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Your body cannot make vitamin B12
Two downstream consequences are mechanistically central: nicotinamide is preserved for re-entry into the NAD+ salvage pathway (raising intracellular NAD+ availability), and SAM is preserved for other methylation reactions
Most infants receive vitamin B12 through breast milk or infant formula
This method allows for direct absorption of the vitamin into the bloodstream, bypassing any potential absorption issues in the digestive system
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