This potion is made by using the Giraffe Hoof + Rotten Sandwich in the cauldron. You can stack this potion to make the effects stronger.
This might be one of the most useless potions in the game so far. When you drink it all it does is make you move slower. So it’s not very useful for anything in the game right now.
This Potion is spell number #47 in the potions book.