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Formulations of cyanocobalamin injection containing benzyl alcohol as a preservative should also be avoided in premature neonates and those with hypersensitivity due to its association with gasping syndrome (10-12)
You can buy the supplements to swallow as pills, to dissolve under your tongue, or as nasal sprays
So when a medic says that someone with PA "can use the stored B12 in their liver", as far as I know, we simply don't know whether this is true or not
To understand why this matters, you need to understand what NNMT does
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