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It may be difficult to determine the exact time when your vitamin B12 injections have started working, as many people will report noticing a difference in their energy levels within a few days following the shot, and others may not feel the increase in energy for multiple weeks if their body needs the vitamin to build up a bit more
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Once in the body, vitamin B12 supports various metabolic processes and is a co-factor in fat and carbohydrate metabolism
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