I-NAD + yi-coenzyme ebalulekileyo kwiinkqubo zobomi beselula, idlala indima ephambili kwi-metabolism yamandla, ukulungiswa kwe-DNA kunye nokuchasana nokuguga, impendulo yoxinzelelo lweselula kunye nommiselo wesignali, kunye ne-neuroprotection. Kwimetabolism yamandla, i-NAD+ isebenza njengomphathi ophambili we-electron kwi-glycolysis, umjikelo we-tricarboxylic acid, kunye ne-mitochondrial oxidative phosphorylation, ukuqhuba i-ATP synthesis kunye nokubonelela ngamandla kwimisebenzi yeselula. Kwangaxeshanye, i-NAD+ isebenza njengenxalenye ebalulekileyo ye-DNA yokulungisa i-enzymes kunye ne-activator ye-sirtuins, ngaloo ndlela igcina uzinzo lwe-genomic kwaye inegalelo kubomi obude. Ngaphantsi kweemeko zoxinzelelo lwe-oxidative kunye nokudumba, i-NAD + ithatha inxaxheba ekuboniseni iindlela kunye nommiselo we-calcium ukugcina i-homeostasis yeselula. Kwi-nervous system, i-NAD + ixhasa umsebenzi we-mitochondrial, inciphisa umonakalo we-oxidative, kwaye inceda ukulibazisa ukuqala kunye nokuqhubekela phambili kwezifo ze-neurodeergenerative. Kuba amanqanaba e-NAD+ ehla ngokwendalo ngenxa yobudala, izicwangciso zokugcina okanye zokuphucula i-NAD+ ziya ziqondwa njengezibalulekile ekukhuthazeni impilo kunye nokucotha ukuguga.