You can take multivitamins during menstruation, but it is recommended that you take them in moderation under the guidance of your doctor and not in excess. Vitamins, as essential nutrients, can strengthen the body’s resistance and should be properly consumed every day. During menstruation, due to the loss of menstrual blood, the body’s resistance drops, so you can supplement vitamins in moderation. However, if a time or a short period of time several times in a row intake of large doses of vitamins or long-term continuous intake of excessive amounts of vitamins may cause vitamin poisoning. Patients may experience nausea, vomiting, headache, dizziness, blurred vision, chest tightness, chest pain, diarrhea, breathing difficulties, irritability and other symptoms. Therefore, it is recommended that patients take vitamins as prescribed by the doctor to avoid the abuse of vitamins leading to adverse reactions.