NAD+

NAD+ (Nicotinamide Adenine Dinucleotide) is a coenzyme: a helper molecule that assists enzymes in the chemical reactions cells use to process energy. It is built from two linked nucleotides and is studied in research contexts related to metabolism and aging. The injectable form referenced here is for laboratory and research use only.

Quick reference:

• Class: Coenzyme, not a standalone enzyme.
• Structure: Two nucleotides joined by a diphosphate bridge.
• Research category: Grouped with metabolism and aging research compounds.
• Status: Sold in injectable form for research and laboratory use only.

NAD+ (Nicotinamide Adenine Dinucleotide)

NAD+ reference materials in our catalog are supplied for laboratory and research use, and pair with standard reconstitution hardware rather than any compound-specific equipment.

Needle compatibility

Our reusable pens accept universal 28G–33G screw-on pen needles, so gauge selection is simply a workflow choice, not a hardware constraint.

Cartridge compatibility

Our pens are built for standard 3 ml glass cartridges with an 11 mm long plunger (stopper) — the cartridge we sell. Some 3 ml cartridges on the market instead use a shorter, roughly 8 mm plunger; because a pen is machined for one plunger height, that shorter format will not seat or function correctly in our pens. The glass looks identical from the outside, so if sourcing cartridges elsewhere, confirm the 11 mm long plunger before use. We have not tested our hardware against other manufacturers' pens, so fit outside our own catalog cannot be confirmed.

What it is

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme — a helper molecule that other enzymes depend on to carry out chemical reactions. Structurally, it is a dinucleotide: two nucleotide units joined by their phosphate groups. One nucleotide carries an adenine base, the other carries nicotinamide, a derivative of vitamin B3. This pairing places NAD+ in the broader family of pyridine nucleotides.

Functionally, NAD+ acts as an electron carrier. It shuttles between an oxidized form (NAD+) and a reduced form (NADH), picking up and releasing electrons and hydrogen atoms as it moves through cellular reactions — a role that has made it a frequent subject in cell-biology and aging research.

Key point: This overview describes NAD+ as a molecule, not as a product. PreppinPeppers does not sell NAD+ in any form; injectable forms referenced on this site have not been evaluated by the FDA and are not intended for human or veterinary use.

Research context and categorization

NAD+ is categorized in research as a coenzyme studied primarily in metabolism (how cells generate and use energy) and aging biology. It participates in several core cellular energy pathways and also serves as a starting material for enzymes tied to cell signaling and repair.

Where NAD+ fits in cell energy pathways

• Glycolysis - the first step in breaking down sugar for energy.
• Citric acid cycle - a loop of reactions that extracts additional energy from food.
• Oxidative phosphorylation - the main process that generates the cell's primary fuel.
• Fatty acid oxidation - the breakdown of fats for energy.

Beyond these pathways, NAD+ acts as a substrate for sirtuins and PARPs, two enzyme families studied for their roles in cell signaling and DNA repair.

Research categories NAD+ appears in

Studies have observed that intracellular NAD+ levels tend to decline with age, and in some conditions linked to aging. Because of this pattern, NAD+ is commonly grouped with research into cell energy production, cellular aging, neurological function, and muscle and exercise science. It is frequently studied alongside two related molecules, NR (nicotinamide riboside) and NMN (nicotinamide mononucleotide), which the body can convert into NAD+.

These remain areas of active investigation. The research categories 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 of NAD+ is for research use only. Some oral NAD+ precursors — NR (nicotinamide riboside) and, following a December 2025 FDA position, NMN (nicotinamide mononucleotide) — are sold as dietary supplements under DSHEA (Dietary Supplement Health and Education Act), a separate framework that does not require the same pre-market review as a drug. Injectable and IV NAD+ is generally handled as a compounded preparation, meaning it requires a licensed prescriber.
• Sport status: NAD+ and related molecules (NMN, NR, nicotinamide) are not named on the 2026 WADA Prohibited List, the global list of substances banned in competitive sport. That absence is not a clearance: WADA's strict-liability rule holds athletes responsible for any substance found in their body regardless of intent, and the broad S0 category covers non-approved substances generally. Athletes should verify current status through GlobalDRO or their national anti-doping authority before any laboratory use.

Reconstitution notes (general)

For lyophilized (freeze-dried) research powders, work out the concentration by dividing the milligrams of compound in the vial by the milliliters of diluent (bacteriostatic water) added. For example, 1000 mg reconstituted with 10 mL gives 100 mg/mL. To find the volume needed for a target concentration, use the calculator at peptide calculator.

Bacteriostatic water contains a small amount of benzyl alcohol as a preservative, which keeps bacteria from growing in solution over repeated draws. In the research literature, benzyl alcohol and other formulation factors can influence how stable a given compound remains once it is in solution, and stability varies by compound and storage conditions. For that reason, reconstituted vials are generally kept refrigerated and used within the timeframe noted in the compound's own documentation, rather than a single fixed rule for every substance.

Dilution and handling notes (compound-specific)

Vial Sizes and Concentration Ranges

NAD+ is usually supplied as a freeze-dried powder in larger vials than most research peptides — commonly 100 mg, 500 mg, or 1000 mg. Because the total mass per vial is higher, labs typically use more diluent per vial than they would for a typical peptide.

Frequently cited reconstitution ranges include:

• 100 mg vial: about 1 mL to 10 mL of bacteriostatic water, giving concentrations from roughly 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 because they make it easier to draw small, accurate volumes from the vial with a syringe.

Handling and Fragility

NAD+ dissolves readily in water and does not tend to gel or turn cloudy, so vigorous mixing is not needed. The main consideration is how chemically fragile the molecule is once in solution.

NAD+ is sensitive to pH — the 0-to-14 scale that measures how acidic or basic a solution is, with 7 as neutral. It is most stable in a roughly neutral range, near pH 6.5 to 7.5, and breaks down under strongly acidic or strongly basic conditions; reconstituted NAD+ solutions are themselves slightly acidic. NAD+ is also sensitive to light and does not tolerate repeated freeze-thaw cycles well. Think of it like a photograph left in sunlight: exposure to light or harsh conditions accelerates fading.

The diluent itself matters too. Bacteriostatic water contains a small amount of benzyl alcohol as a preservative, and benzyl alcohol concentration, along with pH and temperature, is one of several factors researchers cite as influencing how quickly a reconstituted peptide or cofactor solution degrades in storage. This is a documented variable in formulation literature, not a claim about the stability timeline of any specific product.

When adding diluent, pour it slowly down the inner wall of the vial and swirl gently rather than shaking. This limits foaming and protects a molecule that is sensitive to both pH and light.

Reconstituted solutions may carry a faint color. A light yellow or pink tint on its own is not necessarily a sign of breakdown. Cloudiness, floating particles, or a noticeably darker color are the warning signs worth noting.

Handling and storage

• Once reconstituted, refrigerate the vial at 2 to 8 degrees Celsius, away from direct light and away from the freezer.
• Wipe the stopper with an alcohol swab before every draw to reduce contamination risk, and label the vial with the reconstitution date so the storage window is easy to track at a glance.
• Reconstituted material is generally considered usable for roughly a four-week refrigerated window. NAD+ is more sensitive in solution than many reference peptides, so some sources recommend a shorter window - track the date closely and err on the conservative side.
• Inspect the vial before each use. Discard the contents if the solution turns cloudy or discolored, or if particles become visible - these are standard signs the material has degraded and should not be used further.

Frequently asked questions