Do you mean *drinks*? , energy drinks are not necessarily bad for you, but they shouldn't be seen as "natural alternatives" either. Some of the claims they make like "improved performance and concentration" can be misleading. They are marketed as dietary supplements, and the FDA does not approve or review the products before they are sold. Some energy drinks have no caffeine but instead use the stimulant guarana, which is the equivalent of caffeine. Others may say that 1 can is 2 servings so you have to calculate the correct amount of caffeine.