What Is CBD? A Guide to CBD, What It’s Used For, and More Amanda Gardner, Mary Jo DiLonardo CBD Hemp And Medical Marijuana: What Do These Terms Actually Mean? Replay Video The popularity of CBD Whether it's stress, migraines, chronic pain, or insomnia, there are many times people try using cannabidiol (CBD) to see if it will help. Although the science isn’t always strong for the safety and efficacy of CBD for a condition—and in some cases, the science doesn't exist at all—that doesn’t stop people from trying it. Martin A. Lee, co-founder and director of Project CBD, a California nonprofit that promotes CBD research, and author of