FerritinEcological Formulas Ferritin Bioavailable Iron Capsules contain a powerful formula that delivers 5 milligrams of ferritin the key protein responsible for iron storage in your body. This supplement also provides iron the essential mineral in its most bioavailable form for easier absorption. The ferritin in this exclusive formula is a natural derivative of bovine spleen. Unlike many other iron supplements Ferritin Bioavailable Iron doesnt cause negative