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Head-to-head evidence comparison — which supplement is right for you?
Inositol vs Melatonin: Melatonin has the stronger overall evidence (8.5 vs 7/10); they're alternatives for fall asleep faster — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Melatonin wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Probably helps
11 of 18 studies with measurable effects showed benefit.
Top outcomes
Verdict
Likely helps
13 of 18 studies with measurable effects showed benefit.
Top outcomes
2-4g for general anxiety; 12-18g for OCD/panic
Divided into 2-3 doses, With or without food
Myo-inositol powder (most economical for higher doses)
0.5-1mg
30-60 minutes before bed
Immediate-release tablet or sublingual
and 6 more not shown
4-6 weeks
6-12 weeks
3-6 months
First 1-2 weeks
Same night
1-3 days
Next morning
First week
Antenatal dietary supplementation with myo-inositol for preventing gestational diabetes
The Cochrane database of systematic reviews (2023) · Meta analysis · n=1319
For the primary neonatal outcomes, only one study measured the risk of a large-for-gestational-age infant and found myo-inositol was associated with both appreciable benefit and harm (RR 1.40, 95% CI 0.65 to 3.02; 1 study, 234 infants; low-certainty evidence).
Inositol Nutritional Supplementation for the Prevention of Gestational Diabetes Mellitus: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Nutrients (2022) · Meta analysis · n=1321
Pooled results were expressed as relative risk (RR) or mean difference (MD) with a 95% confidence interval (95% CI).
Antioxidants for female subfertility
The Cochrane database of systematic reviews (2020) · Meta analysis · n=7760
Due to the very low-quality of the evidence we are uncertain whether antioxidants improve live birth rate compared with placebo or no treatment/standard treatment (odds ratio (OR) 1.81, 95% confidence interval (CI) 1.36 to 2.43; P < 0.001, I2 = 29%; 13 RCTs, 1227 women).
Melatonin in cancer treatment
The Cochrane database of systematic reviews (2025) · Meta analysis · n=126
We downgraded the certainty of the evidence because of high risk of bias, small sample size, the width of the 95% confidence interval, and indirectness due to inadequate reporting of cancer type.
Comparative Efficacy, Tolerability, and Acceptability of Donanemab, Lecanemab, Aducanumab, Melatonin, and Aerobic Exercise for a Short Time on Cognitive Function in Mild Cognitive Impairment and Mild Alzheimer's Disease: A Systematic Review and Network Meta-Analysis
Journal of Alzheimer's disease : JAD (2024) · Meta analysis · n=4599
Melatonin may be a better potential disease-modifying treatment for cognitive decline in mild AD and MCI.
Melatonin for sleep disorders in people with autism: Systematic review and meta-analysis
Progress in neuro-psychopharmacology & biological psychiatry (2023) · Meta analysis · n=595
According to the global analysis, the wake after sleep onset and night awakening parameters were not statistically significant.
Based on multiple meta-analyses showing inositol benefits for PCOS including improved menstrual regularity, hormonal parameters, and metabolic markers. Evidence quality varies across studies with some limitations noted in systematic reviews.
Based on meta-analyses showing 7-12 minute reduction in sleep onset. Higher doses showed diminishing returns and increased morning grogginess. Sublingual forms may be more effective at lower doses.
AI-estimated from published studies. Interpret as directional guidance.
Melatonin has a higher evidence score (8.5/10 vs 7/10) and wins in 2 of 3 categories.
For fall asleep faster, Melatonin has a higher relevance score (95 vs 60).
No known interactions between Inositol and Melatonin have been documented in our database. However, always consult a healthcare provider before combining supplements.
Berberine, inositol, magnesium vs the cinnamon/chromium hype — and the med-interaction warning.
Selenium helps; iodine can WORSEN Hashimoto’s. The honest take on "thyroid support".
Folate is essential; inositol + CoQ10 are the best bets — but conception evidence is limited.
Inositol (40:1), and the supporting cast for insulin resistance, cycles & fertility.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.