Optimal Iron contains Ferrochel®–the only patented form of iron in a blend proven to be assimilated by the body up to 400% more than other iron supplements. This means that, rather than building up as a toxin in the body, Optimal Iron is effectively used by the body to enhance health. Studies have also shown that this patented organic form of iron has a strong evidence of low toxicity and safety for long-term use.The overall safety in Ferrochel® is found in its unique patented chemistry. This form of iron is absorbed mostly in the jejunum with some absorption in the duodenum (where iron salts are primarily absorbed). The absorption of Ferrochel® is not inhibited by other dietary components such as tannins, phytates, phosphates and other metals. Ferrochel® has also demonstrated increased bioavailability since it does not enter into other chemical reactions associated with iron salts.