We use essential cookies (authentication, your saved goals/stack) by default. With your permission we’ll also enable privacy-respecting analytics (Vercel Web Analytics, anonymous load-time metrics) and error-replay diagnostics (Sentry — DOM snapshots only when an error fires) so we can fix bugs faster. Learn more about cookies
Myo-Inositol
Vitamin-like compound studied for hormonal and metabolic balance. Best evidence is for PCOS and gestational-diabetes prevention (multiple meta-analyses, though recent high-quality trials are mixed); anxiety/OCD data are older and thinner.
What the evidence says
Studies are split: Inositol helped in 3 of 7 cases, with the rest inconclusive or showing no benefit.
Most evidence is from high-quality meta-analyses and randomised trials published 1986–2026 with a typical study size of 612 participants.
Based on 180 studies · 42 meta-analyses · 100 RCTs · 39,240 total participants
Confidence
High confidenceWhat the studies found
By outcome
Many meta-analyses support myo-inositol for PCOS menstrual/metabolic outcomes and gestational-diabetes prevention, but a 2024 guideline review called the PCOS evidence inconclusive and a 2025 JAMA RCT was null, capping it short of top-tier.
111 randomised trials
every one checked individually
Every randomised or controlled trial of Inositol indexed in PubMed, not a hand-picked subset. Meta-analyses and systematic reviews are deliberately excluded from this count: most of them cover many compounds at once, so counting them would inflate it.
PubMed · as of Jul 2026
29 trials ongoing or recruiting · 120 completed on ClinicalTrials.gov
13 of the completed trials have posted results
Registered trials show research momentum for Inositol, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Under EU law (Reg. 1924/2006), EFSA reviews whether a specific health claim for Inositol meets the evidence standard. These are independent regulatory decisions on claims — not studies, and never counted toward the evidence score above.
Not authorised by EFSA
“Inositol Important for the function of the nervous system”
“Inositol Contributes to mental performance Contributes to mental concentration”
“Vitamine B8 : Vitamin B8 or vitamin H (biotin) Contribute to improve nail's resistance”
“Not authorised” means the specific claim wording did not meet the EU’s evidence standard — often a matter of dossier or phrasing, not proof of no effect. EFSA judges marketing claims and is kept separate from our study-based evidence score.
Source: EU Register of nutrition and health claims (European Commission / EFSA) · register snapshot Feb 2013
Inositol is a carbocyclic sugar found naturally in the body and in foods, where it plays key roles in cell signalling — particularly the insulin and serotonin pathways — as well as in cell-membrane formation. Myo-inositol is its most abundant form in the body and the one most of the research uses.
It is best studied in PCOS (polycystic ovary syndrome), where it improves insulin sensitivity, ovulation and hormone balance, typically in a 40:1 ratio with D-chiro-inositol.
Beyond reproductive health it shows benefits for anxiety, panic disorder and OCD through its effects on serotonin signalling, and in one 20-person crossover trial in panic disorder anxiety scores improved on both inositol and fluvoxamine with no reported difference, while inositol cut panic attacks more in the first month and caused less nausea and tiredness.
Supports serotonin receptor function and enhances receptor sensitivity
Supports insulin sensitivity
Critical for cellular communication
Supports healthy egg development and ovulation
How 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.
Used in PCOS fertility treatment. Pregnancy trials were too small to show safety for the baby (Cochrane, very low-certainty evidence), and adequate safety data in breastfeeding are lacking.
Use with caution; may trigger manic episodes
Often used for gestational diabetes prevention; consult healthcare provider
First-line natural treatment; well-studied
May have additive serotonin effects; often combined safely under supervision
Lithium may reduce inositol levels; supplementation may be beneficial
May enhance blood sugar lowering; monitor glucose
Tip: Start low and increase gradually; take with food
Tip: Reduce dose
Tip: Usually resolves with continued use
Inositol has an evidence score of 7/10 — strong evidence based on 181 indexed studies, including 21 meta-analyses. Vitamin-like compound studied for hormonal and metabolic balance. Best evidence is for PCOS and gestational-diabetes prevention (multiple meta-analyses, though recent high-quality trials are mixed); anxiety/OCD data are older and thinner. Representative study: PMID 40611279.
The commonly studied dose of Inositol is 2-4g for general anxiety; 12-18g for OCD/panic. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
Timing is flexible for Inositol — consistent daily use matters more than the time of day. Inositol (particularly myo-inositol) functions as a second messenger in insulin signaling, serotonin receptor function, and phospholipid metabolism.
Inositol is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are nausea, diarrhea, headache. Use caution if any of these apply to you: Bipolar disorder (may trigger mania at high doses).
Magnesium
Mixed evidenceSupports 300+ enzymatic reactions — critical for sleep, stress response, muscle function, and cognitive health.
Ashwagandha
Likely helpsReduces cortisol and anxiety while improving sleep quality and physical recovery in stressed adults.
Vitamin D3
Probably helpsHormone-like vitamin that regulates 1,000+ genes — deficiency is widespread and linked to poor immunity, depression, and bone loss.
Methylfolate
Likely helpsBioactive folate that bypasses MTHFR conversion — critical for the 30-40% of people with gene variants affecting mood and methylation.
Blood Sugar & Prediabetes
Berberine, inositol, magnesium vs the cinnamon/chromium hype — and the med-interaction warning.
Thyroid Support
Selenium helps; iodine can WORSEN Hashimoto’s. The honest take on "thyroid support".
Female Fertility & TTC
Folate is essential; inositol + CoQ10 are the best bets — but conception evidence is limited.
Supplements for PCOS
Inositol (40:1), and the supporting cast for insulin resistance, cycles & fertility.
Explore: Best supplements for Women's HealthBest supplements for Men's HealthBest supplements for Focus, Memory & MoodBest supplements for Vitality & LongevityBest supplements for Athletic PerformanceBest supplements for Sleep
Reviewed by Dr. Baher Al Hakim · Last reviewed May 2026 · evidence from 183 studies · how we score · editorial policy
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.
Tap node to isolate • Pinch to zoom • Tap edge for research