Ingredient

Hydrolyzed Keratin

Hydrolyzed keratin is keratin protein broken into small fragments that can adsorb onto and form a film along the hair shaft, temporarily patching damaged areas to make hair feel smoother and stronger.

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Pro-vitamin B5

Pro-vitamin B5; soothes, hydrates, and helps repair the skin and hair surface.

Argan oil

Argan oil; smooths frizz and adds shine.

Hydrolyzed Wheat Protein

A plant protein that strengthens and thickens the feel of hair.

Good to know

Animal-derived
Sourced from animals — relevant if you avoid animal-derived ingredients.

What it does

limited evidence

Benefits

Conditions hair and smooths a damaged, rough cuticle
Film-forming, so hair feels stronger and looks shinier
Humectant that helps hold moisture
Also used as a skin-conditioning agent

Side effects

Cosmetic surface effect, not a permanent structural repair
Protein buildup can leave hair stiff if heavily overused

Who it's for

Dry, damaged, chemically treated or brittle-feeling hair

Who should be careful

Anyone with a known protein sensitivity; results are temporary and wash out over time

Hydrolyzed Keratin - INCIDecoder cosmetic ingredient profilecosmetic database

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Hyaluronic Acid

A moisture magnet that holds many times its weight in water.

Urea

A humectant and gentle exfoliant in one; a dermatology staple for rough, very dry skin.

Snail mucin

Snail mucin; a hydrating, repairing ingredient popular in K-beauty for plumping and soothing skin.

Products with Hydrolyzed Keratin (12)

Gliss Hair Repair Ultimate Repair Shampooing