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Importantly, functional B12 deficiency can sometimes coexist with high total B12 levels, especially in kidney disease, and may require additional testing with methylmalonic acid (MMA) or holotranscobalamin if deficiency is suspected clinically
Some people are prescribed B12 this way
The prescribing information allows a 96-hour window, four full days, to administer a missed dose
Excessive persistent foam suggests aggressive handling that may have damaged the peptide
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