"Also, what is the recommended dose for a cancer patient?"
Hello. ‘CBD Biocare’ and ‘CBD Integrity and Trust’ are two companies among many, that state that their products are produced using the CO2 extraction process. This is non-hexane and non-butane, the cleanest and purest way to produce Cannabidiol isolate.
Finding the right dose of medical cannabis is a personalized task. Dosing is best achieved when patients have professional guidance. According to the Mayo Clinic "To increase appetite in people with cancer, 2.5 milligrams of THC has been taken by mouth with or without one milligram of CBD for six weeks. In people with cancer and chronic pain, 5-20 milligrams of delta-9-THC has been taken by mouth daily".