All nutrient values are per 100g or 100ml. Source: USDA FoodData Central.
Iron deficiency is the most common nutritional deficiency worldwide, affecting approximately 2 billion people. While iron supplements and fortified foods are widely available, the most bioavailable iron comes from whole food sources — particularly heme iron from animal products.
We analyzed 1.84 million food products with iron data from the USDA FoodData Central database. The results highlight both naturally iron-rich foods and iron-fortified products, along with their processing levels.
Top 20 Highest Iron Foods
Products ranked by iron content per 100g, with processing scores.
Do high-iron foods mean more processing?
Iron in the food supply comes in two forms: naturally occurring and fortified. Naturally iron-rich foods — organ meats, shellfish, legumes, dark leafy greens, and seeds — provide iron at Level 1-2 processing. Many breakfast cereals and flour-based products are fortified with iron, sometimes achieving impressive iron numbers but with Level 3-4 processing.
Heme iron (from animal sources) has 15-35% absorption rates, while non-heme iron (from plants and fortification) has 2-20% absorption. This means the raw mg number doesn't tell the whole bioavailability story.
The data shows that traditional iron sources — liver, red meat, shellfish, lentils — remain the most efficient per-processing-level iron sources.
Top 5 iron products, in detail
SPICY PICO DE GALLO
BITE SIZE STRAWBERRY FROSTED SHREDDED WHEAT CEREAL, STRAWBERRY FROSTED
STRAWBERRY FLAVORED FROSTED SHREDDED WHEAT SWEETEND WHOLE GRAIN CEREAL, STRAWBERRY
Quaker Oatmeal Squares Brown Sugar 14.5 Ounce Paper Box
DRAGONFLY, CURRY POWDER
Best low-processing iron options
These products combine high iron content with minimal processing (Level 1-2 only). Proof that you don't need ultra-processed products to get excellent iron.
Iron by food category
Average iron content and processing scores across food categories.
How much iron do you need daily?
The RDA for iron is 8mg/day for adult men and post-menopausal women, and 18mg/day for pre-menopausal women. Pregnant women need 27mg/day. Vegetarians may need up to 1.8x more iron due to lower bioavailability of non-heme iron. Iron deficiency is particularly common in women of reproductive age, young children, and vegetarians.
- 1Organ meats (liver) are the most iron-dense foods at Level 1 processing — 6-9mg per 100g with high bioavailability
- 2Pair plant-based iron sources with vitamin C (citrus, bell peppers) to increase non-heme iron absorption by 3-6x
- 3Fortified cereals can provide 100% DV of iron per serving but at Level 3-4 processing — check if whole food sources can meet needs first
- 4Tea and coffee inhibit iron absorption — avoid consuming them with iron-rich meals if iron status is a concern
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Frequently asked questions
What foods are highest in iron?
Organ meats (liver at 6-9mg/100g), shellfish (clams, oysters), fortified cereals, legumes (lentils, chickpeas), and dark leafy greens are among the highest iron foods. Organ meats and shellfish provide the most bioavailable heme iron.
What is the difference between heme and non-heme iron?
Heme iron (from animal foods) is absorbed at 15-35% efficiency. Non-heme iron (from plants and fortified foods) is absorbed at 2-20%. Pairing non-heme iron with vitamin C significantly increases absorption.
How much iron do I need daily?
Adult men and post-menopausal women need 8mg/day. Pre-menopausal women need 18mg/day. Pregnant women need 27mg/day. Vegetarians may need up to 1.8x these amounts due to lower iron bioavailability from plant sources.
Is iron fortified cereal a good source of iron?
Iron fortified cereals can provide 25-100% of the daily value per serving, making them one of the most iron-dense packaged foods. However, the iron is non-heme (lower absorption) and the fortification process adds to overall processing. Many iron fortified cereals score Level 3-4 in our analysis due to added sugars, artificial colors, and preservatives. Whole food sources like organ meats and legumes deliver iron with fewer additives.
Does steak have iron?
Yes, red meat including steak is one of the best sources of bioavailable heme iron. A 100g serving of beef provides approximately 2.5-3.5mg of iron, and because it is heme iron, the body absorbs 15-35% of it. Steak scores Level 1 (Minimally Processed) in our analysis, making it one of the most efficient iron sources from both a nutrition and processing perspective.