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Vitamin B12 helps your body produce red blood cells, which carry oxygen to your tissues

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It helps create myelin, the protective layer that coats nerves

The solution must be aliquoted into single-use portions before freezing

In the UK, adults with confirmed B12 deficiency and neurological symptoms typically receive hydroxocobalamin injections1 mg intramuscularly on alternate days until symptoms stabilise, followed by maintenance doses every two months