NAD+: research protocol, dosing & reconstitution
Also known as: Nicotinamide adenine dinucleotide
Quick answer
What is NAD+?
NAD+ is a coenzyme every cell uses to turn food into energy, and its levels fall with age. It is not a peptide — it is a nucleotide — but it is sold and studied alongside them in longevity research. The strongest human evidence is for oral precursors, not injected NAD+.
What NAD+ is
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme, meaning a helper molecule that enzymes need in order to work. It shuttles electrons through the reactions that produce cellular energy, and it is also consumed by repair enzymes such as the sirtuins and PARPs. Levels decline measurably with age.
Worth stating plainly: NAD+ is not a peptide. It appears in this library because research vendors sell it beside peptides and researchers use it in the same protocols — not because it belongs to the same chemical class.
It is supplied as lyophilizedLyophilizedFreeze-dried. Peptides are shipped as a lyophilized powder ('puck') because the dry form is far more stable than a solution. It must be reconstituted before use in research.See glossary → powder for injection, or taken as oral precursors: nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN), which the body converts into NAD+.
Mechanism of action
Rather than being taken up whole, NAD+ is largely broken down and rebuilt from precursors, which is why most rigorous human work studies NR or NMN rather than NAD+ itself. A randomised, double-blind trial of long-term nicotinamide riboside reported that it raised NAD+ levels and was well tolerated in healthy adults [1].
Clinical outcomes are less settled than the biochemistry. A randomised placebo-controlled trial of nicotinamide riboside in older adults with mild cognitive impairment illustrates how the field is testing whether raising NAD+ translates into measurable benefit [2] — the honest position is that raising the level is established, while the downstream benefit is still being worked out.
What researchers study NAD+ for
- Cellular energy metabolism and mitochondrial function
- Sirtuin and DNA-repair pathway research
- Age-related NAD+ decline
- Cognitive and cardiometabolic outcome trials (via precursors)
What dose of NAD+ do researchers use?
Research literature commonly references doses of 50–100 mg subcutaneous (literature-referenced); IV protocols run far higher. This is not a recommendation — the table below summarizes protocols as they appear in published literature and trial designs.
| Context | Dose | Frequency | Duration |
|---|---|---|---|
| Subcutaneous research reference | 50–100 mg | Daily or several times weekly | Cycles referenced; no established schedule |
| Oral precursor (clinical trial reference) | NR 250–1,000 mg | Once daily | Weeks to months in trials |
← Swipe to see the full table
Half-life and dosing timing
Half-life: Short; NAD+ is rapidly metabolised. Route referenced in research: Subcutaneous, intravenous, or oral precursors (NR, NMN). NAD+ is metabolised rapidly, so injected protocols reference frequent dosing. Oral precursors are once daily and carry the better-characterised pharmacokinetics — one reason the trial literature favours them.
Titration: start low, go slow
Injected NAD+ is notably uncomfortable at higher doses and faster infusion rates, so protocols reference starting low and increasing slowly. With IV administration in particular, rate matters as much as dose.
Skip the NAD+ math
Enter vial size, water volume, and target dose — the free calculator returns concentration, injection volume, and exact U-100 syringe units.
How is NAD+ reconstituted?
| Vial size | BAC water | Concentration | Worked example |
|---|---|---|---|
| 100 mg | 1 mL | 100 mg/mL | 50 mg = 0.5 mL = 50 units on a U-100 syringe |
| 500 mg | 5 mL | 100 mg/mL | 100 mg = 1 mL = 100 units on a U-100 syringe |
Add 1 mL of bacteriostatic waterBAC water (bacteriostatic water)Sterile water containing 0.9% benzyl alcohol, which suppresses bacterial growth. It is the standard diluent used to reconstitute lyophilized peptides for multi-dose research vials.See glossary → to a 100 mg vialVialThe small sealed glass container peptides are supplied in, topped with a rubber septum that a syringe needle can pass through.See glossary →: 100 ÷ 1 = 100 mg/mL. A 50 mg dose is 50 ÷ 100 = 0.5 mL — 50 units on a U-100 syringeU-100 syringeAn insulin syringe calibrated so that 100 units equal 1 mL. The standard syringe referenced in peptide research; each unit equals 0.01 mL.See glossary →.
New to the process? Read the full step-by-step reconstitution guide.
How long does reconstituted NAD+ last?
Lyophilized: refrigerate and protect from light — NAD+ is comparatively unstable. ReconstitutedReconstitutionThe process of mixing a freeze-dried (lyophilized) peptide powder with bacteriostatic water to create a solution of known concentration.See glossary →: refrigerate at 2–8°C and use within weeks. Solutions may yellow with degradation.
What is NAD+ stacked with in research?
Referenced with SS-31 in mitochondrial protocols, the two acting at different points of the same energy system. Oral precursors are frequently used instead of injection precisely because the human evidence sits there.
Side effects observed in research
Flushing, nausea and injection-site pain are the common reports. With intravenous administration, infusing too quickly is associated with chest tightness and a marked flushing sensation — which is why IV protocols emphasise slow rates. Oral precursors were well tolerated in randomised trials.
- Flushing
- Nausea
- Injection-site pain
- Chest tightness if infused too quickly (IV)
Frequently asked questions
Is NAD+ a peptide?
No. It is a coenzyme — a dinucleotide, not a chain of amino acids. It is grouped with research peptides because vendors and researchers use it in the same context, not because it is chemically related.
Is injected NAD+ better than oral NR or NMN?
The human evidence points the other way. Randomised trials have studied oral precursors and shown they raise NAD+ levels; injectable NAD+ has far less controlled data behind it.
Why does NAD+ injection sting or cause flushing?
Both are commonly reported, and with IV administration they track with infusion rate — faster infusion produces more intense flushing and chest tightness, which is why slow rates are emphasised.
Does raising NAD+ slow aging?
Raising NAD+ levels with precursors is well established. Whether that produces meaningful clinical benefit is still under investigation — trials in cognition and vascular disease are ongoing and results so far are mixed.
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References
- 1.Conze D, et al. Safety and Metabolism of Long-term Administration of NIAGEN (Nicotinamide Riboside Chloride) in a Randomized, Double-Blind, Placebo-controlled Clinical Trial of Healthy Overweight Adults. Sci Rep. 2019. PubMed ↗
- 2.Orr ME, et al. A randomized placebo-controlled trial of nicotinamide riboside in older adults with mild cognitive impairment. Geroscience. 2024. PubMed ↗