Published March 2026 | Valen Research | For Educational and Informational Purposes Only

What Is NAD+?

Nicotinamide adenine dinucleotide — known as NAD+ — is a coenzyme found in every living cell. It plays a central role in a wide range of biological processes that researchers have studied extensively over the past two decades, including energy metabolism, mitochondrial function, DNA repair mechanisms, and cellular signaling pathways.

NAD+ exists in two forms — its oxidized state (NAD+) and its reduced state (NADH) — and the balance between these two forms is considered critical to maintaining cellular function across multiple biological systems.

What Does the Research Show About NAD+ and Aging?

One of the most consistent findings across the scientific literature is that intracellular NAD+ concentrations appear to decline progressively with age. Research has documented that intracellular NAD+ levels decline with age across multiple tissues and organ systems, and that restoring NAD+ content has been shown to reinstate cellular and physiological function in various model systems. Sciexplor

Studies in model organisms and human tissue samples have documented roughly a 50% reduction in NAD+ levels by middle age, with further decline continuing into later life. Spartan Peptides This decline has drawn significant scientific interest as researchers investigate what role NAD+ metabolism plays in age-related biological changes.

NAD+ and Mitochondrial Research

A significant area of NAD+ investigation centers on its relationship with mitochondrial function. NAD+ is a coenzyme involved in a wide range of physiological reactions, with key relevance in supporting mitochondrial function. Declining levels of NAD+ have been associated in research with general aging and chronic disorders, including cognitive decline, sarcopenia, and metabolic diseases — conditions also characterized by loss of mitochondrial health. PubMed Central

Researchers have explored various strategies for studying how NAD+ levels interact with mitochondrial processes, with particular interest in compounds known as NAD+ precursors — molecules the body may use in the synthesis of NAD+.

Recent Research Highlights — March 2026

A review published this week in Nature Aging, drawing on contributions from researchers at the University of Oslo, Harvard Medical School, and the Buck Institute for Research on Aging among others, examined years of laboratory and clinical research on strategies to study NAD+ levels. Early findings from some trials have reported observations related to memory, physical movement, and metabolic health, though the researchers stress that larger and longer studies in patients are needed to confirm how effective these approaches are across different diseases. ScienceDaily

The publication reflects a broader moment of growing scientific interest in NAD+ biology. Clinical trials are currently underway worldwide to test NAD+ precursors, while these compounds have also entered a rapidly expanding research market. ScienceDaily

NAD+ and Muscle Research

One area of particular interest in the scientific community is the relationship between NAD+ and skeletal muscle. A decline in cellular NAD+ levels has been associated in research with reduced mitochondrial oxidative capacity in patients with sarcopenia. Skeletal muscle NAD+ abundance has been found to be reduced in physically impaired but otherwise healthy older adults, while exercise-trained older subjects exhibit NAD+ levels similar to those of younger individuals. Sciexplor

These findings have led researchers to investigate whether NAD+ metabolism plays a role in the relationship between physical activity and cellular aging processes.

NAD+ and the Gut Microbiome

A 2026 study published in Nature Metabolism examined how different NAD+ precursors interact with gut microbiome activity. The research, which involved 65 healthy adults, found that certain NAD+ precursors offer sustained increases in NAD+ and promote gut health by enhancing microbial activity and short-chain fatty acid production — suggesting potential dual benefits on both systemic NAD+ levels and gut health. NutraIngredients.com

Important Research Context

All information presented in this post is drawn from published scientific literature and is intended for educational purposes only. NAD+ research compounds available through Valen Research are sold strictly for in vitro laboratory and research use only. They are not intended for human consumption, are not FDA-approved, and are not intended to diagnose, treat, cure, or prevent any disease or medical condition.

Researchers interested in studying NAD+ biology should consult the primary literature referenced throughout this post and ensure full compliance with all applicable institutional and regulatory requirements governing research use of compounds in their jurisdiction.

References

Geromedicine Clinical Review. 2025. DOI: 10.70401/Geromedicine.2025.0008

Zhang et al. Nature Aging, 2025. DOI: 10.1038/s43587-025-00947-6

Christen et al. Nature Metabolism, 2026. Volume 8, Pages 62–73

Yusri et al. npj Metabolic Health and Disease, 2025. DOI: 10.1038/s44324-025-00067-0