Iron is an essential mineral that plays central roles in energy production immune system function and neurological health.* Iron is an essential component of hemoglobin a molecule that transports oxygen to the cells of the body and myoglobin which binds oxygen used in muscle tissues.* NOW uses Ferrochel? Iron Bisglycinate which has clinically demonstrated superior absorption and is well tolerated because it is gentle and non-constipating.* Ferrochel? is a registered trademark of Albion Laboratories Inc. Natural color variations may occur in this product.