Folic Acid Tablets 400 mcg A potent dosage of folic acid (vitamin B9) in a convenient tablet form, a vital supplement for expectant mothers providing a number of benefits during pregnancy. Folic acid, also known as vitamin B9 or folate, is a popular vitamin that can be found in foods such as legumes & fortified cereals. It’s a recommended supplement for expectant mothers & women who are trying to get pregnant, with the NHS recommending a 400mcg daily supplement until the 12th week of pregnancy*.