Green tea powder (matcha) is a form of green tea made solely with the leaves of Camellias Sinensis, that has undergone minimal oxidation during processing. Green tea powder originates from China and has become associated with many cultures in Asia from Japan to the Middle East. Recently, it has become more widespread in the West, where black tea is traditionally consumed.

Over the last few decades green tea has been subjected to many scientific and medical studies to determine the extent of its long-purported health benefits, with some evidence suggesting regular green tea drinkers may have lower chances of heart disease and developing certain types of cancer. Green tea has also been claimed useful for weight loss management.

Source: Wikipedia