Best Myo-Inositol Supplements 2026: Cost per Effective Dose
Top pick for Myo-Inositol: Micro Ingredients Myo & D-Chiro Inositol Powder 40:1 — 2,050mg per 1 scoop (2.05 g), $0.31/day. Our best-value pick.
Registry check · Myo-Inositol
Does anyone independently verify Myo-Inositol supplements?
2 of the 3 Myo-Inositol products on this page are confirmed in NSF/ANSI 173: Ovasitol by Theralogix 90-day supply; Wholesome Story Myo-Inositol & D-Chiro Inositol 40:1. Wholesome Story Myo-Inositol & D-Chiro Inositol 40:1 does not show the mark on the listing, so the table’s certification column, which repeats the listing, does not show it either. For the others, the listing may name a certification, but we did not find it in a public registry — that is 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.
The 3 products on this page checked against all 5,317 US NSF, USP and Informed Sport listings, 2026-08-25. Full method and limitations.
What Myo-Inositol labels show
Priced per day, these myo-inositol products run $0.31 to $1.87 — a 6.0× 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 $0.31 states about the same dose per serving as Wholesome Story at $1.87.
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 | 2,050mg / 1 scoop (2.05 g) | $0.31 | None | Best Value | Buy |
| Ovasitol by Theralogix 90-day supply | Theralogix | 2,050mg / 1 scoop (2.22 g) | $0.96 | NSF Certified | Quality Pick | Buy |
| Wholesome Story Myo-Inositol & D-Chiro Inositol 40:1 | Wholesome Story | 2,050mg / 4 capsules | $1.87 | None | 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: Micro Ingredients Myo & D-Chiro Inositol Powder 40:1
2,050mg per 1 scoop (2.05 g). $0.31/day. 221 servings per container at $34.95.
Quality Pick: Ovasitol by Theralogix 90-day supply
2,050mg per 1 scoop (2.22 g). NSF Certified. $0.96/day. 180 servings per container at $86.68.
Dose check · Myo-Inositol
Does one serving reach the studied Myo-Inositol dose?
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). Every one of the 3 products here reaches the low end in a single serving, so one serving a day covers the studied dose.
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), checked against the 3 products above that state a dose — capsules in whole servings, powders in fractions. Trial doses, not a prescription.
How these 3 Myo-Inositol products were ranked
2 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.