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Why Some People Cant Convert B12 Effectively Up to 4050% of the population carries genetic polymorphisms (MTHFR C677T, A1298C) that impair their ability to convert B12 effectively
A body might react adversely to B12 shots for a variety of reasons
The force can damage peptide structure
If the problem persists, see your doctor
While doctors can, in certain circumstances, prescribe non-FDA-approved drugs, this is extremely rare
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