While true deficiency can cause serious problems, many people end up taking doses far higher than they need
Timeline of B12 Injection Benefits The speed at which youll experience benefits from Vitamin B12 injections can vary depending on several factors
Most injections use B6 and B12
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When stratified by administration route, the mean percentage changes were: Intramuscular (IM): 307% Oral: 285% Sublingual: 199% IM administration showed the highest average B12 increase, although oral and sublingual routes also yielded substantial improvements, supporting their use as effective and less invasive alternatives
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