Best Inositol
The best inositol we track, ranked by real cost-per-dose — not paid placements. Across 7 brands, 1 are third-party tested in a public registry.
Updated October 2026prices checked what’s changed
How much does Inositol cost?
Inositol costs a median $0.24 per serving — the cheapest of the 8 we can price per dose is $0.04 per serving, or $0.08/day to reach the commonly-studied 2,000 mg dose. Prices checked October 2026.
Ranked across 8 products · prices checked Oct 10, 2026
3rd-party testedBulkSupplements.com Inositol Powder - Inositol Supplement
NSF Certified for Sport brand at $0.08 per serving.
How we rank
We rank by cost-per-dose — price ÷ servings, normalized to the daily dose (2,000 mg/day) — so bottle sizes and strengths compare fairly. Prices are scraped at publication and re-checked when the catalog refreshes (see the “Prices checked” stamp above). There is no paid placement and no kickback for ordering. Full methodology · Editorial standards.
When cheapest ≠ best value
The cheapest bottle isn’t automatically the best value: a low per-bottle price usually just means fewer servings or a smaller dose per serving. That is exactly what cost per dose normalises, which is why the ranking above is ordered by it rather than by sticker price. A bigger bottle isn’t automatically cheaper per dose either — this list already ranks by cost per dose, so a larger count only wins if it truly costs less per serving. Compare Inositol forms.
Our data on this: how much the big bottle saves per serving · the gummy tax · the form premium · the price spread.
Full ranking by cost per dose
Cost-per-serving normalizes price across bottle sizes — a 60-count and a 365-count compare fairly.
- See offer#1Best valueHealth Thru Nutrition Inositol Powder – 500g Pure Powder…
powder · 1000mg · 500 servings · $19.95
$0.04per serving$0.08 / 2,000 mg - See offer$0.08per serving2.0× #1
- See offer$0.12per serving3.1× #1$0.12 / 2,000 mg
- See offer$0.17per serving4.4× #1$0.46 / 2,000 mg
- See offer#5BulkSupplements.com Inositol Capsules - Vitamin B8…
capsule · 1000mg · 60 servings · $17.96
NSF Sport$0.30per serving7.5× #1$0.60 / 2,000 mg - See offer$0.44per serving11.1× #1$0.44 / 2,000 mg
- See offer$0.48per serving12.1× #1
- See offer$1.06per serving26.5× #1$4.23 / 2,000 mg
| # | Product | Form · dose | Tested | Servings | Price | $ / serving | $ / 2,000 mg | Buy |
|---|---|---|---|---|---|---|---|---|
| 1 | Health Thru Nutrition Inositol Powder – 500g Pure Powder…Best value | powder · 1000mg | 500 | $19.95 | $0.04 | $0.08 | See offer | |
| 2 | BulkSupplements.com Inositol Powder - Inositol… | powder · 1g | NSF Sport | 250 | $19.97 | $0.08 2.0× #1 | — | See offer |
| 3 | Myo-Inositol & D-Chiro Inositol Supplement For Women… | capsule · 2050mg | 120 | $14.95 | $0.12 3.1× #1 | $0.12 | See offer | |
| 4 | Jarrow Formulas® Inositol 750 mg | capsule · 750mg | 100 | $17.42 | $0.17 4.4× #1 | $0.46 | See offer | |
| 5 | BulkSupplements.com Inositol Capsules - Vitamin B8… | capsule · 1000mg | NSF Sport | 60 | $17.96 | $0.30 7.5× #1 | $0.60 | See offer |
| 6 | Black Girl Vitamins Inositol Supplement | capsule · 2000mg | 60 | $26.50 | $0.44 11.1× #1 | $0.44 | See offer | |
| 7 | Theralogix Ovasitol Inositol Powder - 90-Day Supply… | powder | 180 | $86.68 | $0.48 12.1× #1 | — | See offer | |
| 8 | Neurobiologix D-Chiro Inositol 500 MG | capsule · 500mg | 60 | $63.50 | $1.06 26.5× #1 | $4.23 | See offer |
See also: Inositol basics · all best-value rankings
Read: Inositol guides
Inositol brands we compare — which are third-party tested?
1 of the 7 brands ranked above appear in an independent certifier's own public registry. A certification confirms the label matches the contents — it says nothing about how well the supplement works, and an uncertified brand is not automatically worse.
Frequently asked
How much does Inositol cost?+
The cheapest inositol we track is $0.04 per serving ($19.95 for 500 servings), against a typical $0.24 per serving across the 8 we can price per dose — about $1.20 a month at the cheapest. That's real cost per dose from live Amazon US prices as of October 2026, not the sticker price.
What is the best-value Inositol supplement?+
Health Thru Nutrition Inositol Powder – 500g Pure Powder as Myo-Inositol… — $0.04 per serving ($19.95 for 500 servings), the lowest cost-per-dose inositol in our Amazon US catalog as of October 2026.
How much does Inositol cost per day?+
The cheapest inositol we track works out to $0.04 per serving, against a typical $0.24 per serving across the 8 we can price per dose; to reach the commonly-studied 2,000 mg/day dose the cheapest is $0.08/day. Retailers and review sites list a price and a serving size but rarely divide it out — this is what a day actually costs, as of October 2026.
What is the typical cost per dose for Inositol?+
About $0.24 per serving across the 8 inositol products we can price per dose (combination products are left out — their single label dose belongs to whichever ingredient the product is built around) — the cheapest we track is $0.04 per serving, with most falling between $0.11 and $0.45.
What's the cheapest effective Inositol?+
To reach the commonly-studied 2,000 mg/day dose, Health Thru Nutrition Inositol Powder – 500g Pure Powder as… is the best value at $0.08 per day — cheaper than bottles that look low-priced per serving but are underdosed.
What is the highest-quality Inositol supplement?+
Of the 7 inositol brands ranked here, 1 hold a third-party certification we could verify in a public registry: BulkSupplements.com (NSF Certified for Sport). Certification means an independent lab confirmed the label matches the contents and screened for contaminants — it does not rate how well the supplement works. The cheapest certified option is BulkSupplements.com Inositol Powder - Inositol Supplement at $0.08 per serving.
Which Inositol brands are third-party tested?+
BulkSupplements.com — NSF Certified for Sport. We only count a brand as tested when it appears in the certifier's own public registry (USP Verified, NSF Certified for Sport, Informed Choice), never on a claim printed on the label. The remaining 6 brands on this page have no certification we could verify.
Which Inositol is the top rated?+
We don't republish marketplace star ratings — they belong to the retailer, they move constantly, and a 4.6 average tells you nothing about what is in the capsule. The two things you can verify are what a dose costs and whether an independent lab checked the label. On both counts, BulkSupplements.com Inositol Powder - Inositol Supplement stands out: NSF Certified for Sport certified at $0.08 per serving.
Independent testing
1 of 7 tracked Inositol brands here are flagged as carrying independent third-party testing — a voluntary check of a product's identity, potency and contaminants by an outside lab. It's a quality signal, not a value or efficacy claim. Confirm any brand's current status on the official registries:
Testing status is self-reported by the brand or drawn from public certification and may change — always verify on the official registry before purchase.
References & sources
We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.