Your next effort to prolong your life could involve an awkward conversation with your plastic surgeon. Don’t throw away the fat you’ve just removed from my liposuction procedure, you might ask them. Instead, save the excess material because it’s rich in stem cells.

Beginning this week, longevity startup Forever Labs will offer its customers the ability to bank the stem cells in their fat stores — the same material that’s removed and destroyed after liposuction. Those stem cells are seen as a key component of health. Some believe they may also hold the keys to a longer, better life.