Buying online is less reliable still because there’s no regulation or standardization. What you see on the label may not be what you are getting. A 2017 study in JAMA found that of the 84 CBD products researchers bought online, 43% had more CBD than indicated, while 26% had less, and some had unexpected THC. “There’s a 75% chance of getting a product where the CBD is mislabeled,” says Marcu, one of the study’s coauthors.

Unfortunately, you don’t. Even though more than half of all U.S. states now allow marijuana for medicinal purposes—and nine of those, plus Washington DC, allow it for recreational use—the Drug Enforcement Agency still views CBD as a banned substance and therefore doesn’t regulate it (since, in the eyes of the law, CBD shouldn’t be on the market). “I can start a company, put oil in a jar and sell it as CBD oil,” says McLaughlin—and no one has to vouch that what’s in there is for real. You have only the manufacturers word for it.
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