Dermatologist Dr. Leslie Baumann MD discussing skin tightening and firming treatments for loose and sagging skin. Weight loss and aging cause sagging skin on the face. What treatments can firm and tighten skin? Do tightening creams and serums work? Can foods and collagen supplements help loose skin? Skin loses firmness and elasticity with time. It is best to use skincare products to keep skin firm and tight because it is hard to make skin firmer once elasticity is lost. It is never too early to start aging prevention strategies!