So even if the majority of NR is broken down to NAM in intestines or liver, if some makes its way to bloodstream and even a little to muscle or other tissue, it can still be effective (Figure 6f).
I'm curious if there is anything we can do to increase the amount of NR that makes it out of the liver, such as combining with other substances.
Fig. 6f doesn't indicate anything about effectiveness, only that some NR made it to the liver without breakdown, even if virtually none of it made it to muscle cells. And what difference does it make if both NAM and NR are converted into NMN and then to NAD+? It all ends up in the same place, so rather than adding yet another supplement to get NR into cells without breakdown (if that were even possible), just supply N+R to begin with.
Sorry, I was a little sloppy in the reference placement. I meant:
So even if the majority of NR is broken down to NAM in intestines or liver (Figure 6f), if some makes its way to bloodstream(Figure 6g)and even a little to muscle or other tissue (Figure 6c,e), it can still be effective.
What I mean is, all the precursors raise NAD+ in the liver - some more, some less, but all a LOT more than the NAD+ increase in other tissue.
It seems that systemic and liver NAD+ has some benefit, but the muscle tissue drops to 15% without muscle nampt recycling.
So systemic NAD+ increase has some limits in its benefit to other tissues. Getting NAD+ to other tissues is more important.
Research says the different precursors increase NAD+ in various tissues differentially. My thought is that a little NR floating around MIGHT be more effective at increasing NAD+ in muscle. Or maybe not.
But if so, and you can do something to keep the liver from sucking out all the NR (converting to NAD+,NAM, NMR or whatever), and have a little more free-floating NR, it might get more to the other tissues where it is needed such as muscle.
Trammel & Brenner hypothesize that once NAD+ reaches a certain point, any remaining NR goes to NAAD, which looks reasonable imo, from the charts. Perhaps a similar "NAD limit" also allows some excess NR to remain and stay in bloodstream.
NAM also elevates NAD and NAAD. Perhaps NAM with, or before, NR will also reach that limit and allow more NR to "escape" the liver and float around the bloodstream to other tissue.
Or perhaps, NR + N + R.
Edited by able, 24 October 2017 - 07:38 PM.