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A key FDA advisory committee vote could bring clarity to the biohacking and alternative medicine world

Vitamin B12 is essential for your nerves, red blood cells, and energy levels

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