Best Keratin
The best keratin we track, ranked by real cost-per-dose — not paid placements. Across 6 tracked options the typical dose runs $0.14 per serving.
Updated August 2026prices checked what’s changed
Ranked across 6 products · prices checked Aug 25, 2026
How we rank
We rank by cost-per-dose — price ÷ servings, normalized to the daily dose (500 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.
That cost-per-dose number is the one most retailers and review sites leave out — they’ll show a sticker price and a serving size, but not what a day actually costs. We compute it for every product so you can compare like for like.
When cheapest ≠ best value
The cheapest bottle isn’t automatically the best value: a low-absorption form (magnesium oxide is the classic example) can look cheap per milligram yet deliver less of what you actually absorb. Where forms differ, compare cost per absorbed or elemental unit, not the compound weight on the label. 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 Keratin forms.
Our data on this: the big bottle saves a median ~86% per serving · the gummy tax (~2× more) · 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.
| # | Product | Form · dose | Tested | Servings | Price | $ / serving | $ / 500 mg | Buy |
|---|---|---|---|---|---|---|---|---|
| 1 | BulkSupplements.com Hydrolyzed Keratin Powder - Gluten…Best value | powder · 500mg | 500 | $31.97 | $0.06 | $0.06 | See offer | |
| 2 | Vitamatic Hydrolyzed Keratin 500mg per Serving - 120… | capsule · 500mg | 240 | $25.99 | $0.11 1.7× #1 | $0.11 | See offer | |
| 3 | Vitamatic Hydrolyzed Keratin 500mg per Serving - 120… | capsule · 500mg | 120 | $13.99 | $0.12 1.8× #1 | $0.12 | See offer | |
| 4 | Swanson Keratin (from Tibetan Wool) - Natural Supplement… | capsule · 50mg | 240 | $37.71 | $0.16 2.5× #1 | $1.57 | See offer | |
| 5 | Swanson Keratin (from Tibetan Wool) - Natural Supplement… | capsule · 50mg | 60 | $11.09 | $0.18 2.9× #1 | $1.85 | See offer | |
| 6 | Nutricost Keratin Hydrolized Peptide Capsules - 500MG | capsule · 500mg | 60 | $14.95 | $0.25 3.9× #1 | $0.25 | See offer |
See also: Keratin basics · all best-value rankings
Read: Keratin guides
Frequently asked
What is the best-value Keratin supplement?+
BulkSupplements.com Hydrolyzed Keratin Powder - Gluten Free — $0.06 per serving ($31.97 for 500 servings), the lowest cost-per-dose keratin in our Amazon US catalog as of August 2026.
How much does Keratin cost per day?+
The cheapest keratin we track works out to $0.06 per serving, against a typical $0.14 per serving across 6 products; to reach the commonly-studied 500 mg/day dose the cheapest is $0.06/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 August 2026.
What is the typical cost per dose for Keratin?+
About $0.14 per serving across 6 tracked keratin products — the cheapest we track is $0.06 per serving, with most falling between $0.11 and $0.18.
What's the cheapest effective Keratin?+
To reach the commonly-studied 500 mg/day dose, BulkSupplements.com Hydrolyzed Keratin Powder - Gluten Free is the best value at $0.06 per day — cheaper than bottles that look low-priced per serving but are underdosed.
Which Keratin 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 this page the best value is BulkSupplements.com Hydrolyzed Keratin Powder - Gluten Free at $0.06 per serving; no brand here holds a certification we could verify in a public registry.
References & sources
- Keratin — Health Professional fact sheet — NIH Office of Dietary Supplements
- USP Verified product participants — U.S. Pharmacopeia
- NSF certified products — NSF
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.