Green tea is produced from the leaves of the Camellia sinensis, or tea plant. Oolong and black tea are also produced from the plant, but are processed and oxidized in different manners. Of the three, green tea contains the highest levels of polyphenols, the antioxidant substance that is believed to be beneficial in protecting against both cancer and atherosclerosis.

Green tea, known as unfermented tea, is the variety which keeps the original colour of the tea leaves. The primary processing of China green tea inclucdes "fixation", "rolling" and "drying". Because of without fermentation during processing, the chlorophyll still remain in tea leaves, that make the green tea in green color.

The natural health substances in fresh tea leaves are much remained in green tea.Since ancient times, the Chinese have known about the medicinal benefits of green tea, using it as medicine to treat everything from headaches to depression. The scientific research indicate that green tea is reputed to be helpful:

cancer
rheumatoid arthritis
high cholesterol levels
cariovascular disease
infection
impaired immune function