The reason why people use folic acid supplement is to prevent Anemia, stroke, and heart disease . Consuming the supplement before the child is born could also enhance the development of brain and spinal cord of the infants. The supplement cannot prevent blindness.
Headache, nausea, vomiting, constipation, dizziness, spinning sensation, drowsiness, slurred speech, loss of balance or coordination, swollen or tender gums, sleep problems (insomnia), nervousness, tremors, rash.