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What is Folic Acid:

Folic acid is a water-soluble B vitamin that can be consumed in two forms, as folate or folic acid. Folate occurs naturally in foods, whereas folic acid is the synthetic form of this vitamin that is found in supplements and fortified foods [2]. Folate is responsible for the production and maintenance of new cells. Pregnancy and infancy are periods in which rapid cell growth and division occur, thus making folate/folic acid an important contributor to this vital process. The recommended daily allowance of folic acid is as follows:

 Before PregnancyDuring PregnancyLactation
Ages 19 and up400 mcg  
All ages 600 mcg500 mcg
1 mcg of food folate=0.6 mcg of folic acid in supplements and fortified foods [2].
Mcg=microgram