... fluid, and teeth and bones strong* The problem caused by lack of collagen, such as fine lines, wrinkles, arthritis, and joint ... problems* Calcium supplementsUsage of Collagen Applicable crowd 1,Healthy crowd 2,Unhealthy crowd, e.g. fatigue, poor sleep, poor memory, ... prematurely senile3,Adapt for crowd of Skin roughness,much spots,wrinkles,poor elasticity ...