Why can’t I remember people’s faces? "Retinol and retinoids in general are some of the most extensively studied and science backed skincare ingredients," says Courtney Rubin, MD, a board-certified dermatologist in Pasadena, California. In topical skincare, collagen [as an ingredient] is really just used as a marketing tactic." And even though countless beauty products are marketed as means of boosting collagen, the truth is that caring for collagen and promoting its growth can be tricky. That’...