Collagen is a fibrous protein that provides structure and support to skin, as well as tendons, ligaments, bones, and other tissues. It makes up about 70% of the dry weight of skin and is responsible for its strength, elasticity, and resilience.

While collagen is the most abundant, other important components of skin include:

* Keratin: A tough, fibrous protein that makes up the outer layer of skin, protecting it from damage and water loss.

* Elastin: A protein that allows skin to stretch and return to its original shape.

* Water: Skin contains a significant amount of water, contributing to its plumpness and hydration.

* Other proteins: Various other proteins, lipids, and carbohydrates contribute to the skin's overall function.

So, while collagen is the most abundant component, it's crucial to understand that skin is a complex structure made up of many different compounds working together.