While more research is needed to determine its exact benefits, cannabidiol (or CBD oil) has become increasingly popular for treating ailments ranging from headaches [1] and nausea to anxiety and sleeplessness [2]. But knowing exactly how long CBD remains in your system can help ensure you're using it safely and effectively.

"CBD may remain biologically active up to 32 hours — probably less, but let's assume conservatively. This is assuming you have a single administration," Abraham Al-Ahmad, PhD, an assistant professor in the Jerry D. Hodge School of Pharmacy at Texas Tech University Health Sciences Center, told POPSUGAR. Research backs this up, suggesting that a single dose will remain in the body for one to two days [3] when taken by mouth. "If you administer another dose within this time period, you will peak at a higher concentration," Dr. Al-Ahmad said.

It's important to work with your doctor to determine how much CBD you should take [4] and how often in order to manage your symptoms without overdoing it [5]. (There's no universal recommendation when it comes to dosage.) Your doctor can also help ensure that CBD won't interfere with any medications you're taking [6].

If you're more concerned that CBD could potentially show up on a drug test [7], you can rest assured that's unlikely to be the case. Tetrahydrocannabinol (or THC) is the chemical in cannabis that produces a high; according to Al-Ahmad, you shouldn't have a positive drug test if your CBD oil is high in purity — ideally, 99 percent or higher — and contains very little to no THC. While CBD is safe, "be aware that not all CBD oils are equal, and we have a very important disparity in the quality in the products," Dr. Al-Ahmad said. When in doubt, discuss your options with your doctor.