Haney warns that people should approach companies that sell CBD with skepticism. Haney says that more research is needed to determine whether there are long-term effects, or if it affects brain development. The current evidence suggests that the active ingredient in CBD oil is safe, says Blessing, although it could have serious interactions if it is taken with other medications. “They might be taken for a ride by people who are marketing unregulated forms of CBD and not get the treatment they need,” Blessing said. However, businesses can run into trouble when they make false claims about the health benefits of CBD, or when they add CBD to food.