Cinnamon bark (Cinnamomi Cortex [Rou Gun) has a potential role in the prevention of many diseases, according to a review by American authors. Recent studies carried out in vitro and in vivo have shown that cinnamon can improve many of the factors associated with development of metabolic syndrome and type 2 diabetes, including insulin resistance, elevated glucose and lipids, inflammation, decreased antioxidant activity, weight gain and increased glvcation of proteins. In addition, cinnamon has been shown to alleviate factors associated with Alzheimer’s disease and ischaemic stroke. In vitro studies have also shown that components of cinnamon inhibit angiogenesis associated with cancer cell proliferation. Human studies involving subjects with metabolic syndrome, type 2 diabetes and polycystic ovary syndrome have all show beneficial effects of whole cinnamon and/or aqueous extracts of cinnamon on glucose and lipid levels, insulin sensitivity, antioxidant status, blood pressure, lean body mass and gastric emptying. (Cinnamon: potential role in the prevention of insulin resistance, metabolic syndrome, and type 2 diabetes. J Diabetes Sci Technol. 2010 May 1;4(3):685-93).