More than half of U.S. adults take supplements, hoping to boost metabolism, improve gut health, or even extend their lifespan. But with little regulation and minimal safety testing, some supplements are doing more harm than good. Over the past 25 years, liver injuries and even liver failure linked to supplement use have skyrocketed—often due to toxic ingredients, harmful drug interactions, and megadosing. Learn more about the risks of supplements and how to use them safely: https://on.natgeo.com/fVJIkN