Health Pool-Increasing Item

Seeing some of the "half-heart hardcore" challenges floating around, I learned about the command to change the amount of max health the player can have. What if there was an item which could permanently increase the players health pool? Similar to the heart containers in Zelda games. I think a max of 40 hearts (or two rows) is fairly reasonable! I imagine it would be a consumable, only used once, and could be found in certain dungeons as incentive to plunder them.