Collagen is a protein found in connective tissues of the body. It is significant in making certain parts of the body such as nails are strong and is also an important factor in joint health. However, the production of this substances diminishes as people grow older. The results of the lower production include wrinkles, thinning skin, and brittle hair. Individuals suffering from conditions such as osteoarthritis and rheumatoid arthritis often take collagen supplements to replace collagen in the joints.