Created by Canadian medical marijuana activist Rick Simpson, RSO is a cannabis-derived oil that has an especially high concentration of marijuana»s psychoactive compound, (THC). THC has some pretty potent effects that, when concentrated, have shown signs of being able to treat a variety of ailments.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. THC has been known to potentially treat the same conditions and many more including Alzheimers, Parkinsons disease and even eating disorders.