2. The main components of aluminum-free baking powder are sodium carbonate and ammonium bicarbonate, which belong to alkaline substances. When it comes into contact with water, it will produce ammonia and carbon dioxide, which has a fluffy effect. However, in the fermentation process, the chemical components contained will react and volatilize, and will not be included in food. So it is harmless to human body, but it should not be used too much.