keratin in a sentence

Definition

Keratin is a fibrous structural protein that forms the main structural component of hair, nails, and the outer layer of skin.

Keratin is a key structural protein found in hair, nails, and the outer layer of skin.
Many hair care products are formulated with keratin to strengthen and smooth damaged hair.
The keratin in animal hooves and feathers serves a similar protective function as in human skin.
Certain medical conditions can lead to abnormal keratin production, resulting in skin disorders.
Keratin treatments have become popular in salons for achieving sleek and frizz-free hairstyles.