"But taken internally it can damage the liver."
Yeah, so I've heard. I personally believe that's bunk. I haven't had that experience myself and I suspect that its most likely something comfrey is helping expel that causes the liver problem. I think MH had some factual rebuttal to that claim and there's a holistic nurse practitioner I know that knows the facts on this as well. I'll see if I can dig it up. Thanks for the reply.