Skip to main content
Supplement ScienceSupplementScience

Myo-Inositol Side Effects & Safety

Evidence:Strong
·

This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Safety Profile

Overall safety rating: Generally Safe

Potential Side Effects

  • Mild GI symptoms — nausea, gas, bloating, or loose stools at higher doses (most common, usually transient)
  • Headache (uncommon)
  • Dizziness (rare)
  • Very well-tolerated overall — side effect profile is significantly milder than metformin

Drug & Supplement Interactions

  • Metformin — additive insulin-sensitizing effects; combination may be used under medical supervision but monitor for hypoglycemia
  • Insulin and oral diabetic medications — potential additive hypoglycemic effects; adjust doses as needed with physician
  • Lithium — inositol depletion is part of lithium's mechanism; high-dose inositol may theoretically interfere; consult psychiatrist

Maximum Dose

Do not exceed: 4g daily is the standard therapeutic dose; doses up to 12g have been studied for other conditions (OCD, panic disorder) but are not standard for PCOS

Full Myo-Inositol Guide

References

  1. Meta-analysisUnfer V, Carlomagno G, Dante G, Facchinetti F (2012). Effects of myo-inositol in women with PCOS: a systematic review of randomized controlled trials. Gynecological Endocrinology. DOI PubMed
  2. Facchinetti F, Bizzarri M, Benvenga S, et al. (2015). Results from the International Consensus Conference on Myo-inositol and D-chiro-inositol in Obstetrics and Gynecology. Gynecological Endocrinology. DOI PubMed
  3. RCTGerli S, Papaleo E, Ferrari A, Di Renzo GC (2007). 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. PubMed
  4. Meta-analysisZhang J, Zhang H, Zhou W, Jiang M, et al. (2025). Effect of myo-inositol supplementation in mixed ovarian response IVF cohort: a systematic review and meta-analysis.. Frontiers in endocrinology. DOI PubMed
  5. Pivazyan L, Krylova E, Obosyan L, Seregina V, et al. (2025). Effectiveness of Myo-Inositol on Oocyte and Embryo Quality in Assisted Reproduction: Systematic Review and Meta-Analysis of Randomized Clinical Trials.. Gynecologic and obstetric investigation. DOI PubMed
  6. Chen H, Xiong J, Li Z, Chen Y, et al. (2024). Influence of myo-inositol on metabolic status for gestational diabetes: a meta-analysis of randomized controlled trials.. The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians. DOI PubMed
  7. Smucny J, Carter CS, Maddock RJ (2024). Greater Choline-Containing Compounds and Myo-inositol in Treatment-Resistant Versus Responsive Schizophrenia: A 1H-Magnetic Resonance Spectroscopy Meta-analysis.. Biological psychiatry. Cognitive neuroscience and neuroimaging. DOI PubMed
Show 5 more references
  1. Yavari M, Akbari M, Ramezani Ahmadi A, Siavash Dastjerdi M, et al. (2024). Investigating the effect of combined use of selenium and Myo-inositol supplements on thyroid function and autoimmune characteristics in thyroid disorders: a systematic review and meta-analysis.. Expert review of endocrinology & metabolism. DOI PubMed
  2. Meta-analysisFatima K, Jamil Z, Faheem S, Adnan A, et al. (2023). Effects of myo-inositol vs. metformin on hormonal and metabolic parameters in women with PCOS: a meta-analysis.. Irish journal of medical science. DOI PubMed
  3. Motuhifonua SK, Lin L, Alsweiler J, Crawford TJ, et al. (2023). Antenatal dietary supplementation with myo-inositol for preventing gestational diabetes.. The Cochrane database of systematic reviews. DOI PubMed
  4. Factor PA, Corpuz H (2023). The Efficacy and Safety of Myo-inositol Supplementation for the Prevention of Gestational Diabetes Mellitus in Overweight and Obese Pregnant Women: A Systematic Review and Meta-Analysis.. Journal of the ASEAN Federation of Endocrine Societies. DOI PubMed
  5. Meta-analysisLi L, Fang J (2022). Myo-inositol supplementation for the prevention of gestational diabetes: A meta-analysis of randomized controlled trials.. European journal of obstetrics, gynecology, and reproductive biology. DOI PubMed