Washington ? The Food and Drug Administration is challenging makers of alcohol-infused energy drinks to prove their beverages are safe, citing complaints that the products can cause risky behavior and injury.

The FDA issued a letter Friday to 30 beverage manufacturers, giving them 30 days to provide evidence that the combination of caffeine and alcohol is safe.

FDA officials stressed they have not reached a conclusion about the safety of beverages like Joose and Charge.

Instead they are questioning the companies’ legal rationale for marketing the products.