Folic Acid 400mcg Quest (90). Folic Acid provides 400µg of this B vitamin (in the past was called B9) which is necessary for maternal tissue growth during pregnancy, cell division and blood formation. Folic Acid is also important for homocysteine metabolism, normal psychological functions, normal amino acid synthesis, the immune system and the reduction of tiredness and fatigue.. 400µg per tablet. Pregnancy suitable. Tissue growth during pregnancy. Immune health. Reduction of tiredness and fatigue