Dear WW: here is an excerpt from an NIH publication:
"How can you make sure you're getting enough folic acid? In 1998, the Food and Drug Administration mandated that folic acid be added to enriched grain products - so you can increase your intake by looking for breakfast cereals, breads, pastas, and rice containing 100% of the recommended daily folic acid allowance. But for most women, eating fortified foods isn't enough. To reach the recommended daily level, you'll probably need a vitamin supplement. Talk to your doctor about whether he or she recommends a prescription supplement or an over-the-counter brand."