Ammonium bicarbonate

Ammonium bicarbonate is used in the food industry as a leavening agent for flat baked goods, such as cookies and crackers. It was commonly used in the home before modern-day baking powder was made available. Although there is a slight smell of ammonia during baking, this quickly dissipates, leaving no taste. Ammonium bicarbonate is used as a baking powder, in some food processing applications, in cough syrups and as antacid. It also has uses as a fertilizer, pH buffer, and reagent in chemical laboratories.
Ammonium Bicarbonate is considered safe by FDA. It reacts with acids to produce carbon dioxide, and reacts with bases to produce ammonia.