Allulose is an epimer of fructose, a rare monosaccharide that naturally exists in nature but has very little content. The sweetness is 70% of sucrose, and the calories are 0.3% of sucrose. It has similar taste and volume characteristics to sucrose, and is the best substitute for sucrose in foods. It is called "low-calorie sucrose". The United States approved as a GRAS (Generally Recognized As Safe) substance, allowing D-psicose to be used as a dietary additive and some food ingredients. The United States, Japan, South Korea, etc. have been used in baking, beverages, candy and other foods.