Ben Greenfield claims: July 24, 2018 at two:28 pm Supercritical CO2 extraction. Subcritical/Supercritical CO2 oil extraction has a number of advantages above other extraction mediums, including alcohol and hydrocarbons: CO2 is nontoxic and is mostly Viewed as Safe (GRAS) through the FDA to be used in food stuff products. http://hemphappyauh.blogzag.com/38790951/the-definitive-guide-to-fda-and-cbd-cosmetics