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Summary: A protein found in the deeper layers of skin that keeps it firm, smooth, and elastic.

Collagen forms a network in the dermis—the layer beneath the surface of the skin. It acts like scaffolding, giving skin its structure and bounce. As we age, collagen breaks down and isn’t replaced as quickly, which can lead to wrinkles and sagging.
Sun exposure, smoking, and inflammation can speed up collagen loss. Some skincare products and treatments aim to protect collagen or encourage the skin to make more, helping improve firmness and reduce signs of aging.