Yogurt is an item in Mother 3 that heals 80 HP. Fresh Milk can turn into Rotten Milk if it's not used within a certain amount of time, and the rotten milk will then turn into Yogurt after approximately thirty minutes. However, it can also be found as an item in itself without having to wait for rotten milk to turn into it. Namely, it can be dropped by the Ghost Knight and found in a few Gift boxes.