Rick Simpson Oil, or RSO, is a full extract cannabis oil meant to be taken orally or applied topically. RSO is a marijuana extract made utilizing a solvent to extract cannabinoids. The most common solvent used to produce RSO is a grain alcohol, but some other solvents like ethanol or butane are sometimes used. RSO is perhaps most commonly used as an alternative to cancer treatments. But the oil has also been used to treat a variety of other health issues including asthma, multiple sclerosis, anxiety, depression, inflammation, and a variety of other conditions. Since RSO is high in THC, it possesses similar medicinal qualities to the compound itself.