Cinnamon is a commonly used Chinese medicinal material and seasoning. Its main functions include:

1. Promote blood circulation: Cinnamon has a warming and tonic effect, which can promote blood circulation and relieve cold dysmenorrhea and other problems.

2. Promote metabolism: Cinnamon can promote metabolism, which is beneficial to weight loss and preventing the occurrence of metabolic diseases such as diabetes.

3. Antibacterial and anti-inflammatory: Cinnamon contains antibacterial and anti-inflammatory ingredients, which are helpful in treating colds, coughs, bronchitis, etc.

4. Protect cardiovascular health: Cinnamon can lower blood fat and cholesterol and protect cardiovascular health.

Cinnamon should be contraindicated by the following groups:

1. Pregnant and lactating women should not eat it.

2. Patients with liver and kidney dysfunction should not consume excessive amounts.

3. Patients with irregular menstruation, diabetes, and cardiovascular disease must consume it appropriately under the guidance of a doctor.

4. Cinnamon can promote blood circulation, but excessive consumption can cause blood circulation to be too fast, causing dizziness, heart palpitations and other uncomfortable symptoms, so excessive consumption should be avoided.

In short, moderate consumption of cinnamon can play a certain health care role, but people with existing diseases should consume it appropriately under the guidance of a doctor.