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The risk may be increased if this product is used for an extended time, especially in newborns or in people with kidney disease

That distinction matters

From a GHK-Cu safety perspective, FDA drug approval requires comprehensive toxicological evaluations covering specific populations, long-term continuous exposure, and different administration routes

More recent studies have revealed a specific amino acid and polyamine transporter that's extremely selective for NMN and allows it to enter a cell without first becoming NR.7 Concentrations of this transporter in the guts of mice appear to increase with age, suggesting that the body tries to get extra NMN from its food supply to compensate for deteriorating levels of NAD+ that coincide with aging