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The lack of preservatives allows bacterial contamination and degradation to occur more rapidly
B12 supplements are the practical way to treat B12 deficiency
this prevents metabolic bottlenecks that might occur if one B vitamin is lacking
In some cases, especially at the beginning of treatment for a severe deficiency, injections might be given more frequently (e.g., daily or every other day) for a short period before transitioning to a maintenance schedule
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