NAD+ and cellular energy research

Why the cellular coenzyme NAD+ sits at the center of longevity research — sirtuins, PARPs, and the age-related decline question.

NAD+ has become one of the most discussed molecules in longevity research — not because it is new, but because researchers keep finding new places it shows up.

What NAD+ does

NAD+ is a coenzyme that shuttles electrons in cellular respiration. It is also a required substrate for two enzyme families implicated in aging: sirtuins (involved in metabolic and stress regulation) and PARPs (involved in DNA repair).

The age-related decline

Multiple studies show NAD+ pool sizes drop with age across tissues. Restoring those pools is the central premise of the entire NAD+ supplementation research agenda.

Editorial overview only. All peptide products referenced are intended solely for research, investigational, or licensed professional use. Conduct your own research and consult a trusted, licensed medical practitioner before any personal or clinical use.

Peptides referenced in this article

Peptide	Category	Summary
NAD+	Longevity & Cellular	NAD+ is a coenzyme central to cellular energy production, DNA repair, and sirtuin signaling. Endogenous NAD+ declines with age, making it a focal point of longevity and metabolic research.
Glutathione	Longevity & Cellular	Glutathione is a tripeptide (glutamate-cysteine-glycine) and the principal endogenous antioxidant inside cells. It is central to oxidative-stress, detoxification, and immune-related research.

Read next

• NAD+ reference page: Foundational cellular coenzyme studied for energy metabolism and longevity. — /peptides/nad-plus
• Glutathione reference page: The body's master intracellular antioxidant — extensively studied for cellular defense. — /peptides/glutathione

Further reading

• Peptide Guide 2026 — protocols, dosing, cycles and reconstitution across every category: /education
• Peptide library — mechanism, applications and half-life for each compound we carry: /peptides
• Reconstitution calculator — concentration, mL per dose and U-100 syringe units: /tools/reconstitution-calculator
• Editorial standards — how this content is sourced, reviewed and corrected: /editorial-standards

About this article

Published 2026-06-13 by the Clarity Wellness editorial team. Approximate reading time: 6 minutes. Our sourcing and review policy is published at /editorial-standards.

Important

All peptide products referenced are intended solely for research, investigational, or licensed professional use. They are not FDA-approved and are not intended to diagnose, treat, cure, or prevent any disease. Consult a licensed medical practitioner before any personal or clinical use.