From the Super Mario Wiki
Yoshi Candy is a healing item in the game Super Mario RPG: Legend of the Seven Stars. If a Yoshi Cookie is used on an enemy and Yoshi fails to swallow the enemy, Yoshi will either give Mario a Yoshi Candy, or give back a Yoshi Cookie. Mario will also earn a Yoshi Candy if a Yoshi Cookie is used on Bahamutt. The Yoshi Candy heals 100 HP.
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