disadvantages of vitamin b12 injections How Long Do The Side Effects Last Why do I feel so bad after a B12 injection? B12 Shots: Vitamin B12 Injections

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In a healthy body, when you stand up, baroreceptors (specialized nerves in your blood vessels) instantly detect the drop in blood pressure and signal your sympathetic nervous system to constrict the blood vessels, pushing blood back up to your brain

Any excess gets excreted in the urine

It helps ensure that your body continues to receive what it needs

What is not normal is a reaction that is severe, that gets worse rather than better over two to three days, or that involves your chest, breathing or a spreading rash