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If serum B12 is below 300 pg/mL, further testing is warranted
Symptoms of B12 deficiency can appear in years because the body naturally stores the vitamin in the liver
doi: 10.1016/j.ceb.2019.12.006 50 TriccoACLillieEZarinWOBrienKKColquhounHLevacDet al
A vial punctured 17 months into its 18-month shelf life carries a multi-dose window capped at the manufacturer expiration (roughly 30 days, in that case), not the full 28-day post-puncture window if those overlap
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