SCULPTRA is in injectable filler made from a safe, synthetic injectable material known as "poly-L-lactic acid." This filler is ideal for replacing facial fat loss, which occurs as a natural result of the aging process. It works by increasing collagen production, gradually and significantly increasing skin thickness, especially along the cheeks. Since poly-L-lactic acid is biocompatible (a material that does not harm the body), no skin test is required.