A 2020 study found that high blood concentrations of vitamin B12 may be linked to an increased risk of all-cause mortalityyikes (8)

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Improvement in Blood Test Results The B12 vitamin results from your laboratory tests answer the question about its work duration
But they will find that doctors wont want to deviate from NICE guidelines. Dr Richard Cook, a GP in West Sussex said there was no doubt that B12 injections were delayed or stopped during the initial pandemic as it was deemed non essential