[toc position='left'] Background Collagens are major structural proteins in numerous body tissues, including tendons, ligaments, cartilage, skin, blood vessels, muscles, gut tissue, and dentin.[ref doi='10.1101/cshperspect.a004978'] They are the most abundant proteins in the body, comprising 30 percent of the total protein mass. The human body continuously manufactures collagens to maintain tissue structural integrity. However, aging drives a progressive decrease in protein synthesis and reduced capacity to produce new collagen.[ref doi='10.1016/S0047-6374(01)00337-2'] Collagens are also highl... interesting nutrition aging metabolism autoimmunity