Product Description
Before multivitamins existed, athletes and warriors ate organ meat. Liver in particular has been prized across cultures for thousands of years — not out of tradition, but because nothing else delivers this concentration of bioavailable nutrients in a single food. Gram for gram, beef liver is one of the most nutrient-dense things you can put in your body, and the nutrients it contains are the exact ones endurance athletes tend to deplete fastest.
WonderCow Grass Fed Beef Liver Capsules deliver 3,000mg of pure grass-fed and grass-finished bovine liver per serving — no fillers, no additives, just desiccated liver from the highest-quality cows, tested for pesticides, glyphosate, and heavy metals. With a hint of mint for palatability, it's the simplest way to get what your training is quietly burning through.
Carry More Oxygen to Working Muscles – The heme iron in beef liver is the most bioavailable form of iron available, absorbing at two to three times the rate of plant-based sources. Your body uses it to build hemoglobin — the protein in red blood cells that delivers oxygen to working muscles — so more functional iron means better aerobic capacity and less of the fatigue that feels like heaviness, not tiredness.
Turn Food Into Energy More Efficiently – Beef liver delivers the full B vitamin complex — B1, B2, B3, B6, B12, and folate — all in their natural, food-based form. These are the co-factors your cells need to convert carbohydrates and fats into usable energy. B12 in particular supports red blood cell formation and neurological function, and the food-based form here absorbs better than most synthetic B12 supplements on the market.
Fill the Gaps That Hard Training Opens – Beef liver is the richest animal-based source of preformed Vitamin A for immune defense and hormone regulation, plus copper for energy production and connective tissue integrity, choline for cognitive function and fat metabolism, and selenium to neutralize the oxidative stress that heavy training generates. One food. No synthetic additives. Everything your training is using up.
How to Use WonderCow Grass Fed Beef Liver Capsules
Daily Dose: Take 4 capsules daily with 8 oz of water.
Timing: Any time of day works. With food is recommended to support iron absorption and minimize any digestive sensitivity when starting out.
Pro Tip: If you're new to organ supplements, start with 2 capsules daily for the first week and build up to the full dose. Pair with a vitamin C source to further enhance heme iron absorption.
Beef liver is consistently identified as one of the best whole-food supplements for endurance athletes — particularly those managing iron levels, recovering from heavy training blocks, or looking to fill nutritional gaps without stacking multiple individual micronutrient supplements. WonderCow's grass-fed and grass-finished sourcing, 3,000mg serving size, and clean two-ingredient formula make it one of the simplest and most complete options available.
Supplement Facts
30 Servings
Serving Size: 4 Capsules
Serving Per Container: 30
| Amount Per Serving | ||
|---|---|---|
| % Daily Value* | ||
| Calories 10 | ** | |
| Protein 2g | ** | |
| Grassfed Liver (Bovine) 3000mg | ** | |
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
** Daily Value (DV) not established
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We do not accept returns on food items that have been opened, but we will issue a store credit if you are unsatisfied. In the event of a return, you must first contact us before sending back a return shipment.
Consumable products over $40 receive a 50% store credit. This includes specialty nutrition products such as ketones or supplements/vitamins.
WonderCow Grass Fed Beef Liver Capsules FAQ's
Everything you need to know about WonderCow Grass Fed Beef Liver Capsules.
Beef liver is the most nutrient-dense whole food on the planet — a single serving contains meaningful amounts of Vitamin A, Vitamins B1, B2, B3, and B12, heme iron, copper, folate, choline, phosphorus, selenium, and complete protein. For endurance athletes specifically, it addresses three of the most common nutritional gaps that quietly kill performance: iron deficiency that leads to fatigue and reduced oxygen delivery, B-vitamin depletion from high training volume that impairs energy metabolism, and low Vitamin A which compromises both immune function and hormone balance. WonderCow puts 3,000mg of pure grass-fed bovine liver into four capsules — no fillers, no additives, just the organ.
Iron comes in two forms: heme iron from animal sources and non-heme iron from plants. Heme iron — the kind found in beef liver — is absorbed by your body at 15–35% efficiency. Non-heme iron from spinach, legumes, and fortified foods absorbs at just 2–20%, and is further blocked by compounds in coffee, tea, and many high-fiber foods athletes eat constantly. For runners and cyclists who lose iron through foot-strike hemolysis, sweat, and GI bleeding during long efforts, heme iron from liver is simply the most efficient way to replenish what training takes out.
Vitamin A — found in beef liver at levels no plant food can match — supports three things that matter directly to training athletes: healthy vision (especially relevant for early morning and night training), immune system function (critical during high-volume training blocks when the immune system takes a beating), and hormone metabolism. In men, Vitamin A supports healthy testosterone production. In women, it supports healthy estrogen metabolism. These aren't cosmetic benefits — hormone balance directly affects recovery, muscle repair, and training adaptation.
Take 4 capsules daily with 8oz of water. Most athletes take them with a meal — with food improves tolerability and supports absorption of the fat-soluble nutrients like Vitamin A, which require dietary fat to be absorbed properly. Daily consistency is what matters: liver's benefits for iron stores, B-vitamin status, and hormone support build over weeks of regular use rather than acutely.
Yes. Grass-fed and finished cattle have a meaningfully different nutritional profile compared to grain-finished animals: higher omega-3 to omega-6 ratio, higher Vitamin A content from beta-carotene in grass, and higher CLA (conjugated linoleic acid) levels. Grain-finishing shifts the fat profile toward inflammatory omega-6s and reduces fat-soluble vitamin density. For a product where the entire benefit is the nutritional content of the liver itself, sourcing quality is the product. WonderCow also tests for pesticides, glyphosate, and heavy metals — important for organ meats, which concentrate toxins from the animal's environment.