There's been coverage in the media recently about the health benefits of taking Folic acid supplements, particularly during pregnancy.

Folic acid, a form of folate (a 'B' vitamin), has been linked with reducing depression, improving fertility, reducing spina bifida and congenital heart defects in babies, as well as helping to prevent cardiovascular disease, strokes and even cognitive decline.  Many countries advocate taking extra doses of Folic acid and also add the supplement to many common food sources, such as bread and breakfast cereals.

However, there's also a fair amount of research going on into whether people can consume too much folic acid.  A recent study published in the Proceedings of the National Academy of Sciences indicates it's possible to have too much Folic acid.

The study shows that although Folic acid is found widely in foods such as spinach and other green vegetables, it is then converted into folate in the liver, although the liver has a limited ability to make the conversion.  Unmetabolised Folic acid is often found in blood and urine.

The recommended daily dose of Folic acid (0.4mg) is converted into folate in most people, however, the extra food additives in bread and cereals, particularly when combined with supplement pills commonly taken during pregnancy, could easily amount to far more than the recommended daily intake.

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