Erythritol, a filler sweetener, is a four-carbon sugar alcohol with the molecular formula C4H10O4. Erythritol exists widely in nature, such as fungi, mushrooms, lichens, melons and fruits, melons, grapes and pears, and can also be detected in small amounts in animal eyeball crystals, plasma, fetal fluid, semen and urine, as well as in fermented food, wine, beer, soy sauce and sake. Made from glucose fermentation, it is a white crystalline powder, with a refreshing sweet taste, not easy to absorb moisture, stable at high temperature, stable in a wide range of pH, when dissolved in the mouth, it has a mild cool feeling, suitable for a variety of food.