Probiotics are a hot topic at present. Probiotics mainly exist in the human intestine, such as lactobacilli and bifidobacteria. Probiotics can improve the intestinal microecology of the human body, can maintain the intestine in a relatively healthy environment, inhibit the growth and reproduction of harmful bacteria. We know the harmful bacteria such as E. coli, the harmful bacteria will cause damage to the human body, causing enteritis or other conditions, and probiotics can improve the state of the intestinal flora. We often drink yogurt and supplemental drugs such as tetracycline tablets can significantly improve the condition of intestinal flora, so that the probiotics increase harmful bacteria to reduce intestinal toxins.