comfrey (Symphytum officinale L.) roots contain the liver toxic lycopsamine
Essential oils do not contain alkaloids. Alkaoids however find medical uses in herbalism.
Lycopsamine
http://en.wikipedia.org/wiki/Alkaloid
http://en.wikipedia.org/wiki/List_of_psychoactive_plants
http://en.wikipedia.org/wiki/Medical_cannabis
http://en.wikipedia.org/wiki/50_Fundamental_Herbs#50_Fundamental_herbs
Ian Brealey
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