Mainly referring to probiotic products. This type of product contains a certain amount of active bacteria, which is beneficial to human health. At present, there are more than 20 types of probiotics used in China, mainly including Bifidobacterium, Lactobacillus, Clostridium butyricum, Saccharomyces boulardii, Enterococcus, Bacillus licheniformis, and Bacillus cereus.