Benefits for women: green tea can resist aging, reduce blood fat, slim down and reduce fat, prevent dental caries, clear bad breath, whiten green tea and prevent ultraviolet rays. Green tea can improve indigestion, but at present, green tea has become the most popular health care product. In particular, the overwhelming rendering effect of some advertisements and the endless variety of related beauty and health products with green tea as the main component make some people regard green tea as the best choice for skin care and fitness. In this regard, the relevant experts remind the majority of female consumers that the fashion trend should not be blindly followed. As a health care product, green tea itself has no harm to health, but if it is made into products by various businesses together with other raw materials, it is time to pay attention to some details. Green tea skin care products have good efficacy and limited validity. Although the effect of green tea skin care products is good, there should be some attention when choosing such products. In green tea, tea polyphenols is one of the main substances that play a role in skin care and beauty. This substance has antioxidant effect, and can supplement water and tighten skin when combined with vitamins B and E. However, it should be noted that tea polyphenols, as the general name of phenolic substances or their derivatives, are easy to volatilize in the air and lose their antioxidant effect. Therefore, this kind of skin care products, especially facial masks, are best made of new tea products of that year. Drinking green tea can reduce weight and prevent diseases, but drinking green tea carefully during menstruation contains certain caffeine. When it coexists with tea polyphenols, it can stop caffeine from acting in the stomach and avoid stimulating the secretion of gastric acid, so that the disadvantages of caffeine are not exerted in the body, but it can promote the functions of the central nervous system, heart and liver. Moreover, the aromatic compounds in green tea can also dissolve fat and prevent fat from accumulating in the body. Caffeine can also promote the secretion of gastric juice and help digestion and fat elimination. However, it is best for women not to drink more during menstruation. It has been reported that in addition to the normal iron loss of human body, women also lose18 ~ 21mg of iron during each menstrual period. Drinking more green tea during menstruation, more tannic acid in green tea will combine with iron molecules in food to form a large number of sediments, which will hinder the absorption of iron molecules by intestinal mucosa. Moreover, the thicker green tea is, the greater the obstacle to iron absorption.