Folic acid tablets can be taken during menstruation. They are water-soluble B vitamins, and what is not absorbed will be excreted via urine, without any side effects, and will not affect the volume of menstruation or normal menstrual cycle. Folic acid is widely found in many kinds of green leafy vegetables, and the daily diet can also ensure a certain intake as long as it is not overly partial. It has the important significance of participating in the synthesis of nucleic acid, amino acid and protein in the body, and various metabolic reactions. In the early stages of pregnancy, embryonic cells divide and grow rapidly. For women in the preparation stage or during the first trimester of pregnancy, a daily supplement of 0.4 mg of folic acid tablets can prevent fetal neural tube abnormalities, which can cause abnormal red blood cell development and megaloblastic anemia when folic acid is lacking in the body for various reasons.