Iron is another important mineral that is involved in various bodily functions, including the transport of oxygen in the blood. This is essential for providing energy for daily life. Iron is lost from the body through shedding intestinal cells, sweating and blood loss. good sources of iron include beef and chicken, nuts, vegetables, grains, and fortified cereals. The recommended daily intake for iron is around eight milligrams per day for men and 80 milligrams per day for women. Now, iron deficiency is uncommon in developed parts of the world, and the probability that men will need to supplement with iron is low, but the probability is moderate for women because of their higher recommended daily intake.

Symptoms of iron deficiency include fatigue, impaired mental capacity, impaired immune function, decreased work performance, and in extreme cases, anemia.