What it does
- Conditions and smooths hair, improving softness and manageability.
- Forms a light film that helps the look and feel of stronger, healthier hair.
- Popular in repair-positioned and post-chemical-treatment products.
How it works
Keratin is the structural protein of hair. Hydrolysing it produces smaller, water-soluble peptides that deposit on and into the hair shaft, widely documented to improve smoothness, moisture retention and the temporary appearance of strength. Benefits are cosmetic and build with use.
Use level
- Typical use level
- typically 1–5% of the (dilute) solution
Commonly used at 1–5% of the supplied (dilute) solution. It is supplied at a set protein concentration, so follow the supplier's guidance.
Formulation considerations
- Water-soluble; add to the cool-down phase.
- Formulate in mildly acidic to neutral systems.
- Over-use of proteins can make hair feel stiff; balance with conditioning agents.
What it pairs with & what to avoid
Pairs well with
- Panthenol and conditioning agents
- Amino acids
- Hair oils for slip
Use with care / avoid
- Protein overload (stiff feel) — balance with moisture
Regulatory status
Hydrolyzed keratin is listed in the EU CosIng database and is a well-established hair-care ingredient.
Common questions
What does hydrolyzed keratin do for hair?
It conditions and smooths hair and forms a light film that improves the look and feel of strength; benefits are cosmetic and build with use.
What percentage of hydrolyzed keratin is used?
Commonly 1–5% of the dilute supplied solution.
Can you use too much keratin?
Yes; protein overload can make hair feel stiff, so balance it with moisturising and conditioning ingredients.