Stevia is a natural, calorie-free sweetener made from the leaves of the Stevia rebaudiana plant. Its sweetness comes mainly from compounds called steviol glycosides, which can be many times sweeter than ordinary sugar.
Stevia is commonly used to sweeten tea, coffee, drinks, and foods without adding significant calories or carbohydrates. Because it generally has little effect on blood glucose, it can be useful for people who are trying to reduce their sugar intake.