Improved formula. Our Wholefood Iron capsules now provide 10mg of iron in the form of ferrous bisglycinate; a gentle and easily absorbed form of iron with excellent bioavailability. It is particularly gentle on the digestive system, making it an ideal choice for those who may not be able to tolerate other forms of iron well. Iron has many roles within the body including contributing to the reduction of tiredness and fatigue, cognitive function, the formation of red blood cells and haemoglobin, and immune system function.