NAD+ levels in humans: blood versus tissue, aging, exercise and NMN/NR
The video description says human NAD+ findings are more complicated than a simple aging story: blood and tissue measurements can differ, and a blood NAD+ result is not a whole-body health score. [1]
Automatic summary · not editorially reviewed
The key findings
The description says blood and tissue NAD+ measurements can differ and a blood NAD+ result is not a whole-body health score. [1]
The description names a human whole-blood study reporting NAD+ levels do not vary with age or lifestyle interventions. [1]
The description lists human NMN trials, including a randomized, double-blind, placebo-controlled trial in healthy middle-aged adults. [1]
The source at a glance
- Study type / format
- Video description summarizing human studies
- Population / context
- People discussed in the cited human studies, including healthy middle-aged and older adults and skeletal-muscle study participants.
- Summary based on
- Creator description
- Original publication
- August 25, 2026
Blood versus tissue NAD+ and what a level means
According to the description, the video asks what an NAD+ level actually means and why blood and tissue measurements can differ. It also says a blood NAD+ result is not the same thing as a whole-body health score. The description names a human whole-blood study reporting that NAD+ levels do not vary with age or lifestyle interventions, and a study reporting that healthy aging and muscle function are positively associated with NAD+ abundance in humans. These are described as associations, not causes.
Supporting source [1]
Exercise training and raising NAD+ with NMN or NR
The description lists a human skeletal-muscle study in which aerobic and resistance exercise training reversed an age-dependent decline in NAD+ salvage capacity. It also names human trials of NMN: a randomized, multicenter, double-blind, placebo-controlled trial in healthy middle-aged adults, and a study in older adults reporting higher blood NAD levels, maintained walking speed and improved sleep quality after NMN ingestion. A further study compared three different NAD+ boosters and their effects on circulatory NAD and microbial metabolism. The description does not state the size, duration or effect sizes of these studies.
Supporting source [1]
Testing NAD+ and the limits of this description
The description says the video covers whether you should test your NAD+ and what to take from the evidence. It discloses that CELLSHE sells NMN supplements and states the video is general education, not medical advice. Supplements are not intended to diagnose, treat, cure or prevent disease. This explainer relies only on the description: the video and transcript were not reviewed, so study details, results and caveats beyond the listed titles and topics are unknown.
Supporting source [1]
How to interpret this
Only the video description was reviewed; the video and transcript were not reviewed. Study sizes, durations, effect sizes and caveats are not given in the description. The creator sells NMN supplements.
Based on the creator’s description; the full video and transcript were not analyzed.
Source & supporting passages
CELLSHE — Longevity for Women · youtube.com · August 25, 2026