​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.
^ Vogl, S; Picker, P; Mihaly-Bison, J; Fakhrudin, N; Atanasov, AG; Heiss, EH; Wawrosch, C; Reznicek, G; Dirsch, VM; Saukel, J; Kopp, B (2013). "Ethnopharmacological in vitro studies on Austria's folk medicine - An unexplored lore in vitro anti-inflammatory activities of 71 Austrian traditional herbal drugs". J Ethnopharmacol. 149 (3): 750–71. doi:10.1016/j.jep.2013.06.007. PMC 3791396. PMID 23770053.
Researchers found that the ketogenic diet significantly decreased blood glucose, slowed tumor growth, and increased mean survival time by 56.7% in mice with systemic metastatic cancer. While hyperbolic oxygen therapy by itself did not influence cancer progression, when it was combined with the ketogenic diet, it produced a significant decrease in blood glucose, tumor growth rate, and a 77.9% increase in mean survival time compared to controls.

A spice that is popular for soothing your stomach and aiding digestion, Ginger also has the ability to normalize blood sugar levels. Multiple studies conducted on rats show that ginger extract can have a significant anti-hyperglycemic effect. It lowers serum total cholesterol, triglycerides and increases the HDL-cholesterol levels. Diabetes is a digestive disorder. Diabetics often face issues with acid reflux. Ginger soothes the entire digestive tract, giving diabetics another reason to add ginger to their supplement regimen.
According to the American Herbalist Guild, herbalists can practice either as primary health care providers or adjunctive health care consultants. The Guild explains that most visits to an herbalist begin with a consultation about your past and current health history, your dietary and lifestyle practices, or other factors related to your health issue. Then, according to the Guild “the herbalist, with your involvement, should develop an integrated herbal program that addresses your specific health needs and concerns.”
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: 
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