Rick Simpson Oil, or RSO, is a cannabis concentrate used for many different medical benefits, including relieving cancer symptoms. It has a thick, syrupy consistency and can be applied as a topical or ingested in food or drinks.
In 2003, Rick Simpson created a cannabis oil after three suspicious bumps on his arm turned out to be basal cell carcinoma, a form of skin cancer. Simpson had used cannabis to treat medical issues in the past, so he made a cannabis oil to treat his skin cancer topically, applying it to a bandage and covering the cancerous spots.
Within days, the cancerous growths disappeared. Although his physician refused to acknowledge cannabis as a treatment alternative, Simpson became a true believer in the medicinal powers of cannabis and spread the word of his cannabis oil, later called RSO after him.