NAD+ Injection Dosage: How Much, How Often, and What the Evidence Supports

Start with what most pages selling NAD+ will not say in the first paragraph. NAD+ is not a peptide. It is a coenzyme, built from a nicotinamide and an adenine nucleotide, with no amino acid chain in it at all. It sits on peptide vendor shelves because it arrives in the same lyophilised vials, is reconstituted the same way and is bought by the same people. The category is a distribution accident rather than a chemical family.

That matters for dosing, because it explains why NAD+ numbers look enormous next to everything else in the drawer. Peptides are dosed in micrograms. NAD+ is dosed in tens or hundreds of milligrams, a thousandfold change of scale. What follows is the protocol detail: routes, ranges, the flush and the arithmetic. For how NAD+ compares against other options, see the peptides for energy guide and the longevity ranking.

What NAD+ Actually Does

In plain English, NAD+ is the cell's electron shuttle. Almost every reaction that extracts energy from food hands off electrons, and NAD+ carries them to the electron transport chain where the cell turns them into usable energy. It cycles between an oxidised and a reduced form rather than being consumed, which makes it a coenzyme and not a fuel. Separately, it is the substrate used up by the sirtuins and by the PARP enzymes, involved in DNA repair.

The age related decline is the best supported part of the picture. Levels do fall. What is far less settled is whether raising circulating NAD+ by injection changes anything a person notices or a test measures, and that is the gap most marketing walks over. NAD+ is a large charged molecule, so uptake of the intact coenzyme is questionable. It may simply be broken down and rebuilt inside the cell, in which case injecting the finished article offers nothing over a precursor.

Why Subcutaneous and Intravenous Get Discussed Differently

Intravenous NAD+ is a clinic procedure: several hundred milligrams over a slow infusion lasting much of an afternoon, with the rate dialled down whenever the recipient becomes uncomfortable. It is slow because speed, not total quantity, produces the unpleasant sensations.

Subcutaneous NAD+ is a self administered injection of a much smaller quantity into abdominal fat, absorbed over a period rather than delivered straight to circulation. It trades peak exposure for convenience and cost, and the doses reflect that. No published comparison of the two routes against a meaningful endpoint exists, so the choice is practical rather than evidence led. One consequence is worth stating plainly: an IV figure delivered subcutaneously in a single push is a common and avoidable mistake. The routes do not share a range.

Subcutaneous Dose Ranges and Frequency

No dose finding trial establishes a subcutaneous NAD+ dose. The ranges below come from clinic practice and community protocols, so they describe what people do rather than what has been shown to work. They are consistent across sources, but a convention is not evidence.

The shape is consistent too. Subcutaneous NAD+ is dosed intermittently rather than daily: typically 50 to 100mg per session, two or three times a week, for a weekly total of roughly 100 to 300mg. Wider ranges reaching 500mg per session are quoted, and no dose response curve suggests the upper end achieves more.

Notice which variable moves first. Frequency rises before dose, because a larger single push causes the discomfort and an extra session does not.

The Flush, and Why Slow Administration Is the Standard Answer

This is the best documented practical fact about NAD+ injections. Pushed quickly, NAD+ commonly produces a strong immediate sensation: flushing, a feeling of pressure or tightness in the chest or head, and often nausea. It arrives within seconds, peaks fast and fades over a few minutes once administration stops. It is close to universal at speed rather than idiosyncratic, which is why IV clinics infuse slowly.

The mechanism is not fully characterised, but the practical rule holds: the sensation tracks the rate of administration far more closely than the total dose. The same 100mg that is intolerable pushed in three seconds is often unremarkable delivered over a minute. So the standard answer has two parts. Push slowly, taking thirty to sixty seconds rather than treating it like a peptide shot, and pause if the sensation builds. Then titrate, starting low enough to be boring and raising only once the previous step is comfortable. The injection guide covers site rotation, which matters more here because the volumes are larger.

Reconstitution and Storage

NAD+ is reconstituted like a lyophilised peptide, covered in the reconstitution guide. Three points are specific to it.

Volume. Vials are commonly 500mg or 1000mg, so the water volume must be chosen so that a dose fits inside a one millilitre syringe.

Stability. NAD+ in solution is not indefinitely stable. Reconstituted vials belong in the refrigerator, protected from light, and the solution is treated as a short lived preparation of a few weeks rather than something kept for months. Discard one that has visibly discoloured. The storage guide covers the general rules.

Sterility. A 1000mg vial at 100mg a session is ten needle entries through one stopper across weeks. Swab it every time, and use bacteriostatic rather than sterile water.

Milligrams to Syringe Units, With a Worked Example

Concentration is vial milligrams divided by millilitres of water added. Volume per dose is the dose divided by that concentration. Units are that volume multiplied by 100 on a U-100 insulin syringe, where 100 units is one full millilitre.

Worked example. A 500mg vial plus 5mL of bacteriostatic water gives 100 mg/mL. A 50mg dose is 50 divided by 100, so 0.5mL, which reads as 50 units. A 100mg dose from the same vial is 1.0mL, the entire syringe, which leaves no room for error and makes a slow push awkward. Reconstituting that vial in 2.5mL instead gives 200 mg/mL, at which 100mg reads as 50 units.

For NAD+ the higher concentration usually wins, because a large subcutaneous volume is uncomfortable in itself. The NAD+ dosage calculator runs this for any vial and water combination.

NAD+ Against NMN and NR

NMN and NR are oral precursors: the cell takes them in and builds NAD+ from them through its own salvage pathway. Injectable NAD+ delivers the finished coenzyme to circulation instead. The argument for injecting is that it skips the digestive tract. The argument against is the uptake question above. Both are mechanistic rather than settled, because the head to head trial does not exist.

The practical asymmetry is harder to ignore. An oral precursor needs no needles, no reconstitution and no refrigeration, produces no flushing, and costs a fraction as much. That is not an argument that injectable NAD+ is useless. It is an argument that the burden of proof sits on the more expensive and less comfortable option, and has not been met, which is where the energy guide lands too.

Where the Arithmetic and the Expectations Go Wrong

• Carrying peptide intuition across. A figure in milligrams that looks like a typo usually is not.
• Using an IV figure subcutaneously. A several hundred milligram infusion dose pushed under the skin in one go is the most predictable way to have a bad time.
• Pushing fast and concluding NAD+ is intolerable. Someone who pushed 100mg in a few seconds has learned something about speed, not about the compound.
• Escalating because nothing was felt. Cellular metabolism and DNA repair are not perceptible. A dose increase after a week answers an endpoint that was never going to show anything.
• Buying the marketing. The established facts are that levels decline and the coenzyme is essential. Past that is hypothesis.

Key Takeaways

• NAD+ is a coenzyme, not a peptide, and appears here because of how it is sold
• Doses are in milligrams, a thousandfold scale change from peptide dosing
• Subcutaneous protocols cluster at 50 to 100mg, two to three times weekly, from practice rather than trials
• Flushing, pressure and nausea are common when NAD+ is pushed quickly, and slow administration is the answer
• Start low, raise frequency before dose, and treat the first fortnight as tolerance testing
• Oral precursors reach the same pathway far more cheaply, and the case for injecting is unsettled

The longevity guide ranks NAD+ against the alternatives, and the Epithalon page covers the one compound there with long term human follow up. This is research use information, not medical advice.

Frequently Asked Questions

What is the usual NAD+ injection dosage per day?

Most subcutaneous protocols are not daily at all. The common pattern is 50 to 100mg on two or three separate days, and people who do inject daily tend to use the low end, around 20 to 50mg. None of these figures comes from a dose finding trial. They come from clinic practice and community protocols, so the range describes what is done rather than what is correct.

What is the right NAD+ injection dosage and frequency?

There is no established answer, because the studies that would settle it have not been run. The widely used shape is two to three subcutaneous doses a week, starting near 25mg and rising only if the injection is comfortable. Frequency is usually adjusted first, because a larger single dose is what produces the flushing and pressure, while more sessions at the same size do not.

What is a typical NAD+ injection dosage per week?

Weekly totals in circulation usually fall between 100 and 300mg subcutaneously, assembled from two or three sessions. Higher totals are discussed, and the wider range quoted reaches 500mg, but no published dose response curve shows that more delivers more. A weekly total is a more useful frame than a per day number, because the schedule is intermittent.

What are the benefits of NAD+ injections?

What is established is that NAD+ is essential to energy metabolism and DNA repair, and that levels decline with age. What is not established is that injecting it produces a specific outcome in a healthy person. Reports of improved energy and clearer thinking are uncontrolled and susceptible to expectation. The honest summary is a solid mechanism, a real decline, and an unsettled case that this route changes anything measurable.

How much do NAD+ injections cost?

Two very different markets sit behind that question. Clinic administered intravenous infusions are priced per session and are by far the most expensive way to buy NAD+, because the cost is mostly the chair, the time and the supervision. Self administered vials cost a fraction of that per milligram, though NAD+ is dosed in hundreds of milligrams, so material cost stays high next to most of the shelf.