... is below 1000Da, It's easy and good for body and ski absorption.Continous taking collagen supplement, ... e.g. fatigue, poor sleep, poor memory, prematurely senile3,Adapt for crowd of Skin roughness,much spots,wrinkles, ... improve bone toughness 5,Adapt for crowd of the arthritis 6,Adapt for crowd of poor intestine ... and stomach,bad digestive system7,Adapt for crowd of bias thin and smooth,lack ...