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Will insurance cover B12 shots
Long-term human safety data not established
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A 2025 European Journal of Clinical Nutrition commentary on the NICE guideline argued that the diagnostic threshold and clinical awareness still need to be tightened further, especially around pernicious anaemia, which is still under-recognised in primary care
That said, research has not confirmed that taking doses of vitamin B-12 or methionine above the recommended amount helps a person lose weight
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