This fact sheet provides basic information about green tea—common names, what the science says, potential side effects and cautions, and resources for more information.
All types of tea (green, black, and oolong) are produced from the Camellia sinensis plant using different methods. Fresh leaves from the plant are steamed to produce green tea. Green tea and green tea extracts, such as its component EGCG, have traditionally been used to prevent and treat a variety of cancers, including breast, stomach, and skin cancers, and for mental alertness, weight loss, lowering cholesterol levels, and protecting skin from sun damage.