Abstract
Throughout this paper the term folic acid refers to that group of vitamin compounds known chemically as the Pteroylglutamic Acid Group of compounds. The parent compound of this group is Pteroylglutamic Acid (PGA). The term folinic acid (CF) refers to the chemical compound formyl-tetrahydro pteroylglutamic acid. This compound differs from the other pteroylglutamates in that it is necessary to support the growth of the organism, Lueconostoc citrovorum. The term Citrovorum Factor is synonymous with folinic acid. The synthetically synthesized analog of folinic acid is called Leucovorin (Lederle), The other compounds of the pteroylglutamic group will be referred to by their chemical names whenever possible.