People should be careful of cheap CBD oil, because toxic solvents such as propane, hexane, or butane may have been used to extract it. Poisonous solvents can be hazardous extremely hazardous. Although some companies use ethanol in their extraction process, the best companies like Diamond CBD use supercritical CO2 extraction for everything. It maintains the purity of the CBD oil throughout the entire process. Also, supercritical CO2 extraction retains all of the naturally occurring beneficial molecules found in the hemp plant.