Friends and enemies of PCOS
The Metabolic Reset: PCOS Through Anti-inflammatory and Antioxidant Nutrition
For many women living with Polycystic Ovary Syndrome (PCOS), the condition can feel like an inescapable cycle of metabolic and hormonal imbalance. Affecting an estimated 10–13% of women of reproductive age, PCOS is not simply a fertility issue - it is a complex endocrine disorder driven by a self-reinforcing loop of body fat, insulin resistance, and chronic inflammation. Clinical evidence suggests that strategic nutrition can serve as a primary metabolic reset by reducing the biological signals that perpetuate these symptoms.
The biological engine: why diet matters
To manage PCOS effectively, we must first understand the underlying biology. The condition is rooted in three interconnected drivers: disordered hormonal synthesis, insulin resistance (IR), and the influence of excess body fat, particularly in the abdominal region. The primary culprit is often hyperinsulinaemia, an excess of circulating insulin. Insulin acts synergistically with luteinising hormone (LH) to amplify androgen production in the ovaries, while simultaneously suppressing the liver's output of sex hormone-binding globulin (SHBG), leaving testosterone in its biologically active, unbound form. This hormonal surge further promotes weight gain, which worsens insulin sensitivity, creating a self-sustaining loop.
Inflammation and oxidative stress
Chronic low-grade inflammation is the accelerant in this metabolic fire. Diets high in simple sugars or saturated fats prompt the body to generate Reactive Oxygen Species (ROS): unstable molecules that trigger oxidative stress. This activates Nuclear Factor κB (NF-κB), a master inflammatory switch that drives production of pro-inflammatory cytokines such as TNF-α. These molecules directly disrupt insulin signalling, making cells progressively resistant to the hormone meant to regulate blood sugar, deepening the cycle further.Anti-inflammatory and antioxidant foods
The most effective dietary strategy is to minimise inflammatory triggers while emphasising foods that provide antioxidant protection:
- Low glycaemic index (LGI) and high-fibre foods — These prevent the sharp insulin spikes that drive androgen production. High-fibre diets also nourish gut microbiota, particularly Bifidobacteria, which produce short-chain fatty acids (SCFAs) that help regulate insulin secretion and stimulate satiety hormones such as PYY. Examples include: oats, lentils, chickpeas, sweet potatoes, barley, berries, leafy greens and quinoa.
- Targeted antioxidants — Plant-derived melatonin acts as a free radical scavenger, protecting ovarian follicles during maturation. Curcumin (the active compound in turmeric) has been shown in clinical studies to reduce oxidative stress and suppress the NF-κB inflammatory pathway in women with PCOS. Examples include: tart berries, walnuts, tomatoes, grapes, turmeric, curry powder, golden milk and dark chocolate (70+).
- Minimising saturated fat — Saturated fatty acid (SFA) intake directly stimulates elevated circulating TNF-α. Reducing SFA intake is considered essential for lowering systemic inflammation. Avoid the following foods: processed meats, full-fat dairy, fried foods, pastries and biscuits, excessive coconut oil and palm oil products.
Evidence-based supplements and herbs
Several nutraceuticals have now accumulated meaningful clinical trial data in PCOS. The most frequently investigated, ranked by volume of research, are inositols, vitamin D, N-acetylcysteine, and omega-3 fatty acids. Below is a summary of current evidence:
Myo-inositol (for Insulin sensitivity)
A naturally occurring compound found in fruits and vegetables, myo-inositol functions as a secondary messenger in the FSH signalling pathway. Clinical trials show it improves menstrual regularity and reduces HOMA-IR (a marker of insulin resistance), with a significantly lower side-effect burden than metformin. A 2023 systematic review and meta-analysis confirmed it is an effective and safe treatment for PCOS.
Greff D, Juhász AE, Váncsa S, Váradi A, Sipos Z, Szinte J, Park S, Hegyi P, Nyirády P, Ács N, Várbíró S, Horváth EM. Inositol is an effective and safe treatment in polycystic ovary syndrome: a systematic review and meta-analysis of randomized controlled trials. Reprod Biol Endocrinol. 2023 Jan 26;21(1):10. doi: 10.1186/s12958-023-01055-z. PMID: 36703143; PMCID: PMC9878965.
Ravn P, Gram F, Andersen MS, Glintborg D. Myoinositol vs. Metformin in Women with Polycystic Ovary Syndrome: A Randomized Controlled Clinical Trial. Metabolites. 2022 Nov 26;12(12):1183. doi: 10.3390/metabo12121183. PMID: 36557221; PMCID: PMC9786218.
Vitamin D (for hormonal balance)
Deficiency is highly prevalent in women with PCOS. Supplementation has been shown to improve insulin metabolism, increase total antioxidant capacity, reduce C-reactive protein (CRP), lower total serum testosterone, and regulate ovulation dysfunction — acting through the VDR and CYP27B1 gene pathways. Co-supplementation with calcium amplifies these benefits further.
Han Y, Hou Y, Han Q, Yuan X, Chen L. Dietary supplements in polycystic ovary syndrome-current evidence. Front Endocrinol (Lausanne). 2024 Sep 27;15:1456571. doi: 10.3389/fendo.2024.1456571. PMID: 39398335; PMCID: PMC11466749.
Ren X, Wu W, Li Q, Li W, Wang X, Wang G. Different supplements improve insulin resistance, hormonal functions, and oxidative stress on overweight and obese women with polycystic ovary syndrome: a systematic review and meta-analysis. Front Endocrinol (Lausanne). 2024 Dec 11;15:1464959. doi: 10.3389/fendo.2024.1464959. PMID: 39722805; PMCID: PMC11668966.
N-acetylcysteine (NAC) (For anti-oxidant properties and insulin resistance)
NAC is a precursor to glutathione, the body's primary endogenous antioxidant. Ranked among the top investigated supplements for PCOS, it has demonstrated improvements in insulin resistance, oxidative stress markers, and lipid profiles in overweight and obese women with PCOS. Typical studied doses range from 1,200–1,800 mg/day over 8–24 weeks.
Han Y, Hou Y, Han Q, Yuan X, Chen L. Dietary supplements in polycystic ovary syndrome-current evidence. Front Endocrinol (Lausanne). 2024 Sep 27;15:1456571. doi: 10.3389/fendo.2024.1456571. PMID: 39398335; PMCID: PMC11466749.
Ren X, Wu W, Li Q, Li W, Wang X, Wang G. Different supplements improve insulin resistance, hormonal functions, and oxidative stress on overweight and obese women with polycystic ovary syndrome: a systematic review and meta-analysis. Front Endocrinol (Lausanne). 2024 Dec 11;15:1464959. doi: 10.3389/fendo.2024.1464959. PMID: 39722805; PMCID: PMC11668966.
Omega-3 fatty acids (for lipids & inflammation)
EPA and DHA from fish oil reduce triglycerides, improve LDL-C profiles, and lower systemic inflammation. A 2025 umbrella meta-analysis highlighted omega-3s alongside myo-inositol and probiotics as offering the most clinically actionable evidence for PCOS management. Benefits are enhanced when combined with vitamin E.
Wang R, Huang K, Wang M, Zou W, Huang Y, Jiang W, Feng Y, Shen H, Lei X. Efficacy of dietary supplements as an adjunctive therapy for polycystic ovary syndrome: an umbrella meta-analysis. Front Nutr. 2025 Oct 29;12:1705284. doi: 10.3389/fnut.2025.1705284. PMID: 41235304; PMCID: PMC12605168.
Coenzyme Q10 (CoQ10) (for mitochondrial support)
CoQ10 supports mitochondrial energy production and acts as a potent intracellular antioxidant. Evidence from RCTs indicates it further improves insulin sensitivity and reduces oxidative stress markers in PCOS, particularly at doses of 100–200 mg/day taken with food. It is consistently listed among key nutraceuticals in recent systematic reviews.
Biomedicines 2023, 11(12), 3349; https://doi.org/10.3390/biomedicines11123349
Berberine (Emerging evidence)
An alkaloid extracted from plants such as barberry and goldenseal, berberine activates AMPK, a key enzyme in insulin signalling, the same pathway targeted by metformin. Emerging trial data suggest benefits for menstrual cycle regularity, androgens, and skin/hair symptoms, though larger trials and interaction screening are still needed before routine use.
Biomedicines 2023, 11(12), 3349; https://doi.org/10.3390/biomedicines11123349
Vitex agnus-castus (chasteberry) (for hormonal regulation)
One of the most studied herbal medicines for PCOS-related hormonal disruption, chasteberry has demonstrated reductions in LH, prolactin, and testosterone in clinical studies, along with improvements in menstrual regularity. It acts on dopamine receptors to modulate the hypothalamic-pituitary axis, reducing the excess LH that drives androgen overproduction.
Arentz, S., Abbott, J.A., Smith, C.A. et al. Herbal medicine for the management of polycystic ovary syndrome (PCOS) and associated oligo/amenorrhoea and hyperandrogenism; a review of the laboratory evidence for effects with corroborative clinical findings. BMC Complement Altern Med 14, 511 (2014). https://doi.org/10.1186/1472-6882-14-511
Manouchehri A, Abbaszadeh S, Ahmadi M, Nejad FK, Bahmani M, Dastyar N. Polycystic ovaries and herbal remedies: A systematic review. JBRA Assist Reprod. 2023 Mar 30;27(1):85-91. doi: 10.5935/1518-0557.20220024. PMID: 35916457; PMCID: PMC10065776.
Cinnamon (Cinnamomum cassia) (for glycaemic control)
Cinnamon extract has demonstrated insulin-sensitising properties in PCOS populations, improving fasting glucose and menstrual cycle frequency. Its active compounds appear to improve insulin receptor signalling, making it a practical dietary adjunct. It is one of the herbal interventions with the most consistent corroboration between laboratory and clinical findings.
Arentz, S., Abbott, J.A., Smith, C.A. et al. Herbal medicine for the management of polycystic ovary syndrome (PCOS) and associated oligo/amenorrhoea and hyperandrogenism; a review of the laboratory evidence for effects with corroborative clinical findings. BMC Complement Altern Med 14, 511 (2014). https://doi.org/10.1186/1472-6882-14-511
Manouchehri A, Abbaszadeh S, Ahmadi M, Nejad FK, Bahmani M, Dastyar N. Polycystic ovaries and herbal remedies: A systematic review. JBRA Assist Reprod. 2023 Mar 30;27(1):85-91. doi: 10.5935/1518-0557.20220024. PMID: 35916457; PMCID: PMC10065776.
Magnesium (for enzyme co-factor)
Magnesium is an intracellular cofactor for numerous enzymes involved in insulin metabolism. Low magnesium levels impair tyrosine-kinase activity at the insulin receptor, contributing to IR. Co-supplementation with magnesium, zinc, calcium, and vitamin D has been shown to improve insulin sensitivity and CRP levels together, suggesting a synergistic micronutrient approach may be more effective than single-nutrient protocols.
Alesi S, Ee C, Moran LJ, Rao V, Mousa A. Nutritional Supplements and Complementary Therapies in Polycystic Ovary Syndrome. Adv Nutr. 2022 Aug 1;13(4):1243-1266. doi: 10.1093/advances/nmab141. PMID: 34970669; PMCID: PMC9340985.
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. PCOS presentations vary significantly between individuals. Please consult a qualified healthcare professional before starting any supplementation protocol. Please note that supplementation should be personalised - individual deficiency status, metabolic phenotype, and drug interactions all matter.
Beyond the plate: movement and sleep
Nutrition works best when paired with restorative lifestyle habits. Vigorous physical exercise optimises glucose transport and directly counteracts insulin resistance. Studies in PCOS populations show it delivers the greatest improvements in cardiorespiratory fitness and body fat reduction. Sleep quality is equally important: sleep deprivation disrupts the appetite-regulating hormones ghrelin and leptin, increases gut permeability, and amplifies systemic inflammation, undermining the metabolic gains made through diet.
Written by Ines Jabir BSc RD MPH
The views expressed in this article are the author's own and do not necessarily reflect My Nutrition Balance's editorial stance. This blog should not be consulted for medical advice.