B12 is generally referred to as vitamin B₁₂, and long-term supplementation of vitamin B₁₂ by a woman who does not have the appropriate symptoms or deficiency is not beneficial, and may also cause iron deficiency anemia. Vitamin B₁₂ is a B vitamin. It plays a role in the production of red blood cells in the body and if deficient may lead to anemia. However, vitamin B₁₂ in the daily meat, soy and other foods is relatively rich, so a balanced daily diet is generally not deficient in vitamin B₁₂, do not need to take additional supplements. In addition, vitamin B₁₂ can also be synthesized by human intestinal bacteria. Thus, the body’s need for vitamin B₁₂ is not excessive. However, if there is a lack of vitamin B₁₂ due to vitamin B₁₂ caused by megaloblastic anemia and other diseases, you need to follow the doctor’s advice to supplement the vitamin B₁₂, at this time, the woman to take vitamin B₁₂ is beneficial, can treat the disease. However, it should not be taken for a long time, so as not to cause iron deficiency anemia. In addition, lactating and pregnant women should take vitamin B₁₂ with caution. Vitamin B₁₂ is a medicine and should be taken according to the doctor’s prescription, not long-term self-medication.