The iron part of the dye in the form of the heme (hemoglobin and myoglobin in meat), a non-haem (in plant), and enzymes responsible for transport and storage of oxygen in the body. It occurs in enzymes responsible for: the metabolism of fatty acids, prostaglandin biosynthesis, catabolism of tryptophan. The absorption of iron in plant is lower than in animal products. In plant foods, it is reduced by contained chemicals: phytates and oxalates, also calcium and high acidity (pH factor). Only 8% of the intake of iron is absorbed by the body and transported to the blood. For tts absorption is needed sufficient amount of: cobalt, manganese, copper and vitamin C. Iron itself is essential for the metabolism of B vitamins. Source of acquisition of iron are animal products (meat, organ meats, egg yolks) and plant products (whole grain bread, beans , cocoa, parsley, nuts, soy). Iron is also present in synthetic form as a component of vitamin-mineral and mineral and mono-preparation supplements, often enriched with vitamin C. Supplements containing iron compounds are recommended for athletes during intense training and those on a meatless diet (vegetarians and vegans).
Iron deficiency causes anaemia. Using a large amount of strong coffee or tea hinders the absorption of iron. Symptoms of iron deficiency are: insomnia, diarrhea, impaired body temperature, loss of papillae on the tongue, reduced exercise capacity, and reduced intellectual and psychological efficiency.
Excess iron reduces the absorption of other elements (e.g. zinc, copper), reduced immunity, causing tissue damage of some organs (kidney, liver, heart), increased risk of cancer.
Dosage: 3-12 mg per day.