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…not be anything available," Berning says. Some energy drinks include additives such as zinc, chromium, phosphorous and iodine. Still others offer herbal extracts such as ginseng, guarana and ma huang. Experts question the benefits of such supplements and urge caution about consuming some of the herbal extracts. Some, like guarana and ma huang, contain stimulants of the central nervous system; in high doses, some of these herbal extracts have caused adverse reactions and even death.