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The compound works at the cellular level, requiring time for metabolic changes to translate into visible physical improvements

Blood pressure changes can also be a potential side effect

The most common side effect is irritation at the site of injection which could last up to 5-10 minutes

High-dose oral B12 supplements are available over the counter for a few dollars per month, while injection visits typically involve copays, administration fees, and the time cost of repeated clinic appointments

This article explains how these injections work, their benefits and risks, and how they compare to taking B12 in pill form