Vitamin C is an essential human nutrient that is very common and widely used in life. It is an antioxidant that also protects the body from the threat of free radicals and is a coenzyme whose effects are as follows: 1. The most widely known is that a lack of vitamin C can cause scurvy; 2. It can prevent gum recession and bleeding, mainly because gums are soft tissues that tend to produce gum recession and bleeding when there is a lack of protein, calcium and vitamin C. Vitamin C can just carry out effective supplementation to Avoid gum bleeding; 3. Vitamin C can also act as an antioxidant to protect other antioxidants such as vitamin A, vitamin E and unsaturated fatty acids to prevent free radicals from harming the body; 4. It can treat anemia. For the 3-valent iron salts that are difficult to absorb, vitamin C can make it reduce to 2-valent iron salts, promote the absorption of iron in the intestine and improve the utilization of iron in the liver, which is conducive to the treatment of iron deficiency anemia; 5, can improve human immunity. White blood cells are the best immune cells in the body, white blood cells are rich in vitamin C. When the body is infected, white blood cell vitamin C is sharply reduced, vitamin C can enhance neutrophil chemotaxis and deformability and improve bactericidal ability. Vitamin C has many roles, but vitamin C is very easy to be oxidized in the air to react, can not be placed in the external environment for a long time, so save vitamin C to pay attention to the airtight, protected from light preservation. Finally, it should be noted that the specific medication should be combined with the clinical, subject to the guidance of the doctor’s interview.