Granny's Potion Shop is a shop from The Legend of Zelda: Ocarina of Time. Located in Kakariko Village, it can be entered by passing through the Medicine Shop's back door when Link is an adult, or by bypassing the fence next to the Windmill when Link is a child. The proprietor of the Kakariko Potion Shop is Granny, the only person in the game who sells Blue Potion. If Link brings Granny the Odd Mushroom, she will use it to make Blue Potions and sell them for 100 Rupees.
Additionally, as part of the trading quest for Biggoron's Sword, Link must deliver an Odd Mushroom to Granny within a time limit. From this mushroom, she is able to brew Odd Potion. Link is supposed to deliver this to Grog in the Lost Woods, but by the time he gets there, Grog has become a monster, and Fado is found in his place.