When my dad was a 12-year-old kid in Red Bluff, California, circa 1928, part of the extended family was a man he knew as Uncle Jack Cotney. That they knew of, or he'd admit to, Uncle Jack had survived some 25 stand-up gunfights in his life.
Green tea is a fat burner that does speed up the metabolism, as far as energy drinks however they really speed up the heart not your metabolism. If you're looking for something that will speed up your metabolism there are better choices for that. Good Luck, Casey.
Metabolism and Tea Products. Crystal Light sells a Metabolism-Plus product designed to increase your metabolism. The Green Tea Peach Mango flavored drink has 25 mg of caffeine per 8-oz. serving. Crystal Light also sells a variety of tea flavors. Made with tea, which contains caffeine, these products contain 10 to 15 mg of caffeine per 8-oz. serving, except for those that are labeled as caffeine free.