1. Lowering blood sugar level: Cinnamon contains a natural compound, which can improve insulin sensitivity and lower blood glucose level.

2. Antioxidant effect: Cinnamon contains a lot of antioxidants, which can protect body cells from free radical damage.

3. Improve heart health: Cinnamon has the ability to lower cholesterol and triglycerides, which can help reduce the risk of cardiovascular disease.

4. Improve digestion: Cinnamon tea can promote intestinal peristalsis and gastric juice secretion, and relieve dyspepsia and acid reflux.

5. Improve immunity: A variety of nutrients contained in cinnamon tea can enhance the body's immunity and prevent infections and diseases.

However, drinking cinnamon tea also has some potential disadvantages:

1. Excessive intake will have side effects: cinnamon contains a component called coumarin, which may lead to lung inflammation, allergic reaction and other problems.

2. Potential danger to pregnant women and lactating women: Some components in cinnamon may affect the health of fetus or baby, so pregnant women and lactating women should use it with caution.

3. Adverse reactions with some drugs: Some ingredients contained in cinnamon tea may have adverse reactions with some drugs, such as antihypertensive drugs and anticoagulants.

4. Impact on liver function: The hormone components of cinnamon may have an impact on the liver, such as increasing the burden on the liver and affecting liver metabolism. It is recommended that people with liver disease use it with caution.

To sum up, although cinnamon tea has many benefits, it needs to be drunk in moderation, not in excess, and special people need to follow the doctor's advice.