Returning once again to comfrey:
James P. Collman, Professor of Chemistry, Stanford University
says this about comfrey, ". . . according to the FDA, between 1985 and 1993 at least seven cases of hepatic veno-occlusive disease (which causes obstruction of blood flow from the liver with potential scarring) resulted from the use of commercially available comfrey products. These complications are caused by pyrrolizidine alkaloids, toxic substances found in comfrey. . . Tests on animals have shown that the pyrrolizidine alkaloids in comfrey may also cause pulmonary, kidney, and gastro-intestinal pathologies, as well as cancer. Due to these side-affects, the United Kingdom, Australia, Canada, and Germany have restricted the use of comfrey products (including herbal teas made with comfrey) to use only under a physicians prescription."
And with regards to the protein found in comfrey:
Researchers at the universities of Minnesota and Wisconsin report, "Three ounces of dried turnip greens or spinach, in comparison to 20 oz of dried comfrey, supply adults with the total daily requirement of all essential amino acids, except for methionine."
Let's see . . . 3 ounces of
spinach versus 20 ounces of
comfrey . . . Do you really want to go with the comfrey??
Steve