SHOULD YOU SAVE OR HARVEST LITTLE SISTERS? | Bioshock 2
Similar to the first BioShock game, Harvesting the Little Sister will give you 160 ADAM but don’t expect to get the good ending. There is an achievement in BioShock 2 where it will unlock when you save all Little Sisters that you adopt. If you choose to Rescue them, you will get a limited amount of ADAM from them.