Vitamin B12 foods: the best sources and how much Vitamin B12 each has
By Vita · fact-checked against NIH ODS
Vitamin B12 (cobalamin) is a water-soluble nutrient your body cannot make on its own, so it has to come from your diet. It occurs naturally almost exclusively in animal-derived foods — meat, fish, shellfish, poultry, eggs, and dairy — because it is produced by bacteria and concentrated up the food chain. Plant foods contain virtually none unless it has been added, which makes fortified foods and supplements the practical route for vegans and many vegetarians. This guide lists the richest real-world sources with per-serving amounts drawn from the NIH Office of Dietary Supplements, so you can see exactly how much B12 a normal portion delivers against the 2.4 mcg Daily Value.
Most adults need about 2.4 mcg of Vitamin B12 a day (no upper limit is established). Before stacking supplements, run your dose through the free Safety Checker.
Best food sources of vitamin b12
| Food | Vitamin B12 per serving |
|---|---|
| Beef liver, cooked, pan fried | 70.7 mcg per 3 oz |
| Clams, cooked (without shells) | 17 mcg per 3 oz |
| Salmon, Atlantic, cooked | 2.6 mcg per 3 oz |
| Ground beef, 85% lean, pan browned | 2.4 mcg per 3 oz |
| Milk, 2% milkfat | 1.3 mcg per 1 cup |
| Fortified breakfast cereal (25% DV) | 0.6 mcg per serving |
| Egg, whole, cooked | 0.5 mcg per 1 large egg |
Amounts from the NIH ODS Vitamin B12 fact sheet. Serving sizes vary; treat these as typical, not exact.
Why vitamin b12 matters
Vitamin B12 is essential for forming healthy red blood cells, synthesizing DNA, and keeping your nervous system working properly. It acts as a cofactor for enzymes that build the protective myelin sheath around nerves and that convert homocysteine into methionine, helping keep homocysteine levels in check. When you fall short, red blood cell production goes wrong and cells become large and immature — a condition called megaloblastic anemia — producing fatigue, weakness, and shortness of breath. Prolonged deficiency can damage nerves, causing tingling or numbness in the hands and feet, balance problems, memory trouble, and mood changes, some of which can become permanent if untreated. Because the body stores a few years' worth of B12 in the liver, symptoms often appear slowly, but older adults, people with pernicious anemia or digestive disorders, those who have had GI surgery, long-term metformin or acid-reducer users, and anyone eating a strict plant-based diet are at higher risk and benefit most from reliable dietary sources or supplements.
Read the full Vitamin B12 guide › — what it does, how much you need, and how much is too much.
Wondering if Vitamin B12 is your gap?
The free 2-minute Vitaminico check reads your symptoms and names your most likely gap — food-first, no pills pushed.
Vitamin B12 foods FAQ
How much vitamin B12 do I need each day?
The recommended dietary allowance (RDA) is 2.4 mcg per day for most adults, rising to 2.6 mcg during pregnancy and 2.8 mcg while breastfeeding, according to the NIH Office of Dietary Supplements. The Daily Value used on food labels is 2.4 mcg.
What foods have the most vitamin B12?
Animal foods dominate. Beef liver leads by a wide margin at about 70.7 mcg in a 3-ounce serving, followed by clams (17 mcg), bluefin tuna (9.3 mcg), and salmon (2.6 mcg). Meat, poultry, eggs, milk, and cheese all contribute meaningful amounts as well.
Can vegans and vegetarians get enough B12 from food?
Naturally occurring B12 is essentially absent from plant foods, so vegans should rely on fortified foods such as fortified nutritional yeast (8.3 to 24 mcg per quarter cup), fortified breakfast cereals, and fortified plant milks, or take a supplement. Vegetarians who eat eggs and dairy get some B12 but may still fall short and should check their intake.
What are the signs of vitamin B12 deficiency?
Common signs include fatigue, weakness, and megaloblastic anemia, plus neurological symptoms like numbness or tingling in the hands and feet, difficulty with balance, memory problems, and a sore, red tongue. Because symptoms build gradually and can become irreversible, anyone at risk should ask their doctor about testing.
Can you get too much vitamin B12?
The NIH has not set an upper limit for vitamin B12 because it has very low potential for toxicity. The body absorbs only what it needs and excretes the excess in urine, so high intakes from food or supplements are not associated with harm in healthy people.
Does cooking destroy vitamin B12 in food?
Vitamin B12 is reasonably stable, but some is lost with high heat and prolonged cooking, and it can leach into cooking liquid. Gentle cooking methods and consuming the juices (as in soups or stews) help preserve more of it. The per-serving amounts in this guide reflect cooked foods as measured by the USDA.
Vitaminico for iPhone
Build your food-first plan in the app
- A free 2-minute chat with Vita reads your symptoms — no food-logging, no needles
- Your top 3 likely nutrient gaps across the vitamins and minerals that matter
- A food-first plan: what to eat, where to get it, and what to skip
- No signup wall — the full check works the moment you open the app
Free · iPhone · no email to start
Educational, not medical advice. Per-serving amounts are typical values from the NIH and vary with brand, preparation and portion. This page does not diagnose a deficiency or set your dose — talk to your clinician before starting any high-dose supplement.