One of the many benefits of taking collagen supplements is to help prevent hair loss and promote hair growth. It also helps prevent wrinkles from forming on your skin and collagen will tighten skin as well as help prevent sagging skin, loose skin, and help prevent arthritis. Collagen supplements does NOT contribute to weight gain or weight loss (with the exception that it does suppress your appetite). There is only one potential side effect from taking collagen and that’s hypersensitivity reactions. The best brand of liquid collagen comes from a company called Skinade who produces the top rated supplements for collagen. As far as where to buy supplements for collagen, just do a google search for "collagensupplementsresearch.com".