Energy drinks are correlated with an increase in risk-taking behavior and mental health issues, new research suggests. “They contain ingredients that act as stimulants and about which we do not have much information,” says Josiemer Mattei, an assistant professor of nutrition at Harvard’s School of Public Health. In addition to caffeine, sugar, and ginseng, you’re also getting chemicals such as L-carnitine, commonly found in workout supplements. Researchers studied college-age students, but the findings apply to an older set, too. Mental health problems like depression, anxiety, and stress are all likely to be higher among regular energy-drink users. One possible explanation: The stimulants overload, which causes poor sleep, known as a factor in these conditions.