NAD+ (Nicotinamide Adenine Dinucleotide): Reference Overview and Reconstitution Notes

NAD+ (Nicotinamide Adenine Dinucleotide)

What it is

NAD+ is a coenzyme built from two nucleotides joined through their phosphate groups, one carrying an adenine base and the other carrying a nicotinamide (vitamin B3 derived) base. It belongs to the pyridine-nucleotide family and acts as an electron and hydrogen carrier in the oxidation-reduction reactions that underpin cellular energy metabolism.

Research context and categorization

NAD+ is generally grouped under metabolic and anti-aging or longevity research compounds. As a coenzyme it participates in glycolysis, the citric acid cycle, oxidative phosphorylation, and fatty acid oxidation, and it also serves as a substrate for enzymes such as sirtuins and PARPs that are involved in signaling and repair pathways.

In the research literature it is commonly discussed in relation to the observation that cellular NAD+ levels tend to decline with chronological age and in several age-associated conditions. On that basis it is studied in the context of mitochondrial and energy metabolism, cellular aging, neurological and cognitive pathways, and exercise or muscle physiology, often alongside its precursors nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN). These are areas of active investigation. The uses described here are investigational and have not been confirmed or approved as benefits, and injectable NAD+ has not been established by regulators as safe or effective for any of them.

Status

  • Regulatory status: Research-only for the injectable or lyophilized form, which is not FDA-approved as a drug for any indication. Certain oral NAD+ precursors (such as nicotinamide riboside, and, following a December 2025 FDA position, nicotinamide mononucleotide) are marketed as dietary supplements under DSHEA, a separate framework that does not involve pre-market drug approval. Injectable and IV NAD+ is generally handled as a compounded preparation requiring a licensed prescriber rather than an approved drug product.
  • Sport status: Not specifically listed on the WADA Prohibited List. NAD+ and its precursors (NMN, NR, nicotinamide) are not named on the 2026 WADA Prohibited List. Athletes should still note the strict-liability principle and WADA's broad S0 non-approved-substances category, and should verify current status through GlobalDRO or their anti-doping authority before use.

Reconstitution notes (general)

For lyophilized (freeze-dried) research powders, the working concentration is calculated as the milligrams of compound in the vial divided by the millilitres of bacteriostatic water added. For example, 1000 mg reconstituted with 10 mL of bacteriostatic water yields a concentration of 100 mg/mL. To work out a specific volume for a target concentration, use the reconstitution calculator at /pages/tools.

Dilution and handling notes (compound-specific)

NAD+ is typically supplied as a lyophilized powder in relatively large vials (commonly 100 mg, 500 mg, or 1000 mg), reflecting the fact that it is worked with at higher masses than most short peptides. Because of this, laboratories often use larger water volumes per vial than they would for a peptide. Frequently cited ranges span roughly 1 mL to 10 mL of bacteriostatic water for a 100 mg vial (giving anywhere from 100 mg/mL down to 10 mg/mL), about 3 mL for a 500 mg vial (roughly 166.7 mg/mL), and about 10 mL for a 1000 mg vial (100 mg/mL). Lower concentrations are sometimes chosen simply to make small measured amounts easier to draw.

NAD+ is highly water-soluble and generally dissolves readily rather than gelling or clouding, so vigorous mixing is not required. The main compound-specific quirk is chemical fragility rather than dissolving difficulty. NAD+ is sensitive to pH and is most stable in a roughly neutral window (near pH 6.5 to 7.5), degrading under strongly acidic or strongly alkaline conditions, and its solutions are themselves mildly acidic. It is also light-sensitive and does not tolerate repeated freeze-thaw cycles. Adding the diluent slowly down the inner vial wall and swirling gently rather than shaking reduces foaming and mechanical stress on a pH- and light-sensitive molecule. Reconstituted solutions are often faintly tinted; a light yellow or pink cast on its own is not necessarily a sign of degradation, whereas cloudiness, floating particles, or darkening are.

Handling and storage

Store the reconstituted solution refrigerated at 2 to 8 degrees Celsius and keep it out of light. Wipe the vial stopper with an alcohol swab before each access, and label the vial with the date of mixing. Reconstituted material is generally treated as usable for roughly a four-week refrigerated window, and some references suggest a shorter window for NAD+ given its solution sensitivity. Discard the vial if the contents become cloudy or discolored or show floating particles.

Related reading

Tools and supplies

For laboratory and research reference only. Educational content, not medical, dosing, injection, or therapeutic guidance, and not intended for human or animal use. Any research uses described are investigational and not confirmed or approved benefits. Confirm anything involving health with a licensed professional. References linked above.