This depends on your nutritional needs but, generally, B vitamin supplements are formulated to provide much more than you need and this can be a problem for the three B vitamins that can cause toxicity niacin, folate and B-6
Drug Interactions: Certain medications, like metformin and stomach acid reducers (PPIs), can interfere with B12 absorption from food, which may increase the need for injections
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Getting started with B12 injections at CardioMender, MD is simple
[DOI] [PMC free article] [PubMed] [Google Scholar] 31.Motohashi H, Inui K
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