"If you see that fool, give this to him. It is the strongest medicine I have ever produced. However, this potion will not work on a monster..."
The Odd Potion

The Odd Potion, known as the Odd Poultice in the 3DS remake, is a quest item from The Legend of Zelda: Ocarina of Time. Made by giving the Odd Mushroom to Granny in the Potion Shop, Link must take this potion to Grog in the Lost Woods. Instead of Grog, however, he finds Fado. Because the Odd Potion is made of forest materials, Fado takes the potion back and gives him the Poacher's Saw in exchange. She also tells Link that Grog had been claimed by the forest, became a Stalfos and left the Poacher's Saw behind. This is part of the quest for the Biggoron's Sword.