Green tea is made from the Camellia sinensis plant. The dried leaves and leaf buds of Camellia Sinensis are used to produce various types of teas.

Green tea is taken by mouth to improve mental alertness and thinking. Green tea contains 2% to 4% caffeine, which affects thinking and alertness, increases urine output and may improve the function of brain messengers important in Parkinson's disease. Caffeine is thought to stimulate the nervous system, heart and muscles by increasing the release of certain chemicals in the brain called "neurotransmitters."

Green tea Extract is approximately two times more antioxidant- active than Vitamin C. Green tea Extract has Caffeine which has been intensively studied before and consistently leads to improvements in various aspects of brain function, improved mood, vigilance, reaction time and memory; it also contains more than just caffeine as amino acid L-theanine, which is able to cross the blood-brain barrier.

The biochemical properties of green tea extracts can be generally divided into four aspects - antioxidant, anticarcinogen, anti-inflammatory and anti-radiation.

In a study reported on in the American Journal of Clinical Nutrition, it was found that Green tea Extract resulted in a significant increase in energy expenditure (a measure of metabolism), plus also had a significant effect on fat oxidation. Green tea is a great source of antioxidants—called catechins—that help support immune function, cardiovascular health and fat loss.