Myo-Inositol
Also known as: inositol, myo-inositol, MI, cyclohexanehexol, vitamin B8 (informal)
Effective Dosage
2000-4000 mg daily based on study doses
What the Science Says
Myo-inositol is a naturally occurring sugar alcohol found in foods like fruits, beans, and grains that acts as a cellular messenger involved in insulin signaling. In women with PCOS, it helps improve insulin sensitivity and may reduce levels of metabolic markers linked to hormonal dysfunction. An umbrella meta-analysis of nearly 18,000 participants found inositol supplementation cut gestational diabetes risk by roughly 58% and reduced rates of preterm birth, pregnancy-induced hypertension, and need for insulin therapy. Early research also suggests it may reduce inflammation in the uterine lining and support egg quality in women undergoing fertility treatments.
What It Doesn't Do
Not a proven weight-loss supplement. Won't replace metformin or other diabetes medications on its own. No strong evidence it benefits people without PCOS or metabolic issues. Anti-inflammatory effects in immune cells are only from lab studies — not proven in humans yet. The thyroid cancer application is still in early trial design phase with no clinical results. Don't expect it to work for general 'hormone balance' without an underlying insulin-related condition.
Evidence-Based Benefits
Myo-inositol is a naturally occurring sugar alcohol found in foods like fruits, beans, and grains that acts as a cellular messenger involved in insulin signaling. In women with PCOS, it helps improve insulin sensitivity and may reduce levels of metabolic markers linked to hormonal dysfunction. An umbrella meta-analysis of nearly 18,000 participants found inositol supplementation cut gestational diabetes risk by roughly 58% and reduced rates of preterm birth, pregnancy-induced hypertension, and need for insulin therapy. Early research also suggests it may reduce inflammation in the uterine lining and support egg quality in women undergoing fertility treatments.
Moderate EvidenceEffective at: 2000-4000 mg daily based on study doses
Source: auto-research
Absorption & Bioavailability
Good — myo-inositol is well absorbed orally and is naturally produced by the body. It crosses into tissues including the brain (detectable via MRS imaging) and reproductive organs. No major absorption issues reported in the provided studies.
Red Flags to Watch For
- Most strong evidence is specific to pregnant women and PCOS patients — benefits may not apply to the general population
- Many studies are small pilot trials (as few as 30-60 participants), limiting confidence in effect sizes
- Some studies combine myo-inositol with D-chiro-inositol or alpha-lipoic acid, making it hard to isolate myo-inositol's effects alone
- Anti-inflammatory and liver-protective findings are largely from animal models or cell studies — not yet confirmed in human trials
- Over 1,000 supplement products on the market use widely varying doses and formulations with little standardization
Products Containing Myo-Inositol
See how Myo-Inositol is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-08