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In some cases a B12 deficiency is linked with symptoms like nausea, bloating, or loss of appetite

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This is why many people start with 10mg vials and transition to 30mg vials once they reach 5mg per week or higher

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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