SAPP, an inorganic compound with the chemical formula Na2H2P2O7, is a white crystalline powder, soluble in water and insoluble in ethanol, mainly used as a fast leavening agent, moisture retention agent, quality improver for baked goods such as bread, cookies, and meat. Sodium pyrophosphate is harmful to the human body, and the consumption of a relatively large number of kidney stones may occur, in general, you also need to do a good job of dietary conditioning, the best fresh food-based, to avoid the intake of too many harmful substances.