The salve which Morgan made and gave to her brother Arthur would heal any wound, even one on a joint or a nerve, within a week, if applied once every day.

Morgan gave the Lady of Noroison a box of ointment which cured madness when rubbed into the temples of the sufferer.

These two salves might be identical, or only two of the many Morgan could probably make. I see nothing to prevent anyone from theorizing either way.