Keratin is a fibrous structural protein naturally produced by the body that plays a crucial role in forming and maintaining the health of hair, skin, and nails. It provides strength, protection, and resilience to these tissues. Specifically, keratin helps:

• Form the outer layer of skin (epidermis), hair, and nails, giving them structure and durability.
• Support skin healing and protect epithelial cells from damage or stress.
• Make the skin nearly waterproof and strong by forming a tough matrix.
• Strengthen hair and nails, keeping them healthy and resistant to damage from environmental factors or chemical exposure

There are two main types of keratin in the body: alpha-keratins (mostly fibrous and helical) and beta-keratins (tough and rigid sheets), which contribute to the varying toughness of keratinized tissues like hair, nails, feathers, and horns

. In hair care, keratin treatments and products help by:

• Strengthening hair strands and repairing damage.
• Smoothing the hair cuticle to reduce frizz and improve shine.
• Making hair softer, more manageable, and easier to style.
• Reducing split ends and breakage, promoting healthier hair growth

Overall, keratin is essential for the structural integrity and protective functions of hair, skin, and nails, as well as for cosmetic benefits when used in hair treatments.