Chicken Liver

Food · Protein · Food, Typed Supps

One small serving of chicken liver packs more vitamin A, B12, and iron than a whole day's worth of most other foods — which is exactly why it's a once-in-a-while food, not an everyday one.

Stage by stage

Chewing & Swallowing (Mouth): Chewing releases chicken liver's iron and B-vitamins from its dense tissue, while saliva begins breaking down its proteins.
Stomach Breakdown (Stomach): Stomach acid unlocks heme iron from myoglobin and denatures proteins, freeing amino acids and fat-soluble vitamin A for absorption.
Intestinal Absorption (Small intestine): In the small intestine, heme iron, B12 (bound to intrinsic factor), and retinol are absorbed far more efficiently than the plant-based, non-heme forms of these same nutrients.
Storage & Circulation (Blood & liver): Absorbed retinol travels to the body's own liver for storage, while B12 and iron enter the bloodstream to support red blood cell production and oxygen transport.

Timing

Because vitamin A is fat-soluble, eating chicken liver alongside a source of dietary fat improves absorption of its retinol content.

Time to effect

Weeks: Regularly eating iron- and B12-rich foods like chicken liver can begin improving markers of deficiency anemia within a few weeks, though full repletion of iron stores can take two to three months.

Allergens

None of the fourteen major allergens. Derived from what this food is, not from a product label.

Eating patterns

Fits: Keto, Low-FODMAP, Gluten-free. Depends on the product: Halal, Kosher.

Satiety

142 on the satiety index, where white bread is 100 — moderate. Modelled from the Holt et al. (1995) measurements.

Environmental footprint

9.9 kg CO2e and 660 litres of freshwater per kg, matched to "Poultry meat" in Poore & Nemecek (2018), Science 360.

Cost band

Mid — roughly £7 per kg, as a band midpoint rather than a price.

Key nutrients

Nutrition per 100g

Calories: 178.3
Protein: 20.2g
Carbohydrate: 0g
of which sugars: 0g
Fat: 10.9g
of which saturated: 5.4g
Fibre: 0g
Sodium: 115mg

Food vs. supplement

Chicken liver provides vitamin A, B12, iron, and folate in highly bioavailable, naturally co-occurring forms, but its vitamin A is so concentrated that a single 100 g serving (about 442% DV) can approach or exceed the adult daily upper limit — making it a food to enjoy occasionally rather than lean on daily the way one might a low-dose multivitamin.

Kitchen tip

Cook chicken liver to at least 165°F (74°C) internal temperature — a quick pan-fry with onions balances its rich, mineral-forward flavor while eliminating bacteria like Salmonella and Campylobacter that raw poultry liver can carry.

Common myth

"Liver is full of toxins the animal was trying to filter out, so eating it just dumps those toxins into your body." In reality: The liver metabolizes and excretes toxins rather than storing them like a filter trap; properly inspected and cooked chicken liver carries no meaningful toxin burden. Its real, well-documented risk is nutritional excess — specifically vitamin A, whose adult Tolerable Upper Intake Level of 3,000 mcg/day a single serving can approach or exceed — not accumulated toxins.