Inositol
Also known as inositol, myo-inositol, vitamin b8
Key takeaways
- Inositol is effective for PCOS management and assisted reproduction, often used as an alternative or adjunct to metformin (PMID: 36285403).
- A 40:1 myo-inositol to D-chiro-inositol ratio is effective in restoring ovulation in PCOS patients (PMID: 31298405).
- Meta-analysis indicates higher levels of myo-inositol are associated with treatment-resistant schizophrenia (PMID: 37925074).
What the research shows
AI-synthesized from 32 peer-reviewed sources · Updated 2025
Inositol, particularly myo-inositol, is a sugar alcohol that acts as an insulin sensitizer. Research indicates it is most effective in managing metabolic and hormonal imbalances, particularly in women with Polycystic Ovary Syndrome (PCOS).
By condition
Polycystic Ovary Syndrome (PCOS)
Strong
Strong evidence supports its use in restoring ovulation, improving metabolic parameters, and managing hormonal imbalances, often performing comparably to metformin.
Gestational Diabetes
Moderate
Evidence suggests myo-inositol may help prevent gestational diabetes, particularly in overweight women.
Thyroid Disorders
Weak
Some evidence suggests potential benefits for thyroid function and autoimmune characteristics when combined with selenium.
Metabolic Syndrome/NAFLD
Weak
Preliminary evidence indicates it may improve metabolic profiles and liver function in obese patients.
Effective doses
Specific dose ranges were not explicitly detailed in the provided abstracts, though it is frequently compared to metformin in PCOS clinical trials.
Safety & interactions
No specific contraindications provided in the source text; generally used as an insulin sensitizer.
Limitations
While PCOS evidence is robust, other applications like thyroid health and NAFLD have smaller sample sizes and require more high-quality RCTs. Some meta-analyses for subfertility report limited data (N=13).
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Research evidence
Showing top 10 of 32 sources, sorted by quality
**Smucny et al., 2024** | Biol Psychiatry Cogn Neurosci Neuroimaging | Meta Analysis Smucny Jason, Carter Cameron S, Maddock Richard J. Greater Choline-Containing Compounds and Myo-inositol in Treatment-Resistant Versus Responsive Schizophr…
**Fitz et al., 2024** | J Clin Endocrinol Metab | Meta Analysis Fitz Victoria, Graca Sandro, ... Ee Carolyn. Inositol for Polycystic Ovary Syndrome: A Systematic Review and Meta-analysis to Inform the 2023 Update of the International Eviden…
BACKGROUND: Gestational diabetes with onset or first recognition during pregnancy is an increasing problem worldwide. Myo-inositol, an isomer of inositol, is a naturally occurring sugar commonly found in cereals, corn, legumes and meat. Myo…
**Unanyan et al., 2022** | Gynecol Endocrinol | Meta Analysis Unanyan Ara, Pivazyan Laura, ... Ishchenko Anatoly. Effectiveness of inositol, metformin and their combination in women with PCOS undergoing assisted reproduction: systematic rev…
**Fatima et al., 2023** | Ir J Med Sci | Meta Analysis Fatima Kaneez, Jamil Zainab, ... Ochani Sidhant. Effects of myo-inositol vs. metformin on hormonal and metabolic parameters in women with PCOS: a meta-analysis. Ir J Med Sci. 2023-Dec;1…
**Showell et al., 2018** | Cochrane Database Syst Rev | Meta Analysis Showell Marian G, Mackenzie-Proctor Rebecca, ... Farquhar Cindy. Inositol for subfertile women with polycystic ovary syndrome. Cochrane Database Syst Rev. 2018-Dec-20;12(…
**Pkhaladze et al., 2021** | Eur Rev Med Pharmacol Sci | Rct Pkhaladze L, Russo M, ... Khomasuridze A. Treatment of lean PCOS teenagers: a follow-up comparison between Myo-Inositol and oral contraceptives. Eur Rev Med Pharmacol Sci. 2021-De…
**Nordio et al., 2019** | Eur Rev Med Pharmacol Sci | Rct Nordio M, Basciani S, Camajani E. The 40:1 myo-inositol/D-chiro-inositol plasma ratio is able to restore ovulation in PCOS patients: comparison with other ratios. Eur Rev Med Pharmac…
BACKGROUND: This study aimed to systematically review the effect of selenium and inositol combination on thyroid function, autoimmune characteristics in thyroid diseases. RESEARCH DESIGN AND METHODS: To identify eligible studies, a systemat…
This study aims to evaluate the effects of myo-inositol supplementation on gestational diabetes mellitus (GDM) rates and body water distribution in overweight non-obese women. 223 overweight non-obese women pregnant were randomly assigned t…
Frequently asked questions
What is Inositol and what is it used for?
Inositol, particularly myo-inositol, is a sugar alcohol that acts as an insulin sensitizer. It is primarily used to manage metabolic and hormonal imbalances, with the strongest evidence supporting its use for women with Polycystic Ovary Syndrome (PCOS).
Does Inositol work for PCOS?
Yes, there is strong evidence that Inositol helps restore ovulation, improve metabolic parameters, and manage hormonal imbalances in women with PCOS. Research indicates it often performs comparably to the medication metformin in clinical trials.
Can Inositol help prevent gestational diabetes?
There is moderate evidence suggesting that myo-inositol may help prevent gestational diabetes, particularly in overweight women. However, you should consult your healthcare provider before using it during pregnancy to ensure it is appropriate for your specific situation.
What is the effective dose of Inositol?
The provided evidence does not explicitly detail specific dose ranges, though it is frequently compared to metformin in PCOS clinical trials. One study noted a 40:1 myo-inositol to D-chiro-inositol ratio was effective for restoring ovulation. Please consult a healthcare provider for personalized dosing advice.
Is Inositol safe to take with other medications?
No drug interactions have been documented for Inositol in the provided sources. It is generally used as an insulin sensitizer with no specific contraindications listed, but you should always consult your healthcare provider before starting any new supplement, especially if you are on other medications.
Does Inositol help with thyroid disorders?
The evidence for Inositol's effect on thyroid disorders is weak. Some preliminary data suggests potential benefits for thyroid function and autoimmune characteristics when combined with selenium, but research is limited. You should not rely on it as a primary treatment without medical guidance.
Who should avoid taking Inositol?
While no specific contraindications are provided, individuals with treatment-resistant schizophrenia may need to avoid high levels of myo-inositol due to mixed evidence linking higher levels to this condition. Pregnant women and those with metabolic conditions should consult a healthcare provider before use.