The skin is composed mostly of collagen proteins — about 75% — so the smooth, plump appearance of young, healthy skin is due in large part to the presence of healthy collagen levels.
Found in the dermis layer, the mesh-like framework of collagen gives the skin its strength and durability.
- 6% of the total body mass
- Over a third of our body's proteins
- 75% of our skin 30% of our bones and in joints
- 70% of cartilage (软骨)
Cartilage covers the ends of bones at the joints and allows the them to slip smoothly over each other. It forms a smoother bearing between the two ends of bones that touch.
- 90% of tendons (肌腱) and ligaments (韧带)
Ligaments hold bones together at joints.
Tendons attach muscles to bones, so the muscles' contractions can be transferred across the joints and pull on the bones.
So far, scientists have only identified approximately 29 sub-types of collagen. In the human body, over 90% of the collagen is Type I (CI), which is skin, bone, organs, tendons, vascular and ligature.