L-5-MTHF-Ca (5-mthf) is a naturally occurring salt-forming methyl derivative of folic acid. 5-mthf is also known as levomethyl-folate, which is the most biologically active and functional of folic acid. Form, more easily absorbed than ordinary folic acid. Common folic acid must be converted to type 1 methyl folate to participate in two major metabolic pathways: methylation and DNA synthesis, the only form of free folate normally present in human plasma and cells is 5-mthf. Lack of folic acid is usually caused by vitamin deficiency, which is insufficient for absorption. During pregnancy and breastfeeding, the need for folic acid is increased during the growth of children