation with a doctor (gynecologist or endocrinologist) is necessary when:

• Attempts to conceive have lasted for more than 12 months with regular intercourse (or 6 months if the woman is over 35 years old) – this is the standard definition of infertility requiring diagnosis.
• Cycles remain irregular or absent after 6 months of consistently implementing lifestyle changes and supplementation.
• Hormonal tests or ultrasound indicate additional factors requiring treatment (e.g., dominant cysts, suspected endometriosis, thyroid disorders).
• The partner has not been diagnosed for male factor infertility – which accounts for 40–50% of couple infertility cases and should be ruled out early in the diagnostic process.
• The woman is over 35 years old – time is particularly crucial here, and diagnosis should not be delayed.

Available medical interventions for PCOS and ovulation disorders – whose implementation and timing are decided solely by the doctor – include ovulation induction with letrozole or clomiphene, metformin for insulin resistance, gonadotropins if there is no response to first-line treatment, and if conservative treatment is ineffective – assisted reproductive procedures (IUI, IVF).

Scroll right to see the full table (on mobile devices) →

9. FAQ – Frequently Asked Questions about PCOS

9.1. Can PCOS be cured?

PCOS is not a disease that can be cured in the classical sense – there is no therapy that permanently eliminates this disorder. It is a chronic condition that can, however, be effectively managed and whose symptoms can be significantly alleviated or almost completely suppressed through an appropriate lifestyle, diet, and – if indicated – pharmacotherapy.

For many women, consistent lifestyle changes lead to the restoration of regular cycles, normalization of the androgen profile, and improvement of metabolic parameters – even though the genetic mechanism and predisposition to the disorder remain. PCOS is not a life sentence but requires a long-term approach, not a one-time intervention.

9.2. Does hormonal contraception "cure" PCOS?

No – hormonal contraception masks the symptoms of PCOS but does not treat its causes. The pill regulates bleeding, reduces acne and hirsutism by lowering androgens, but it does so by externally suppressing the hormonal axis – after discontinuing it, symptoms return, often with similar severity as before its introduction.

Contraception can be a justified choice for women who do not plan pregnancy and want to control symptoms – this is an individual decision made with a doctor. However, it is important to understand that the time of pill use is a time of "stopping the PCOS clock," not curing it. Working on insulin sensitivity, diet, and lifestyle makes sense regardless of whether a woman uses hormonal contraception or not.

9.3. How long does it take to see the effects of diet and supplementation changes?

This is one of the most common questions – and one of those for which there is no single answer, because the rate of improvement depends on the initial hormonal state, the severity of insulin resistance, the duration of symptoms, and the consistency of the implemented changes.

Approximate timeframes, which emerge from research and clinical practice:

• 2–4 weeks – improved well-being, stabilized energy throughout the day, reduced sweet cravings (effect of glycemic stabilization)
• 6–12 weeks – possible improvement in laboratory parameters (insulin, glucose, HOMA-IR), first changes in acne severity
• 3–6 months – onset or regulation of ovulation, clearer improvement in androgen profile, visible change in hirsutism and acne severity
• 6–12 months and longer – cycle stabilization, lasting improvement in metabolic parameters, reduction of hirsutism (hair growth is slow – effects are seen late)

If no improvement is seen after 6 months of consistent changes, it is worth returning to the doctor to verify if there are additional factors requiring medical intervention.

9.4. Is PCOS hereditary – is a daughter of a woman with PCOS at risk?

PCOS has a distinct genetic component. Family studies indicate that sisters and daughters of women with PCOS have a significantly higher risk of developing the condition than the general population – estimated at 20–40% depending on the diagnostic criteria used. However, this does not mean that PCOS is a purely genetic disease or that it is inevitable.

PCOS is polygenic – many genes with small individual effects combine with environmental factors (diet, physical activity, stress exposure, body weight). A daughter of a woman with PCOS who leads a healthy lifestyle from a young age may never develop symptoms – despite a genetic predisposition. Awareness of the risk is valuable here not as a cause for concern, but as motivation for prophylactic lifestyle care and cycle observation from its onset.

9.5. Is intermittent fasting a good strategy for PCOS?

Intermittent fasting (IF) arouses justified interest in PCOS due to its potential impact on insulin sensitivity and reduction of visceral fat tissue. Preliminary data – including several pilot studies conducted in women with PCOS – suggest that IF may contribute to improving insulin and androgen parameters.

However, reservations are significant. Firstly, the evidence base is still too narrow to formulate unequivocal recommendations. Secondly, in some women – particularly with severe cortisol dysregulation or a predisposition to eating disorders – long fasting windows can intensify metabolic stress and destabilize the HPA axis. Skipping breakfast by a woman with initially elevated cortisol may paradoxically worsen insulin management during the day.

IF can be a reasonable strategy for women with PCOS who tolerate the reduction of the eating window well and have no history of eating disorders – but it is not a universal approach. The priority should always be the quality of the diet, not its schedule.

9.6. Do coffee and caffeine exacerbate PCOS symptoms?

Coffee in PCOS is a topic that generates unnecessary concerns. Moderate coffee consumption – 1–3 cups a day – is not contraindicated in PCOS and probably does not exacerbate its symptoms. Coffee contains polyphenols with antioxidant properties and in population studies is associated with a lower risk of type 2 diabetes, not a higher one.

However, several issues require attention. Caffeine stimulates cortisol secretion – especially when consumed on an empty stomach and in large quantities – which can be detrimental in cases of severe HPA axis dysregulation. Coffee consumed in the afternoon can worsen sleep quality, which – as described in chapter 7 – has real hormonal consequences. The problem is also not the coffee itself, but what is added to it: sweetened syrups, condensed milk, and sugar turn coffee into a drink with a high insulin load.

In summary: coffee in reasonable amounts, without sugar, consumed not on an empty stomach and not in the afternoon – is not a product that women with PCOS must avoid.

10. Summary

PCOS is a complex metabolic-hormonal disorder that affects a huge number of women – and is still seriously underdiagnosed. Its driving force in most cases is insulin resistance, which, through hyperinsulinemia and hyperandrogenism, creates a self-sustaining cycle of disturbances. The good news is that precisely because it has specific, tangible mechanisms, PCOS responds well to conscious lifestyle changes.

Below is a summary of the most important conclusions from the entire article:

Diagnosis and understanding your own PCOS

• Diagnosis requires fulfilling at least 2 out of 3 Rotterdam criteria – a polycystic appearance of ovaries on ultrasound alone is not enough
• PCOS has several subtypes (insulin-dependent, inflammatory, adrenal, post-contraceptive) – identifying the dominant mechanism allows for more accurate selection of interventions
• Key tests for regular control: fasting insulin and glucose with calculated HOMA-IR, full androgen profile, vitamin D3, hsCRP, lipidogram, TSH

Diet

• There is no single "PCOS diet" – effective approaches combine insulin stabilization, anti-inflammatory action, and micronutrient quality
• A low glycemic load diet, rich in vegetables, legumes, fatty fish, nuts, and olive oil – i.e., the Mediterranean model – has the strongest research support
• Eliminations (gluten, dairy) are not routinely recommended without specific clinical justification
• Chronic stress associated with perfect adherence to the diet can genuinely exacerbate PCOS symptoms through cortisol – flexibility is part of the strategy

Supplementation

• Strongest evidence base: myo-inositol + D-chiro-inositol in a 40:1 ratio, vitamin D3 (after checking 25-OH-D levels), omega-3 fatty acids (EPA+DHA)
• Good evidence base with reservations: magnesium, zinc, berberine (medical consultation required, drug interactions)
• Supplementation complements, it does not replace diet and lifestyle
• The effects of supplementation are spread over time – a minimum of 3–6 months of consistent use

Physical activity

• A combination of strength training (2–3×/week) and moderate-intensity aerobic training (2–3×/week) yields better metabolic and hormonal results than each form separately
• Strength training is a priority – it builds muscle mass, which is the main site of glucose uptake
• Excessively intense training raises cortisol and can exacerbate PCOS symptoms – regularity is more important than intensity
• A 10–15-minute walk after a main meal effectively lowers post-meal glucose and insulin spikes

Stress, cortisol, and sleep

• Chronic stress increases insulin resistance, stimulates adrenal androgen production, and blocks ovulation through the HPA axis – stress management is part of the treatment, not an add-on
• The quality and regularity of sleep directly impact insulin sensitivity, cortisol, hunger hormones, and pulsatile LH secretion
• Breathing techniques, mindfulness (MBSR), and yoga have moderate research support as tools for cortisol reduction in PCOS
• Ashwagandha and rhodiola rosea are the best-researched adaptogens supporting the stress response

Fertility and the limit of medical intervention

• PCOS is one of the most common causes of anovulatory infertility – but naturally restored ovulation is a realistic goal for many women
• Key interventions when trying to conceive: low-glycemic diet, inositol, vitamin D3, folic acid (or active 5-MTHF form), omega-3
• After 12 months of trying (or 6 months over 35 years of age), infertility diagnosis for both partners and consultation with a doctor is necessary – delaying the visit is not a strategy

11. Sources

Below are the sources on which the key claims in the article are based. For claims regarding supplementation and physical activity, the text relies on a collective picture of available systematic reviews and clinical trials – in these cases, the nature of the evidence base is indicated instead of a single position.

Clinical guidelines and organizational statements

1. World Health Organization (WHO). Polycystic ovary syndrome. Fact Sheet. 2023.
   Available at: https://www.who.int/news-room/fact-sheets/detail/polycystic-ovary-syndrome
   Source of epidemiological data: 8–13% of women of reproductive age, over 100 million women worldwide.
2. Rotterdam ESHRE/ASRM-Sponsored PCOS Consensus Workshop Group. Revised 2003 consensus on diagnostic criteria and long-term health risks related to polycystic ovary syndrome (PCOS). Human Reproduction. 2004;19(1):41–47. PMID: 14711538.
   Basis for the Rotterdam diagnostic criteria used in Chapter 1.
3. Teede HJ, Misso ML, Costello MF et al. Recommendations from the international evidence-based guideline for the assessment and management of polycystic ovary syndrome. Human Reproduction. 2018;33(9):1602–1618.
   International guidelines for the diagnosis and management of PCOS – basis for clinical recommendations in the article.

Pathophysiology and epidemiology

4. Azziz R, Carmina E, Chen Z et al. Polycystic ovary syndrome. Nature Reviews Disease Primers. 2016;2:16057. DOI: 10.1038/nrdp.2016.57
   Comprehensive review of PCOS pathophysiology, including the role of insulin resistance and hyperandrogenism.
5. Dennett CC, Simon J. The role of polycystic ovary syndrome in reproductive and metabolic health: overview and approaches for treatment. Diabetes Spectrum. 2015;28(2):116–120.
   Discussion of PCOS subtypes and their varied clinical presentation.

Diet and nutritional interventions

6. Detailed discussion of the anti-inflammatory diet: Anti-inflammatory diet – what to eat and what to avoid? A practical guide. Żywioł Zdrowia Blog.
7. Detailed discussion of the Mediterranean diet: Mediterranean diet – principles, pyramid, and what to eat daily. Żywioł Zdrowia Blog.
8. The link between the Mediterranean diet and improved insulin and androgen parameters in PCOS is documented by systematic reviews published between 2019 and 2023, including in the journals Nutrients and Clinical Nutrition. Claims regarding the impact of diet on PCOS are based on the collective picture of these studies.

Supplementation

9. Unfer V, Carlomagno G, Dante G, Facchinetti F. Effects of myo-inositol in women with PCOS: a systematic review of randomized controlled trials. Gynecological Endocrinology. 2012;28(7):509–515. PMID: 22296306.
   Systematic review of RCTs on myo-inositol in PCOS – basis for claims in sub-chapter 5.1.
10. Monastra G, Unfer V, Harrath AH, Bizzarri M. Combining treatment with myo-inositol and D-chiro-inositol (40:1) is effective in restoring ovary function and metabolic profile in PCOS patients. Gynecological Endocrinology. 2017;33(1):1–9. PMID: 27898267.
    Basis for the recommendation regarding the MI:DCI 40:1 ratio discussed in sub-chapter 5.1.
11. EFSA health claim for zinc (zinc contributes to the maintenance of normal testosterone levels in the blood) – approved under Commission Regulation (EU) No 432/2012.
    EFSA register of health claims: https://www.efsa.europa.eu/en/interactive-pages/health-claims
12. Claims regarding vitamin D3, omega-3 fatty acids, magnesium, berberine, and NAC are based on a collective picture of systematic reviews and meta-analyses of clinical studies available in PubMed and the Cochrane Library databases. Due to the varied methodological quality of individual studies, appropriate hedging formulations were used for each of these substances in the text.

Physical activity

13. Harrison CL, Lombard CB, Moran LJ, Teede HJ. Exercise therapy in polycystic ovary syndrome: a systematic review. Human Reproduction Update. 2011;17(2):171–183. PMID: 20833639.
    Systematic review on the effect of various forms of physical activity on metabolic and hormonal parameters in PCOS.
14. Claims regarding the superiority of mixed training (strength + aerobic) over individual forms of activity are based on a collective picture of systematic reviews and RCTs published after 2015, including in the Journal of Clinical Endocrinology & Metabolism and Frontiers in Physiology.

Stress, cortisol, and sleep

15. Claims regarding the impact of HPA axis dysregulation on hormonal balance in PCOS, as well as the effects of mindfulness-based interventions (MBSR) and yoga, are based on systematic reviews and pilot studies published between 2012 and 2022. The strength of evidence in this area is moderate – which has been clearly indicated in the article text.
16. Detailed discussion of natural methods for lowering cortisol: How to naturally lower cortisol? Diet, herbs, supplements, and lifestyle. Żywioł Zdrowia Blog.