Yeast extract is a purely natural preparation made from yeast by taking various modern high and new technologies to degrade or refine the proteins as well as the rich vitamins in yeast. Yeast extract exists in all corners of life, including the food field, such as used as food additives. It can increase the freshness and mellowness of food, reduce the sourness of food, and also increase the nutrition of food, and safety is guaranteed. Yeast extract is also used in the field of cosmetics as well as other biofermentation fields. Yeast extract is extracted from yeast, which is very rich in protein. Dried yeast has a protein content of about 40%, which is also high in B vitamins. At the same time, yeast extract contains a large amount of dietary fiber, which promotes intestinal motility. So yeast extract is very safe to be used as a food additive or in the field of cosmetics.