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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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Most patients feel only a brief pinch or mild stinging sensation, and the discomfort is minimal and short-lived
Possible Long-Term Risks of Vitamin B12 Does b12 give you energy right away
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541548., doi:10.1038/ejcn.2014.46
