Hydrolyzed Keratin
A hydrolyzed keratin protein. It forms a smoothing film and helps hold water in skin. Well tolerated.
Evidence by route
Topical application
A functional protein. Safe.
- CIR Cosmetic Ingredient Review safety assessment
How to read tiers A–F
- BLimited evidence. One RCT or several controlled studies with limitations
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
- Suitable for
- Normal, Dry, Combination, Oily, Sensitive
About this ingredient
Hydrolyzed keratin (INCI: Hydrolyzed Keratin) is a protein broken down into small peptides so it dissolves in water and spreads evenly through a formula. On the skin it forms a thin film that smooths the surface and helps hold some moisture. It shows up mostly in moisturizers and hair products. On efficacy, this is a functional conditioning ingredient, not a treatment active. It softens the feel of skin and improves the immediate sensory experience, but it does not fill wrinkles or rebuild the barrier from within. Its role is supportive. Applied topically it is not absorbed in any meaningful way, so it can be used during pregnancy and breastfeeding without concern. Tolerance is high: irritation and allergy potential are both low, which makes it suitable for sensitive skin. At usual concentrations it is not comedogenic.
Frequently asked questions
Is Hydrolyzed Keratin safe during pregnancy?
Hydrolyzed Keratin is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Hydrolyzed Keratin for?
Hydrolyzed Keratin suits: normal, dry, combination, oily, sensitive.
What is Hydrolyzed Keratin and what does it do in cosmetics?
A hydrolyzed keratin protein.
What's the INCI name for Hydrolyzed Keratin?
The INCI name is Hydrolyzed Keratin.
See Hydrolyzed Keratin in a product composition right on the store page
The Evigrade extension adds an evidence panel to iHerb, Sephora, Druni and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Similar role in the formula
Explore by category
Published: · updated: