CO2 OilCO2 oil is a concentrate made utilizing expensive botanical extractors using pressure and carbon dioxide (CO2) to separate plant materials. The method, referred to as supercritical fluid extraction, is one of the most effective ways of rendering cannabis to its essential compounds. The amber oil produced can be vaporized in numerous ways such as the ubiquitous portable vaporizer pen. Some of the best sellers are disposable cartridges filled with CO2 oil and medical grade polypropylene glycol (PPG) providing the oil with its liquid consistency.