"Folic acid deficiency may cause poor growth, gray hair, swollen tongue (glossitis), mouth ulcers, peptic ulcer, and diarrhea. It may also lead to certain types of anemias. ... Too much folic acid usually doesn't cause harm, because the vitamin is regularly removed from the body through urine."
"What foods provide folate? Leafy green vegetables (like spinach and turnip greens), fruits (like citrus fruits and juices), and dried beans and peas are all natural sources of folate. In 1996, the Food and Drug Administration (FDA) published regulations requiring the addition of folic acid to enriched breads, cereals, flours, corn meals, pastas, rice, and other grain products. "
"Folic acid is one of the most chemically complicated vitamins, with a three-part structure that puts special demands on the body's metabolism. The three primary components of folic acid are called PABA, glutamic acid, and pteridine. (Two of these components, glutamic acid and pteridine, help explain the technical chemical name for folate, namely pteroylmonoglutamate.) "
"The human body needs folate to synthesize DNA, repair DNA, and methylate DNA as well as to act as a cofactor in certain biological reactions. It is especially important in aiding rapid cell division and growth, such as in infancy and pregnancy. Children and adults both require folate to produce healthy red blood cells and prevent anemia.["