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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

Some researchers prefer saline for subcutaneous or intraperitoneal routes in rodent studies