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Most are animal sources (milk, egg yolks, yogurt, salmon, tuna, beef) which is why vegetarians and vegans have a higher risk of being deficient (3)
Vitamin B12 (also known as cobalamin) is a water-soluble vitamin that plays a key role in: Normal red blood cell formation Normal energy-yielding metabolism Function of the nervous system Reduction of tiredness and fatigue DNA synthesis Normal psychological function In the UK, these are recognised health claims for vitamin B12 under authorised nutrition and health regulations
This depends on how severe the deficiency is, any health conditions, and how well the therapy works
Drug interactions: Certain medications, such as omeprazole, lansoprazole, cimetidine, and metformin, can lead to low vitamin B12 levels
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