Nutrient

Iron

Established research area

A mineral the body uses to carry oxygen in the blood. Found in red meat, shellfish, beans, and leafy greens; often discussed in relation to energy and tiredness.

Commonly noted

Commonly noted: Iron is a mineral the body uses to make hemoglobin, the protein in red blood cells that carries oxygen from the lungs to the rest of the body.
Low intake: Low iron status is commonly discussed in relation to tiredness, weakness, and pale skin, and can progress to iron-deficiency anemia.
Higher intake: Very high iron from supplements is commonly discussed in relation to constipation, nausea, and stomach upset; the commonly cited upper intake level for adults is 45 mg a day.

Source: NIH ODS

Reference intakes

General reference figures for a typical adult — not a personal target or a claim of need.