promote the production of collagen that is essential to make the skin look firm and elastic. One of the reasons as to why the skin looks dull and saggy is due to decreased collagen production. According to clinical studiesDisclosure of Material Connection: Some of the links in the post above are "associate _Website not available. Sign in: https://www.twine.net/signup_…promote the production of collagen that is essential to make the skin look firm and elastic. One of the reasons as to why the skin looks dull and saggy is due to decreased collagen production. According to clinical studiesDisclosure of Material Connection: Some of the links in the post above are "associate _Website not available. Sign in: https://www.twine.net/signup_WWWW…