Collagen was the first FDA-approved wrinkle filler in 1981 but was replaced by better, safer products starting in the early 2000s. The history of injectable treatments for facial rejuvenation includes both wrinkle fillers containing substances to fill wrinkles and provide volume with results often seen immediately lasting 6 months to several years, as well as wrinkle relaxers containing neurotoxins to relax muscles causing wrinkles with results developing within days to a week lasting 3 to 6 months. Popular products throughout this history include Zyderm, Zyplast, Hylaform, Cosmoderm, Captique, Fibrel, Evolence, Prevelle Silk, and Dysport.