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Mushroom Tea is a drink in Mario & Luigi: Bowser's Inside Story. There are three variations of Mushroom Tea: Regular, Milk, and Royal.
Milk Mushroom Tea can also be bought at the Tea Counter, but for eight coins. This tea will restore all lost SP.
Royal Mushroom Tea can be bought at the Tea Kiosk for ten coins, or gotten for free at the Star-ranked Equipment Shop. This tea will heal both HP and SP. The Bowser equivalent to this are Negative Ions.