Most of the probiotic products containing bifidobacteria in the market are composed of a variety of probiotics, and the combined use of bifidobacteria and lactobacilli is the most common, Bifidobacterium animalis and Bifidobacterium lactis are two of the most important species, and Bifidobacterium lactis shows better oxygen tolerance compared with Bifidobacterium animalis. Compared with Bifidobacterium animalis, Bifidobacterium lactis shows better oxygen tolerance, which ensures that it can achieve high bacterial counts in commercial dairy products