About half the practitioners who dispense complementary treatments are physicians, although they tend to be generalists rather than oncologists. As many as 60% of American physicians have referred their patients to a complementary practitioner for some purpose. While conventional physicians should always be kept aware of any complementary treatments used by a patient, many physicians in the United Kingdom are at least tolerant of their use, and some might recommend them.
Many therapies have been (and continue to be) promoted to treat or prevent cancer in humans but lack good scientific and medical evidence of effectiveness. In many cases, there is good scientific evidence that the alleged treatments do not work. Unlike accepted cancer treatments, unproven and disproven treatments are generally ignored or avoided by the medical community, and are pseudoscientific.
Comfrey's use dates back centuries to at least the time of the ancient Greeks. During the Middle Ages comfrey was a widely cultivated herb found extensively in the gardens of monasteries. Throughout the 1700's and 1800's comfrey was also a popular herb grown in many gardens across Europe as well as America. Sometime during the late 1970's however research revealed that comfrey when taken internally can cause severe liver damage so it has lost popularity and internal use is even banned in many countries. Applications in the from of ointments, poultices, or creams are still considered safe though. Comfrey can still be found growing wild in central Europe, and the eastern United States as well as a few western states.
Another well know spice in the kitchen cinnamon is also known for it's medicinal properties. While not really an herb I still think it's important to list it in our list of herbs and their uses. Cinnamon actually comes from the inner bark of a tree in the laurel family. It's been used for centuries and was a hot commodity for trade in ancient times. In fact during the first century A.D. in Rome cinnamon was 15 times more expensive than silver. The Chinese were probably the first to use cinnamon as a medicinal herb and used it to treat fevers, and diarrhea. In more modern times cinnamon has been found to stabilize blood sugar levels in diabetics, as it has an insulin kind of effect.