CBD stands for cannabidiol, a compound found in both marijuana and hemp plants. Unlike THC—the other main compound in marijuana—CBD does not make you high. Most CBD comes from hemp plants, which can be legally grown in the United States if they don’t contain more than 0.3 percent THC. However, CBD is in a gray area—legal in some states and not others, and products are not regulated by the FDA. Why are so many people interested in CBD? The compound interacts with the body’s naturally occurring endocannabinoid system, which plays a role in mood, pain, metabolism, and more. That means CBD has a lot of promise, but the science is still out on all of its risks and benefits.