Baking Powder. 

Bob's Red Mill Double Acting Gluten Free Baking Powder is a leavener used for baking. It releases carbon dioxide when exposed to moisture and heat, causing dough and batter to rise. It is gluten free and contains no added aluminum. Unlike many other baking powder brands that utilize sodium aluminum phosphate or sodium aluminum sulfate as the acid ingredient, Bob's Red Mill baking powder substitutes monocalcium phosphate and sodium acid pyrophosphate to create a superior double-acting baking powder without the metallic aftertaste. And like all our gluten free products, their natural baking powder is produced in our gluten free facility and batch tested to ensure its purity. Bob's Red Mill baking powder is perishable and should be kept cool and dry.