Hemoglobin
Iron in hemoglobin helps red blood cells transport oxygen.
Iron
MineralIron helps carry oxygen in your blood and muscles and is also used by enzymes throughout the body.
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What it is
What Is Iron?
Iron helps carry oxygen in your blood and muscles and is also used by enzymes throughout the body.
You do not need to memorize a nutrient chart. The useful part is knowing where it shows up in food, roughly how much you need, and what that can look like on an actual plate.
What the body uses it for
What Iron Actually Does
Myoglobin
Iron in myoglobin helps muscle cells store and use oxygen.
Enzyme function
Iron is part of enzymes used in cellular reactions.
Energy metabolism
Iron-containing proteins participate in mitochondrial energy processes.
How much you need
How Much Do You Need?
Recommended amounts depend on the nutrient, age, sex, and life stage. Some compounds do not have an established Dietary Reference Intake.
Use the authoritative source below for the current RDA, AI, upper limit, or other guidance that applies to Iron.
See current intake guidance →Food sources
Where Iron Shows Up in Food
You do not need to memorize this list. These are everyday examples of foods that can contribute Iron. Amounts can change with serving size, variety, preparation, and fortification.
Beef
Lentils
Beans
Spinach
Iron-fortified cereals
Food composition reference: USDA FoodData Central.
Make it useful
What Does That Look Like on a Plate?
Knowing what is in your food is useful. Knowing what to do with it is better. Pick a food. Find a recipe. See what you already have. Plan the meal. Buy what is missing. Then go eat food.
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A little context matters
When More Isn't Better
Iron supplements can be harmful when they are not needed and are dangerous in accidental overdose. Iron status and the cause of anemia should be evaluated clinically.
Food and supplements are not the same thing. Supplements can deliver much larger doses. Medications, pregnancy, kidney or liver function, allergies, and other health circumstances can change what is appropriate.
Evidence & trusted sources
Where This Information Comes From
NIH Office of Dietary Supplements – IronPrimary nutrient reference
USDA FoodData CentralFood composition and nutrient data
Evidence last reviewed: October 2026
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