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Myo-Inositol Research & Evidence

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Evidence Level

Strong

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.

Evidence by Condition

ConditionStudied DoseEvidence
PCOS (insulin resistance, androgen excess)4g myo-inositol + 400mcg folic acid dailyStrong
PCOS with 40:1 D-chiro-inositol3.6g myo-inositol + 90mg D-chiro-inositol dailyStrong
IVF preparation4g myo-inositol daily starting 3 months before cycleModerate
Gestational diabetes prevention2-4g daily (under medical supervision)Moderate
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.