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Any disruptionLow stomach acid (hypochlorhydria), parietal cell loss (atrophic gastritis), IF deficiency (pernicious anemia), or ileal disease (Crohns)can compromise absorption, leading to deficiency risk

NNMT catalyzes the transfer of a methyl group from S-adenosyl-L-methionine to nicotinamide, influencing intracellular nicotinamide availability and interacting with NAD-associated metabolic processes

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Each occupies a distinct mechanistic and application niche, and the formulation considerations differ meaningfully between them

Present with mild fatty liver disease or signs of poor hepatic detoxification