Ammonia, or glucosamine, is not recommended often due to the presence of contraindications or adverse reactions. 1. Contraindications: Pregnant and lactating women, those who are allergic to the ingredients of aminosugar are prohibited, and since the active ingredient of the drug is obtained from crustaceans, those who are allergic to crustaceans should also be prohibited. 2. Adverse reactions: after eating aminosugar, some patients may experience serious adverse reactions, such as nausea, abdominal pain, constipation, diarrhea, headache, rash, itching, such patients are generally not recommended to eat aminosugar. Eating aminosugar must be taken under the guidance of a doctor, patients can not take by themselves, patients who suffer from osteoarthritis, can not take aminosugar, can be guided by the doctor to take other drugs.