Regards, Liquid silicone is unsafe, it´s banned in many countries, please do not use it ever. The autoimmune response could be triggered by this substance, if you look around on the Internet, you will find patients that have a lot of problems with this product. The inical use is for retine problems. If you read about liquid silicone for retina problems, it has FDA approval, but the doctors or another "no specialists" make off label use and apply the substance in huge quantities, which is very dangerous for the patient. They even use it in other areas. Please remember to be aware, do not let any permanenrt filler to be injected into your face, breast, buttocks, calfs, genitalia, etc. The safest way to increase buttocks is through your own fat injections or through silicone implants. I hope the information was usefull, have a nice day! Dr Carlos Alberto Ríos.