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B12 content in different types of meat according to the National Institutes of Health Office of Dietary Supplements.
| Meat source | B12 content, mcg/100 grams |
| Shellfish | 98.9 |
| Mackerel | 19 |
| Beef | 6 |
| Trout | 3.8 |
| Salmon | 2.4 |
| Tuna | 1.6 |
| Milk | 0.9 |
| Turkey | 0.8 |
| Egg | 0.6 |
| Pork | 0.4 |
| Chicken | 0.3 |
