# Why NAD+ Boosters Like NR May Be a Double-Edged Sword for Muscle

*Sarcopenia and satellite cell homeostasis disruption: the dual function of NAD+ metabolism.*

- **Evidence Level**: Preliminary
- **Publication Types**: Journal Article, Review
- **Journal**: Frontiers in nutrition
- **Sample Size**: N/A
- **Authors**: Li C, Ai Y, Yan J, Wu S
- **Published**: 2026-06-05
- **Topics**: NAD+, sarcopenia, muscle
- **DOI**: https://doi.org/10.3389/fnut.2026.1803560
- **Original Source**: https://pubmed.ncbi.nlm.nih.gov/42325507/

## Summary

Many people take NMN or NR hoping to fight age-related muscle loss. This review of about 60 studies says the story is more complicated. Moderate NAD+ boosting helped muscle stem cells repair and grow in lab and animal studies. But too much or poorly timed signaling actually exhausted those stem cells. Dose and context seem to matter a lot.

## Practical Takeaway

This review suggests NAD+ precursors like NR may help muscle stem cells, but the effect depends heavily on dose.

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_Canonical: https://longevity-germany.com/en/research/why-nad-boosters-like-nr-may-be-a-double-edged-sword-for-muscle · Part of Longevity Cities · Updated 2026-06-05_