Two types of iron vitamins are heme iron and nonheme iron. Heme iron contained in animal products like meat, while nonheme iron found in plants. Another difference between heme iron and nonheme iron is absorbed by the body easier. Heme iron more easily absorbed than nonheme iron.

Zinc is required for normal iron metabolism. Vitamin A together with iron vitamins work together in preventing anemia. Zinc and iron if consumed at the same time may reduce absorption of zinc. Iron and calcium are consumed together can also reduce the amount of iron that can be absorbed by the body. Other products that can inhibit iron absorption are: phosphates, , calcium, legume protein,  polyphenols, phytic acid, , copper, cadmiumlignin tannin, manganese, cobalt and soy protein. Products above are classified as an inhibitor. Inhibitor of nonheme iron has more effect than the heme iron.

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The best absorbed iron supplement are ferrous sulfate, ferrous fumarate, and ferrous gluconate. Those are ferrous iron salts.

• Nature Made Iron 65mg, Equivalent to 325 mg Ferrous Sulfate - 300 Tablets
• Freeda Ferrous Fumarate Iron 29 mg. - 250 TAB
• Ferrous Gluconate 324 Mg Tablets - 100 Ea

What you need to treat iron deficiency is iron capsules. Iron capsules is most common type of health supplement prescribed because iron-deficiency anemia is one of the most common nutrient deficiencies, according to the WHO (World Health Organization). Various types of iron capsules are :

§   Ferrous Sulfate

§   Ferrous Fumarate

§   Ferrous Gluconate

§   Iron Polysaccharide

§   Carbonyl Iron