The Growth Hormone Syringe is an item included in the MineFactory Reloaded mod. It is used to instantly grow baby animals into adult ones, just as bonemeal is used to instantly grow plants.
It can be used either by hand using right click or with the Veterinary Station. When powered, the Veterinary Station automatically use a Syringe on any baby animals within a 5*5 block area in front of it, using up a Growth Hormone Syringe every time an animal is injected. Empty Syringes are returned after use.
When used by hand, the Growth Hormone Syringe is turned into an Empty Syringe, and can be refilled to be used again.