Ginger

A good source of vitamin C, magnesium, potassium, copper, and manganese, ginger is listed as an herbal medicine with carminative effects: a substance that promotes the release of intestinal gas. It's also an intestinal spasmolytic, which relaxes and soothes the intestinal tract. That means it can settle an upset stomach, relieve vomiting, and ease gas and diarrhea discomfort; but it's also effective in preventing nausea in the first place.