NAD+: The Coenzyme of Cellular Energy and Longevity

What NAD+ is

NAD+ stands for nicotinamide adenine dinucleotide, a coenzyme present in every living cell of the body. Its main function is as an electron carrier in oxidation-reduction (redox) reactions: NAD+ accepts electrons and becomes its reduced form, NADH, then releases them where metabolism needs them.

That continuous cycle between NAD+ and NADH is what lets the cell extract energy from nutrients. Without an adequate NAD+ level, the pathways that generate ATP — the cell's energy currency — lose efficiency. Beyond its redox role, NAD+ also acts as a consumable substrate for signaling enzymes, which places it at the crossroads between energy metabolism and the regulation of aging.

Decline with age

One of the most consistent findings in the biology of aging is that NAD+ levels fall markedly with age. Various studies in human and animal tissues describe reductions of up to ~50% by middle age compared with youth, with further declines at more advanced stages.

This drop is attributed to two combined factors: on one hand, lower synthesis and recycling of NAD+; on the other, greater consumption by enzymes that degrade it (notably CD38, which increases with age and inflammation). The result is a deficit that has been associated with mitochondrial dysfunction, reduced cellular repair capacity, and several hallmark features of aging. Restoring NAD+ is, for this reason, one of the most studied goals in longevity research.

Key functions

Energy and mitochondria

NAD+ is indispensable across the three major stages of energy production: glycolysis (breakdown of glucose in the cytoplasm), the Krebs cycle (inside the mitochondria), and oxidative phosphorylation (the electron transport chain that generates most of the ATP). In each of them the NAD+/NADH pair carries the electrons that keep the energy flow going. When NAD+ is scarce, mitochondrial function suffers.

DNA repair

NAD+ is the substrate of PARPs (poly-ADP-ribose polymerases), enzymes that detect and repair DNA damage. Every time PARPs are activated in response to a genetic lesion, they consume NAD+. Accumulated DNA damage can deplete NAD+ reserves, reducing the amount available for energy production and for sirtuins — a point of metabolic competition that is relevant in research.

Sirtuins

Sirtuins (SIRT1 through SIRT7) are a family of NAD+-dependent enzymes that regulate gene expression, metabolism, and the cellular stress response. They only work when NAD+ is available, so they are considered "sensors" of the cell's energy state. Their activity has been linked to central processes of aging: genomic stability, mitochondrial biogenesis, and metabolic regulation.

Consumption by CD38

CD38 is an enzyme that degrades NAD+ and whose activity increases with age and chronic inflammation. It is considered one of the main drivers of NAD+ decline in aged tissues, and is therefore a target of growing interest in research on how to preserve the coenzyme's reserves.

NAD+ vs precursors

The body does not usually absorb intact NAD+ easily by mouth, so much of the research has focused on its precursors: molecules the cell converts into NAD+ through the so-called salvage pathways.

• NMN (nicotinamide mononucleotide) — a direct precursor that is transformed into NAD+ in a single enzymatic step.
• NR (nicotinamide riboside) — a precursor that is first converted into NMN and then into NAD+.

The conceptual difference between administering direct NAD+ and administering precursors is one of the open debates in the field: direct NAD+ supplies the final molecule, whereas precursors depend on the cell's salvage pathways being active to synthesize it. Both approaches are studied in a research context, and the chosen route of administration strongly influences how the molecule reaches tissues.

Research routes

In research, direct NAD+ is usually explored via the intravenous (IV) and subcutaneous routes, since these avoid the digestive degradation of oral NAD+.

• IV — delivers the molecule directly into the bloodstream; associated with slow-infusion protocols in the models studied.
• Subcutaneous — administration in small volumes; practical for fractionated-dose schemes.

The half-life of circulating NAD+ is relatively short and its distribution to tissues is an active area of study. Considerations such as administration rate, concentration, and frequency are key variables in the design of any research protocol.

Reconstitution

Renova's NAD+ is supplied as lyophilized powder in a 1000 mg vial. It is reconstituted with bacteriostatic water at the concentration you define for your research.

Calculation example (1000 mg vial + 10 mL bacteriostatic water = 100 mg/mL): to prepare a 100 mg aliquot → 1.0 mL of reconstituted solution.

After reconstitution, refrigerate (2–8 °C) and protect from light. For custom calculations use the reconstitution calculator or see the complete reconstitution guide.

NAD+ at Renova

NAD+ is available as lyophilized powder:

• 1000 mg — $189

Our material is manufactured in a cGMP-compliant US lab that we work with directly, with a Certificate of Analysis (COA) by HPLC and mass spectrometry (MS).