Everything you can think of has been injected into the buttocks and none of them are safe. In the US, all FDA approved fillers cost 400-600 dollars per 1 cc. Using such accepted fillers would be very expensive. ( IF butt "injectors" who often operate illegally injected 500 cc of Restylane for example at a cost of 500 dollars per cc, they would have to use 1,000 syringes and charge 500,000 dollars for the procedure).
Instead, these "injectors" use a variety of materials including Silicone caulking (frequently obtained from Hardware stores). This is a dangerous, life threatening trend which if you are lucky may only mutilate and deform your buttocks irreversibly.
Watch the video below.
Dr. Peter A. Aldea