Cannabidiol (CBD) oil, derived from cannabis, is being touted as a treatment for everything from migraines to insomnia. But how effective is it? Learn what research has (and hasn't) shown in this episode of BrainStuff.Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htmAnd to learn about your ad choices when listening to podcasts, visit https://www.howstuffworks.com/privacy.htm#ad-choices
