There are some studies about a possible link with NAD and cancer and it is not recommended if you diagnosed with one

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Chim 308:5557 Roy L, Pan N, Mondal S, Ghosh R, Hasan MN, Bhattacharyya N, Singh S, Bhattacharyya K, Chattopadhyay A, Pal SK (2024) Ultrafast spectroscopic studies on the interaction of reactive oxygen species with a probe impregnated in nanoscopic and microscopic matrix formulation
Both are hexapeptide ghrelin-receptor agonists