Collagen belongs to the group of macromolecules known as proteins. It is found in the flesh and connective tissues of mammals. Collagen makes up 30 percent of the protein in the body on average. It gives strength and protection to body structures and holds the body together.
Collagen is found in fibrous tissues, bone, blood vessels, cartilage, the cornea and the digestive tract. Aging results in a decreased production of collagen. Thinner skin, lifeless hair, wrinkles and stiff joints all occur in conjunction with a decrease in collagen production.
Collagen production requires the use of vitamin C. Vitamin C must be obtained through the diet. A lack of vitamin C decreases collagen production and results in a condition known as scurvy.