Journal
Hydrolyzed Keratin: The Star Ingredient of Hair Smoothing
What it is, what it does, how to recognize it
Rédaction ULTRALISS· Équipe éditoriale experte 5 July 2026 4 min read
Key takeaways
Hydrolyzed keratin is a fractionated protein that penetrates the fiber and fills porous areas. It appears in INCI as "Hydrolyzed Keratin." Suitable for damaged or colored hair.
Contents (4)
What is hydrolyzed keratin?
It's keratin whose protein chains have been broken down to penetrate the hair fiber. Ideal molecular weight: 500–5000 Da.
Mode of action
It fills porous areas, restores the structure, and seals cuticles under heat.
How to recognize it on a label
- Hydrolyzed Keratin
- Hydrolyzed Wheat Keratin (plant-based)
- Hydrolyzed Silk (similar in performance)
Who is it suitable for?
Damaged, colored, bleached, porous hair. Use sparingly on fine hair to avoid stiffness.
Frequently asked questions
Rédaction ULTRALISS
Équipe éditoriale experte
L'équipe éditoriale d'ULTRALISS réunit coiffeurs experts, formateurs et rédacteurs spécialisés dans les soins capillaires professionnels pour cheveux texturés.
Coiffeurs certifiés
Formateurs ULTRALISS Academy
15+ ans d'expérience
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