Iron Bark Maple is a valuable tonic, some people are not suitable to take it, especially people with cold and fever, people who usually have inflammatory infections, these people will aggravate their related symptoms if they eat Iron Bark Maple. In addition, people with chronic diseases such as hypertension, heart disease, chronic hepatitis, type 2 diabetes and chronic nephritis should take it orally under the guidance of doctors. Because of its strong tonicity, it can easily raise blood pressure and aggravate heart disease. Children and pregnant women should not take it casually, otherwise it is potentially dangerous, such as promoting premature development and causing miscarriage. Also, people who are allergic to maple tree should not eat it.