Fe-Zyme™ is a source of supplemental iron in a highly bioavailable form, combined with synergists known to assist with uptake and utilization such as vitamin B12, copper, ascorbic acid and vegetable culture. Fe-Zyme™ now contains the ferrous bisglycinate form of iron. Ferrous bisglycinate is a nutritionally functional mineral amino acid chelate that not only has superior bioavailability, but also is easy on the gastrointestinal tract