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Myo-Inositol
First-line natural treatment for PCOS that improves insulin sensitivity and ovulation — also reduces anxiety, panic, and OCD symptoms.
What the evidence says
Myo-Inositol appears to help in 7 of 9 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 1995–2025 with a typical study size of 692 participants.
Based on 36 studies · 21 meta-analyses · 13 RCTs · 41,038 total participants
Confidence
HighWhat the studies found
By outcome
See full supplement plans that include Myo-Inositol.
Myo-Inositol has an evidence score of 9/10 — very strong evidence based on 35 indexed studies, including 20 meta-analyses. First-line natural treatment for PCOS that improves insulin sensitivity and ovulation — also reduces anxiety, panic, and OCD symptoms.
The commonly studied dose of Myo-Inositol is 2-4g daily for PCOS; up to 12-18g for anxiety. Research points to an estimated optimal dose around 4000mg, with a minimum effective dose near 2000mg. Individual response varies — start low and adjust.
Timing is flexible for Myo-Inositol — consistent daily use matters more than the time of day. Myo-inositol is a sugar alcohol that serves as a second messenger in insulin signaling and is a precursor to phosphatidylinositol in cell membranes.
Last reviewed May 2026 · evidence from 39 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Myo-Inositol is the most abundant form of inositol in the body, playing crucial roles in insulin signaling, cell membrane formation, and neurotransmitter function. It has become a first-line natural treatment for PCOS (polycystic ovary syndrome), improving insulin sensitivity, ovulation, and hormone balance. Beyond reproductive health, inositol shows significant benefits for anxiety, panic disorder, and OCD through its effects on serotonin signaling.
Acts as a second messenger in insulin pathways
Enhances serotonin receptor sensitivity
Supports healthy egg development and ovulation
How Myo-Inositol works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
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2-4g daily for PCOS; up to 12-18g for anxiety
Loading: Start with 2g and increase gradually. PCOS typically uses 2-4g; anxiety disorders may use 12-18g.
Take with food
| Form | Type |
|---|---|
| 🧪Myo-inositol powder | Recommended |
| 💊Capsules | Alternative |
| 💊Myo-inositol + D-chiro-inositol combinations | Alternative |
Powder is most cost-effective for higher doses. 40:1 ratio of myo to D-chiro-inositol mimics natural physiological ratio and is often used for PCOS.
Minimum: 8 weeks
Optimal: 24 weeks
Cycling: Not required
Note: Often combined with D-chiro-inositol in 40:1 ratio for PCOS. For anxiety, higher doses divided throughout the day.
Based on multiple meta-analyses showing improved menstrual regularity and ovulation in PCOS. Evidence quality varies across studies with some showing minimal differences vs placebo. 4g daily most commonly studied dose.
More regular menstrual cycles and ovulation
Decreased anxiety and panic symptoms
Improved blood sugar regulation
May cause nausea or diarrhea at high doses
Often used for gestational diabetes prevention; consult healthcare provider
First-line natural treatment; well-studied
Lithium depletes inositol; supplementation may help but consult psychiatrist
May enhance blood sugar lowering; monitor glucose
Tip: Take with food; start with lower dose
Tip: Reduce dose; divide doses throughout day
Often combined for fertility support
Enhanced reproductive health and egg quality
Myo-inositol improves insulin sensitivity in PCOS while spearmint reduces androgens; together they address both metabolic and androgenic components of PCOS
Comprehensive PCOS management targeting insulin resistance and androgen excess
Myo-Inositol is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are nausea, diarrhea. Use caution if any of these apply to you: Bipolar disorder (may trigger mania at high doses).
Ashwagandha
Likely helpsReduces cortisol and anxiety while improving sleep quality and physical recovery in stressed adults.