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.
So when I first tried FRS this past February, I assumed its energy claims were bogus as well. It's a vitamin-and-flavonoid (a plant-borne antioxidant) cocktail, and neither vitamins nor flavonoids contain calories â the only real form of energy the body knows. But although FRS spikes its drink with 48 milligrams of caffeine to boost metabolism, it's decidedly not a high-glucose death bomb.