What is the primary component of hair?

The primary component of hair is keratin, which is a fibrous protein that forms the structure of hair, skin, and nails. Keratin provides hair with its strength, resilience, and protective qualities. This protein is produced in the hair follicles and is responsible for the physical properties of hair, such as its texture and durability.

Collagen is primarily found in connective tissues, skin, and cartilage, and while it plays a role in the overall health and elasticity of the skin surrounding the hair, it is not a direct component of hair itself. Melanin is the pigment responsible for hair color, but it doesn't contribute to the structural integrity of the hair. Sebum is an oily substance produced by sebaceous glands that helps to moisturize and protect hair and skin, but it is not a component of hair formation. Therefore, keratin stands out as the fundamental element that makes up the hair fiber.