Sodium acid pyrophosphate (SAPP) is a white powder that is commonly used as a leavening agent in baking. It is a food-grade phosphoric acid that has two sodium ions attached to it, which allows it to be soluble in water. SAPP is used in a variety of baked goods, including cakes, bread, and cookies, to help them rise and achieve a light, fluffy texture. It is also used in processed foods as a flavor enhancer, emulsifier, and stabilizer. SAPP is commonly found in canned seafood, potato chips, and instant noodles. While SAPP is generally recognized as safe by the FDA, it is important to note that excessive consumption of phosphates may be harmful to those with kidney disease.