On Jun 11, 2012, Eric_OH Columbus, OH (Zone 6a) wrote:
This company's promotion of comfrey for internal use ("Certainly, millions of people over thousands of years, have consumed Comfrey in various forms for food and medicine... the leaves are consumed daily by multitudes—fresh, cooked, juiced . . .") omits evidence that the herb contains toxic alkaloids that can severely damage the liver, as well as suspected carcinogens. Cases of both animal and human poisoning have long been known, and both the FDA and many herbalists discourage internal use of comfrey.