Best Keratin
The best keratin we track, ranked by real cost-per-dose — not paid placements. Across 4 brands, 1 are third-party tested in a public registry.
Updated October 2026prices checked what’s changed
How much does Keratin cost?
Keratin costs a median $0.14 per serving — the cheapest of the 6 we can price per dose is $0.06 per serving, or $0.06/day to reach the commonly-studied 500 mg dose. Prices checked October 2026.
Best keratin for a specific goal
Ranked across 6 products · prices checked Oct 10, 2026
Top pick · Best valueSee offer on Amazon
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.
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 Keratin 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 valueBulkSupplements.com Hydrolyzed Keratin Powder - Gluten…
powder · 500mg · 500 servings · $30.97
NSF Sport$0.06per serving$0.06 / 500 mg - See offer$0.11per serving1.7× #1$0.11 / 500 mg
- See offer$0.12per serving1.9× #1$0.12 / 500 mg
- See offer$0.16per serving2.5× #1$1.57 / 500 mg
- See offer$0.18per serving3.0× #1$1.85 / 500 mg
- See offer$0.25per serving4.0× #1$0.25 / 500 mg
| # | Product | Form · dose | Tested | Servings | Price | $ / serving | $ / 500 mg | Buy |
|---|---|---|---|---|---|---|---|---|
| 1 | BulkSupplements.com Hydrolyzed Keratin Powder - Gluten…Best value | powder · 500mg | NSF Sport | 500 | $30.97 | $0.06 | $0.06 | See offer |
| 2 | Vitamatic Hydrolyzed Keratin 500mg per Serving… | capsule · 500mg | 240 | $25.99 | $0.11 1.7× #1 | $0.11 | See offer | |
| 3 | Vitamatic Hydrolyzed Keratin 500mg per Serving… | capsule · 500mg | 120 | $13.99 | $0.12 1.9× #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 3.0× #1 | $1.85 | See offer | |
| 6 | Nutricost Keratin Hydrolized Peptide Capsules - 500MG | capsule · 500mg | 60 | $14.95 | $0.25 4.0× #1 | $0.25 | See offer |
See also: Keratin basics · all best-value rankings
Read: Keratin guides
Keratin brands we compare — which are third-party tested?
1 of the 4 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 Keratin cost?+
The cheapest keratin we track is $0.06 per serving ($30.97 for 500 servings), against a typical $0.14 per serving across the 6 we can price per dose — about $1.86 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 Keratin supplement?+
BulkSupplements.com Hydrolyzed Keratin Powder - Gluten Free — $0.06 per serving ($30.97 for 500 servings), the lowest cost-per-dose keratin in our Amazon US catalog as of October 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 the 6 we can price per dose; 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 October 2026.
What is the typical cost per dose for Keratin?+
About $0.14 per serving across the 6 keratin 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 $0.06 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.
What is the highest-quality Keratin supplement?+
Of the 4 keratin 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 Hydrolyzed Keratin Powder - Gluten Free at $0.06 per serving.
Which Keratin 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 3 brands on this page have no certification we could verify.
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 both counts, BulkSupplements.com Hydrolyzed Keratin Powder - Gluten Free stands out: NSF Certified for Sport certified at $0.06 per serving.
Independent testing
1 of 4 tracked Keratin 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
- 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.