Comfrey Herb Possibly Toxic, Dangerous?

Thanks :)

I did some research on the herbs in Andreas kidney cleanse and I found that Comfrey can be dangerous, has anyone had any difficulties with this herb?


http://www.cancer.org/docroot/ETO/content/ETO_5_3x_Comfrey.asp


"The internal use of comfrey is not considered safe. Experts strongly warn consumers not to eat or drink anything that contains comfrey. This herb should be avoided, especially by women who are pregnant or breast feeding. The US Pharmacopeia reports that the use of comfrey on broken skin should also be avoided because it may be absorbed into the body."


http://caiquesite.com/Foods/dangerous_human_foods.htm


Comfrey. People have long used comfrey (Symphytum officinale), a member of the Boraginaceae family, as an herbal remedy. However, people must limit their ingestion of comfrey since it contains hepatotoxic pyrrolizidine alkaloids. When taken in excessive amounts it can lead to liver disease. The main liver injury caused by comfrey is veno-occlusive disease. It is also reported to be carcinogenic (40) . Comfrey is considered so dangerous that several countries, including Germany and Canada, ban its distribution (94) . With this in mind, it is probably unwise to offer this to your parrot (22) . (Also see borage.)



So, I'm a little apprehensive about using comfrey.

Are there any sites that sell all of Clark's kidney cleanse Herbs packaged together pre-mixed like Andreas kidney cleanse Herbs?

Thanks,
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