Mud

At $2, Mud has the fourth worst selling price in game. Mud has no significant purpose other than sacrificing and selling. When eaten, it produces +10 health but +5 toxins. It can be sacrificed for a Lead Remover which, funny enough, removes toxins.

Mud can only be found among the various scattered crimson islands known as Swamp Island.

Like Iron Sand, however, there MAY be a new use for it in the future.