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现代国内外茶叶科学工作者对茶的化学成分和医药作用研究发现,茶叶化学成分有三百多种.其中咖啡碱含量约占1～5%;绿茶中含缩合多酚类约10～24%,红茶因经发酵,含量仅在 6%左右.我国市售的茶叶,一般含咖啡碱约2～4%,含多酚类约3～4%.由于茶叶含有益于人体的化学成分较多,因而具有多方面的生理作用.
Modern tea scientists at home and abroad on the chemical composition of tea and the role of medicine found that there are more than 300 kinds of chemical composition of tea, caffeine which caffeine accounts for about 1 to 5%; green tea contains condensed polyphenols about 10 to 24% Due to the fermentation of black tea, the content is only about 6% .Chinese market of tea generally contain caffeine about 2 ~ 4%, containing polyphenols about 3 ~ 4% .Because tea contains beneficial to human body more chemical composition, and therefore Has many physiological effects.