Peter Attia· MD
the liver is basically to your point taking all of that NR and making nad correct yes so do we have a sense of how much nad actually makes its way into even the cytoplasm of a cell that is non hepatic in that situation nad that came from where that is derived ultimately from the NR that you ingested from the liver yes oh we know exactly what happens the liver turns that into nicotinamide and secretes it for the rest of the cells