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NHS B12 injections are prescribed for documented deficiency or malabsorption conditions including pernicious anaemia, gastrointestinal disorders affecting absorption, previous gastric surgery, and when neurological symptoms are present
B12 supports nerve function and red blood cell production, which relate to mental clarity and steady energy
Maintenance is usually monthly, though some people do better on a biweekly schedule
No completed human efficacy trial of the fragment exists
People with chronic kidney or liver disease can accumulate B12 due to lower detoxification function when these organs are impaired
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