Ovasitol vs Micro Ingredients Inositol (2026)
Buy Ovasitol. It is on NSF/ANSI 173, so someone outside the brand checks its label, and it costs $0.96 a day for 4 g. Micro Ingredients has the same amounts for $0.45, but no public list checks it.
By Erin Rose Updated October 20, 2026 Methodology
Price matters most? Micro Ingredients costs less. That is why it scores higher. Same amounts a scoop, about $187 less a year at 4 g a day. You give up the outside check: its “3rd party lab tested” names no lab. How each tub is checked.
How we checked
- 5
- testing lists searched for each tub
- 1
- label in NIH’s database (Ovasitol; Micro Ingredients has none)
- 3
- sizes priced at the two brands’ own stores
- 4 g
- a day, the amount both are priced at
Is either one third-party tested?
Only Ovasitol. It is on NSF/ANSI 173, which checks that the label is accurate and that contaminants stay under set limits, with factory audits. Micro Ingredients’ page says “3rd party lab tested,” but it names no lab and posts no lot report we could find, so you can’t check the claim.
Ovasitol’s NSF/ANSI 173 listing, as we saw it
| Testing list | Ovasitol | Micro Ingredients |
|---|---|---|
| NSF/ANSI 173 | Listed | Not found |
| NSF Certified for Sport | Not found | Not found |
| Informed Sport | Not found | Not found |
| Informed Choice | Not found | Not found |
| USP Verified | Not found | Not found |
Is it the same recipe?
On paper, yes. Each scoop has 2 g of myo-inositol and 50 mg of D-chiro-inositol, a 40:1 ratio. Two scoops a day give 4 g, the amount many trials used. The difference is what you can check. Ovasitol’s label is in NIH’s label database, shown below. Micro Ingredients’ amounts come only from its own web page.
What the price gap costs you
Ovasitol costs 2.1 times as much. At each brand’s own list price, 4 g a day costs $0.45 with Micro Ingredients and $0.96 with Ovasitol: $165 against $352 a year.
| Size | List price | 4 g a day | A year |
|---|---|---|---|
| Ovasitol, canister, 180 servings | $86.68 | $0.96 | $352 |
| Micro Ingredients, 1 pound | $49.95 | $0.45 | $165 |
| Micro Ingredients, 2 pounds | $88.95 | $0.40 | $147 |
Prices move. To check a tub you see somewhere else, divide its price by the grams of myo-inositol in it, then multiply by 4. Every myo-inositol we price: myo-inositol cost per dose.
Why does our pick score lower?
Our pick scores lower: Micro Ingredients gets 8.5 out of 10 and Ovasitol 8.0. Micro Ingredients gets full cost points and half the testing points, for its own “tested” claim. Ovasitol gets full testing points but no cost points, because it costs 2.1 times as much. That leaves Micro Ingredients half a point ahead. We still pick Ovasitol: a check you can look up matters more to us than $187 a year. How we score.
Who should buy which
- You want an outside check of what is in the tubOvasitol
The one of the two on a public testing list. Check the price.
- Price matters most, and you trust the brand’s labelMicro Ingredients
Same amounts for less. No outside check, and no NIH label record. Check the price.
- You already have a tub of either oneBuy nothing yet
Finish it. Both give 4 g in two scoops.
- You are pregnant, trying to get pregnant, or take a prescription medicineAsk your doctor first
Ask your doctor first if you are pregnant, breastfeeding or trying to get pregnant, if you take lithium or valproate, or if you take a prescription medicine such as metformin or another diabetes medicine.
Questions
Is Ovasitol or Micro Ingredients inositol better?
Buy Ovasitol if you want a product someone outside the brand checks: it is on NSF/ANSI 173, and its label gives 4 g a day. Buy Micro Ingredients if price matters most and you trust the brand’s label: it has the same amounts a scoop for less than half the cost a day, but no public testing list names it and NIH has no record of its label.
What is the 40:1 inositol ratio?
It means 40 parts myo-inositol to 1 part D-chiro-inositol: 2 g of myo-inositol with 50 mg of D-chiro-inositol a scoop, in both products. The ratio rests on two small trials, and no large trial shows a 40:1 blend beats plain myo-inositol.
How long did inositol trials run?
The trials we read ran about 3 to 6 months. There is no set timeline for one person. No trial tested how soon a change starts.
Sources
- Ovasitol: NSF/ANSI 173 listing for Theralogix (info.nsf.org); NIH Dietary Supplement Label Database, label 272224; theralogix.com list price.
- Micro Ingredients: microingredients.com product page and list price; no record in NIH’s label database.
- Trials that gave 4 g a day (no placebo group in either): Fruzzetti F, et al. Gynecol Endocrinol. 2017;33(1):39-42. PubMed 27808588. Soldat-Stanković V, et al. J Endocrinol Invest. 2022;45(3):583-595. PubMed 34665453. Ratio trials: Nordio M, Proietti E. Eur Rev Med Pharmacol Sci. 2012;16(5):575-81. PubMed 22774396; Nordio M, et al. Eur Rev Med Pharmacol Sci. 2019;23(12):5512-5521. PubMed 31298405
- Scores updated October 13, 2026. Product photos: Amazon, shown under the Associates program licence.