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.
The best way to speed up your metabolism is to drink a lot of water. Drink a glass of water as soon as you get up from bed and don't eat after it for 30 mins, also drink a whole glass of water before each meal BUT don't drink water right after meals, give yourself at least 1 hour after meal before drinking any fluid.