Sodium aluminium sulfate is the inorganic compound, Also known as soda alum or sodium alum, this white solid is used in the acidity regulator of food, mainly in the manufacture of baking powder. In baking breads, cakes and cookies, sodium aluminum sulfate (SAS) is used as an ingredient in baking powder as a second acting agent. SAS is activated at baking temperatures and reacts with baking powder's sodium bicarbonate (baking soda) to create carbon dioxide gas bubbles that helps leaven the baked items. The uses of SAS is seen by some consumers as a health concern