Beef liver is one of the most vitamin-dense foods you can eat. A single 100-gram serving (about 3.5 ounces) delivers extraordinary amounts of vitamin A, vitamin B12, riboflavin, folate, and several essential minerals. Some of these nutrients hit well over 1,000% of your daily needs in just one serving.
Vitamin A: The Standout Nutrient
Beef liver contains roughly 23,220 micrograms of retinol per 100 grams, which works out to about 3,096% of the recommended daily amount. That makes it the single richest food source of vitamin A available. The form of vitamin A in liver is preformed retinol, which your body can use immediately without any conversion step.
This matters because plant sources of vitamin A (like carrots or sweet potatoes) contain beta-carotene, which your body has to convert into retinol before it can use it. Your body absorbs 75% to 100% of the retinol from animal foods, compared to just 10% to 30% of the beta-carotene from plants. On top of that, it takes 12 micrograms of dietary beta-carotene to produce the same effect as 1 microgram of retinol. So while carrots are a good source of vitamin A, liver delivers it in a form that’s dramatically more efficient.
Vitamin A supports your vision, immune function, and skin cell turnover. It’s also critical during pregnancy for fetal development, though the extremely high concentration in liver means pregnant women need to be cautious about portion sizes.
B Vitamins: Where Liver Really Shines
The B vitamin content of beef liver is remarkable across the board, but vitamin B12 stands in a category of its own. A 100-gram serving provides about 2,917% of your daily value. B12 is essential for nerve function, red blood cell production, and DNA synthesis. Deficiency causes fatigue, neurological problems, and a type of anemia. Because B12 is found almost exclusively in animal foods, liver is the most concentrated natural source available.
Riboflavin (B2) comes in at 261% of the daily value per serving. Your body uses riboflavin to convert food into energy and to maintain healthy skin and eyes. It also acts as an antioxidant, helping neutralize damaging molecules in your cells.
Folate (B9) reaches 63% of the daily value in raw liver, though this number drops with cooking. Broiling causes about a 41% loss in folate activity, while frying causes closer to a 50% loss. So if you pan-fry a serving of liver, you’re getting roughly half the folate compared to the raw measurement. Folate is essential for cell division and is especially important during early pregnancy to prevent neural tube defects.
Liver also contains meaningful amounts of niacin (B3), pantothenic acid (B5), and vitamin B6, making it one of the few foods that covers nearly the entire B vitamin spectrum in a single serving.
Iron, Copper, and Other Minerals
Beyond vitamins, beef liver provides 4.78 milligrams of iron per 100 grams. The iron in liver is heme iron, the type found in animal tissue, which your body absorbs two to three times more efficiently than the non-heme iron in plants like spinach or lentils. That 4.78 mg represents a significant portion of daily needs, especially for men and postmenopausal women who require about 8 mg per day. Premenopausal women need 18 mg daily, so a serving of liver covers roughly a quarter of that.
Liver is also one of nature’s richest sources of copper, a mineral most people don’t think about but that plays a role in energy production, iron metabolism, and connective tissue formation. Zinc, phosphorus, and selenium round out the mineral profile, contributing to immune health and thyroid function.
How Cooking Affects the Nutrients
Heat breaks down some of the more delicate nutrients in liver, particularly the B vitamins. Folate is the most vulnerable: frying destroys about half of it, and broiling loses around 41%. Vitamin A, being fat-soluble, is more heat-stable and survives cooking better than the water-soluble B vitamins.
If you want to preserve the most nutrients, shorter cooking times at moderate heat are your best bet. Pan-frying liver until just cooked through (still slightly pink inside) rather than cooking it until well-done will retain more of the B vitamins. That said, even a well-cooked serving of liver still delivers far more B12 and vitamin A than almost any other food.
Why Portion Size Matters
The same nutrient density that makes liver impressive also makes moderation important. The tolerable upper intake level for vitamin A in adults is 3,000 micrograms per day, or about 10,000 IU. A single 100-gram serving of beef liver contains roughly eight times that limit. Your body stores excess vitamin A in the liver (your own liver, ironically), and chronically exceeding the upper limit can cause a condition called hypervitaminosis A. Symptoms include nausea, headaches, blurred vision, joint pain, and in severe cases, liver damage.
This doesn’t mean you need to avoid liver entirely. It means treating it as an occasional food rather than a daily staple. Eating a serving once or twice a week gives you the nutritional benefits without pushing vitamin A into problematic territory. Your body can handle occasional spikes in vitamin A intake; it’s the sustained, repeated overconsumption that causes trouble.
Beef Liver vs. Other Organ Meats
Chicken liver and pork liver also contain high levels of vitamin A and B12, but beef liver generally comes out on top for overall nutrient density. Chicken liver has somewhat less vitamin A (about a third of what beef liver contains) and slightly less B12, making it a more moderate option if you’re concerned about vitamin A intake. Heart, another popular organ meat, is much lower in vitamin A but still rich in B12, iron, and CoQ10. Kidney falls somewhere in between.
For people who find the taste of liver too strong, mixing it into ground beef (a common ratio is about 20% liver to 80% ground beef) in dishes like burgers or meatballs can make it more palatable while still boosting the nutritional profile of the meal considerably.