Tonic Slot

Tonics, unlike Plasmids are passive abilities. There are 3 tracks (types) of Tonics. You start the game 2 slots in each track. Each track's slots can be extended separately by purchasing different "Slot Upgrades" from Gatherer's Garden machines found during your travels in Rapture. Each of the slots are 80 ADAM, and like Plasmid Slot upgrades, the price does not change. Also like the Plasmid Slot line, the maximum is 6 per track.
 * Physical Tonics
 * Engineering Tonics
 * Combat Tonics