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How Quickly Do B12 Shots Work? Defy Medical Vitamin B12 Deficiency Vitamin B12 deficiency happens when the body does not have enough vitamin B12. Vitamin B12 is important for making healthy red blood cells and keeping nerves If you have a low vitamin B12 level, injections can go a long way toward improving your health and well being. But if your B12 level is normal, don't fall for claims that B12 Injection Dose for Adults: Dosage & Frequency B12 Injections: Who Should Get Them and How Long Do They Last?
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