Why your ancestors knew something we forgot: the nutritional case for organ meats

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Introduction

For most of human history, eating an animal meant eating all of it — organ meats first. The liver, heart, kidneys, and other offal were prized for their exceptional nutrition and often given to pregnant women, children, and those recovering from illness. In many traditional cultures across Europe, Africa, Asia, and the Americas, organ meats were revered not just for their accessibility but for their obvious, tangible effects on strength, fertility, and resilience.

Then, in the mid-20th century, particularly after the Second World War, something shifted. Organ meats nearly vanished from Western diets. Today most people have never eaten liver, let alone kidney or heart. We’ve reframed them as undesirable “throwaway” cuts, when actually the opposite is true: organ meats are among the most nutrient-dense foods on the planet.

The reason isn’t complicated. It’s just been forgotten.

The nutrient density gap

Let’s be direct: organ meats contain substantially higher concentrations of vitamins and minerals than muscle meat, the cuts we typically eat today.

Compare beef liver to beef muscle meat. A 100-gram serving of liver provides approximately 2,715% of the daily value for vitamin B12—compared to just 50% from an equivalent serving of muscle meat. For copper, the difference is even starker: liver delivers around 1,588% of the daily value; muscle meat, roughly 10%.

This isn’t marginal. It’s a difference of orders of magnitude.

Liver is also exceptionally rich in:

• Vitamin A (retinol) — the preformed, highly bioavailable form your body uses directly
• B-complex vitamins — B2, B3, B5, B6, B9 (folate), and B12, all essential for energy metabolism, nervous system function, and methylation
• Iron — and crucially, in a form your body absorbs readily (see below)
• Selenium — an often-overlooked mineral critical for thyroid health and antioxidant defence
• Choline — increasingly recognised as essential for liver health and cognitive function itself

Research from institutions including the American Journal of Clinical Nutrition and the PMC database confirms: liver consistently ranks as the single most nutrient-dense whole food available. By some measures, a small serving of organ meat delivers more bioavailable micronutrients than an entire week’s worth of muscle meat and vegetables combined.

Why bioavailability matters

Nutrient density on paper is one thing. But the form the nutrient takes—and how efficiently your body absorbs it—is equally important.

Organ meats excel here too.

Consider iron. Liver is rich in heme iron, the iron form found in animal tissue. Heme iron is absorbed through a separate, efficient pathway in the intestines and achieves absorption rates of 15–40% regardless of other dietary factors. Non-heme iron, the form found in plants and fortified grains, is absorbed at much lower rates (2–20%) and its absorption is easily hindered by compounds like phytic acid and calcium in the same meal.

The same principle applies to B12. The B12 in liver is already in its active, methylated form and is bound to animal proteins in a way that makes it highly absorbable. Plant-based B12 analogues and even poorly absorbed synthetic forms simply cannot match this efficiency.

Liver also supplies fat-soluble vitamins (A, D, E, K) in forms your body recognises immediately, alongside the dietary fat needed to absorb them. The nutrient package is, quite literally, complete.

Historical and anthropological context

This wasn’t accidental. Ancestral and traditional cultures didn’t eat organ meats because they were cheap (though they often were). They ate them because they worked—because visible outcomes like clear skin, strong teeth, robust immunity, and reproductive success were directly correlated with organ meat consumption, particularly during pregnancy and childhood.

Across cultures—from traditional Inuit to pastoral African groups to pre-industrial European populations—organ meats were distributed preferentially to vulnerable groups: pregnant and nursing women, children, and those recovering from illness or injury. This distribution pattern persists even today in cultures where organ meat traditions remain; it reflects an intuitive, generations-tested understanding of their nutritional power.

Anthropological and archaeological evidence also suggests that access to nutrient-dense organ meats was a key factor in human brain development and survival during nutritionally challenging periods. This isn’t speculation; it’s written into our metabolism. Your liver needs B12, selenium, and choline to function optimally. Your brain needs heme iron and folate. These nutrients didn’t become important recently—they’ve been essential throughout human evolution.

The practical takeaway

The challenge with organ meats today isn’t their nutrition—it’s sourcing and preparation. Grass-fed, grass-finished organ meats from regeneratively raised cattle are harder to find and more time-consuming to cook than a chicken breast or ground beef.

This is where consistency becomes the real lever. You don’t need to eat organ meats daily. A modest serving—roughly 4 ounces per week, or about the size of a deck of cards—delivers a meaningful micronutrient boost that can take weeks or months of eating conventional muscle meat to approach.

For those who find sourcing, storing, or preparing organ meats difficult, freeze-dried organ meat supplements capture the same nutrient profile in a straightforward daily capsule. The freeze-drying process preserves the nutrient density while making the dose accessible and consistent.

Whether fresh or supplemented, the principle is the same: bringing organ meats back into your routine—not as a chore, but as a small, deliberate step towards nutritional completeness.

Where the product fits

Bio-Avail Organ contains a five-organ blend—liver, heart, kidney, pancreas, and spleen—sourced from 100% grass-fed, grass-finished New Zealand cattle. Each organ brings a distinct nutrient profile: liver for B vitamins and retinol, heart for CoQ10 and taurine, kidney for selenium, pancreas for trace minerals, and spleen for immune support. A daily serving is equivalent to consuming about 4 ounces of fresh organ meat per week, aligning with the amount most nutrition experts recommend for sustained micronutrient support.

Medical disclaimer

This article is for educational purposes and isn’t medical advice. Supplements aren’t a substitute for a varied diet or medical care. If you’re pregnant, breastfeeding, taking medication, or managing a health condition, speak to your GP or a registered professional before starting anything new.

Sources

1. Healthline (2024): “Organ Meats Are Incredibly Nutritious and Healthy” — Comprehensive nutritional breakdown of organ meats including bioavailability data. Read the article

2. PMC 3417664 (2012): “Level of selected nutrients in meat, liver, tallow and bone…” — Comparative nutrient analysis showing liver’s superiority in vitamins A, B-complex, vitamin C, iron, and selenium. Read the full study

3. PMC 9219084 (2022): “Iron Absorption: Factors, Limitations, and Improvement Methods” — Heme iron bioavailability (15–40% absorption) versus non-heme iron (2–20%) and the separate, efficient intestinal pathway for heme iron. Read the full study

4. MDPI Nutrients 17(13), 2132 (2024): “Dietary Heme Iron: A Review of Efficacy, Safety and…” — Evidence that heme iron absorption occurs through a separate pathway independent of non-heme iron absorption competition. Read the full study

5. PMC 11435426 (2024): “Nutrient Analysis of Raw United States Beef Offal Items” — Quantitative analysis confirming beef liver as an exceptional source of vitamin A and supporting micronutrient recommendations. Read the full study

6. PMC 10105836 (2023): “The role of meat in the human diet: evolutionary aspects and…” — Anthropological and evolutionary context for organ meat consumption in human nutrition and development. Read the full study