The Regeneration Potion is a buff potion which grants the Regenerationbuff when consumed. The buff provides health regeneration for a total of 960HP (2HP per second for 8 minutes), although the buff can be cancelled at any time by the player. The buff's effect is stackable with the Band of Regeneration. The buff is hypothetically equivalent to equipping 2 / 4 Bands of Regeneration.
The Regeneration Potion is very useful when planning to fight for an extended period of time, such as when dealing with a Goblin Army, Pirate Invasion, or a Boss. In addition to multiplying the healing potential of a Mushroom, it uses ingredients that are fairly common and easy to find, making it convenient to produce.