(6S)-5-methyltetrahydrofolate glucosamine salt. A high biologically active form of folate. 4th generation folic acid technology. Methyl Folate ((6S)-5-methyltetrahydrofolate or (6S)-5-MTHF) is a highly biologically active form of folate. Due to the body's limited ability to transform synthetic folic acid into the active form of folate, supplementation with 5-MTHF is highly preferable.