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The question is are these claims valid and if so what are some reasons b12 shots would not actually live up to their potential

[3] Functions of Vitamin B12 Although daily B12 requirements are fairly low (just 2.4 micrograms for teenagers and adults [4] ), it plays a crucial role in metabolic and cellular processes

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While these typically subside within a few days, you should always notify your doctor just in case, Wirtz says