A balanced, hypoallergenic B-complex featuring the active forms of vitamins B2, B6, B12 and Quatrefolic® brand of (6S)-5-methyltetrahydrofolate. Active B-Complex is a balanced, hypoallergenic B-complex formula featuring the active forms of vitamins B2, B6, and B12. It also contains Quatrefolic, the stabilized glucosamine salt of (6S)-5-methyltetrahydrofolate, a reduced and active form of folic acid. 5-methyltetrahydrofolate (5-MTHF) is directly usable by the human body as a methyl donor and as such, supports healthy homocysteine blood levels.