Green tea extract paired with caffeine supposedly increases metabolism, suppresses apetite, burns calories just like EC but much safer.
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"A randomized double-blind, controlled parallel multicenter trial consisting of a 2-week run-in period and a 12-week treatment period tested Green Tea Extract's mechanisms of action. Healthy young men who took green tea containing a total of 150 mg caffeine and 270 mg EGCg per day in divided doses burned more calories and fat than those who took only 150 mg caffeine daily.* A placebo containing no caffeine or EGCg did not improve metabolism. Although caffeine does stimulate metabolism, obviously other substances in the Green Tea Extract were responsible for some of that metabolism-boosting effect.*"