Last verified: 44 days ago
Inositol
Also known as: myo-inositol, D-chiro-inositol, MI, DCI, inositol hexaphosphate
Evidence under review. — Not yet rated
Natural compound shown to improve insulin sensitivity, support PCOS, and reduce pregnancy complications.
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What it does
Inositol is a naturally occurring sugar alcohol found in the body that acts as a cellular messenger, helping regulate insulin signaling and hormone balance. Clinical trials show it can improve...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
2000-4000 mg daily based on study doses
What the Science Says
Inositol is a naturally occurring sugar alcohol found in the body that acts as a cellular messenger, helping regulate insulin signaling and hormone balance. Clinical trials show it can improve insulin resistance in women with PCOS, reduce markers of metabolic dysfunction, and lower the risk of preterm birth and preeclampsia in overweight or obese pregnant women. Studies used doses of 2000 mg twice daily, typically over 6–16 weeks, with measurable effects on blood sugar markers and reproductive outcomes.
What It Doesn't Do
Not a proven treatment for thyroid cancer on its own — the thyroid research is still in early pilot stages. Won't replace metformin for diabetes management. No strong evidence it improves general fertility in women without PCOS. The liver-protection and fatty liver benefits are from animal studies only — not proven in humans yet.
Evidence-Based Benefits
Inositol is a naturally occurring sugar alcohol found in the body that acts as a cellular messenger, helping regulate insulin signaling and hormone balance. Clinical trials show it can improve insulin resistance in women with PCOS, reduce markers of metabolic dysfunction, and lower the risk of preterm birth and preeclampsia in overweight or obese pregnant women. Studies used doses of 2000 mg twice daily, typically over 6–16 weeks, with measurable effects on blood sugar markers and reproductive outcomes.
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 synthesized in the body; pharmacokinetic data from preclinical models suggests efficient tissue distribution, though human pharmacokinetic studies are limited in the provided papers
Red Flags to Watch For
- Most clinical trials in the provided studies are small pilot studies (30–60 participants), limiting confidence in effect sizes
- Combining myo-inositol with metformin or other insulin-sensitizing drugs without medical supervision may cause additive blood sugar lowering
- Thyroid cancer application (re-differentiation therapy) is experimental and should not be self-administered
- Probiotic co-supplementation in pregnancy was associated with increased preterm birth risk in the same meta-analysis — be cautious about stacking supplements during pregnancy
Products Containing Inositol
See how Inositol is used in these analyzed products:
Life Extension Two-Per-Day Multivitamin
Supplement
Purolabs Pregnancy Complex
Supplement
Wholesome Story Inositol (Myo-Inositol)
Supplement
Life Extension Mix Capsules
Supplement
Ovasitol Plus
Supplement
Asquarednutrition
Supplement
ADAM™ Men's Multiple Vitamin
Supplement
Performance Lab B-Complex
Supplement
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