Ground cinnamon is very safe, the volatile oils can however cause a skin rash. Small amounts of coumarin can be found in Cassia and other cinnamons, generally only large doses of this compound will cause blood-thinning and liver problems, but it's something to be aware of. Also if you're planning on having surgery you should stop the use of cinnamon at least one week before going in as it has a blood thinning effect. You should also take care to monitor your blood sugar to avoid an unsafe drop in blood pressure.
A critical question is often asked: Why pursue the phenotypic reversion of malignancy? Surely it is better to look for more efficient methods of killing tumor cells? Tumors are remarkable creatures, possessed of manifold means to defeat the arsenal of therapeutics arrayed against them. Among other things, the genomic instability of tumors gives them a persistent evolutionary advantage, ensuring the survival of stronger, fitter, more aggressive cells that will go on to populate the body of their host. The approaches that have been taken show that it is possible to revert the malignant phenotype by the correction of environmental cues and by the normalization of signal transduction pathways even as the genome remains malignant and unstable. In this sense, the microenvironment can be dominant over the malignant genotype. It is of course preferable to eradicate the tumor altogether, but aggressive chemotherapy to eradicate a tumor often kills the host. The malleable nature of tumors would indicate that multiple approaches may be necessary. This raises the possibility of the long-term management of some cancers as a chronic condition in which the malignant potential of the tumor cells is constrained, perhaps for the lifetime of the patient.

^ Jump up to: a b Bauml, J. M.; Chokshi, S.; Schapira, M. M.; Im, E.-O.; Li, S. Q.; Langer, C. J.; Ibrahim, S. A. & Mao, J. J. (26 May 2015). "Do attitudes and beliefs regarding complementary and alternative medicine impact its use among patients with cancer? A cross-sectional survey". Cancer. 121 (14): 2431–38. doi:10.1002/cncr.29173. PMC 5589132. PMID 26011157. Lay summary – Reuters (26 May 2015).
Eating a clove or two of fresh garlic a day may indeed keep the doctor away, in part because it has immune-boosting, antibacterial, antiviral, and anti-fungal effects. Many of garlic's therapeutic effects are derived from its sulfur-containing compounds, such as allicin, which are also what give it its characteristic smell. In general, garlic's benefits fall into four main categories:
​Peppermint is a very well known herb today because of the amazing aroma it has when the leaves are bruised. It's used in so many different ways both culinary and medicinal it's hard to not include peppermint in our list of herbs. Peppermint originally came from England some time in the late seventeenth century and is actually a hybrid that comes from the water mint and spearmint. Peppermint was also extensively used in Ancient Egypt where they used it for indigestion, dried peppermint leaves have even been found inside of the pyramids that the Egyptians had built. During the eighteenth century peppermint became popular in Western Europe for treating things like nausea, morning sickness, and respiratory infections.
Kava has been used by the people of the Pacific islands for hundreds of years as a natural anti-anxiety treatment. It has a very calming effect and puts most people in a good mood. It has also been used as a diuretic and to treat urinary problems, arthritis, asthma and upset stomach. It is very popular in Germany and often prescribed as the first line of treatment for anxiety disorders.
Bee Balm was often used by the Native Americans to treat intestinal problems, colic and flatulence. Tea made from this plant was used to induce sweating and break fevers. Bee balm is often used to treat the common cold and sore throat as well. The leaves of this plant are a good source of essential oil that contains thymol. Thymol is an antibiotic and often used as an ingredient in mouthwash. 
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