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**Common Side Effects (may affect up to 1 in 10 people):** * Injection site reactions: Pain, redness, swelling at the injection site
In this article youll learn why supplements and injections raise B12 and why that is harmless, how B12 travels in the blood and why a total number can mislead, what an unexplained elevation can point to, what functional deficiency means despite a high result, what a doctor does next, and when to seek advice
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