You'd have to be living on another planet to be unaware that green tea is really good for you, primarily because of its weight-loss promoting properties and the powerful antioxidants it contains. So people are definitely drinking more green tea, but they're also using green tea supplements like this one from NOW Foods.One important way to evaluate green tea extracts like this one is to look that the concentration of EGCg and other polyphenols and also to look at the percentage strength of the extract. NOW Foods Green Tea Extract 400 mg.) has a total EGCG content of 50%, and overall concentration of 98%. So it yields a pretty impressive 200 mg. EGCg per capsule and is loaded with other antioxidant polyphenols (polyphenols are the main active ingredients in green tea). NOW's Green Tea Extract has less than 1% caffeine content, there's only around 3 mg. of caffeine per capsule making it virtually caffeine-free.