The Economist dated 29th August reports that the recommended daily dose of 0.4 mg of folic acid is converted into folate in most people. The conversion to folate takes place in the liver. The liver has only a limited capacity to make this conversion. Unmetabolised folic acid is found in human blood and urine. Intake of folic acid of more than 1 mg a day increases the body's exposure to circulating unmetabolised folic acid. High doses of folic acid are suspected to exacerbate certain cancers.
In India the most recommended folic acid drug is FOLVITE . This tablet contains 5 mg folic acid ! The ministry of health should study the possible harmful effects of such abnormally high dosage of essential chemicals.