Folate or folic acid, a yellow compound, is a member of water-soluble B complex vitamins with the chemical name of pteroyl glutamic acid (PGA). Folic acid does not exist as such in nature but exists as folates in polyglutamate form (conjugated folates). For its metabolic action as co-enzyme, polyglutamates must be reduced to dihydro- and tetrahydrofolate forms.