b12 injection reasons Are Shots Safe? Royal Palm Beach Medical Group Vitamin B12: What It Is,
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Lebovitz HE

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About 60% of the dose is eliminated via urine, less than 1% is excreted unchanged and the rest is eliminated through the bile in the feces modified

NICE and BNF Guidance: You correctly point out that even official guidance from NICE and the BNF acknowledges that some individuals may require more frequent injections