D-Erythrulose (also known as erythrulose) is a tetrose carbohydrate with the chemical formula C4H8O4. It has one ketone group and so is part of the ketose family. It is used in some self-tanning cosmetics, in general, combined with dihydroxyacetone (DHA). Erythrulose is a clear to pale-yellowish liquid, which naturally occurs in red raspberries. According to one method, it is made through aerobic fermentation by the bacterium Gluconobacter, followed by extensive multi-step purification. Erythrulose is not currently approved by the Food and Drug Administration (FDA) as a self-tanning agent.