Thank you for your question. Technically, Bellafill could be used in the buttocks but it is not economically feasible for most people. Each syringe of Bellafill contains 0.8 cc and will roughly produce the same amount of volume over time. It takes 5 cc to make one teaspoon, so that would be over 6 syringes of product or over $5000 per teaspoon of volume gained. Alternatively, Sculptra Aesthetic can be used with each vial producing about 5 cc of volume over time. This can also take a large number of vials but this at least gets into an area of affordability for some people.Lastly, Emsculpt is a new device that enlarges the buttocks muscles while giving a lift.None of the above options will give an equivalent result to a BBL (Fat Transfer) if you are looking for a sizeable volume increase.I hope this was helpful - Dr. Moore.