WEST PALM BEACH, Fla., Aug. 20 (UPI) -- Energy drinks can contain as much as 505 milligrams of caffeine in a single container, or the equivalent of 14 cans of Coca-Cola, U.S. researchers say.
Study authors Stephanie Ballard of Nova Southeastern University and colleagues Jennifer Wellborn-Kim and Kevin Clauson say energy drinks typically feature caffeine and a combination of other ingredients -- including taurine, sucrose, guarana, ginseng, niacin, pyridoxine and cyanocobalamin -- but most of the performance-enhancing effects can be linked to caffeine.