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Hydrolyzed Keratin

Doctor's Best
4.5
★ ★ ★ ★ ★
(2031 ratings)
Keratin 500 mg
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Score88
A full dose of branded hydrolyzed keratin offers excellent targeted quality and value, though the formula is intentionally narrow.
How scoring works
Quantity:60 Veggie Cap(s) • (60 servings)
Goals:
Nail Health
Hair Health

Score 88

A full dose of branded hydrolyzed keratin offers excellent targeted quality and value, though the formula is intentionally narrow.
How scoring works
$24.05($0.40 per serving)
iHerb
$ 24.14
Vitacost
$ 26.55
Amazon
$ 24.05
Pure Formulas
$ 24.76
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Analysis

KeraGLO provides 500 mg of hydrolyzed keratin, directly supplying a structural protein relevant to hair and nails. The branded form and hydrolysis address the main digestibility weakness of generic keratin.

Exact active disclosure and a full target amount make the formula easy to assess. Its single-active focus does not address iron, zinc, vitamin D, biotin status, scalp circulation, or other causes of hair and nail changes.

One vegetable capsule per serving and a low ongoing cost create strong practical value. It best fits adults seeking targeted keratin rather than a broad multinutrient beauty product.

Who is it for
  • Adults seeking focused hair and nail keratin
  • People who want a hydrolyzed branded form
  • Users who prefer one capsule daily
Best for
  • Targeted keratin supplementation
  • Hair strength support
  • Nail structural support

Pros

  • Full 500 mg keratin amount
  • Branded hydrolyzed KeraGLO form
  • Excellent one-capsule value

Cons

  • Does not address common nutrient deficiencies
  • Keratin source is not stated
  • Single-pathway formula may not fit complex hair concerns

Warnings

  • The keratin source is undisclosed and may matter for animal-protein allergies or dietary restrictions.
  • Keratin protein may cause digestive discomfort in sensitive users.
  • New or significant hair loss can have medical causes that a keratin supplement does not address.

Nutrient quality

98 Highest impact

Ingredient forms and dosing are well aligned with the intended use. The focused formula avoids obvious excesses and low-value additions.

Ingredient transparency

86 Highest impact

Most active amounts are disclosed and core ingredients are identifiable. Missing serving, blend, or excipient details keep the label from being fully transparent.

Customer satisfaction

70 High impact

The aggregate rating is strong and supported by a useful volume of ratings. Specific feedback was not supplied, so recurring complaints and purpose fit remain uncertain.

Value for money

96 Highest impact

Formula quality and serving efficiency provide excellent practical value. Focused ingredients and strong category competitiveness reinforce that advantage.

Report analysis

Goals

Nail Health
Impact
Highest effect
A+ Goal FitA+ Strength of SupportC CoverageA+ Formula Quality
Keratin · 500 mg

Hydrolyzed keratin directly supplies the main structural protein family associated with nails. The branded 500 mg amount matches the established target provided for this ingredient.

Hydrolysis supports digestion, and the exact active amount is clearly stated. The single-active formula is narrow but offers strong depth without unrelated ingredients.

Study evidence
Keratin Adverse 7 studies
Hair Health
Impact
Highest effect
A Goal FitA Strength of SupportC CoverageA+ Formula Quality
Keratin · 500 mg

Hydrolyzed keratin directly supplies a structural protein related to hair strength and resilience. The 500 mg KeraGLO amount is substantial and more targeted than a generic vitamin blend.

The branded hydrolyzed form and exact amount provide strong transparency and likely improve digestibility. The single active does not address iron, zinc, vitamin D, circulation, or androgen-related shedding.

Study evidence
Keratin Disputed 14 studies

Ingredients

IngredientAmount per serving
Sodium
15 mg
KeraGLO (Keratin, Hydrolyzed)
500 mg
Gluten Free Adults 18–50
Report overview
A+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The branded, hydrolyzed keratin provides strong evidence of suitable processing for digestion and absorption. Its clearly disclosed daily amount matches the established target for hair and nail support. The low serving cost also delivers excellent value for the active quality and dose.

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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. The Effects of an Oral Supplementation of a Natural Keratin Hydrolysate on Skin Aging: A Randomized, Double-Blind, Placebo-Controlled Clinical Study in Healthy Women.
    Tursi F; Nobile V; Cestone E; De Ponti I; Lepoudere A; Sergheraert R; Soulard JP · Journal of cosmetic dermatology · 2025
    Randomized trialHair Health Nail Health forKeratin
  2. Halloysite/Keratin Nanocomposite for Human Hair Photoprotection Coating.
    Cavallaro G; Milioto S; Konnova S; Fakhrullina G; Akhatova F; Lazzara G; Fakhrullin R; Lvov Y · ACS applied materials & interfaces · 2021
    In vitro / ex vivo studyHair Health forKeratin
  3. Annurca Apple Nutraceutical Formulation Enhances Keratin Expression in a Human Model of Skin and Promotes Hair Growth and Tropism in a Randomized Clinical Trial.
    Tenore GC; Caruso D; Buonomo G; D'Avino M; Santamaria R; Irace C; Piccolo M; Maisto M; Novellino E · Journal of medicinal food · 2018
    Randomized trialHair Health forKeratin
  4. Comparative Analysis of Type I Keratin Expression By Nail Consistency: An Immunohistochemistry Study.
    Mingorance Álvarez E; Rodríguez-León J; Pérez Pico AM; Mayordomo R · Applied immunohistochemistry & molecular morphology : AIMM · 2022
    Cross-sectional study32 participantsNail Health forKeratin
  5. Keratin/alginate hybrid hydrogels filled with halloysite clay nanotubes for protective treatment of human hair.
    Cavallaro G; Caruso MR; Milioto S; Fakhrullin R; Lazzara G · International journal of biological macromolecules · 2022
    In vitro / ex vivo studyHair Health forKeratin
  6. Patient Satisfaction and Adverse Effects Following the use of Topical Hair Fiber Fillers.
    Babadjouni A; Juhasz M; Pham C; Csuka E; Hedayati B; Evron E; Mesinkovska NA · International journal of trichology · 2024
    Cross-sectional study40 participantsHair Health forKeratin
  7. Exposure to toxic agents alters organic elemental composition in human fingernails.
    Schumacher E; Dindorf W; Dittmar M · The Science of the total environment · 2009
    Cross-sectional study120 participantsNail Health forKeratin
  8. Human keratin diseases: hereditary fragility of specific epithelial tissues.
    Corden LD; McLean WH · Experimental dermatology · 1997
    Narrative reviewNail Health forKeratin
  9. Phenotype and genotype features of Vietnamese children with pachyonychia congenita.
    Chu HT; Dinh Duong TA; Le DH; Le TV; Nguyen BB; Dang CV; Vu QV · Pediatrics and neonatology · 2023
    Case series7 participantsNail Health forKeratin