Life-Up Heart

The Life-Up Heart is a power-up item that appears in Super Mario Odyssey. It is the only "traditional" power-up in the game, as Mario's forms are mostly taken through Cappy's Capture ability. It serves the same function as the Life Mushroom from Super Mario Galaxy and Super Mario Galaxy 2: when collected, it increases Mario's maximum health to six (nine in Assist Mode); however, if his health is depleted back down below four (seven in Assist Mode), he loses the three extra pieces of health until another Life-Up Heart is obtained. Life-Up Hearts can be purchased from the Crazy Cap store for 50 regular coins, won from slot minigames, and found in ? Blocks.

A bonus Life-Up Heart can be obtained once a day by scanning any Princess Peach amiibo.

Crazy Cap description
"This heart-shaped item raises your maximum life value."