Editorial policy
Last updated October 2026.
Author, publisher and sources
Tomas Lindqvist is the author credited on articles and provider pages; nadcost is the publisher. We do not claim that articles were written or reviewed by a clinician unless a real, identified contributor has done that work. Provider pages analyze published information; they do not describe firsthand treatment or enrollment unless explicitly documented. New consumer guides distinguish primary-source evidence, purchasing analysis and illustrative examples.
How providers get on the site
A provider is listed because it sells NAD+ to consumers in the United States and publishes enough about the price to be worth comparing. It is not listed because it pays us, and it is not left off because it does not — the roster contains providers that pay this site nothing, and the disclosure page sets out what a commercial relationship can and cannot move.
How prices are read
Every price is read by hand from a page the seller publishes, and the page and the date are recorded with it. Nothing is scraped out of free text and nothing is inferred from a range. Where a seller states a price without a dose, or a dose without a price, the row is left out of the ranking rather than estimated into it.
A price is never printed without its qualifier. “$189” on its own is not a fact about anything; “$189 per month, month-to-month, read September 2026” is. A reading date lets you judge how recently a figure was checked. It does not promise that the offer is unchanged today.
Whose arithmetic each number is
Cost per milligram is a division this site performs. The milligram total usually is not: of the 18 totals on the board, 13 are printed by the seller and only 5 are this site multiplying a stated concentration by a stated volume. Both say so on the line where they appear when they are ours, and the division is printed underneath the result so it can be checked. Where a seller publishes its own equivalence — “works out at $X a month” — that is quoted separately as theirs, in the seller’s own words, so a reader can always tell which of the two numbers came from whom.
What we will not say
No cheapest provider, because the prices are not comparable enough to name one. No per-month figure a seller does not state, printed as though the seller stated it. No route called expensive, because expensive is a judgment and the number is the finding. And nothing here is offered as medical advice: what to take, and whether to take it, is a question for a licensed clinician.
How often it is re-checked
Every price here was read on one day, and that date is printed beside it wherever it appears. It tells you when a person looked, not that anyone has looked since. When a fresh reading changes a number, the change is logged on the corrections page, and the date beside the figure moves with it.
What a commercial relationship changes
We have affiliate partnerships with many, but not all, of the sellers here: they pay us a commission when a reader signs up through our link. This is everything that changes for them, surface by surface.
- The boards ranked by cost per milligram — the lowest-cost board, the route boards and the ranked scale on the home page — are ordered by the division and nothing else. A partner sits wherever the arithmetic puts it, and that position is not for sale. Its row differs only by a small “Verified partner” badge beside the button.
- The seller index at /reviews lists sellers rather than ranking them. Partners are listed first and marked “Verified partner”; the rest follow alphabetically.
- The partner cards — the card at the top of the side rail and the offer cards above the lowest-cost board — show partners only, each marked “Verified partner”. The box that can open when you follow a link to a seller that does not pay us also offers partners only, and says so in its own words.
Payment does not change which sellers are listed, how a price is read or divided, or what a seller’s review page says about it, apart from a partner badge. The rest of it, in full, is on the disclosure page.