Inositol is a carbocyclic compound often grouped with the B vitamins, though it is not actually a vitamin. People commonly shop for it for PCOS-related insulin sensitivity and hormone-balance goals, fertility support, and sometimes mood support. The market includes plain myo-inositol powders, capsule products, gummies, and formulas that pair myo-inositol with d-chiro-inositol in a fixed ratio.
What makes inositol shopping tricky is that products with very different formulas can look interchangeable at first glance. Some of the cheapest options are plain bulk myo-inositol powders. More expensive options may use capsules or tablets, a 40:1 myo-inositol to d-chiro-inositol blend, or extra ingredients aimed at broader hormone-support positioning. The rankings below use 4 g/day so powders, capsules, tablets, and gummies can be compared on the same monthly-cost basis.
Prices as of June 12, 2026. Prices update daily; this page updates monthly. For current prices and full interactive filters, see the Inositol compare page.
| Rank | Brand | Product | Form | Cost per month | Price |
|---|---|---|---|---|---|
| 1 | WHYZ | Pure Myo-Inositol Powder Unflavored Inositol Supplement Pow… | Powder | $3.55 | $32.49 |
| 2 | Vitamatic | Vitamatic Myo-Inositol Powder 2000 mg per Serving | 500 g… | Powder | $4.32 | $17.99 |
| 3 | Nutricost | Nutricost Inositol Powder 1LB (454 Grams) - Gluten Free, No… | Powder | $7.12 | $26.95 |
| 4 | Micro Ingredients | Micro Ingredients Myo-Inositol & D-Chiro Inositol Powder, 2… | Powder | $7.28 | $54.99 |
| 5 | NOW Foods | NOW Foods Supplements, Inositol Powder, Neurotransmitter Si… | Powder | $8.46 | $32.00 |
| Rank | Brand | Product | Form | Cost per month | Price |
|---|---|---|---|---|---|
| 1 | Oxify | Oxify Myo-Inositol 2000 mg | 120 Tablets | Gluten-Free, N… | Tablets | $9.99 | $9.99 |
| 2 | Vitamatic | Vitamatic Myo-Inositol 2000 mg Per Serving – 240 Vegetable… | Capsules | $9.99 | $9.99 |
| 3 | Carlyle | Carlyle Myo-Inositol 2600mg | 180 Capsules | Extra Streng… | Capsules | $17.43 | $16.99 |
| 4 | Totaria | Totaria Myo-Inositol & D-Chiro Inositol Supplement Capules… | Capsules | $19.50 | $19.99 |
| 5 | Brieofood | Brieofood Myo Inositol 2000 mg per Serving - 60 Tablets - 3… | Tablets | $19.98 | $9.99 |
See all Inositol products with full filter and sort options ->
Decide first whether you want plain myo-inositol or a myo plus d-chiro formula. This is the biggest reason prices split so sharply. Many low-cost powders are straightforward myo-inositol only. That can be exactly what some shoppers want, but it is not the same thing as a product that includes d-chiro-inositol in a fixed ratio. If you are trying to match a 40:1 style formula, the cheapest plain powder is not an apples-to-apples substitute.
Read the Supplement Facts line, not just the word "inositol" on the front. In this market, some labels clearly separate myo-inositol and d-chiro-inositol with their individual amounts, while others say only "Inositol" or specify only myo-inositol. That difference matters. If you want a combined formula, look for both forms named on Supplement Facts and check the actual milligram amounts instead of assuming the front label tells the whole story.
Powder is usually the value baseline, but it often adds measuring friction. Several of the cheapest products are large tubs or pouches with hundreds or even thousands of servings at small scoop sizes. That can drive the monthly cost way down, but a tiny serving such as 600 mg or 1 g means you may need multiple scoops per day to reach a 4 g comparison point. A capsule or tablet may cost more while being easier to use consistently.
Watch for products that become expensive because of form, not necessarily because they deliver more inositol. Tablets, gummies, and capsule blends can end up far pricier per month than bulk powder even before you decide whether the formula difference matters to you. Convenience can be worth paying for, but it should be a conscious tradeoff rather than something hidden behind a wellness-focused front label.
Check whether extra ingredients are changing the comparison. Some higher-priced inositol products are not just selling inositol itself. They may add d-chiro-inositol, or broader hormone-support ingredients that change what you are buying and why the price rises. If your goal is mainly inositol, the cleanest value comparison comes from products where the formula is transparent about how much of each form you are getting.
Use serving count and daily pill count as a reality check. Two products can both look reasonable on a shelf but work very differently once you follow the label. Some capsule blends require four capsules for one serving. Some powders rely on repeated scoops. Before assuming a bottle is a bargain, check how many full daily servings it really provides at the amount you plan to take.
Use quality and testing claims as tie-breakers after the formula is clear. Third-party testing, GMP manufacturing, vegan capsules, or purity language can help when you are choosing between otherwise similar options. They are useful after you know whether the product is plain myo-inositol or a combined formula, how much it provides per serving, and whether the monthly cost still makes sense for the form.
Inositol is not hard to compare when the label is explicit. The problem is that "inositol" can be used as a broad term while the actual formula may be plain myo-inositol, a myo plus d-chiro blend, or a more elaborate hormone-support product. The cleanest labels are the ones that name the exact form or forms and show the milligram amounts for each one on Supplement Facts.
Evidence for inositol is moderate, with the strongest support around insulin sensitivity and related metabolic markers in PCOS. Evidence is less settled for broader fertility, ovulation, and pregnancy outcomes than many labels imply, so it is worth separating evidence-backed use cases from broader marketing language.
The 4 g/day comparison point is a practical way to line products up on the same monthly-cost basis, not a claim that every shopper needs that exact amount. Inositol is generally well tolerated, but gastrointestinal side effects can happen at higher intakes, and people who are pregnant, trying to conceive, managing PCOS treatment, or taking prescription medication should check with a clinician before using it regularly.