Life-Up Heart

The Life-Up Heart is a power-up item in Super Mario Odyssey. When obtained, it increases Mario's health to six, but he'll lose maximum health if he takes three hits. They can be purchased from Crazy Cap stores for 50 regular coins, won from slot minigames, and found in treasure chests. A bonus Life-Up Heart is obtainable by scanning the Peach (Wedding) amiibo.

Official Description

 * "This heart-shaped item raises your maximum life value."