Heh it is not a belief And yes I meant dietary folates. Folinic acid has nothing to do with DHFR. It is processed by other enzymes. DHFR is used to process dietary folates. The oxidized version known as folic acid that only became available in modern times is not responsible for the existence of DHFR which has been in organisms well before man ever walked the planet. Folic acid can only be processed by DHFR in the liver not the intestinal lumen. Hope that helps.