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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

Vitamin B12 is vital for several important bodily functions

Browse related peptide guides Dr Rimas Geiga Learn more about the clinics medical adviser with interests in metabolism, nutrition and healthy ageing