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NNMT is a cytosolic S-adenosyl-L-methionine-dependent methyltransferase that converts nicotinamide to 1-methylnicotinamide, spending SAM and diverting nicotinamide away from the NAD+ salvage pathway
At least they are provided with reference ranges
Vitamin B12 has a very low toxicity profile, and there is no established upper limit for intake in the UK, as excess amounts are typically excreted in urine
Presented for research literature review only Rutter J et al
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