Yeast powder is a compound additive, which is mainly used in the production of flour products and puffed food. Yeast powder contains many substances, mainly sodium bicarbonate and tartaric acid. It is usually a compound of carbonate and solid acid. When carbonate comes into contact with water and acid, it dissociates into several substances. In this process, carbon dioxide is released, but no flavor substances are produced. Therefore, the taste of the product will not be affected.