Until the findings are reproduced consistently, and cinnamon has been show to provide a meaningful improvement in relevant measures, there is no persuasive evidence to suggest that cinnamon has potential as a useful treatment option. Drugs that work, work consistently and provide meaningful improvements in measures of the disease. Why doesn’t cinnamon work?  There may be an active ingredient, but it’s present in low concentrations, and varies in content between the different batches of cinnamon used in the different trials. In that case, the active ingredient needs to be standardized and possibly isolated, which would make it a drug treatment.  Or this could be yet another example of a supplement that looks promising in early studies, only to see the effect disappear as the trials get larger and control for bias more effectively.
Normally, blood glucose levels are tightly controlled by insulin, a hormone produced by the pancreas. Insulin lowers the blood glucose level. When the blood glucose elevates (for example, after eating food), insulin is released from the pancreas. This release of insulin promotes the uptake of glucose into body cells. In patients with diabetes, the absence of insufficient production of or lack of response to insulin causes hyperglycemia. Diabetes is a chronic medical condition, meaning that although it can be controlled, it lasts a lifetime.