Vitamin B12 is needed metabolism of nutrients. It is needed to prevent anemia. A deficiency of vitamin B12 can cause pernicious anemia and nerve damage. Vitamin B12 overdose appears to have no toxic effects.
Sources of Vitamin B12:
| Food / 100g | Amount (µg) |
| Lamb’s liver | 54 |
| Nori seaweed, dried | 27.5 |
| Steamed mussels, shelled weight | 22 |
| Oyster, shelled weight | 17 |
| Sardines, canned in oil, drained | 15 |
| Grilled herring | 15 |
| Anchovies, canned, drained | 11 |
| Rabbit meat | 10 |
| Steamed scallops | 9 |
| Cooked prawn | 8 |
| Grilled skate | 8 |
| Steamed salmon | 6 |
| Tuna, canned in oil, drained | 5 |
| Eggs | 2.5 |
| Lean beef | 2 |
| Cheddar cheese | 1.1 |
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