--- title: "Inositol for Women with PCOS/PMOS: What It Is and Why It Matters" entity: "blog" canonical_url: "https://www.dramytung.com/blog/inositol-supplements-for-pcos-what-the-science-says-about-hormone-balance-and-fertility" markdown_url: "https://www.dramytung.com/llms/blog/inositol-supplements-for-pcos-what-the-science-says-about-hormone-balance-and-fertility" lastmod: "2026-06-07T10:00:00.000Z" --- ## What is Inositol? Inositol is a naturally occurring sugar isomer, sometimes grouped with B vitamins. Inositol plays an important role in insulin signaling and glucose metabolism. For women with Polycystic Ovarian Syndrome (PCOS) - just [recently renamed Polyendocrine Metabolic Ovarian Syndrome (PMOS)](/blog/pcos-name-change-to-pmos-what-it-means-and-why-it-matters)specifically, inositol may be especially relevant because it can help improve [insulin sensitivity by supporting glucose uptake independently of insulin.](/blog/what-is-insulin-resistance-anyway) "Women with polycystic ovary syndrome (PCOS) have greater predisposition to obesity, but the mechanisms are still unknown. Hyperinsulinemia, insulin resistance and low levels of ghrelin are common in this group." (Jaipur et al, 2019) ## Is PCOS/PMOS an "Inositol deficiency"? In PCOS/PMOS, an “inositol deficiency” or altered inositol metabolism has been observed in tissues, which may contribute to insulin resistance and the typical hormonal imbalances of this condition. Research also suggests that altered inositol levels may be involved in the development of PCOS, making it a promising nutritional support option for managing symptoms and metabolic health. ### What are the forms of Inositol? There are two main forms: - Myoinositol (MYO) - D-chiro inositol (DCI) Both MYO and DCI act [intracellularly as insulin second messengers](/blog/myo-inositol-restoring-metabolic-balance-in-midlife-women). Myoinositol however is considered more important for ovarian function and fertility than DCI. Research has shown that inositol can provide multiple benefits for women with PCOS. Some products on the market have a combination of MYO and DCI in various ratios such as 40:1 ratio of MYO:DCI. Evidence on combination formulas is mixed. The research shows the most benefit comes from specifically the MYO. ## How does inositol work in Polycystic Ovarian Syndrome (PCOS) and Polyendocrine Metabolic Ovarian Syndrome (PMOS)? Women with PCOS often have insulin resistance which means that high insulin levels can worsen androgen excess, weight gain, and ovulatory dysfunction. By improving how cells respond to insulin, inositol can help support more stable blood sugar, lower insulin, and better hormone balance over time. Key evidence-based benefits include: - Inositol improves insulin sensitivity, reduces fasting insulin, and can help normalize glucose-insulin ratios, with positive changes reported in cholesterol, triglycerides, and blood pressure in many women with PCOS. - Studies show inositol can reduce circulating androgens (such as testosterone) and DHEA while supporting healthier levels of estradiol and progesterone, which may help with cycle regulation and symptoms like acne and excess hair growth. - Ovulation and menstrual regularity via myo‑inositol in particular which has been shown to improve ovulation frequency, restore more regular menstrual cycles, and enhance oocyte and embryo quality in women undergoing assisted reproductive technologies (ART). - Weight management was seen via enhanced insulin sensitivity and balanced blood sugar. Inositol may assist with weight loss efforts and reduce risk markers for cardiometabolic disease in some women with PCOS. "Polycystic ovary syndrome (PCOS) is a very common endocrine disorder characterized by chronic anovulation, clinical and/or biochemical hyperandrogenism, and/or polycystic ovaries." ## Inositol and fertility In fertility care, inositol is often used as a “pre‑stimulation” supplement in women with PCOS and sometimes in non‑PCOS patients as well. Clinical trials and meta-analyses have found: - Myo‑inositol prior to In-vitro fertilization (IVF) can reduce the total amount of gonadotropins needed and the length of ovarian stimulation, and may lower the risk of ovarian hyperstimulation syndrome in women with PCOS. - Because many protocols and doses exist, it is important to work with a healthcare provider experienced in both PCOS and fertility to choose an appropriate regimen for your specific situation. ## Safety concerns with Inositol From a clinical guideline perspective, inositol is considered a low-risk supplement that may be offered to women with PCOS for metabolic and reproductive support, based on individual preferences and shared decision-making. While promising, current research does not yet allow experts to definitively recommend one exact dose, ratio, or brand of inositol for all women with PCOS, and more high-quality trials are still needed. ## The role of Inositol combined with medications Medications such as metformin (a medication often used for the treatment of [type 2 diabetes](/blog/understanding-obesity-beyond-bmi-why-muscle-mass-and-belly-fat-matter-in-perimenopause)and for PCOS patients) is generally preferred when the primary treatment goal is hirsutism or central adiposity. "Metformin is the gold standard insulin sensitizer, which is widely used to treat insulin resistance in polycystic ovary syndrome (PCOS)." (Greff, 2023) When combined with therapies such as melatonin or metformin, inositol has been associated with better embryo quality, higher implantation and pregnancy rates, and improved live birth rates compared to standard treatment alone in several studies. ## Final thoughts around Inositol When choosing a supplement it is best to choose reputable brands and inform your healthcare provider about any products you are taking. Speak to your Naturopathic Doctor about the type and form that is best for you. If you are pregnant or planning pregnancy, always discuss inositol use with your prenatal care provider to ensure it is safe and appropriate for you. To your best health, Dr. Amy Tung, ND, MSCP Menopause Society Certified Practitioner References: Fitz, V., Graca S., et al. (2024) The Journal of Clinical Endocrinology & Metabolism. Inositol for Polycystic Ovary Syndrome: A Systematic Review and Meta-analysis to Inform the 2023 Update of the International Evidence-based PCOS Guidelines. Greff D., Juhász A., Váncsa S., et al. (2023) Reproductive Biology and Endocrinology. Inositol is an effective and safe treatment in polycystic ovary syndrome: a systematic review and meta-analysis of randomized controlled trials. Delavar, M. Mirabi, P., Rosenkranz, S., et al. (2025) Diabetology & Metabolic Syndrome. Inositol supplementation efficacy in improving key cardiometabolic and anthropometric indices: a GRADE-assessed systematic review and meta-analysis of randomized controlled trials. Baptiste, C., et al. (2010) The Journal of Steroid Biochemistry and Molecular Biology. Insulin and hyperandrogenism in women with polycystic ovary syndrome. ## Interested in learning more about working with me? Book a free discovery call virtually (Ontario residents only). Book Now