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If you think you might have a vitamin B deficiency, your doctor can test your blood levels and discuss whether shots might be beneficial.

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10.1016/0003-9861(88)90487-0 6 AmjadS.NisarS.BhatA

An open-label, non-randomized study of the pharmacokinetics of the nutritional supplement nicotinamide riboside (NR) and its effects on blood NAD+ levels in healthy volunteers

After an initial loading regimen of 1mg three times weekly for two weeks, maintenance therapy is typically 1mg every three months for life in conditions like pernicious anaemia, or every two months if neurological involvement was present