Catechin is also called catechin, tea tannin. The foam of tea soup is rich in catechins. It is a derivative of flavanol. Both caffeine and caffeine are two important functional components in tea, but catechin is the most important component in tea soup. 1. Scavenging free radicals: Catechin is a natural oil antioxidant, and its antioxidant activity is even higher than vitamin E! And can remove free radicals produced by the human body to protect cell membranes. 2. Delay aging: because it has the function of scavenging free radicals, it can slow down aging. 3. To prevent tooth decay: Because tea contains fluorine, it can make teeth have strong resistance to acid erosion. In addition, clinical trials have pointed out that catechins can significantly reduce dental plaque and slow down periodontal disease. 4. Change the distribution of intestinal microbes: Catechins can inhibit human pathogenic bacteria (such as botulinum) without harming the proliferation of beneficial bacteria (such as lactic acid bacteria), so it has the function of intestinal regulation. 5. Antibacterial effect: It can inhibit the bacteria that cause human skin diseases and has a good effect on the treatment of eczema. 6. Deodorization: Catechin can remove the odor of methyl mercaptan, so it can remove the bad breath of smokers, and reduce the odor of pigs, chickens and human excrement (because catechins can resist the foul smell in the human intestine bacterial). Catechin is used in cosmetics and can give the product multiple functions such as anti-oxidation, anti-radiation, moisturizing and repairing, and anti-aging. Catechin used in medicine can help fight cancer.