Collagen, a fibrous protein found in connective tissue, bone and cartilage, basically holds the body together. The loss of collagen is what causes sagging and deep wrinkles in older people.

• 胶原蛋白是存在于结缔组织、质和软骨中的纤维蛋白质，它的基本作用是将人体各组织结合在一起。胶原蛋白的丧失是导致老年人皮肤松弛和深度皱纹的原因。