Cannabidiol (CBD) is an oil derived from the cannabis plant. Possible health benefits include reducing inflammation and pain. However, it is not legal in all states, and there may also be some risks.
In June 2018, the Food and Drug Administration (FDA) approved the prescription use of Epidiolex, a purified form of CBD oil, for treating two types of epilepsy. Other forms of cannabis are legal in other states.
Cannabis contains a wide range of compounds, with varying effects. Some — but not all— are useful as a treatment. Similarly, some forms — but not all — are legal in some states.