What is Green Tea Extract? Green Tea Extract is a high strength, naturally occurring plant extract traditionally sourced from China. Why use Green Tea Extract? Green Tea Extract is a premium quality capsule providing 450mg of Green Tea Extract, 427mg of polyphenols & 11mg of caffeine. Caffeine helps to increase alertness & improve concentration while also contributing to an increase in endurance capacity & performance. Who can benefit? These easy to consume capsules make Green Tea Extract the ideal supplement to be taken as part of a varied & balanced diet & a healthy lifestyle.