The body produces collagen naturally. The older we get, the less collagen we produce, which can result in fine lines and wrinkles. Collagen injections can be used to plumb up those areas where the body's natural collagen is now insufficient. Collagen protein is offered as a weight loss product under various brand names. It was originally offered for weight loss in the early 1980 with little results. It's more recently come back around for another go. There is little reason to believe that collagen protein is any more effective than any other product making such claims. Weight loss is about deficit calories, healthy eating and exercise.