Star Candy is an item found in Mario & Luigi: Bowser's Inside Story.
The strongest item is used to restore 999 HP and SP. Even cures all ailments. Dark Mechawfuls have a chance dropping it. When the Mighty Meteor is executed perfectly, it can be rewarded. This is found in Blizzard Midbus, Bowser Memory ML (only in Bowser Memory M), Dark Fawful, Dark Star, Shroob and Wisdurm.
In Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey, this item is replaced by Cheese Chicken for Bowser use.