Vitamin C effervescent tablets can be used if a child has only a mild vitamin C deficiency, while vitamin C effervescent tablets should not normally be used if a child has a severe vitamin C deficiency or suffers from other serious illnesses. Vitamin C effervescent tablets are mainly composed of vitamin C. Used in moderation, they can help replenish vitamin C in children’s bodies, and at the same time enhance immunity and other ancillary effects. If a child has only a slight vitamin C deficiency, it can be used in moderation. However, it is recommended to do so under the guidance of a doctor. If the child suffers from severe vitamin C deficiency, or even has other comorbidities; or if the child suffers from more serious gastrointestinal diseases, such as chronic diarrhea, Crohn’s disease, chronic gastritis and other diseases, then the child can not use vitamin C effervescent tablets, to avoid that the effervescent tablets on the gastrointestinal mucosa to produce stimulation, aggravate the condition. Adverse reactions include diarrhea, nausea, vomiting, gastrointestinal and abdominal pain, etc. Rash, urticaria, anaphylactic edema, angioedema, anaphylaxis, etc. are occasionally seen. It is contraindicated for those who are allergic to this product and the ingredients contained in it, hyperoxaluria, kidney stones, or those who have a history of kidney stones, severe renal insufficiency, and patients with hemochromatosis. It is not advisable to take large quantities of this product for a long period of time, otherwise: sudden discontinuation of the drug may lead to symptoms of vitamin C deficiency. This product is an effervescent tablet, in order to ensure safety, it is recommended to dissolve in the appropriate amount of water and then take, should not be swallowed directly to avoid harm to the body. Before using the drug should be under the guidance of a doctor, according to the children’s physical condition targeted supplement regulation. If there is any discomfort please go to the hospital immediately to avoid delay.