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SESH INGREDIENT FILE

Keratin

INCI Keratin

Protein / Nail Support Active Ingredients

What it is & what it does

Keratin is a structural protein used in nail and hair formulas mainly for surface conditioning and film formation.
Topical keratin can temporarily improve feel and reduce roughness, but it does not permanently rebuild the living nail matrix from the outside.

Usage & cautions

Information approach Consumer-friendly summaries are informed by established cosmetic ingredient references such as INCIDecoder and Paula’s Choice Ingredient Dictionary, while avoiding turning ingredient-level evidence into medical claims about the finished product.