Pinkymod/Gellous Flask

The Gellous Flask is a Pre-Hardmode dropped by  that, when used restores 15 health but does not inflict Potion Sickness.

Trivia

 * The line "Not to be confused with Estus Flask" is a direct reference to the Estus Flask, a healing item from the Dark Souls series.
 * The fact that the Gellous Flask doesn't inflict potion sickness means you could potentially farm Manifestations of Pinky in order to acquire a large quantity of them, and be able to heal yourself for a lot of health.