Chondroitin sulfate, the biggest side effect is gastrointestinal symptoms. It is mainly because chondroitin sulfate contains sulfate, when entering the human gastrointestinal tract, digestion through gastrointestinal digestive fluids, will produce obvious stimulation to the upper digestive tract, may appear stomachache, stomach acid, stomach distension, and even nausea, vomiting and other symptoms. If patients suffer from upper gastrointestinal bleeding and severe peptic ulcer, they may need to take it carefully, which may cause the disease to worsen. This is chondroitin sulfate after taking, the only side effect, in addition, chondroitin sulfate is very good, is a set of preventive health care and treatment as one of the drugs. In addition to the prevention and treatment of orthopedic diseases, cardiovascular and cerebrovascular diseases and various types of nerve pain diseases, have a better therapeutic effect.