Keratin

What is keratin, exactly? Keratin is a structural protein that makes up 80-90% of our hair, as well as our nails and the outer layer of skin. What does keratin do? It's responsible for their strength, elasticity, and healthy appearance.

Natural keratin is too large and doesn't dissolve, so haircare products use a processed form instead—hydrolyzed keratin. Since it's broken down into smaller fragments, it can actually interact with hair.

How to use it

You'll find keratin in many types of hair and skin products, but it really shines in hair masks and conditioners.

Suitable for

Any skin type and hair condition. Use with caution if you have fine hair.

Things to know

Pairs well with all ingredients.

Evidence

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Ingredient Overview

INCI name Keratin

Function Hair and skin conditioning

CAS number 68238-35-7

Chemical formula -

Common use Face care, hair care

Keratin alternatives

Dimethicone Hydrolyzed Wheat Protein Hydrolyzed Silk

FAQ

1. What are the disadvantages of keratin?

Keratin in haircare products (such as masks and conditioners) generally doesn't have any real drawbacks. Hydrolyzed keratin penetrates hair well. That said, using too many keratin products in your routine can weigh your strands down, though it really depends on the concentration and your hair type and condition.

2. Can I use keratin products every day?

Yes, you can use lightweight keratin products—serums, oils, or leave-in creams and masks—daily. They help fight frizz, add shine, and make styling easier. Just avoid applying them to your roots and don't overdo the amount, so your hair doesn't end up looking greasy.

3. What ingredients work well with keratin?

Keratin pairs well with ingredients that hydrate, nourish, and protect hair, such as fatty alcohols and hydrolyzed proteins.