Zahler s Methyl Folate (Quatrefolic Acid) is a stable and active Folate Formula which supports healthy fetal development. Zahler s Folate which is sourced from Quatrefolic is a stable and active form of folic acid. This important vitamin helps produce red blood cells supports tissue health and is essential for the normal functioning of the brain and nervous system. Adequate intake of folic acid during pregnancy help support healthy fetal development.