Best Myo-Inositol Supplements 2026: Cost per Effective Dose
Top pick for Myo-Inositol: Wholesome Story Myo-Inositol & D-Chiro Inositol 40:1 — 2050mg per 4 capsules, $0.93/day. Our best-value pick.
Registry check · Myo-Inositol
Does anyone independently verify Myo-Inositol supplements?
1 of these 3 products are confirmed in NSF/ANSI 173, which puts this category in the minority with any verified option at all. The other 2 are not listed anywhere we can check — not evidence against them, only an absence of independent confirmation.
Certification is not a dosing guarantee. Across the whole catalogue, certified products reach the clinically studied dose 57% of the time and uncertified ones 71% — a gap too small to mean anything (Fisher p = 0.185). Read the Myo-Inositol dose column either way.
3 checked against all 5,317 US NSF, USP and Informed Sport listings, 2026-08-25. Full method and limitations.
What 3 Myo-Inositol labels show
Priced per day, these myo-inositol products run $0.16 to $0.97 — a 6.1× gap between the cheapest and dearest myo-inositol here, across 3 brands.
Servings here are close enough to compare directly, so the gap is a real one: Micro Ingredients at $0.16 buys the same thing as Theralogix at $0.97.
All Myo-Inositol Supplements Compared
| Product | Brand | Dose / Serving | Cost / Day | Certification (as labelled) | Pick | Buy |
|---|---|---|---|---|---|---|
| Micro Ingredients Myo & D-Chiro Inositol Powder 40:1 | Micro Ingredients | 2050mg / 1 scoop (2.05 g) | $0.16 | None | Buy | |
| Wholesome Story Myo-Inositol & D-Chiro Inositol 40:1 | Wholesome Story | 2050mg / 4 capsules | $0.93 | None | Best Value | Buy |
| Ovasitol by Theralogix 90-day supply | Theralogix | 2050mg / 2 packets | $0.97 | NSF Certified | Quality Pick | Buy |
In-Depth Myo-Inositol Guides
Go deeper on myo-inositol — by goal, by form, and what the evidence actually supports:
Our Picks
Best Value: Wholesome Story Myo-Inositol & D-Chiro Inositol 40:1
2050mg per 4 capsules. $0.93/day. 30 servings per container at $27.95.
Quality Pick: Ovasitol by Theralogix 90-day supply
2050mg per 2 packets. NSF Certified. $0.97/day. 90 servings per container at $86.68.
Dose check · Myo-Inositol
What a day at the studied Myo-Inositol dose costs here
The research on Myo-Inositol uses 2,000 mg to 4,000 mg (grams/day, split 2g twice daily; often with D-chiro-inositol 40:1), and every one of the 3 products here reaches it in a single serving, so for once the price in the table and the cost of the dose are the same number. They run 15¢ to 96¢ a day.
The label trap on Myo-Inositol:the '40:1 is best'/'too much D-chiro is harmful' literature traces to researchers with undisclosed manufacturer ties; two load-bearing papers carry Expressions of Concern, one related paper retracted — the ratio is a reasonable default, not proven-superior
Method: studied range from our own Myo-Inositol dosage guide (PMID 29042448), priced against the 3 products above — capsules in whole servings, powders in fractions. Trial doses, not a prescription.
The evidence · Myo-Inositol
What the published reviews of Myo-Inositol concluded
- Antenatal dietary supplementation with myo-inositol for preventing gestational diabetes. · The Cochrane database of systematic reviews, 2023
“Evidence from seven studies shows that antenatal dietary supplementation with myo-inositol during pregnancy may reduce the incidence of gestational diabetes, hypertensive disorders of pregnancy and preterm birth.”
- Effects of myo-inositol vs. metformin on hormonal and metabolic parameters in women with PCOS: a meta-analysis. · Irish journal of medical science, 2023
“Our meta-analysis comparing hormonal and metabolic parameters between MET and MI did not show much significant difference, indicating both drugs are equally beneficial in improving metabolic and hormonal parameters in patients with PCOS.”
- Effect of myo-inositol supplementation in mixed ovarian response IVF cohort: a systematic review and meta-analysis. · Frontiers in endocrinology, 2025
“Our results suggest that MI supplementation improves the MII oocyte rate and the fertilization rate. More high-grade evidence from prospective randomized studies is warranted.”
- Myo-inositol supplementation for the prevention of gestational diabetes: A meta-analysis of randomized controlled trials. · European journal of obstetrics, gynecology, and reproductive biology, 2022
“Myo-inositol supplementation is recommended to prevent gestational diabetes with caution due to some heterogeneity.”
Method: PubMed searched in humans for systematic reviews and meta-analyses with Myo-Inositol in the title; these 4 of the 44 that qualified are shown with the authors’ own conclusion quoted rather than summarised. What it cannot tell you: whether Myo-Inositol will work for you — each of these reports an average across trials published 2022–2025, and null findings are shown here as readily as positive ones.
How these 3 Myo-Inositol products were ranked
1 of these 3 are confirmed in a certifier's registry — the only myo-inositol rows where the claim is independently backed — and the rest are ranked on cost per day at the labelled serving. Commission does not enter it: the rate is the same whichever myo-inositol you buy. Full methodology.