Hi guys,
Most of the precursors of NAD are found in the good old tobacco plant. Including nmn. Now if we take nmn capsules it is plausible that most of it gets out of the body through urine without significant absorption.
I mean thus speaking a cigarette has all these derivatives all the way up to the actual nicotin which ACTUALLY should be very effective also because the absorption via smoke actually might produce a better pathway through the tissue into the cell.
Cride theory I know but let me know your 2cents