how long does it take vitamin b12 injections to work Quickly Do Shots Work? How Fast Does a Vitamin
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Some patients find that symptoms return before their scheduled injection and may benefit from slightly more frequent dosingthis should be discussed with your GP rather than self-adjusting treatment intervals

Intramuscular injection is the most common method, where we inject the vitamin directly into a muscle, usually in your upper arm or buttock
2008 May;66(5):250-5