Any claims that hemp oil can cure cancer are unsupportable, according to the American Cancer Society, as of 2015. The effect of hemp oil on cancer has not been studied in humans.
The American Cancer Society also debunks claims that hemp oil can cure other conditions, such as ulcers, migraines and infections, according to its website. The organization warns against using hemp oil or marijuana as a primary treatment for cancer or delaying conventional care. Hemp oil is derived from marijuana plants using heat and solvents. U.S. federal laws prohibit possession of hemp oil, and it is not approved for medical use by the U.S. Food and Drug Administration.