There is some risk of poisoning.

1. Overdosing on VC supplements in the short term can produce side effects such as polyuria, dysentery, and skin rashes.

2. Long-term overdose of VC supplements may lead to oxalate and uric acid stones.

3. Overdose of VC supplements during the growth period of pediatric patients may lead to bone diseases.

4. A one-time intake of more than 2500-5000 mg of VC may lead to massive rupture of red blood cells, hemolysis and other critical phenomena.

5. Overdose weakens the body's resistance.

One, the structure of vitamin C is similar to glucose, is a multi-hydroxy compounds, its molecule in the 2nd and 3rd position on the two adjacent enol hydroxyl very easy to dissociate and release H +, so it has the nature of the acid, also known as ascorbic acid.

Second, vitamin C has a strong reducibility, easily oxidized into dehydrovitamin C, but the reaction is reversible, and ascorbic acid and dehydroascorbic acid has the same physiological function, but dehydroascorbic acid, if you continue to oxidize the generation of diketogulonic acid, the reaction is not reversible and the physiological efficiency of the loss of all.

Three, vitamin C is a colorless and odorless flaky crystal, soluble in water, insoluble in organic solvents. Stable in an acidic environment, oxygen in the air, heat, light, alkaline substances, especially by the presence of oxidative enzymes and trace copper, iron and other metal ions, can promote its oxidation and destruction.

Four, vitamin C molecular structure of the enediol group, especially the C3 OH due to the influence of the *** conjugation effect, acidic, C2 OH due to the formation of intramolecular hydrogen bonding, acidity is very weak, so vitamin C is generally manifested as a monobasic acid, and sodium bicarbonate can be generated to generate sodium salt.

Fifth, the research of experts around the world clearly shows that eating fresh fruits every day, especially citrus fruits, stomach cancer, esophageal cancer, oral cancer, pharyngeal cancer and the incidence of cervical cancer will be greatly reduced, but also some studies have pointed out that vitamin C-rich fruits can help to prevent colon cancer and lung cancer.