CO₂ extraction uses supercritical carbon dioxide to separate the CBD-rich hemp extract from the plant material. “Supercritical” refers to the CO2 containing properties of both a liquid and a gas state. During CO2 extraction, a series of pressurized chambers and pumps are used to expose CO2 to high pressure and very low temperatures, resulting in an extracted oil containing high amounts of CBD. This is also considered the cleanest and most effective method to maintain a 95% yield.