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why is vitamin b12 injection painful deficiency causes, signs & management: Vitamin B12 deficiency means the body does not have enough vitamin B12 to make healthy red blood cells and support nerve function. It can cause prefilled vitamin b12 injections Treatment Options:Single Injection vitamin b 12 injectable

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It may offer potential benefits based on practitioner experience and emerging research

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Treatment Options:Single Injection

Pernicious anemia is a separate case worth mentioning on its own