Evidence supporting the use of: Keratin Peptides
For the body system: Hair

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Table of Contents

Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Keratin peptides are hydrolyzed forms of keratin, a structural protein naturally found in hair, skin, and nails. Their use in supporting the hair body system is primarily grounded in scientific rationale, although the evidence base is still emerging and somewhat limited in scope. Keratin is a key component of the hair shaft, contributing to its strength, elasticity, and overall appearance. Hydrolyzed keratin peptides are commonly included in topical hair care products (such as shampoos, conditioners, and treatments) and, more recently, as oral supplements. Laboratory and in vitro studies suggest that these peptides can bind to damaged areas of the hair cuticle, potentially improving tensile strength, reducing breakage, and enhancing shine by filling in gaps and smoothing the surface of the hair shaft.

Some small-scale human studies and clinical trials have reported improvements in hair strength, volume, and appearance after topical or oral keratin peptide use. However, these studies often have limitations, such as small sample sizes, short durations, or funding from supplement manufacturers, which may introduce bias. As a result, while there is a plausible mechanism and some preliminary clinical support for keratin peptides aiding hair health, the overall level of scientific evidence is moderate rather than robust. More large-scale, independent, and well-controlled trials are needed to confirm their efficacy and determine optimal usage.

More about Keratin Peptides
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Other body systems supported by Keratin Peptides

Hair
Nails
Skin

Products containing Keratin Peptides

We currently have no products on Vitabase that contain this ingredient.