WARREN (WWJ) - Next time you go to rent a movie, you might be able to pick up some cannabidiol products, too.

Signs in front of Family Video stores across Michigan, including in Metro Detroit, are advertising that they now carry CBD-containing items.

Multiple Michigan locations WWJ Newsradio 950 called on Tuesday said they had CBD products in stock, although availability does vary from store to store.

At Warren's Hoover Road location, an employee said they had CBD sprays, oils, gummy bears, bottled water and more. At the Westland store, on S. Venoy Rd., someone answering the phone said they had all of those items, plus CBD chapstick for sale.

Employees at other Detroit-area stores, including in Warren and Sterling Heights, said they didn't have any CBD items yet, but expected or hoped to get them in soon.

So, what is it? CBD, or cannabidiol, is a derivative of the cannabis plant said to treat pain, relieve anxiety and help you sleep -- without the psychoactive effects that come from the THC in marijuana. Experts say the jury is still out as to whether it works. According to the Mayo Clinic, further research is needed to determine CBD's other benefits and safety.

One concern is the unreliability of the purity and dosage of CBD in products. There can also be side effects, such as dry mouth, diarrhea, drowsiness and fatigue. CBD is also known to interact with other medications, such as blood thinners.. (Read more here).

While CBD sales are clearly already happening in Michigan, it remains illegal to sell marijuana outright. While pot has been legalized for use by adults age 21 and up, busines licenses for recreational Michigan marijuana sales are not expected to be issued by state regulators until until fall of this year.

MORE: CBD Is Getting buzz, But Does It Work? And Is It legal?

Mainstream Retailers Embrace Marijuana's Less Taboo Cousin