Iron supplement is considered to be an important part of nutrition for a human health
Iron supplement
Iron supplements, also known as iron salts and iron pills, are a number of iron formulations used to treat and prevent iron deficiency including iron deficiency anemia. For prevention they are only recommended in those with poor absorption, heavy menstrual periods, pregnancy, hemodialysis, or a diet low in iron. Prevention may also be used in low birth weight babies. They are taken by mouth, injection into a vein, or injection into a muscle. While benefits may be seen in days up to two months may
, due to the higher fat and lower water content preventing the formation of ice crystals.
Infant formula.
Breast milk substitutes are available for infants if breast feeding is not an option. Infant formulas based on cow’s milk, soy or rice can be a supplement to breast milk or a sole source of nutrition before solid food is introduced. Infant formula is usually fortified with dietary nutrients optimised for babies and toddlers, such as iron, to ensure survival, growth and health of the baby. 
See also.