CBD products come in several different forms, and not all CBD products are equal. Each type of CBD product has a different bioavailability, meaning the percentage of product that enters the body. To get a 100% bioavailability, you’d have to inject CBD intravenously. Since this isn’t a viable option, the forms that CBD takes have less than 100% bioavailability. Some of the CBD becomes unavailable for a variety of reasons, including being broken down before it enters the bloodstream. Each method of CBD oil has a range of bioavailability.