What substance provides the skin with its elasticity?

Elastin is the substance responsible for providing the skin with its elasticity. This protein is essential for enabling the skin to stretch and return to its original shape, which is crucial for maintaining the integrity and functionality of the skin. Elastin is found mainly in the dermis layer, which is the thicker of the two main layers of skin. As we age, the production of elastin decreases, which can lead to sagging and loss of firmness in the skin, highlighting the importance of elastin in skin health and appearance.

In contrast, collagen, while also a crucial protein found in the skin, primarily provides structure and strength rather than elasticity. Keratin is a fibrous protein that contributes to the protective barrier of the skin and is more prevalent in the outermost layer of the skin, rather than providing elasticity. Hyaluronic acid, known for its ability to retain moisture and provide hydration, does not contribute directly to the skin's elasticity. These roles are complementary, but elastin is specifically what gives skin its ability to stretch and rebound.