As health awareness increases, many women choose to take multivitamin and mineral supplements, and many use high-dose supplements at various times. Especially women of childbearing age, in order to give birth to a healthy and smart baby, they will take a large amount of vitamins and minerals before pregnancy. However, this is very likely to lead to excessive vitamin supplementation, which will cause harm to the fetus. Therefore, people preparing for pregnancy should pay more attention to the intake of various nutrients to avoid discomfort and affect the development of the fetus.