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Side effects during the first week at 1.0 mg can be more noticeable than previous increases

There is also some limited evidence suggesting that individuals who carry certain polymorphisms in genes involved in vitamin C transport and detoxification mechanisms may have lower plasma vitamin C concentrations even with high vitamin C intakes (see also Vascular complications of diabetes mellitus) (reviewed in 27)

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Nicotinamide N-methyltransferase (NNMT) is a cytosolic enzyme that catalyzes the methylation of nicotinamide using S-adenosylmethionine (SAM) as a methyl donor, producing 1-methylnicotinamide (1-MNA) and S-adenosylhomocysteine (SAH)