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

NAD+ is a coenzyme (a helper molecule that works alongside enzymes to power chemical reactions inside cells). It is grouped with compounds studied for metabolism and aging research. Its injectable form is for research use only and is not FDA-approved as a drug.

NAD+ (Nicotinamide Adenine Dinucleotide)

What it is

NAD+ is a coenzyme, meaning it is a helper molecule that enzymes need in order to do their job. Think of it like a rechargeable battery inside the cell. It picks up tiny packets of energy (electrons and hydrogen atoms) in one part of the cell and delivers them to another, helping power the cell's energy-making processes.

NAD+ is built from two smaller units called nucleotides, joined together through phosphate groups (the chemical "connectors" that link them). One unit carries a part called adenine, and the other carries nicotinamide (which comes from vitamin B3). NAD+ belongs to a family of molecules called pyridine nucleotides.

Key point: NAD+ is widely studied for its role in cell energy production and aging. However, its injectable form is for research use only. It has not been established as safe or effective by regulators.

Research context and categorization

NAD+ is grouped with compounds studied for metabolism (how cells make and use energy) and aging research. As a coenzyme, it takes part in several key energy-making steps inside the cell. These include glycolysis (the first step in breaking down sugar for energy), the citric acid cycle (a loop of reactions that extracts more energy from food), oxidative phosphorylation (the main process that generates the cell's primary fuel), and fatty acid oxidation (breaking down fats for energy). NAD+ also acts as a starting material for enzymes called sirtuins and PARPs, which are involved in cell signaling and repair.

Research has observed that NAD+ levels inside cells tend to drop as organisms get older, and also in some conditions linked to aging. Because of this, scientists study NAD+ in areas like cell energy production, how cells age, brain and nerve function, and muscle and exercise science. It is often studied alongside related molecules called NR (nicotinamide riboside) and NMN (nicotinamide mononucleotide), which the body can use to make NAD+.

These are areas of active investigation. The uses described here are investigational and have not been confirmed or approved as benefits. Injectable NAD+ has not been established by regulators as safe or effective for any of these uses.

Status

• Regulatory status: The injectable or freeze-dried form is for research only and is not FDA-approved as a drug for any use. Some oral NAD+ building blocks, such as NR (nicotinamide riboside) and, following a December 2025 FDA position, NMN (nicotinamide mononucleotide), are sold as dietary supplements under a separate set of rules called DSHEA. DSHEA does not require the same pre-market approval as a drug. Injectable and IV NAD+ is generally handled as a compounded preparation, meaning it requires a licensed prescriber and is not an approved drug product.
• Sport status: NAD+ is not specifically listed on the WADA Prohibited List (the global list of substances banned in competitive sport). NAD+ and its related molecules (NMN, NR, nicotinamide) are not named on the 2026 WADA Prohibited List. Athletes should still be aware of WADA's strict-liability rule (athletes are responsible for any substance found in their body, regardless of intent) and the broad S0 category, which covers non-approved substances. Athletes should verify current status through GlobalDRO or their anti-doping authority before laboratory use.

Reconstitution notes (general)

For lyophilized (freeze-dried) research powders, you calculate the working concentration by dividing the milligrams of compound in the vial by the milliliters of bacteriostatic water (water with a small amount of preservative that keeps bacteria from growing) you add.

For example, 1000 mg reconstituted with 10 mL of bacteriostatic water gives a concentration of 100 mg/mL. To work out the volume needed for a specific target concentration, use the reconstitution calculator at peptide calculator.

Dilution and handling notes (compound-specific)

Vial Sizes and Concentration Ranges

NAD+ is usually supplied as a freeze-dried powder in larger vials (commonly 100 mg, 500 mg, or 1000 mg). These are larger amounts than most research peptides. Because of this, labs typically use more water per vial than they would for a typical peptide.

Frequently cited dilution ranges include:

• 100 mg vial: About 1 mL to 10 mL of bacteriostatic water (giving concentrations anywhere from 100 mg/mL down to 10 mg/mL).
• 500 mg vial: About 3 mL of bacteriostatic water (roughly 166.7 mg/mL).
• 1000 mg vial: About 10 mL of bacteriostatic water (100 mg/mL).

Lower concentrations are sometimes chosen to make it easier to draw small, accurate amounts from the vial.

Handling and Fragility

NAD+ dissolves easily in water and does not tend to form a gel or turn cloudy, so vigorous mixing is not needed. The main thing to watch for is how chemically fragile it is.

NAD+ is sensitive to pH (the scale from 0 to 14 that measures how acidic or basic a solution is, with 7 being neutral). It is most stable in a roughly neutral range (near pH 6.5 to 7.5). It breaks down under strongly acidic or strongly basic conditions, and its solutions are themselves slightly acidic. NAD+ is also sensitive to light and does not hold up well if frozen and thawed repeatedly. Think of it like a photograph: just as a photo fades when left in sunlight, NAD+ degrades when exposed to light or harsh conditions.

When adding the diluent, add it slowly along the inner wall of the vial and swirl gently instead of shaking. This reduces foaming and protects a molecule that is sensitive to both pH and light.

Reconstituted solutions may have a faint color. A light yellow or pink tint on its own is not necessarily a sign of breakdown. However, cloudiness, floating particles, or a noticeably darker color are warning signs.

Handling and storage

• Store the reconstituted solution in the refrigerator at 2 to 8 degrees Celsius and keep it away from 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 considered usable for about a four-week refrigerated window. Some references suggest a shorter window for NAD+ because it is more sensitive in solution.
• Discard the vial if the contents become cloudy, discolored, or show floating particles.

Related reading

• Ovagen
• P21
• Pancragen
• How Reconstitution Works
• How Long Does a Reconstituted Vial Last?

Tools and supplies

• peptide calculator
• Bacteriostatic Water 30 ml
• Gansulin Metal Reusable Pen
• 3 ml Glass Cartridges (10-pack)
• Complete Starter Kit

Reminder: research and educational reference only. Preppin Peppers sells hardware and materials, not peptides. Not medical, dosing, or health advice, not evaluated by the FDA, and not intended for human or animal use.

Frequently asked questions

What is NAD+ and what does it do inside cells?

NAD+ is a coenzyme that shuttles electrons through glycolysis, the citric acid cycle, and oxidative phosphorylation, and acts as a substrate for sirtuins and PARPs involved in cell signaling and DNA repair.

Is injectable NAD+ FDA-approved, and how does it differ from NR or NMN supplements?

Injectable/freeze-dried NAD+ is not FDA-approved and requires a licensed prescriber as a compounded preparation. Oral precursors NR and NMN are sold as dietary supplements under DSHEA, a separate regulatory framework that does not require pre-market drug approval.

Is NAD+ prohibited in competitive sport under WADA rules?

NAD+ and related molecules (NMN, NR, nicotinamide) are not listed on the 2026 WADA Prohibited List. Athletes should still apply WADA's strict-liability rule, under which they bear responsibility for any substance detected in their system.

What the research community gets wrong about NAD+

• NAD+ and NADH are not interchangeable on the bench. NAD+ is the oxidized form and NADH is the reduced form. They even respond to pH in opposite ways. Bench work has reported that NAD+ holds up better in slightly acidic to neutral solution, while the reduced form holds up better under alkaline conditions. Applying a spec sheet or storage note written for one form to the other is a common mix-up.
• NR and NMN are precursors, not NAD+. Nicotinamide riboside and nicotinamide mononucleotide are separate compounds that cells can convert toward NAD+. They are sold under a different set of rules. A vial labeled "NAD+" that is actually a precursor is a real sourcing error to check against the certificate of analysis.
• "NAD+ declines with age" describes measured samples, not your vial. That observation comes from levels measured in cells and tissues of model organisms in the literature. It is not a statement about what a reconstituted powder in front of you does for anyone.
• Color is a weak proxy for purity. A faint yellow or pink tint on its own is not proof of breakdown, but "it looks fine" is not a purity check either. Only an assay, such as UV absorbance, tells you what fraction of the coenzyme is still intact.
• Buffer choice is not neutral by default. Reaching for phosphate buffer out of habit can work against you. Bench studies have reported that phosphate can speed breakdown of the coenzyme by forming adducts with the pyridine ring, so the diluent and buffer you pick actually change the stability you observe.

From our bench: If you reconstitute a NAD+ vial, we want your real readings. Measure the solution pH right after mixing and again at day 7 and day 14 under refrigeration, note the temperature your fridge actually holds, and record any color shift against a white background. Send us your numbers and photos and we will add anonymized bench observations to this page. We will not publish invented values, only what someone actually measured.

Sources

1. Bacteriostatic Water for Injection, USP , FDA/DailyMed label (0.9% benzyl alcohol)
2. Duerkop et al., Biotechnol J 2018 , Impact of Cavitation, High Shear Stress and Air/Liquid Interfaces on Protein Aggregation
3. Sigma-Aldrich (Merck) , Handling and Storage Guidelines for Peptides and Proteins
4. PubChem CID 5892: Nadide (NAD+), C21H27N7O14P2 , U.S. National Library of Medicine
5. Covarrubias AJ, Perrone R, Grozio A, Verdin E. NAD+ metabolism and its roles in cellular processes during ageing. Nat Rev Mol Cell Biol. 2021;22(2):119-141 (PMID 33353981)
6. Rover Júnior L, et al. Study of NADH stability using ultraviolet-visible spectrophotometric analysis and factorial design. Anal Biochem. 1998 (PMID 9648652)