What is NAD+ and why does it matter for longevity?

NAD+ (Nicotinamide Adenine Dinucleotide) is a coenzyme found in every living cell, essential for over 500 metabolic reactions. It

What is the difference between NMN and NR?

Both are NAD+ precursors but differ in conversion efficiency. NMN (Nicotinamide Mononucleotide) converts to NAD+ in one enzymatic step via NMNAT. NR (Nicotinamide Riboside) requires two steps—first converting to NMN, then to NAD+. NMN has stronger animal data; NR has more human clinical trials and FDA GRAS status. Both effectively raise NAD+ levels, and the debate about which is

How much NAD+ do we lose with age?

NAD+ levels decline approximately 50% between ages 40-60, with continued decline thereafter. This reduction is driven by increased activity of CD38 (an NAD+-consuming enzyme that rises with chronic inflammation), decreased synthesis from precursors, and increased demand from DNA repair (PARP) as genomic damage accumulates. The decline correlates with mitochondrial dysfunction, reduced sirtuin activity, and impaired DNA repair.

Can I combine NAD+ with longevity peptides?

Yes, NAD+ precursors are commonly combined with longevity peptides for synergistic effects. Common stacks include: NAD+ + MOTS-c (metabolic optimization), NAD+ + SS-31 (mitochondrial support), NAD+ + Epitalon (cellular renewal), and comprehensive protocols using all four. The rationale is that each targets different hallmarks of aging, creating a more comprehensive intervention than any single compound.

What is the recommended NAD+ dosage?

Dosing depends on the form: NMN 250-1000mg daily (oral/sublingual), NR 300-600mg daily (oral capsule), IV NAD+ 250-750mg per session (clinical setting, typically weekly or biweekly). Most longevity researchers take 500mg NMN or 300mg NR daily. Some protocols include

Are there side effects of NAD+ supplementation?

Oral NAD+ precursors (NMN, NR) are generally well-tolerated with mild side effects including flushing, nausea, and headache at higher doses. IV NAD+ can cause more pronounced flushing, chest tightness, and nausea during infusion. There

PeptideKey Research Library

NAD+ Peptides: Clinical Data on Cellular Energy [2026]

NAD+ peptides promise cellular rejuvenation — but what does the research actually show? MOTS-c, SS-31, and humanin mechanisms explained with cited evidence.

This research guide is part of PeptideKey's evidence-based peptide research library covering 100+ compounds with lab-verified purity data.