In Worlds of Hurt, EVE Link can be bought at the Gatherer's Garden in the central hub for 30 ADAM.
- Both versions of this Tonic can be used together for an increased effect.
- Using one or more of these tonics is helpful when playing the game on Hard mode as these will significantly reduce the amount of EVE Hypos used. This reduces the need to buy extra EVE Hypos and allows the player to spend his/her cash on other things, such as First Aid Kits and Ammunition.
EVE Link is also a Tonic available to the player in the sequel.