Iron from plant-based ferritin 10mg iron per gastro-resistant capsule Very well tolerated and bioavailable FMDs Ferritin+TM capsules contain 10 mg of iron per capsule in the form of plant-based ferritin. The ferritin iron is highly bioavailable and well-tolerated . Ferritin is the storage molecule of iron. Its protein shell encloses approximately 4,000 iron ions. The ferritin is isolated and encapsulated from a ferritin-rich legume, the soybean. The advantages of this are that the body can absorb and tolerate the iron more effectively . Taking iron supplements often leads to gastrointestinal problems. Ferritin+TM is generally very well tolerated. Furthermore, the capsules are enteric-coated , ensuring the ferritin safely reaches the intestines.