What is the primary component of nails?

The primary component of nails is keratin, a fibrous protein that provides strength and resilience. Keratin is also found in hair and the outer layer of skin, making it a vital structural element in the body. Its unique properties allow nails to grow, protect the tips of fingers and toes, and aid in gripping and manipulating objects.

Collagen is a protein that primarily makes up connective tissues, such as skin, tendons, and cartilage, but it is not a structural component of nails. Calcium, while essential for bone health and other bodily functions, is not a direct component of nails; instead, it plays a role in overall nail growth and strength. Chitin is a tough polysaccharide found in the exoskeleton of arthropods and some fungi, making it unrelated to the composition of human nails. Understanding that keratin is the key protein in nails helps clarify its role in nail health and appearance.