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Benefits of Myo-Inositol

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Evidence-Based Benefits

  • Insulin sensitization — Unfer et al. (2012) meta-analysis confirmed that myo-inositol at 4g daily significantly improved HOMA-IR, fasting insulin, and glucose disposal in women with PCOS, with effects comparable to metformin in some head-to-head trials
  • Androgen reduction — by improving insulin signaling, myo-inositol reduces insulin-driven ovarian androgen production; multiple RCTs show significant decreases in total testosterone and free androgen index
  • Ovulation restoration — Gerli et al. (2007) demonstrated that 4g of myo-inositol daily restored ovulation in 65% of anovulatory PCOS women over 14 weeks, compared to 50% with placebo
  • IVF oocyte quality — Ciotta et al. (2011) and others have shown that myo-inositol supplementation before IVF cycles improves oocyte maturity, reduces FSH required for stimulation, and may improve pregnancy rates
  • Metabolic improvements — improvements in lipid profiles (reduced LDL, triglycerides) and blood pressure have been observed in PCOS patients taking myo-inositol

What the Research Says

Myo-inositol has become one of the most evidence-based supplements for PCOS, with endorsement from the 2017 International Consensus Conference on myo-inositol and D-chiro-inositol in obstetrics and gynecology. Unfer et al. (2012) published a comprehensive meta-analysis showing significant improvements in insulin resistance, androgen levels, and ovulatory function. The 40:1 myo-inositol to D-chiro-inositol ratio, proposed by Nordio & Proietti (2012), reflects the physiological plasma ratio and has shown superior results to either isomer alone. Multiple head-to-head trials with metformin have shown comparable efficacy for insulin sensitization in PCOS with fewer side effects. The mechanism is well-understood: myo-inositol is an essential component of the insulin-signaling cascade via phosphatidylinositol 3-kinase (PI3K) pathway.

Related Conditions

PcosInsulin ResistanceInfertilityMetabolic Syndrome
Full Myo-Inositol Guide

References

  1. (). Effects of myo-inositol in women with PCOS: a systematic review of randomized controlled trials. Gynecological Endocrinology. DOI
  2. (). Results from the International Consensus Conference on Myo-inositol and D-chiro-inositol in Obstetrics and Gynecology. Gynecological Endocrinology. DOI
  3. (). Randomized, double blind placebo-controlled trial: effects of myo-inositol on ovarian function and metabolic factors in women with PCOS. European Review for Medical and Pharmacological Sciences.