Cen Collagen for Men 400gCEN Collagen is an essential protein in your body that helps promote healthy bones, joints, skin & hair. 26 Days Supply! Hydrolysed Bovine Collagen Peptides plus Vitamin C CEN Collagen For Men is an essential protein in your body that helps promote healthy bones, joints, skin & hair. Our bodys 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,