NAD+ Dosage: What the Dosing Question Answers

Summary: The number is the least useful part of the answer here. Which product, by which route, with which evidence behind it, comes first.

This content is for informational purposes only and is not medical advice. Always consult a qualified healthcare provider before starting, changing, or stopping any medication.

NAD+ dosage searches expect a number and a schedule. What comes back is a spread of figures from clinics, sellers and forums that agree with each other loosely and rest on nothing you can inspect.

The reason is not that the information is hidden. It is that a dose, in the sense the question means, is a specific kind of object. It is a quantity that a named authority has approved, for a named condition, in a named population, after reviewing evidence, and has written down in a document a prescriber consults. For injected NAD+, no such document exists anywhere in the world.

Everything else offered under the word is a number somebody chose, and every NAD+ dosage figure in circulation began there.

Why NAD+ dosage is a stranger question than it first looks

Most dosing questions concern a substance the body does not make. You take it or you do not, and the dose describes the entire exposure.

This one concerns a coenzyme that every cell already produces, consumes and regenerates continuously. Your cells are running that turnover right now, at rates they regulate themselves, and no external quantity you could name relates to it in any simple way. There is no baseline number to top up to, because the relevant quantity is not a static pool sitting somewhere waiting to be filled.

That does not make the question meaningless. It does mean the mental model behind it, a tank with a level in it, is wrong before any figure gets attached, and figures attached to a wrong model inherit the error.

Milligrams of what, exactly

The word covers at least three commercial products, and a number quoted without naming one is unreadable.

An oral capsule of nicotinamide riboside or nicotinamide mononucleotide is a precursor. It is swallowed, absorbed and converted inside the body. Most of the controlled human research in this field used precursors of this kind, so a quantity from that literature describes an oral precursor and nothing else.

A clinic infusion is NAD+ itself, delivered into a vein over a period of time, where the rate matters as much as the total. A vial sold for injection is NAD+ powder that a buyer reconstitutes themselves and administers under the skin or into muscle. These are three different exposures, and quantities do not carry across between them.

When a page states a figure without saying which of the three it means, the figure has not been reported. It has been decorated.

The variable the word dosage leaves out

For an infusion there is a second quantity that matters at least as much as the total, and the dosing question almost never mentions it: how fast the total goes in.

The same amount delivered over a long sitting and the same amount delivered quickly are not the same exposure. Concentration in the blood rises differently, tissues see something different, and the experience of receiving it differs. Anyone who has spent time reading accounts of these infusions has encountered the practical folklore around slowing the drip when the person receiving it feels unwell. That is lore rather than a counted finding, and its existence tells you the rate is doing something, whatever the something turns out to be.

None of that appears in a figure quoted as a dose. A number of milligrams, detached from the duration it was delivered over, has dropped half the description of the exposure. This is one reason quantities cannot be moved between the three channels even in principle. A capsule has no infusion rate. A self administered injection delivers its contents in seconds. An infusion is spread across an appointment. Treating these as three ways of taking the same dose is treating three different exposures as interchangeable because they can be described using the same unit.

Approved injectable medicines handle this by specifying both figures, and often the diluent and the maximum rate as well, on a label that a nurse follows. That specification is part of what approval produces. For injected NAD+ there is no label to specify anything, so the second variable is left to whoever is holding the equipment.

Nobody derived these numbers

There are legitimate ways a human quantity comes into existence. A regulator can approve one after reviewing a full dossier. A published dose finding study in humans can establish a range, which is what the trials of approved medicines do. A clinical practice guideline written by a professional body can specify one. In animal research, a quantity is chosen by investigators for a species and reported as such.

Injected NAD+ has none of the first three. There is no approval anywhere, no marketing authorisation, and therefore no label. What circulates instead came from clinics that had to write something on a menu, from sellers who needed a suggested use line, and from forum posts copying both.

This is why the figures look consistent. Consistency across sources that copied one another is repetition, and repetition is the mechanism by which an arbitrary number becomes a familiar one. It is not corroboration, and no amount of it will ever become corroboration, because nothing new is being measured at any point in the chain. The NAD+ dosage on any two pages is very often the same figure twice.

What readers ask once the numbers stop making sense

Is there an official NAD+ dosage anywhere?

No. No medicines regulator has approved injected or infused NAD+ for any indication, so there is no approved quantity, no approved frequency and no approved duration. Oral precursor supplements are sold under food supplement rules in most markets, which is a different regime and not an approval of efficacy.

The clinic gave me a specific amount. Where did that come from?

Ask them, and notice what the answer refers to. A clinic can honestly tell you what it uses as standard practice. That is a description of their practice, not a derivation from evidence, and the two sound similar when spoken confidently in a clinical setting.

Why do so many sources land on similar figures?

Because a small number of early sources were copied widely. Independent agreement would mean separate groups measuring separately and arriving at the same place. Shared agreement from a shared origin looks identical from outside and means nothing.

Can I scale from an animal study?

Not usefully, and not safely. Converting an animal quantity to a human one is a technical exercise involving species differences in metabolism and body size, it is done by people trained to do it, and it produces a starting point for a supervised trial rather than a dose for a person. Nobody in a forum thread performs that conversion, which is why animal figures that appear in these discussions are usually just numbers that have been lifted.

If the body makes it anyway, does the quantity matter?

Yes, and arguably more than usual. Endogenous production is regulated by the cell. An infusion or injection bypasses that regulation completely, delivering a quantity chosen by whoever is selling it, at a rate they chose, with no counter mechanism. Being natural does not make a bolus of it a physiological event.

The three channels, and what each one carries

The final column is the one that changes as you read down. Every other difference between these channels is a matter of convenience or price. That one is a difference in what happens if the quantity turns out to be wrong.

What is left when the number goes

A reader who came for a figure and leaves without one has not been fobbed off. An NAD+ dosage that no authority stands behind is not a smaller version of a real one. They have been told the actual state of the question, which is that the figure they wanted does not exist in a form anyone stands behind.

There are still useful things to hold. Which intervention a claim refers to, precursor by mouth or NAD+ into a vein, determines whether any given piece of research applies at all. The route determines the exposure, so a quantity from one route does not describe the other. And the absence of an approved dose is not an administrative gap that a confident clinic or a well formatted vendor page fills in. It reflects the fact that the work required to establish one has not been done and reviewed.

If you are already using something in this category, the practical step is to tell a clinician what you have taken and by what route. They cannot look up a label that has not been written, but they can consider it alongside your other medicines, monitor you, and interpret anything unexpected in context. That is worth more than a number, and unlike the numbers in circulation, it comes from someone who is accountable for what they tell you.