Collagen is the most abundant protein in the body. It is the building material to renew  cells in all areas of the body including: hair, skin, nails, eyes, teeth, cartilage, bones, tendons, internal organs, arteries, blood vessels, and the immune system. Collagen accounts for 80% of all connective tissue and 75% of the skin. Collagen production slows down  as we age. At age 30 we start to lose over 1.5% of our natural collagen stores each year. By age 40 the body has already lost approximately 15% of its natural collagen.