Peptide guide

NAD+

Nicotinamide adenine dinucleotide — a cellular coenzyme, not a peptide, studied for energy metabolism and aging.

NAD+ is a coenzyme your cells already make and burn through millions of times a second to run energy metabolism and DNA repair. Levels fall with age, which is the whole reason injectable NAD+ became a longevity trend. The mechanism is well understood; the human evidence that topping it up slows aging is thin, and for the injected form specifically it's close to absent. It isn't FDA-approved as an anti-aging drug, pushing a subcutaneous dose up too fast brings on flushing and chest pressure, and as with any injectable from this market, the real question is whether the vial holds what the label claims.

By the Zapify Research team

Reviewed against 12 clinical & research sources · Updated June 2026 · Educational use only

Type: Coenzymenot a peptide
Route: Subcutaneous
Typical dose: ~50–100 mg SubQa few times/week
Cycle: Titrate up slowlya few times/week
Storage: Mixed: ~2 wksSealed: frozen
Status: Not FDA-approved

What is NAD+?

A coenzyme your cells make from vitamin B3 to run energy metabolism and DNA repair — not a peptide, and not FDA-approved as a drug.

NAD+ is nicotinamide adenine dinucleotide, a coenzyme your body already makes from vitamin B3. It isn't a peptide, so there's no amino-acid sequence behind the name. It's a small molecule built from two linked nucleotides, and nearly every cell you have depends on it. It carries electrons through the reactions that turn food into usable energy, and it's the fuel that two repair-and-signaling enzyme families, the sirtuins and the PARPs, spend to do their jobs.

The reason anyone injects it traces back to one observation: cellular NAD+ falls as you age. Measurements in human tissue suggest a drop of roughly 40 to 50 percent between your forties and your sixties, and that decline tracks alongside the mitochondrial slowdown and weaker DNA repair that come with getting older. The idea behind injectable NAD+ is to push those levels back up directly, rather than waiting on the body's own recycling.

What Zapify supplies is the coenzyme itself as a lyophilized powder you reconstitute and inject under the skin, the same draw the calculator on this page is built around. Clinics also run it intravenously, and a nasal-spray form exists. Oral capsules exist too, but most of the NAD+ molecule is broken down in the gut before it's absorbed, which is why precursors like NMN and NR are the more common pill route and why people who want the molecule itself reach for the subcutaneous injection.

NAD+ is not FDA-approved as a drug for anti-aging or any other use. Injectable NAD+ is prepared by compounding pharmacies under section 503A and dispensed by prescription; its safety and efficacy for that formulation haven't been evaluated by the FDA. Oral NAD+ and its precursors are sold as dietary supplements, a category the FDA does not review for effectiveness before sale. Treat it as an experimental wellness compound, not a proven medicine.

What is it studied for?

The biochemistry is settled and animal data extensive, but a 2026 review found no controlled outcome trials of injectable NAD+ in people.

The biochemistry of NAD+ is some of the best-characterized in cell biology, and the animal work on raising it is extensive: a 2026 systematic review of NAD+ for anti-aging gathered 113 studies, 80 of them in rodents, where boosting NAD+ improved mitochondrial function, metabolic markers, and in some models healthspan. The gap is the injectable form in people. That same review found no controlled outcome trials of subcutaneous, intramuscular, or intravenous NAD+ itself reporting anti-aging or wellness results, which makes the injected coenzyme the form with the least clinical evidence. The human signal that does exist sits almost entirely with oral precursors.

Evidence base, by subject

ExtensiveAnimal & mechanistic work

None to dateOutcome trials of injected NAD+

What people actually study and chase clusters in a few areas:

Cellular energyNAD+ is essential to the reactions mitochondria use to make ATP. The hope is that restoring it sharpens energy and physical performance, the most commonly reported subjective effect.

DNA repair & agingPARP enzymes spend NAD+ to repair DNA damage, and sirtuins use it to regulate stress and metabolism. More substrate, in theory, means more repair capacity.

Neuro & metabolicBrain cells lean heavily on NAD+ for energy, and it's been explored in cognition and metabolic health. Most of this is early or anecdotal.

The mechanism is settled in a way it isn't for most compounds in this market: NAD+ genuinely is a required coenzyme, and its decline with age is real and measurable. What's open is whether flooding the body with extra NAD+ from outside the cell raises it where it matters, inside the mitochondria, and whether that produces the durable anti-aging effects the marketing implies. Restoring a depleted level is a different claim from reversing aging, and only the first one is on solid ground.

Why people use it

People run it for energy, longevity, and recovery, but no human trial shows injected NAD+ slows aging and the 2026 review found none at all.

People who try NAD+ tend to land in one of a few situations. These are the reasons they reach for it, not evidence that it delivers:

Low energy and fatigue that hasn't responded to the basics, chasing the sharper, more wired feeling many users report after a dose.
A general longevity protocol, where someone is already optimizing sleep, training, and bloodwork and wants to act on the age-related NAD+ decline directly.
Recovery and cognitive clarity, often around travel, hard training blocks, or burnout, where a steady subcutaneous protocol is run as a reset.
Convenience: dosing at home a few times a week with a small subcutaneous injection rather than booking clinic time.

No human trial has shown injected NAD+ slows aging or extends life, and a 2026 systematic review found no outcome trials of the injectable form at all. What's there is airtight biochemistry, a real and measurable age-related decline, strong animal data on precursors, and a consistent subjective report of more energy. That's enough to make it worth understanding. It isn't enough to treat it as proven, and it won't substitute for the things with hard evidence behind them: sleep, training, and metabolic health.

How to reconstitute NAD+

Mix a 500 mg vial with 3 mL bacteriostatic water for about 167 mg/mL, so 30 units draws roughly 50 mg; swirl gently, never shake.

Subcutaneous NAD+ ships as a lyophilized powder you reconstitute yourself, the same way you'd handle a peptide, and that's the form the steps below cover. The clinic IV version is mixed into a saline bag by a provider; it isn't something you prepare at home. For the at-home subcutaneous draw, the routine is simple and worth getting right.

Step 1Start with powderWipe the rubber stopper with an alcohol swab.

Step 2Add bac. waterRun it slowly down the inside wall — never shake.

Step 3Draw your doseThe calculator gives the exact units to draw to.

Wipe the rubber stopper with an alcohol swab first, every time.
Use bacteriostatic water, not plain sterile water and not saline. The trace of benzyl alcohol in it holds back bacteria, which matters because you'll be drawing from the same vial over days.
Add the water slowly, running it down the inside glass wall. Don't blast it straight onto the powder.
Don't shake it. Swirl gently and let it dissolve on its own. Shaking foams the solution and stresses the compound.

A common setup is a 500 mg vial mixed with 3 mL of bacteriostatic water, which gives about 167 mg/mL. On a U-100 insulin syringe, 30 units of that mix is roughly 50 mg. The water doesn't change how much NAD+ is in the vial; it only sets the concentration, which decides how many units you draw. More water means a more dilute mix and a bigger draw for the same dose. You can't ruin it with too much or too little, you only change the draw math, and that's exactly what the calculator handles.

Calculate your exact NAD+ reconstitution →

Dose & units

No FDA dose; subcutaneous protocols report about 50–100 mg a few times weekly, far higher than peptides, with slow step-ups to avoid flushing.

There is no FDA-approved dose for NAD+, because there's no FDA-approved NAD+ drug. Everything below is a range that clinics and compounding protocols report, not a medical standard. NAD+ doses run far higher than peptides, milligrams to hundreds of milligrams rather than micrograms, so don't carry any peptide intuition over to it. Decide what goes into your body with a licensed provider, not with this page.

Typical range

Subcutaneous protocols commonly land around 50 to 100 mg per injection, given a few times a week rather than daily, and that's the range the calculator is set up for. For context, clinic IV sessions run much higher, often 250 to 1000 mg infused slowly over hours, and intranasal sprays are dosed far lower and absorb less reliably; neither is the at-home draw this page covers.

Titration

This is the part that actually matters with NAD+. Many subcutaneous protocols start well below the target, for instance around 50 mg once weekly, and step up over successive injections as tolerance builds. The reason is comfort, not just caution: pushing the dose up too fast brings on the flushing and chest-pressure reaction described below. Stepping up gradually keeps it in check. There's no medal for starting high.

Cycling

NAD+ isn't cycled on-and-off the way recovery peptides are. People tend to run a loading stretch of more frequent subcutaneous injections, then settle into a lower maintenance cadence. Schedules vary widely between protocols, which itself tells you how soft these numbers are.

Titrate uplow → target

Maintainongoing

Periodicas desired

For the exact mark to draw to on your insulin syringe, don't eyeball it. The calculator turns your vial size, water, and dose into the precise number of units.

Get your exact units →

Storage

The sealed powder is fragile and best kept frozen near −20 °C; once mixed, refrigerate and use within about 2 weeks.

Sealed & dryKeep the sealed lyophilized vial frozen near −20 °C and protected from light, not at room temperature.

ReconstitutedRefrigerate at 2–8 °C and use within about 2 weeks; don't freeze, keep out of light, discard if cloudy or deeply discolored.

Longer windows you see quoted are beyond-use dates for sealed, unmixed vials a compounding pharmacy has stability-tested, and they stop applying the moment you add water. A mixed vial runs on the shorter clock instead, because that's how long the preservative in bacteriostatic water reliably keeps the solution clean once you're drawing from it.

That two-week limit is about sterility, not potency. Reconstitute with plain sterile water instead of bacteriostatic and you drop to a day or two, since there's no preservative holding bacteria back.

Don't freeze a reconstituted vial, keep it out of direct light, write the mix date on the label, and throw it out if the solution ever turns cloudy, deeply discolored, or off, whatever the date says. NAD+ solutions can pick up a yellow tint over time, and a strong color shift is a reason to discard.

Side effects & safety

Pushing the dose up too fast triggers flushing, chest pressure, and nausea that fade within minutes; step up gradually rather than jumping high.

The defining side effect of NAD+ is dose-rate-dependent, and it's the one thing every first-timer should know going in. Pushed too fast, NAD+ triggers an intense reaction: flushing, a tight or pressured feeling in the chest, nausea, and sometimes a racing heart or light-headedness. It's uncomfortable rather than typically dangerous, and it fades within minutes of slowing down. It's thought to happen because rapid delivery converts some NAD+ toward nicotinic-acid-like activity, which dilates vessels and can trigger the prostaglandin release behind the flush. With a subcutaneous protocol the lever you control is how quickly you step the dose up, not an infusion rate.

With subcutaneous: redness, swelling, or soreness at the injection site, and a milder version of the flushing if the dose is stepped up too quickly.
If the dose climbs too fast: flushing, chest tightness or pressure, nausea, head-pressure, a pounding heartbeat. These ease as the level settles and back off when you drop the dose.
More general and short-lived: fatigue, headache, or stomach upset in the hours after a dose.

Chest pressure that doesn't ease, severe or persistent nausea, or any reaction that feels disproportionate is a reason to stop and get medical attention, not to push through. Step the dose up gradually rather than jumping to a high one. Talk to a doctor before starting if you're pregnant, breastfeeding, managing a heart condition, or on medication, since this is an unstudied compound in those situations.

For athletes, NAD+ is in a different position than the recovery peptides. As a vitamin-B3-derived coenzyme, NAD+ is not named on the WADA Prohibited List, and neither is the precursor NMN. That said, WADA's S0 category leaves room to treat any non-approved substance as prohibited, and supplements in this market are a known source of undeclared contaminants, so a clean source still matters for anyone tested.

Which is the real risk here. The molecule itself is something your body already makes; the danger is whether what's in the vial is actually NAD+, at the strength on the label, and free of the contaminants that cause bad reactions. That comes down to where you buy it.

How to vet a source

NAD+ degrades easily, so freshness matters as much as purity — demand a batch-specific COA and match the lot number to your vial.

This is an unregulated market, and independently tested vials regularly come back underdosed, impure, or degraded. NAD+ is also less stable than most peptides, so handling and freshness matter as much as the starting purity, and you can't see any of that in the powder. Where you buy matters more than almost anything else here. The one document that separates a real seller from a gamble is a certificate of analysis: a third-party lab's report on what's actually in the vial.

A real COA shows

An identity test (usually mass spectrometry) confirming the peptide is what the label says.
A purity figure from HPLC, typically 98% or higher.
A lot or batch number that matches the number printed on your vial.
A named, independent accredited lab and a recent test date.

Walk away if

There’s no COA, or it’s a generic image with no lot number.
The “certificate” comes from the seller instead of a third-party lab.
The lot number doesn’t match your vial, or there isn’t one at all.
It’s a flat image you can’t trace back to the lab that issued it.

That's the standard worth holding any seller to, ours included. Ask for the batch-specific COA before you buy, match the lot number to your vial, and don't accept a screenshot in place of a traceable report.

See the Zapify compound catalog →

Common questions about NAD+

Is NAD+ a peptide?

No. NAD+ is a coenzyme, nicotinamide adenine dinucleotide, built from two linked nucleotides and derived from vitamin B3. Peptides are short chains of amino acids; NAD+ has no amino-acid sequence. It's grouped with research peptides commercially because it's sold and injected the same way, but biochemically it's a different kind of molecule.

Is injectable NAD+ FDA-approved or proven for anti-aging?

No. There's no FDA-approved NAD+ drug. Injectable NAD+ is made by compounding pharmacies under section 503A and given by prescription, and the FDA hasn't evaluated that formulation's safety or efficacy. A 2026 systematic review found no controlled outcome trials of injected NAD+ reporting anti-aging results. The biochemistry and the age-related decline are real; the claim that injecting it reverses aging isn't proven in people.

Why does NAD+ make people feel awful, and how do you avoid it?

It's the rate of delivery. Pushed too fast, NAD+ brings on flushing, chest tightness, nausea, and a racing heart, which is generally attributed to rapid delivery shifting some of it toward nicotinic-acid-like activity that dilates vessels and triggers prostaglandin release. On a subcutaneous protocol the fix is to start at a lower dose and titrate up over successive injections rather than jumping straight to a high one; the reaction is far milder at the doses and absorption rate of a subQ injection than with a fast clinic IV.

Subcutaneous, IV, or intranasal — what's the difference?

Subcutaneous is the at-home route Zapify supplies: you dose consistently a few times a week with a small injection, which many find produces steadier levels and avoids booking clinic time. IV delivers the highest peak levels but ties you to a clinic, takes hours, and carries the most flushing risk if run fast. Intranasal is the lowest-dose and least reliable for absorption. Oral NAD+ is mostly broken down in the gut, which is why precursors like NMN are the more common pill.

Is NAD+ banned for athletes?

NAD+ is not named on the WADA Prohibited List, and neither is the precursor NMN, since both are derived from vitamin B3. That's a real difference from peptides like BPC-157 and TB-500, which are prohibited. The caveat: WADA's S0 category can cover non-approved substances, and unregulated supplements are a known source of undeclared contaminants, so a tested source still matters for anyone subject to testing.

References

This page is for research and educational purposes only. It is not medical advice or a recommendation to use any compound. The dose ranges shown are reported by clinics and research literature, not validated medical standards, and NAD+ is not FDA-approved. Talk to a licensed medical provider about anything you put in your body.