It is the key structural material making up scales, hair, nails, feathers, horns, claws, hooves, and the outer layer of skin in tetrapod vertebrates. Keratin also protects epithelial cells from …

Mar 6, 2025 · Keratin is a popular ingredient in hair care products, such as shampoos, conditioners, and treatments, due to its ability to strengthen and repair damaged hair. It can …

Dec 15, 2025 · Keratin, fibrous structural protein of hair, nails, horn, hoofs, wool, feathers, and of the epithelial cells in the outermost layers of the skin. Keratin serves important structural and …

Nov 3, 2025 · Keratin is a naturally occurring protein within the body that aids in the health of the skin, hair, and nails. It is also used in hair products.

Keratin is often marketed as a cosmetic miracle, but its real importance goes far beyond shiny hair or smoother skin. This structural protein is fundamental to how the body protects itself from ...

Jul 18, 2025 · Keratin is a fibrous structural protein predominantly found in epithelial cells. It is responsible for forming protective layers on the surface of the skin, hair, nails, and other …

Aug 27, 2025 · Keratin is a fibrous protein that serves as a structural building block in the human body. It provides strength and integrity to various tissues, forming a protective barrier against …

Sep 24, 2025 · A keratin treatment is a semi-permanent hair straightening method that aims to smooth and straighten frizzy or curly hair, says Ross Kopelman, MD, a board-certified hair …

Sep 17, 2018 · Keratin is the type of protein that makes up your hair, skin, and nails. Keratin can also be found in your internal organs and glands. Keratin is a protective protein, less prone to …

keratin (KAYR-uh-tin) A type of protein found on epithelial cells, which line the inside and outside surfaces of the body. Keratins help form the tissues of the hair, nails, and the outer layer of the …