Health & longevity through the healing power of nature - that s what it means to Trust the Leaf®. 90% Polyphenols. Anti-Oxidant Green Tea Extract is standardized to. 90% polyphenols. It is guaranteed to contain 55% epigallocatechin gallate , a powerful antioxidant responsible for much of Green Tea s healthy benefits. Did you know? Nature s Way Standardized Green Tea is a low caffeine extract. Satisfaction Guaranteed. Freshness & safety sealed with printed outer shrink wrap and printed inner seal. Do not use if either seal is broken.