Injected intramuscularly into the arm, B12 shots also known as hydroxocobalamin can boost the level of this vitamin in your system, having an almost immediate effect
It should be pointed out that the words chosen for the title are also crucial
This could explain why some users report such dramatic improvements even in chronic injuries that had been resistant to other treatments

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The NHS confirms that taking up to 2mg (2000 micrograms) daily is unlikely to cause harm, with no established upper limit in the UK