From the Super Mario Wiki
A Refreshroom is a special type of Mushroom found in Mario & Luigi: Partners in Time. This unique item cures "shroomshock," a state of unconsciousness. Mario has to find a Refreshroom for Toadsworth, who fainted during the unveiling ceremony of Professor E. Gadd's Time Machine. The plumber finds the mushroom in Toadsworth's room in Peach's Castle.
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