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There must be some way to test for NAD+ because I see ads that say things like TRU NIAGEN is clinically proven to increase NAD+ by 60%, while NIH says NAD+ declines XX with age.

Then the NIH says our results demonstrate that 6 weeks of NR supplementation at this dose is well-tolerated in humans and effectively increases blood cellular NAD+ concentrations.

So it's possible this to be measured, however ...

It's likely the case that to test cellular levels of NAD+ is possible but not commonly available, which makes me wonder why take the "therapy" if you don't know if it is either effective or needed?

It's anti-aging, so does this affect the length of telomeres?

Just some general questions if anyone knows the answers.