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Because levels are often quite low before a deficiency is recognized, it can take some time for serum concentrations to even out and symptoms to subside
2022 Jun 1;13:20420188221102800
Older people, those with certain health issues, and those with diet problems might need them more often
Unapproved peptide products pose a growing public health risk, he said
We give weekly injections of 1000 mcg (1 ml) of vitamin B12 for the first 4-6 weeks
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