NAD + ni coenzyme yingenzi mubuzima bwimikorere ya selile, igira uruhare runini muburyo bwo guhinduranya ingufu, gusana ADN no kurwanya gusaza, guhagarika umutima no kugenzura ibimenyetso, ndetse na neuroprotection. Mu mbaraga za metabolisme, NAD + ikora nk'ingenzi itwara electron muri glycolysis, cycle ya tricarboxylic, na fosifori ya mitochondrial oxyde, itwara synthesis ya ATP no gutanga ingufu mubikorwa bya selile. Muri icyo gihe, NAD + ikora nk'ibikoresho byingenzi byo gusana ADN imisemburo no gukora sirtuins, bityo bikagumya gutuza no kugira uruhare mu kuramba. Mugihe ibintu bya okiside itera no gutwika, NAD + igira uruhare mukumenyesha inzira no kugenzura calcium kugirango ibungabunge homeostasis. Muri sisitemu y'imitsi, NAD + ishyigikira imikorere ya mitochondial, igabanya kwangirika kwa okiside, kandi ifasha gutinda gutangira no gutera imbere kwindwara zifata ubwonko. Kubera ko urwego rwa NAD + rusanzwe rugabanuka uko imyaka igenda ishira, ingamba zo kubungabunga cyangwa kuzamura NAD + ziragenda zimenyekana nkingirakamaro mu guteza imbere ubuzima no gutinda gusaza.