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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
There is no tolerable upper intake level (UL) set for vitamin B12, so you technically cant take too much
Patients sometimes ask whether a 5th injection would extend the benefit
However, clinical conditions associated with high B12 are uncommon
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