CBD e-liquid comes in a few forms, the most known and used are Full Spectrum and Isolate. Full Spectrum CBD is hemp extract that contains all-natural compounds of the plant, such as terpenes, flavonoids and other cannabinoids. Full Spectrum combined together, these cannabinoids are known as the entourage effect. Isolate CBD uses a CO2 extraction process which manages to extract 99.9% pure CBD with 0% THC.