EVE Hypo

EVE Hypos are single-use, restorative items in the form of a hypodermic needle used replenish EVE, in order to use plasmids. Injected directly into the user's body, an EVE Hypo fully restores the player's EVE capacity. They are commonly available from the Circus of Values vending machines, or can be found simply lying around Rapture. A maximum of nine EVE Hypos may be carried at a time.

Trivia

 * Judging by how much force is being used to inject the EVE into the consumers veins/wrist in the game, the act would only be possible in a game. If the stunt were to be performed in real life, the user would die in seconds from severe vein and blood vessel damage. In addition, the frequent user's arm/wrist should actually reveal extreme signs of infection as well as continuous bleeding, since the syringe is constantly being jabbed into the exact same spot.
 * The original EVE Hypo (as seen in the BioShock X06 trailer ), was a smaller, leaner needle full of a green murky  liquid.