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2018 Nature Communications paper (NR reduced blood pressure and arterial stiffness in healthy middle-aged adults), and numerous pharmacokinetic studies Animal lifespan data: While NAD+ precursors have shown healthspan improvements in mice (improved physical activity, insulin sensitivity, mitochondrial function), clear lifespan extension data is more limited and inconsistent DNA repair: Studies demonstrated restored PARP-dependent DNA repair in aged mice and radiation-exposed human cells following NAD+ repletion Stem cell rejuvenation: NMN restored aged muscle stem cell function and improved hematopoietic stem cell parameters in mice Epidemiological data: NAD+ levels correlate with biological age across multiple cohort studies, establishing translational relevance Key limitations: Despite abundant evidence for NAD+ restoration, the downstream clinical benefits in humans are still being established

Additionally, efforts to enhance intrinsic neuronal protective mechanisms, through upregulation of neurotrophic factors, restoration of calcium homeostasis, or stabilization of synaptic plasticity, offer further promise [29, 30]

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After decapitation, the RL4,5,6-DRG and L5-SC were extracted and fixed in 4% paraformaldehyde in 0.1 M phosphate buffer (pH 7.4)