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I looked up "comfrey" on google because I wanted to know what it looks 
like.  Curiously, in the first couple of links i found sites promoting 
its use as a digestive aid and for wound healing, and sites warning 
about how very toxic the plant is, and how you shouldn't ingest it or 
expose broken skin to it.  I gather substances in it are toxic to the 
liver and promote cancers.  (Of course, promoting cell growth might 
both promote cancer and also promote wound healing, I suppose.)

Ginda