Cinnamon is a common spice, but it is also used as a medicine and herb. Here are some of the benefits and effects of cinnamon:

1. Lowering blood sugar: cinnamon can help lower blood sugar levels and help control diabetes.

2. Improves cardiovascular health: Cinnamon can improve cardiovascular health by lowering blood cholesterol and triglyceride levels.

3. Antibacterial and anti-inflammatory: active substances in cinnamon can inhibit the growth of bacteria and fungi, which helps to treat infections.

4. Promotes digestion: Cinnamon promotes digestion and reduces stomach upset and flatulence.

5. Improve cognitive ability: Some studies have shown that cinnamon can improve memory and thinking skills.

However, the following contraindications to cinnamon should be noted:

1. Pregnant women should avoid excessive intake of cinnamon as it may lead to miscarriage or premature labor.

2. Intake of cinnamon should be avoided when undergoing surgery or being injured in any way, as cinnamon can increase the risk of bleeding.

3. If you are taking medication or have any health problems, consult your doctor before using cinnamon. Cinnamon may interact with certain medications and may cause adverse reactions.