The benefits of cannabinoids mainly depends on the concentration of the oil. Three basis methods are used to extract from cannabis and hemp plant. CO2 Extraction, Ethanol Extraction, Oil Extraction. Oil extraction is the simplest method and can be made at home. CBD Oil are low in THC and has not side effects. Best natural health supplement. http://www.cbdoilwiki.com/Home/Details/6?Q=How-Do-You-Extract-CBD-From-Hemp-Or-Cannabis-