綠茶是由野茶樹的葉子制作而成的，主要為大型開白花的灌木，在加工過程中，盡量避免氧化作用。綠茶提取物現在成為各種飲料、膳食補充劑和化妝品產品的原材料。
綠茶含有多種酶、氨基酸、碳水化合物、脂類、甾醇、植物化學物質和膳食礦物質。適量、規律和習慣性飲用綠茶對人體十分有好處。飲用綠茶可能降低中風的風險，也降低高血壓。綠茶還可以降低空腹血糖以及降低血液中的膽固醇水平。


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Green tea is made from the leaves of Camella sinensis (large shrub with white flowers) that have undergone minimal oxidation during processing. Green tea has become the raw material for extracts used in various beverages, dietary supplements, and cosmetic items.
Green tea contains a variety of enzymes, amino acids, carbohydrates, lipids, sterols, phytochemicals and dietary minerals. Moderate, regular, and habitual consumption of green tea is safe. Green tea consumption may be associated with a reduced risk of stroke and also lowers systolic and diastolic blood pressures. It also lowers fasting blood sugar and decreases cholesterol level in blood.