why do b12 injections hurt Vitamin Injections: Good or Bad? A vitamin B12 deficiency was

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However, in very rare cases, some people can experience side effects caused by allergic reactions or sensitivity ( If you experience any side effects, speak with your doctor

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One of the things they found was when B12 serum levels drop below 550 pg/mL, cerebrospinal fluid levels of vitamin B12 become low

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After it's released into your system, B12 combines with another molecule called the intrinsic factor that aids its absorption into the small intestine