Women who are pregnant or trying to become pregnant should get at least 400 micrograms (0.4 milligrams) of folic acid daily before conception and for at least 3 months afterward. Studies show that this greatly reduces a baby's risk of serious neural tube defects.
You usually take folic acid once a day, but sometimes you only need to take it once a week. Most adults and children can take folic acid. If you're pregnant or trying for a baby, it's recommended you take folic acid until you're 12 weeks pregnant. It helps your baby grow normally.