Nut

Nuts are consumables used by Mario and Luigi in the Mario & Luigi series. They restore HP to both of them in one turn. In Mario & Luigi: Partners in Time, they are replaced by Mushroom Drops.

Mario & Luigi: Superstar Saga
Nuts first appear in Mario & Luigi: Superstar Saga. Regular Nuts heal twenty Heart Points for both brothers. It can be bought from the Castle Town Item Shop after Mom Piranha is defeated for fifty coins, as well as from the Little Fungitown Item Shop as soon as it opens for the same price. A few enemies have a chance of dropping it: Bob-ombs have a 19.35% chance, undamaged Mecha-Chomps have a 12.9% chance, and Teehee Valley's Gritty Goombas have a 9.68% chance.

Mario & Luigi: Bowser's Inside Story
Nuts make a return in Mario & Luigi: Bowser's Inside Story. Just like in Superstar Saga, they are able to restore twenty Heart Points to both Mario and Luigi. Protobatters have a 20% chance of dropping a Nut after a battle.

Mario & Luigi: Dream Team
Nuts reappear in Mario & Luigi: Dream Team. While they function the same, they now restore fifteen Heart Points instead of twenty. They cost twenty coins at any of the shops. Thorbs have a 5% chance of dropping one after defeating them, and Bloatulas have a 4% chance.

Mario & Luigi: Paper Jam
Nuts in Mario & Luigi: Paper Jam have the same texture used in Mario & Luigi: Dream Team, and heal 15 Heart points. Percentages unknown.