NAD + bụ coenzyme dị mkpa na usoro ndụ cellular, na-arụ ọrụ etiti na metabolism ike, mmezi DNA na mgbochi ịka nká, nzaghachi nrụgide cellular na njikwa akara, yana neuroprotection. Na metabolism ike, NAD + na-arụ ọrụ dị ka isi ihe na-ebu elektrọn na glycolysis, okirikiri tricarboxylic acid, na mitochondrial oxidative phosphorylation, na-anya njikọ ATP na inye ike maka ọrụ ekwentị. N'otu oge ahụ, NAD + na-eje ozi dị ka ihe dị mkpa maka DNA mmezi enzymes na activator nke sirtuins, si otú ahụ na-ejigide genomic kwụsie ike na-enye aka na ogologo ndụ. N'okpuru ọnọdụ nke nrụgide oxidative na mbufụt, NAD + na-ekere òkè na ụzọ akara na ụkpụrụ calcium iji chekwaa homeostasis cellular. Na usoro ụjọ ahụ, NAD + na-akwado ọrụ mitochondrial, na-ebelata mmebi oxidative, ma na-enyere aka igbu oge mmalite na ọganihu nke ọrịa neurodegenerative. Ebe ọ bụ na ọkwa NAD + na-agbadata n'ụzọ nkịtị na afọ, a na-amata usoro iji dowe ma ọ bụ kwalite NAD + dị ka ihe dị mkpa maka ịkwalite ahụike yana ibelata ịka nká.