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Hydrolyzed
Keratin

Moderate study situation·7/10
A higher score indicates better study conditions, but not necessarily effectiveness.

Bioavailable protein supplement studied for supporting hair, skin, and nail health.

Tissue RepairEssential NutrientSkin Health
dose range
300–500 mg
Single daily dose
Consumption
Take with food to support absorption and reduce potential for gastrointestinal discomfort.
Not fat-soluble.
Best time
Best taken in the morning or with the first meal.

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Description

Hydrolyzed keratin is a protein supplement derived from animal sources like wool or feathers, processed into peptides for increased absorption. It is popular for improving structural health of hair, skin, and nails.

benefits
Main effects with level of evidence
Moderate
Note on evidence

Main evidence relates to small clinical trials and mechanistic studies showing improvement in skin, nail, and hair parameters.

Supports hair strength and reduces hair loss

Moderate

Supplementation with hydrolyzed keratin may improve hair strength, reduce breakage, and enhance shine, particularly in women with damaged hair.

Particularly relevant for: Those with damaged or brittle hair
2 · PubMed – Keratin Supplementation for Hair

Improves nail hardness and reduces brittleness

Moderate

Hydrolyzed keratin has been observed to strengthen brittle nails and enhance growth by promoting keratin matrix integrity.

Particularly relevant for: People with brittle or weak nails
3 · PubMed – Keratin and Nail Health

Enhances skin hydration and elasticity

Limited

Clinical use of hydrolyzed keratin is linked to improved skin moisture retention and a modest increase in elasticity.

Particularly relevant for: Adults seeking to improve skin health
4 · PubMed – Keratin Peptides and Skin

Last updated:

This information is for educational purposes only and does not replace medical advice.
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This website is for educational and informational purposes only and does not constitute medical advice or professional services. The information provided should not be used to diagnose or treat any health problem or disease. Persons requiring medical advice should consult a licensed physician.