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We measure, we understand, and we correct the underlying chemistry
A small number of people are allergic to B12, but this is rare
In that case, the doctor may prescribe vitamin injections or oral supplementation of the vitamin to increase its levels
Acneiform or skin changes have been reported with high-dose or frequent B12 administration, though the mechanism remains unclear
But the reality is far more nuanced, touching on everything from gastrointestinal physiology to the molecular stability of the peptide itself
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