COMFREY LEAF, ROOT
Botanical Name: Symphytum officinale Also known as- Symphytum officinale, Bruisewort, Knitback, Knitbone, Boneset, Slippery Root, Bruisewort, Ass Ear, and Blackwort.
One of the most common uses of Comfrey is in an ointment or a poultice applied to sprains, broken bones and other wounds, where it promotes rapid healing of both skin lesions and bone breaks.
History:
Comfrey leaf has a long history of use to promote the healing of bones and wounds, as well as internal use to treat a wide variety of ailments from arthritis to ulcers. Its use in Chinese traditional medicine spans over 2000 years. Comfrey is widely known as "one of nature's greatest medicinal herbs", and has appeared in the U.S. Pharmacopeia, as well as in herbals and compendiums around the world. The main healing ingredient in comfrey appears to be a substance called allantoin, which encourages the rapid growth of cells. Recently, reports of the toxic effects of pyrrolizidine alkaloids in comfrey have led some herbalists to be wary of using it internally. PAs in extremely large doses or over long periods of time may cause potentially fatal damage to the liver. Many leading herbalists and traditional healers question the warnings, pointing to laboratory tests that show only minute levels of PAs in random samples of comfrey preparations.
Beneficial Uses:
Research seems to bear out the claims for the healing properties of comfrey leaf. In one major European study, an ointment based on comfrey root proved more effective at relieving both pain and swelling in 142 patients with sprained ankles. In another study with over 300 participants showed that comfrey leaf treatments of varying types (ointments, salves, compresses and other topical applications), were very effective in treating eczema, dermatitis, viral skin infections and ulcers of the lower leg.
More recent research in the United States has shown that allantoin, one of comfrey's main constituents, breaks down red blood cells, which could account for its ability to help heal bruises and contusions.
With regards to the warnings that comfrey can cause cancer and liver disease, most herbal practitioners point out that those results were from studies that isolated the pyrrolizidine alkaloids and fed or injected them into animal subjects in doses far higher than any typical usage of comfrey leaf, and that comfrey leaf has been regularly ingested by thousands of people around the world without reported ill effects.