What is keratin?

Keratin is a tough fibrous protein that serves as a key structural component in various tissues of the body, including hair, nails, skin, and the outer layer of epithelial cells. Its primary function is to provide strength and resilience, protecting cells and tissues from damage. Keratin forms a protective barrier that is essential for the integrity of the skin and helps maintain its structure, preventing water loss and providing a defense against environmental factors.

This makes it distinct from other substances such as pigments or different protein types. For instance, while collagen is another vital protein in the body, it has a different composition and function, primarily providing structure to connective tissues rather than the protective qualities of keratin. Similarly, a yellow pigment or fatty cell types do not relate to the defining characteristics or roles that keratin plays in the body. The emphasis on keratin's fibrous and tough nature highlights its importance in beauty therapy, particularly in treatments targeting hair and skin health.