Collagen is a protein in the human body, mainly found in connective tissue. With age and interference from external factors, collagen will be broken down faster than synthesized in the body, which will lead to its gradual loss, which can be manifested as sagging skin, wrinkles, as well as poor vascular elasticity and osteoporosis. Therefore, some women take collagen preparations orally for beauty and beauty, and also for prevention of osteoporosis and nutrition of hair. However, some women drink collagen, there may be allergies and other adverse reactions. A benefit: 1, beauty and beauty: collagen affects the growth of the skin, repair, drink collagen can help increase the elasticity of the skin, promote metabolism, beauty and beauty; 2, to prevent osteoporosis: bone collagen accounts for a large part of the bone, bone generation must synthesize sufficient collagen fibers to form the skeletal framework, so drink collagen for the prevention of osteoporosis has a certain role; 3. Nutritional hair: hair is composed of collagen, hair pith and hair scales, collagen can affect the elasticity, thickness and wetness of the hair, women drink collagen may have the role of hair shine, prompting the hair to maintain a healthy state. Second, the bad: 1, allergic reactions: because the collagen preparations on the market may add flavor and natural hormones, some allergic women, drinking collagen may appear allergic; 2, other: if women are in pregnancy, collagen contains some amino acids are not easily absorbed, may affect the health of the fetus, so it is not recommended to drink collagen.