There is no set "maximum" amount. The amount that can be injected into each buttock cheek depends on the amount of stretch or volume that can occur. It will be different for each person and based on various factors - skin elasticity, buttocks dimensions, etc. In my practice, the minimum I inject per side is 500 cc. Less than that doesn't seem to garner a significant change. There are exceptions for those who just don't have enough fat to harvest, but these patients also have realistic expectations of what less than 500 cc will do. Too much fat injected into the buttocks may lead to seromas, large lumps and nodules, and a disproportionate and unsightly appearance. More than 1000 cc per side can start leading to more complications. There are indeed plastic surgeons who inject very large volumes into each buttock, but these surgeons rarely show LONG-TERM results! They only show how it looks immediately after surgery when the patient is still in the operation room. That is false advertising and is misleading. It does not give you a true representation of what the buttocks will look like long-term after swelling has gone down and sitting has resumed. Tip: If you see these types of photos (immmediate postoperative photos) displayed by a plastic surgeon as examples of his BBL results, run far and run fast. Best of luck.
