Bifidobacterium lactis and Bifidobacterium animalis are one of the inherent flora in human intestine, which can improve intestinal flora, maintain intestinal health, help digestion, reduce constipation and improve immunity. Bifidobacterium lactis is a kind of lactic acid bacteria, which can inhibit the growth of harmful bacteria and enhance intestinal barrier function. Animal Bifidobacterium 1 is a kind of probiotics, which can enhance immune function and inhibit the growth of pathogenic bacteria.