2. People with asthenic cold are not recommended to eat Dendrobium.

3. Patients with chronic diseases such as hypertension and heart disease should take Dendrobium under the guidance of a doctor.

4. Children and pregnant women should take Dendrobium under the guidance of a doctor.

5. People who are allergic to Dendrobium can't eat it. Once the patient has some diseases after eating Dendrobium, he needs to go to the hospital for treatment immediately.