People searching for a NAD⁺ dosage chart are looking for something that does not exist, and the reason it does not exist is worth understanding before you go looking somewhere less careful.
A dosing chart for an approved drug comes from trials that established what dose produces what effect at what risk. Injectable NAD⁺ has no such trials. It is a compounded preparation, not FDA-approved, with no controlled outcome studies behind the benefits it is sold for — so there is nothing for a chart to be built from. Any site publishing one is inventing it.
What we can give you is the real thing underneath: the doses actual researchers administered, and the doses actual products state. Both are attributed. Neither is a recommendation, and the decision belongs to a clinician who knows your history.
Doses used in published human trials
NMN, dose-ranging. A randomized, double-blind, placebo-controlled trial randomized 80 healthy middle-aged adults (n = 80) for 60 days to placebo or 300 mg, 600 mg or 900 mg of NMN once daily. Blood NAD rose significantly in every NMN arm at day 30 and day 60 (all p ≤ 0.001) [1].
NMN, safety. A separate study administered 1,250 mg of β-NMN orally once daily for up to four weeks in 31 healthy adults aged 20–65, and reported no adverse events over the study period [2].
NR, high-dose safety. The NR-SAFE trial randomized 20 people with Parkinson’s disease 1:1 to NR 1,500 mg twice daily or placebo for four weeks. Its own background notes that doses above 2,000 mg daily had not previously been tested in humans[3] — which tells you how thin the high-dose evidence was before that study, and how far outside it most marketing sits.
NR, retail serving. Tru Niagen sells a 300 mg capsule it describes as its minimum daily recommended serving. That is a manufacturer’s serving size, not a trial dose.
What injectable providers state
Here is the finding that should shape how you shop: among the NAD⁺ injection providers we can verify, almost none publish the dose their monthly price buys. They publish $169 or $199 a month and leave the milligrams unstated.
That makes their prices genuinely incomparable, and it is the single most useful question to put to any of them before paying. If you get a number, our cost-per-milligram calculator turns competing offers into a figure you can line up. If you do not get a number, you have learned something about how they sell.
Why we will not publish a chart
We could rank for this query more easily by publishing a table of milligrams by body weight. We are not going to, and it is worth being explicit about why: that table would be fabricated. There is no outcome trial to derive it from, the product is not FDA-reviewed, and presenting invented numbers as clinical guidance for an injectable drug is the kind of thing that gets people hurt.
Take the trial doses above to a clinician and ask what is appropriate for you. If you want the cheaper, better-evidenced route first, that is an oral precursor — and see what is known about safety before starting anything.