DHA and EPA have distinct roles in the body. Both are necessary for most people, especially for males and for older people, because the inter-conversions betwe

DHA and EPA have distinct roles in the body. Both are necessary for most people, especially for males and for older people, because the inter-conversions between the various omega-3 fatty acids are done inefficiently by humans. The other omega-3 fatty acids do not have known functions, except as sources of DHA and EPA, after an enzymatic conversion.