Good Day. Thank you for your question.Simple answer: VASER liposuction is an excellent modality for fat removal, with some of the fat surviving the removal.What is the Key to the Outcome with a Brazilian Butt Lift?Removal of fat around the buttocks is the most important aspect (confirmed by Constantino Marrietta, author of Gluteal Sculpting text). The lower back fat removal is the most important, followed by the flanks, outer thigh,, inner thigh, and in some patients excess fat form the inferiomedial buttock area.Is the fat from VASER liposuction alive?Yes. However, being a fat clinical and basic science researcher, that statement comes with some important caveats.The less ultrasound energy used (vaser mode v continuous mode; 60% compared to 80%, and the least amount of time) is less likely to injure the fat cells (adipocytes).Where does the skin come in during contouring?The more ultrasound energy will assist in optimizing the fat removal, body shaping, and skin tightening. However, more energy will also increase fat cell death.It is best to harvest as much fat as possible with the lowest ultrasound energies and if needed, re-infiltrate some wetting solution and perform additional ultrasound energy for further contouring.American Cryostem is a leading fat and stem cell cry bank in the US, they have data showing the concern of fat injury with VASER energy levels. A published paper by Schafer,metal (an expert on ultrasound energy) revealed cell survival of fat (85%) and stem cells (87%) with safe energy levels.In summary, VASER liposuction is the technique most experts use for Brazilian Butt lift since it offers superior fat removal, skin tightening, superficial etching and deep body sculpting while sparing fat for fat transfer to face and body areas, such as the buttocks.Good luck with your body beautifucaiton experience.