There is no such thing as the fastest iron supplement for blood replenishment, you can take oral ferrous sulfate, ferrous gluconate, ferrous succinate, etc. with vitamin C to replenish iron. Ferrous sulfate, ferrous gluconate, ferrous succinate and so on after taking the effect is not very big difference, but vitamin C as a reducing agent, can improve the body’s iron absorption efficiency, so that can be faster blood replenishment. Iron supplementation may cause a series of gastrointestinal symptoms such as nausea and vomiting, so usually iron is recommended to be taken after meals, some patients may be allergic to a certain type of iron, this situation requires special attention. In addition, iron supplements should be taken gradually and should not be taken in excess. If you need to take medication, you should take it under the guidance of a doctor, do not blindly use drugs. If there is any discomfort, the appropriate treatment should be carried out under the guidance of the doctor.