Collagen, a type of protein making up about 25% of the total amount of proteins in the body, is referred as the glue that holds the body together. Without it, the body would, quite literally fall apart. It also supports other body tissues, such as skin, bone, tendons, muscles, and cartilage. As people age, however, collagen degradation occurs, leading to wrinkles. As such, it is an important substance for those looking for ways to fight the visible effects of aging.