Scientific White Paper: Nicotinamide Riboside and NAD+ Metabolism

Scientific White Paper

Evidence-Based Scientific Review

This scientific white paper provides an evidence-based overview of NAD+ metabolism, the biological role of nicotinamide adenine dinucleotide (NAD+), and the mechanisms through which nicotinamide riboside (NR) contributes to NAD+ biosynthesis.

The paper reviews:
• NAD+ biology and cellular metabolism
• Mechanisms contributing to age-associated NAD+ decline
• The nicotinamide riboside salvage pathway
• Human clinical evidence related to NR supplementation
• Translational relevance of NAD+ metabolism for healthy aging

Author: Rob Brown, M.S.
Organization: Adenyx Health LLC
Publication Date: March 2026

Download the full white paper.

Abstract

Nicotinamide adenine dinucleotide (NAD+) is a ubiquitous central metabolic cofactor involved in numerous cellular reactions, including energy metabolism, DNA repair, and cellular stress responses. In addition to its classical role in redox biology, NAD+ also functions as a substrate for signaling enzymes such as sirtuins, poly(ADP-ribose) polymerases (PARPs), and CD38. Through these pathways, NAD+ participates in the regulation of mitochondrial function, genomic stability, and metabolic adaptation.

Cellular NAD+ levels have been shown to decline with age and in several metabolic and neurodegenerative conditions, contributing to growing interest in nutritional strategies that support NAD+ metabolism. Among these approaches, nicotinamide riboside has emerged as a well-studied NAD+ precursor with demonstrated oral bioavailability and increasing clinical research interest.

Disclaimer

This document is intended for educational and scientific discussion purposes only. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease.