Keratin
What is Keratin?
Keratin is a tough, fibrous protein naturally present in human hair, nails, and the epidermis, providing strength and protection. In cosmetics, it derives mainly from animal sources such as sheep wool, feathers, or horns, and undergoes hydrolysis to become water-soluble for formulation use. Typically featured in haircare products like shampoos and conditioners, as well as skincare creams and lotions, it acts as a conditioning agent. By mimicking the skin's and hair's natural protein structure, keratin forms a protective film on the surface, helping to retain moisture, reduce friction between strands, and improve overall texture without penetrating deeply into the cortex.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Supports hair softness and shine by coating strands to minimize friction.
Helps maintain skin smoothness and flexibility through surface film formation.
Aids in manageability of hair prone to tangling or dryness.
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| Individuals with dry or brittle hair seeking better conditioning. | People with known allergies to wool or animal proteins. |
| People with rough skin looking for added smoothness. | Vegans preferring plant-based alternatives. |
| Those using products for daily hair maintenance. | Individuals sensitive to protein-derived ingredients. |
Safety Notes
- Rated low hazard by EWG with scores of 1-2.
- Assessed safe for cosmetic use by Cosmetic Ingredient Review.
Frequently Asked Questions about Keratin
What is keratin in cosmetics?
A protein from animal sources like wool, hydrolyzed for use as a hair and skin conditioner.
Is keratin safe for skin?
Yes, it has low hazard ratings and is deemed safe in reviewed cosmetic applications.
Does keratin clog pores?
It has a comedogenic rating of 0, indicating low risk of pore clogging.