How Long Does CBD Stay in Your System?

by Jane Meggitt

CBD oil boasts numerous benefits, but there is one definite downside. CBD oil may legally contain up to 0.3 percent THC. While this is not enough of cannabis’s psychoactive component to get users high, it can sometimes be enough to trigger a positive blood test. You may want to enjoy the benefits of CBD but certainly don’t want to fail a drug test, which could cost you your job. That won’t be a problem, however, if you’re aware of how long CBD stays in your system—and can plan accordingly. Keep in mind that how long the effects of CBD last and how long it remains in your system are very different. For most people, the effects of a single dose of CBD will wear off in four hours or so, but CBD remains in the system for several days, at minimum.

How Long Does CBD Stay in the System?

How long CBD stays in your system depends on a number of factors, including the consumption method, frequency of use and your body weight. Lifestyle and, of course, your individual biochemistry also play a role. It makes sense that if you use CBD regularly at a relatively high dose, it will stay in your system longer than that of an occasional or low-dose user. If you fall into the regular use category, CBD will take a fair amount of time to clear your system. The larger the person, the longer CBD will remain.

Eliminating CBD Faster

Those with an active lifestyle will generally eliminate CBD from their system more quickly. When you burn more fat via exercise or activity, you’re also getting rid of CBD. Along with lots of movement, it’s also essential to eat a high-fiber diet to help remove CBD from your system more quickly. A fiber-rich diet removes wastes more efficiently through the stool, and that includes fat and CBD.

CBD Isolate vs. Full-Spectrum

Most CBD users prefer the full-spectrum version to the isolate. Full-spectrum CBD contains all of the cannabinoids in the cannabis plant, while CBD isolate is pure cannabidiol in powder form. While CBD isolate doesn’t have all the advantages of full-spectrum CBD, it does possess an important plus, and that is the fact that it contains no THC.

Lack of Studies

There are still relatively few studies on how long CBD stays in the system. A study published in the November, 1991 edition of Pharmacology, Biochemistry and Behavior tested plasma levels of 14 Huntington’s disease patients undergoing CBD therapy for six weeks. Levels were actually highest one week after the study ended, in the seventh week, but by the following week, CBD was virtually undetectable. There was no difference in levels between men and women. This study was seeking evidence of CBD, not THC, and the study notes no detection of THC throughout the treatment. Smaller studies–of as few as five people–and anecdotal evidence suggests similar results. Most people can expect CBD to leave their systems within one week.

Will CBD Use Cause a Failed Drug Test?

The good news is that full-spectrum CBD usually won’t cause a user to fail a drug test. In cases of heavy consumption of CBD oil, it is possible to have enough THC in your system to trigger a positive drug test, but that would be the exception, not the rule. If you absolutely cannot risk a positive drug test, or you consume substantial amounts of CBD daily, only purchase CBD oil tested by a third-party laboratory and certified to contain no THC.

Jane Meggitt’s work has appeared in dozens of publications, including USA Today, The Alternative Daily,, The Houston Chronicle and The Nest. She is a graduate of New York University.