Cinnamon has good qualities in reducing the types of diabetes as it is ancient spices used in food. It maintains the sugar levels in blood and improves triglyceride, total cholesterol, HDL cholesterol, and LDL cholesterol levels in people with type 2 diabetes.
There are four types of cinnamon Ceylon, Cassia, Saigon and Korintje. Only Ceylon cinnamon known as true or Mexican cinnamon. The other three types together called Cassia cinnamon.
Benefits
The cinnamon possesses substance as Methylhydroxychalcone Polymer insulin factor that this compound is able to increase the activity of insulin. The high levels of blood sugar in type 2 diabetes lead to the formation of certain harmful substances called Advanced Glycation End these increase oxidative stress.

The U.S. National Library of Medicine found cinnamon extracts are chemo-preventive for colon cancer. Due to its ability of protecting cells against oxidative stress. These blood sugar fluctuations can increase levels of oxidative stress and inflammation, which tend to do a lot of damage to your body’s cells and put you at risk of chronic disease.
Moreover, the antioxidant properties of cinnamon are also being studied for their impact on the formation of the plaques and tangles of Alzheimer’s disease and other dementia.
Cinnamon protects cognitive function and brain health is because it activates neuro-protective proteins that protect brain cells from mutation and undergoing damage. Further, reduces the negative effects of oxidation stress by stopping cells.

To do
Intake up to 6 grams daily seems to be safe. 6 grams of cinnamon is about 1 and ½ teaspoons. Most of studies recommend much less about 1-3 grams, or less than 1 teaspoon.
However, consuming it by sprinkling cinnamon powder in breakfasts, oatmeal,tea,coffee etc.
People with liver problems need not consume as it is inflammatory substance consult your physician before adding in diet. If consumed in high amount can cause liver damage or liver failure.
References
Article updated from healthline.