My friend who used it had a hard time getting the type that worked for her.
She was a nurse and I think she would have preferred hers being regulated and from a drug store so that she knew the ingredients and the doseage.
When we were in Colorado my husband gave a ride to a young man back to his cannabis shop where he dispensed the stuff. He told hubby he has a fold out piece of literature that he uses for dosages. I believe it has its place in the medical field but more study needs to be done in some cases.