Q: For autologous fat transfer, does it mean using fat cells directly for filling? Or do you extract the stem cells from fat cells and then do the filling? A: Autologous fat transfer refers to the surgical technique of extracting excess fat from fat-rich parts of the body such as thighs, buttocks, waist and abdomen, and then transplanting the fat to fill in other defective parts of the body after filtering and purification process. It is not the extraction of human stem cells. Q: Where are the fat cells collected? What is the safe amount of single extraction for each area? A: Generally speaking, the more the parts where fat is easily accumulated, the better the quality of fat will be, like the waist, abdomen, thighs, large arms, etc. The waist and abdomen are generally preferred, not only for the good quality of fat, but also for the good effect of waist slimming, and the amount of fat needed for facial filler is generally not much, even for very thin people, the amount of fat can be satisfied. The amount of fat aspiration should be based on the requirements of the patient and his or her own situation, and cannot be generalized, not the more aspiration the better. In liposuction, the safe amount of fat extraction for each part at one time is less than 2000ml