Their relevance to humans is not fully known
As we age, our NAD+ levels will naturally decrease, which leads to unfavorable changes in our cognitive health, skin elasticity, muscle composition, vascular health, nerve health, energy levels, and metabolism (to name a few!) NAD+ may not completely reverse these things, but boosting your levels will result in improvement of these age-related concerns.
GHK-Cu affecting gene expression broadly impacts RPE function through multiple pathways simultaneously
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NAD+ precursors : Inhibits degradation for sustained effects
Inhibiting NNMT with 5-Amino-1MQ could help preserve NAD+ levels, possibly slowing age-related metabolic deterioration and supporting defenses against age-related diseases [3]