Amino chondroitin refers clinically to glucosamine, which may cause allergic reactions and gastrointestinal irritation when taken for long periods of time. Glucosamine is used clinically for the treatment and prevention of osteoarthritis in all parts of the body: including the knee, hip, spine, shoulder, hand and wrist, and ankle. Adverse reactions include allergic reactions and gastrointestinal irritation. 1. Allergic reaction: Due to the different physical condition of each person, some people taking Glucosamine may lead to allergic reaction, with skin redness, swelling, itching, pain, etc. If the allergy is severe, it may lead to allergic blisters. 2. Gastrointestinal reactions: some people taking glucosamine orally may irritate the gastrointestinal tract, resulting in nausea, vomiting, loss of appetite, abdominal distension, abdominal pain, diarrhea, constipation and other adverse reactions. Patients who are allergic to this product are prohibited. Use with caution in pregnant and lactating women. Note that this product should be taken during or after meals to reduce gastrointestinal irritation. Use with caution in severe hepatic and renal insufficiency. Glucosamine should be taken orally under the supervision of a doctor, and it is recommended to stop the drug immediately and go to the hospital in time if the above symptoms occur during the medication.