Vitamin C Injection is used to supplement vitamin C, stimulate blood clotting, and promote iron absorption in the intestines. It is used for the treatment of scurvy, chronic iron poisoning, idiopathic methemoglobinemia, and for other people with vitamin C deficiency. 1. Effect: The main effect of vitamin C injection is to supplement the lack of vitamin C. Vitamin C is involved in amino acid metabolism, neurotransmitter synthesis, collagen and tissue cell interstitial synthesis, which can reduce capillary permeability, accelerate blood coagulation, stimulate coagulation function, and promote the absorption of iron in the intestine. 2. Role: According to the efficacy of vitamin C injection, it is commonly used in the treatment of scurvy in clinical practice, and can also be used in the adjuvant treatment of various acute and chronic infectious diseases and purpura. Moreover, vitamin C promotes the chelation of iron by desferrioxamine, which accelerates iron excretion and can be used in the treatment of chronic iron poisoning. It can also be used in the treatment of idiopathic methemoglobinemia. Vitamin C injection should be used under the guidance of a doctor, and should not be used indiscriminately to prevent aggravation of the condition.