Red meat is a classic and reliable source of iron. A 3-ounce serving of trimmed skirt steak provides 2.5mg, or about 13% of your recommended daily intake. Grass-fed beef is an even better choice, offering more omega-3 fatty acids, beta-carotene, vitamin E, and minerals like potassium and zinc than grain-fed varieties, usually with less total fat.
Popular organ meats include liver and kidneys; a 3.5-ounce serving of beef liver boasts a massive 6.5mg of iron.

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