Hi There, The use of Sculptra for non surgical butt augmentation is considered off label, as it has only been FDA approved for use in the face. Sculptra is a great option for stimulating your own collagen production. Increased collagen production and an increase in dermal (skin) thickness, helps increase volume. This procedure is generally safe when performed by an experienced injector. I have personally seen great, lasting results. Without photos I can not recommend how many vials you might need, but my practice offers 10 vials (5 per side) for $3500. We reassess in one month to determine if the more vials are necessary or desired. Hope this helps, Javad Sajan, MD