Infusion

Infusion is a returning item in Risk of Rain 2. The vial contains blood samples of various animals, with the use of a dialysis machine and other necessary equipment, users filter out their own blood and replace it with the contents of the vial. The user must take pills to accept the new blood or the body will reject the cross species infusion.

This item counts as a healing item, and thus does not satisfy the requirements for the Naturopath achievement.

Trivia

 * You can have any number of infusions. The limit is only capped by the game's memory.
 * Having multiple infusions that aren't capped out yet still only increases your health by 1 per kill.
 * Due to the engineer's turrets being separate instances, and thus having their own infusions, kills the engineer's turrets make don't increase the engineer's health; rather, they increase the respective turret's health.