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MTHFR and Vitamin B12 Absorption The MTHFR genetic mutation has a negative effect on B12 absorption, with studies showing an increased prevalence of low blood levels of vitamin B12 in those with the mutation
Luhby AL, Cooperman JM, Donnenfeld AM, Herrero JM, Teller DN, Wenig JB
Compounding and the FDA: Information for Consumers
Its molecular target is nicotinamide N-methyltransferase (NNMT), a cytosolic S-adenosyl-L-methionine-dependent methyltransferase that converts nicotinamide to 1-methylnicotinamide, consuming SAM and releasing S-adenosylhomocysteine
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