BulkSupplements.com Hydrolyzed Keratin Powder - Gluten Free
BulkSupplements.comAmazon.com
$0.06/serving
$30.970°
💅
Keratin
other · 6 active deals
How much does Keratin cost?
The best-value Keratin right now is about $0.06 per dose — across the 6 we can price per dose the median is $0.137/dose, so shopping on cost-per-dose can cut your cost several-fold. Every Keratin deal here is ranked by cost per dose — what you actually pay per serving, not the sticker price — because forms and absorption differ, so the cheapest bottle isn’t always the cheapest dose.
Prices checked · live from the Amazon US catalog.
Right now the best value across our full Keratin catalog is at $0.06 per serving.
Median $0.137/servingCheapest quartile under $0.110across 6 tracked Keratin deals
Goals:
What Keratin does
Keratin is the structural protein of hair and nails; the supplement is a solubilized (hydrolyzed) keratin, usually sold under the branded form Cynatine HNS, marketed for hair and nail strength. Be clear-eyed about the evidence, because it is the thinnest of any beauty active we track: it rests on a single small trial (50 women, 90 days) that was funded by the ingredient's manufacturer (Roxlor Global) and co-authored by its general manager. That trial reported improvements in hair loss and nail hardness and concluded the supplement is "effective," but there is no independent replication, and because the product combines keratin with a vitamin and mineral stack, any benefit cannot be pinned on the keratin itself. — per the Cynatine HNS clinical trial (NIH PMC); not medical advice.
Forms & absorption
Sold as capsules stating milligrams of keratin per serving — the figure our cost-per-dose ranking uses. The studied amount was 500 mg/day (two 250 mg capsules), each also carrying zinc, biotin, niacin, copper, B6 and pantothenic acid; so a "keratin" product is typically a hair-skin-nails blend built around keratin, and its biotin content can interfere with some lab blood tests.
What the evidence shows for Keratin
The evidence is the weakest of the beauty actives we track: a single small, manufacturer-funded trial (n=50, 90 days), funded by Roxlor Global — the maker of the ingredient — whose general manager was an author, reported improvements in hair loss and nail hardness and concluded the supplement "is an effective supplement for improving hair and nails." The product is keratin combined with a vitamin/mineral stack, so any effect cannot be attributed to keratin alone, and there is no independent replication. — per the Cynatine HNS clinical trial (NIH PMC); not medical advice.
Keratin — safety & side effects
In the single trial available, a 90-day study of solubilized keratin (Cynatine HNS) in 50 women, "there were no adverse events reported during the study." There is no long-term safety data and no established upper limit. Note that Cynatine HNS products also contain biotin, which can interfere with some lab blood tests (troponin, thyroid and hormone assays) — tell your doctor before testing. — not medical advice.
Source: NIH Office of Dietary Supplements — Keratin fact sheet
Every Keratin deal above is ranked by real cost per dose with no paid placement — see our and .
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.
Keratin deals — FAQ
- How much does Keratin cost?
The cheapest keratin we track works out to $0.06 , against a typical $0.14 across the 6 we can price per dose — about $1.86 a month at the cheapest. That is real from live Amazon US prices, not the sticker price. The full ranking is on the Best Keratin page.
- What is the best-value Keratin per dose?
BulkSupplements.com Hydrolyzed Keratin Powder - Gluten Free at $0.06 — the lowest cost-per-dose keratin in our catalog. See the full ranking on the Best Keratin page.
- How many Keratin deals are live right now?
We're tracking 6 active Keratin deals across Amazon US and partner retailers, ranked by community votes and cost-per-dose — not paid placement.
- What's a good price for Keratin per dose?
Across the 6 Keratin deals we can price per dose (combination products are left out — their single label dose belongs to whichever ingredient the product is built around) the median cost-per-dose is $0.137; the cheapest quartile comes in under $0.110 . Anything below the median is a solid deal for the same molecule.
- How does VitaminDB rank Keratin deals?
Deals are submitted by the community and ranked by net votes (hot minus cold) plus cost-per-dose normalised across container sizes. We take no affiliate kickbacks for ordering; sponsored slots, when present, are clearly badged.
Keratin guides
Related supplements
References & sources
- A Clinical Trial to Investigate the Effect of Cynatine HNS on Hair and Nail Parameters — PubMed Central, NIH National Library of Medicine
- 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.