Beef Liver Benefits: Nutrients, Safety, and Why It’s Called Nature’s Multivitamin

Beef Liver Benefits: Nutrients, Safety, and Why It’s Called Nature’s Multivitamin

Written by Emile Siers-Jamieson, Founder of REGEN+. Reviewed by Josh Achten, BAppSc (Sports Nutrition), University of Otago.

Beef liver is one of the most nutrient-dense whole foods available. A 100g serving provides over 2,000% of the daily value for vitamin B12, over 500% for vitamin A as preformed retinol, and meaningful amounts of folate, iron, copper, choline, and riboflavin (USDA FoodData Central). This concentration of bioavailable nutrition in a single food is why liver is often described as "nature's multivitamin."

Key Takeaways

  • Beef liver provides more vitamins and minerals per gram than almost any other whole food, with particularly high concentrations of B12, vitamin A, riboflavin, copper, and folate (USDA FoodData Central).
  • The vitamin A in liver is preformed retinol, which the body can use directly. A substantial proportion of the population carries gene variants that reduce their ability to convert beta-carotene from plant foods into retinol (American Journal of Clinical Nutrition, 2010).
  • Liver contains natural folate rather than synthetic folic acid. Some individuals with common MTHFR gene variants may process folic acid less efficiently (CDC, MTHFR Gene Variant).
  • Beef liver is one of the richest dietary sources of choline, providing approximately 333mg per 100g. Most adults do not meet the adequate intake for choline (NIH Office of Dietary Supplements).
  • Freeze-dried liver supplements offer a way to access these nutrients without the taste barrier, though nutrient content per serve is lower than a full portion of fresh liver.

What Nutrients Does Beef Liver Contain?

The nutrient profile of beef liver is exceptionally broad. Per 100g of raw beef liver, USDA data shows approximately (USDA FoodData Central):

  • Vitamin B12: approximately 59mcg (over 2,000% DV). Essential for nerve function, red blood cell formation, and DNA synthesis (NIH Office of Dietary Supplements).
  • Vitamin A (retinol): approximately 4,968mcg RAE (over 500% DV). Preformed retinol the body can use directly without conversion.
  • Riboflavin (B2): approximately 2.76mg (over 200% DV). Supports energy metabolism and acts as an antioxidant cofactor.
  • Copper: approximately 9.8mg (over 1,000% DV). Required for iron transport via ceruloplasmin and connective tissue formation (Linus Pauling Institute, Oregon State University).
  • Folate: approximately 290mcg DFE (73% DV). Naturally occurring folate, not folic acid.
  • Iron: approximately 4.9mg of total iron in a highly bioavailable food matrix.
  • Choline: approximately 333mg (61% of adequate intake). Involved in brain function, liver health, and cell membrane structure.
  • Selenium: approximately 39.7mcg (72% DV). Supports thyroid function and antioxidant defence.

No single multivitamin replicates this combination in its whole-food form. The nutrients in liver exist alongside cofactors that may influence absorption and utilisation, though the extent of this advantage over isolated supplements is still an active area of research (Pressman et al., Toxicology Research and Application, 2017).

Why Is Liver Called Nature's Multivitamin?

The term reflects the fact that liver provides a wide range of essential vitamins and minerals in a single food, at concentrations that rival or exceed most commercial multivitamin supplements. Most foods are rich in one or two nutrients but provide only modest amounts of others. Liver stands out because it functions as the body's metabolic processing centre in the living animal, storing and concentrating vitamins and minerals involved in energy production, detoxification, and blood formation.

This does not mean liver replaces a balanced diet. It means that as a single food, its nutrient density is difficult to match.

How Does the Vitamin A in Liver Compare to Plant Sources?

Vitamin A exists in two dietary forms. Preformed vitamin A (retinol) is found in animal foods such as liver, eggs, and dairy. Provitamin A (primarily beta-carotene) is found in orange and dark green vegetables and must be converted to retinol by the body before it can be used.

The conversion of beta-carotene to retinol is inefficient and highly variable. The standard ratio is approximately 12mcg of beta-carotene to 1mcg of retinol, but genetic factors can make this worse. Research has found that common variants in the BCMO1 gene can reduce conversion efficiency by 48-69% (Leung et al., Journal of Nutrition, 2012), and a substantial proportion of the population may carry one or more of these variants (American Journal of Clinical Nutrition, 2010). This does not mean people should assume they are affected or self-diagnose based on symptoms, but it does mean that for some individuals, relying solely on beta-carotene for vitamin A may result in suboptimal status. The retinol in liver bypasses this conversion entirely.

However, vitamin A from liver is very concentrated. A 100g serving provides well above the daily requirement and approaches the tolerable upper intake level of 3,000mcg RAE per day for adults set by the Institute of Medicine (NIH Office of Dietary Supplements). This means liver should be consumed in moderate portions, and daily consumption of large amounts is not recommended.

What Is the Difference Between Natural Folate and Folic Acid?

Folate is a B vitamin (B9) that occurs naturally in foods such as liver, leafy greens, and legumes. Folic acid is the synthetic form used in supplements and fortified foods. While both contribute to folate status, they are metabolised differently.

Folic acid must be converted to its active form (5-methyltetrahydrofolate) through a process involving the enzyme MTHFR. The CDC notes that MTHFR gene variants are common, with specific polymorphisms present in 10-25% of certain populations (CDC, MTHFR Gene Variant). People with these variants can still process folic acid, but some research suggests they may do so less efficiently (PMC, Adverse Effects of Excessive Folic Acid, 2025). The folate in beef liver occurs naturally in food, unlike the folic acid used in supplements and fortification. The CDC emphasises that most people with MTHFR variants can still process folic acid adequately, and the clinical significance of these variants for supplement choice remains an active area of research.

Folate is particularly important during pregnancy for preventing neural tube defects. Women who are pregnant or planning pregnancy should follow their healthcare provider's guidance on folate supplementation, which may include folic acid, regardless of dietary folate intake from foods like liver.

Why Is Choline Important and Where Does Liver Fit In?

Choline is an essential nutrient involved in brain function, liver health, cell membrane integrity, and methylation processes. Despite its importance, most adults do not consume enough. The adequate intake is 550mg per day for men and 425mg for women, rising to 450mg during pregnancy (NIH Office of Dietary Supplements).

Beef liver is one of the richest dietary sources of choline, providing approximately 333mg per 100g. Eggs are another significant source (approximately 147mg per egg), but few other common foods come close to liver's concentration.

Choline intake during pregnancy has received increasing research attention. A 2022 systematic review found that higher maternal choline intake was associated with modestly better child neurocognitive outcomes, though the authors noted the evidence base has limitations (Nutrients, 2022). A separate randomised controlled trial found that children whose mothers consumed higher choline during the third trimester showed improved sustained attention at age seven (FASEB Journal, 2022). Pregnant women should discuss their overall nutrition with their healthcare provider, particularly given the high vitamin A content of liver (see safety section below).

Can Liver Help with Vitamin B12 Status in Older Adults?

Vitamin B12 deficiency becomes more common with age. Estimates suggest that 10-15% of adults over 60 are B12 deficient, with some studies reporting higher rates depending on the diagnostic threshold used (Annual Review of Nutrition, 1999).

A key reason is age-related atrophic gastritis, in which the stomach lining thins and produces less acid. This reduces the body's ability to release B12 from food proteins before absorption. Research has found that atrophic gastritis is associated with significantly lower serum B12 and a higher prevalence of deficiency (American Journal of Clinical Nutrition, 2021).

Beef liver provides approximately 59mcg of B12 per 100g (over 2,000% of the daily value). For older adults who can tolerate it, liver or liver-based supplements may help support B12 intake. However, people with atrophic gastritis may still have difficulty absorbing protein-bound B12, and some may require crystalline B12 supplements or injections. B12 status should be assessed through blood testing (NIH Office of Dietary Supplements).

Why Did People Stop Eating Liver?

Liver was a regular feature of home cooking in New Zealand and around the world until the mid-20th century. The shift away happened gradually, driven by changes in food retail that favoured uniform muscle cuts, declining home cooking skills, and a cultural preference for milder-tasting protein. As organ meats moved to the margins of the food system, a significant nutrient gap opened, given that few common whole foods match liver's micronutrient density.

Freeze-dried liver capsules and powders have emerged as one solution to this taste barrier, offering a convenient way to access many of the nutrients found in liver without the flavour. The freeze-drying process removes moisture at low temperatures in a vacuum, which research suggests preserves the majority of heat-sensitive vitamins, though retention rates vary by nutrient and processing conditions (Foods, 2019).

Is Liver Safe for Everyone?

Liver is safe for most adults when consumed in moderate amounts as part of a varied diet. However, there are important considerations:

Vitamin A and pregnancy: The very high retinol content means excessive intake during pregnancy could pose a risk. The tolerable upper intake level for preformed vitamin A is 3,000mcg RAE per day for adults, and intake above this level has been associated with an increased risk of birth defects (NIH Office of Dietary Supplements). In New Zealand, the Ministry of Health advises pregnant women to eat no more than 100g of liver once a week (Ministry of Health NZ). Consult your healthcare provider about safe amounts.

Vitamin A and children: The tolerable upper intake level for vitamin A is lower for children than adults. Liver portions and supplement doses should be age-appropriate, and parents should check with their healthcare provider before giving liver supplements to children.

Iron overload conditions: People with haemochromatosis or other iron-loading disorders should avoid high-iron foods including liver without medical guidance.

Copper sensitivity: Liver is very high in copper. People with Wilson's disease or other conditions affecting copper metabolism should avoid liver.

Gout: Liver is high in purines and may not be suitable for people prone to gout.

Frequently Asked Questions

How often should you eat beef liver?

Many adults choose to consume liver occasionally, such as once or twice per week in portions of around 75-100g, due to its high vitamin A content. This provides meaningful micronutrient benefits while keeping vitamin A within safe limits. Capsule supplements are typically dosed to provide a smaller daily amount. The appropriate frequency depends on your overall diet and health status.

Is beef liver safe during pregnancy?

Liver provides folate and iron, both important during pregnancy, but its very high vitamin A (retinol) content means intake must be carefully managed. The tolerable upper intake level for preformed vitamin A during pregnancy is 3,000mcg RAE per day, and excessive intake has been associated with birth defects (NIH Office of Dietary Supplements). In New Zealand, the Ministry of Health advises pregnant women to eat no more than 100g of liver once a week (Ministry of Health NZ). Follow your healthcare provider's specific guidance.

Does freeze-drying destroy the nutrients in liver?

Freeze-drying is a low-temperature method that research suggests retains the majority of vitamins and minerals. A 2019 review found it generally outperforms heat-based drying for preserving heat-sensitive nutrients (Foods, 2019). However, freeze-drying generally retains a high proportion of vitamins and minerals, though retention varies by nutrient and processing conditions.

Is liver better than a multivitamin supplement?

Liver and multivitamins serve different purposes. Liver provides a broad range of nutrients in their whole-food forms, alongside cofactors that may support absorption. Multivitamins offer standardised doses of specific nutrients, which may be more appropriate for addressing confirmed deficiencies. A 2017 review noted that the bioavailability of micronutrients from supplements versus food is complex and nutrient-specific, with insufficient research to make broad generalisations (Pressman et al., 2017). Neither is inherently "better" than the other in all contexts.

How much liver is in a typical freeze-dried supplement serving?

This varies by product. Most freeze-dried beef liver capsules provide between 3-6g of liver equivalent per daily serving. This is substantially less than a 100g portion of fresh liver, so the nutrient amounts per serve are correspondingly lower. Check the product label for specific nutrient amounts per serving.

Can beef liver help with energy levels?

Liver provides several nutrients involved in energy metabolism, including B12, riboflavin, iron, and copper. If fatigue is caused by a deficiency in one of these nutrients, improving intake may help. However, fatigue has many potential causes, and liver is not a treatment for tiredness. If you are experiencing persistent fatigue, consider having your nutrient levels assessed through blood testing rather than self-supplementing.

Is beef liver high in cholesterol?

Yes. Beef liver contains approximately 275mg of cholesterol per 100g. Current dietary guidelines from most countries no longer set a specific numerical limit on dietary cholesterol, though they recommend keeping intake reasonable. For most people, moderate liver consumption is unlikely to be a concern, but those with cardiovascular conditions or lipid disorders should discuss dietary cholesterol with their healthcare provider.

This article is for informational purposes only and does not constitute medical advice. Nutrient needs vary between individuals, and dietary changes should be discussed with a qualified healthcare professional, particularly for pregnant women, children, older adults, and people with pre-existing health conditions.

Last reviewed: April 2026.

Looking for a whole-food source of the nutrients in beef liver? REGEN+ Organic Beef Organ Blend contains freeze-dried certified organic New Zealand beef liver and heart.

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