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Scientists discover pathway used by NMN to restore NAD+ levels | Alivebynature - All about NAD+
YES, NMN DOES CROSS THE CELL MEMBRANE INTACT Slc12a8 in the small intestine is important for transporting NMN from the gut into the circulation, affecting NAD+ levels in the small intestine and the systemic NMN supply in vivo. Remarkably, the function of the Slc12a8 NMN transporter becomes crucial in aged individuals compared with young ones. [...]