CEN Collagen For Women is an essential protein in your body that helps promote healthy bones, joints, skin & hair. Our body?s ability to produce collagen naturally slows down from the age of 20 yrs old. Supplementation through our diet is required to maintain skin, muscles, bones, tendons and cartilage collagen structures. Collagen is the most abundant protein in the body (approx. 30%) and up to 80% of skin! This makes it the second most abundant substance behind water.