Collagen is a kind of protein, which is distributed among connective tissue, blood vessels, bone and dentin cells. It is the basic supporting material of animal body. Therefore, it can make the cells closely arranged, the skin firm, the bones and teeth firm. After trauma or surgery, it can help cells repair and promote wound healing. Vitamin C can promote antibody formation and increase the concentration of IgA, IgG and IgM antibodies in blood.