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It is difficult to give a one-size-fits-all answer to the question, "How long does it take for B12 injections to work." It is possible for some individuals to notice the improvement in their symptoms right away, whereas, for others, it may take additional injections to achieve optimal health

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While generally safe, it is important to be aware of potential drug interactions

2021;422 doi: 10.1016/j.cej.2021.130147

This gives athletes and support personnel sufficient time to make themselves aware of the changes, review any medications they use on Global DRO, and apply for a Therapeutic Use Exemption (TUE) if required before the updated List comes into effect on 1 January 2025