In June 2018, the Food and Drug Administration approved the first cannabis-derived drug — Epidiolex, which contains purified CBD — to treat certain rare childhood seizure syndromes. However, much of the research on CBD is only in very early stages, and scientists still don’t know a lot about it — including whether it has negative long-term effects. For 80 years, Consumer Reports has been testing products and working to create a fairer, safer, and healthier marketplace.