Do you find yourself scrolling through endless forums, wondering whether inositol, berberine or omega-3 supplements could help with PCOS symptoms? I hear that question often in my online consultations, and the good news is that the research is growing — though it comes with important caveats.
Polycystic ovary syndrome (PCOS) is a hormonal condition affecting roughly 1 in 10 women of reproductive age in the UK, according to NHS data. It can bring irregular periods, unwanted facial hair, acne and challenges with fertility. While lifestyle changes — a balanced diet, regular movement and stress management — remain the cornerstone of care, many clients ask about supplements they have seen discussed online.
In this post I will summarise what the evidence currently says about three widely discussed supplements. This is educational information, not a recommendation to take any specific product or dose. Supplements can interact with medications and affect people differently, so always
Inositol: what the research shows
Inositol is a naturally occurring compound found in foods such as beans, citrus fruit and whole grains. Two forms — myo-inositol (MI) and D-chiro-inositol (DCI) — have been studied in women with PCOS.
Several clinical trials have reported that inositol supplementation may improve insulin sensitivity, support ovarian function and help regulate menstrual cycles in some women with PCOS. A systematic review published in the Journal of Clinical Endocrinology & Metabolism found positive effects on fasting insulin and testosterone levels, though the authors noted that study sizes were small and more research is needed.
Food sources of inositol — such as chickpeas, lentils, oats and citrus — can be included as part of a balanced PCOS-friendly diet, which is something I can help you with in a consultation.
Berberine: promising but requires medical oversight
Berberine is a plant-derived compound that has attracted attention for its potential effects on blood sugar regulation. Some researchers have compared its mechanism of action to metformin, a medication commonly prescribed for insulin resistance.
Early-stage studies in women with PCOS suggest berberine may support glucose metabolism and lipid profiles. However, berberine can interact with a number of medications, including blood thinners and some antibiotics, and its long-term safety profile is not yet fully established. If you are interested in berberine, raise it at your next medical appointment so your doctor can assess whether it is appropriate alongside your current treatment.
Omega-3 fatty acids: the anti-inflammatory angle
Long-chain omega-3 fatty acids (EPA and DHA) are well established for their anti-inflammatory properties. In the context of PCOS, some studies have found modest improvements in lipid profiles and markers of inflammation when omega-3 intake is increased.
The good news is that you do not necessarily need a supplement to benefit. The NHS recommends eating at least two portions of fish per week, including one of oily fish such as salmon, mackerel or sardines. For vegetarians, flaxseed, chia seeds, walnuts and algae-based sources provide plant-derived omega-3s.
In my practice, I focus on helping clients build omega-3-rich meals into their weekly routine — which is often more sustainable and enjoyable than taking capsules.
A food-first approach
While supplements can play a supporting role, they work best alongside — not instead of — a balanced diet. Some practical, food-first steps you can take today:
- Include inositol-rich foods like chickpeas, lentils and oats regularly.
- Aim for two portions of oily fish per week, or add flaxseed and walnuts to breakfasts and salads.
- Choose low-glycaemic carbohydrates (whole grains, legumes, non-starchy vegetables) to support blood sugar stability.
- Pair carbohydrates with protein and healthy fats at each meal to slow glucose absorption.
- Keep a food diary for a week to identify patterns — this is something we can review together in a consultation.
These dietary foundations align with NICE guidance and can make a meaningful difference whether or not you also use supplements. your GP can advise on clinical supplement protocols and monitor your response alongside blood tests. As a registered nutritionist, I can support you with the dietary side — helping you build balanced, hormone-friendly meals and sustainable habits that complement any clinical care you are receiving.
If you are also dealing with related concerns such as weight management, gut health or insulin resistance, you may find my weight loss and gut health resources useful. For a deeper dive into PCOS-specific nutrition, see my PCOS nutrition guide.
Ready to explore how diet can support your PCOS alongside any supplements your GP has recommended? Visit my services page or get in touch via contact to book a personalised consultation.