Research
Evidence reviews across every form NAD⁺ is sold in — injections, IV drips, nasal sprays, patches and oral precursors. No secondary summaries: every claim traced to the trial, the label, or the paper of record.
NAD⁺ cost calculator
Work out what a program actually costs per milligram — the only way to compare a $99 flat rate against a $169 annual prepay.
Head-to-head comparisons
Two providers side by side on price, dose disclosure, format and states served — scored on the same rubric.
Grade a claim you were shown
Pick the benefit you were promised and the format you were sold, and see the evidence grade for that exact pairing — plus the oral-precursor study it was borrowed from.
79 articles
- Evidence
NAD⁺ and heart failure: what three clinical trials actually found
Controlled NAD⁺ and NR trials in heart failure exist. Their results separate early cardiac and blood-marker findings from unproven long-term treatment benefits.
4 min read - Evidence
NAD⁺, brain fog and memory: higher blood levels did not improve cognition
Three small randomized NR trials raised interest in brain biomarkers, but none established better cognition. Here is what the measured outcomes show.
4 min read - Evidence
NR and Parkinson’s disease: what NADPARK and NR-SAFE established
Early NR trials showed biological activity and short-term tolerability in Parkinson’s disease. They did not establish slower disease progression.
4 min read - Evidence
NAD⁺ and long COVID: what the randomized NR trial found
A 58-person trial raised blood NAD⁺ but did not show significant benefits over placebo for cognition, fatigue, sleep or mood. Exploratory findings need confirmation.
4 min read - Evidence
NR and peripheral artery disease: how much did walking improve?
The NICE trial found a modest walking-distance signal with NR. Its statistical threshold, adherence analysis and resveratrol result are essential context.
4 min read - Evidence
NAD⁺ and kidney disease: what the acute kidney injury pilot can tell us
A small hospital study tested NR plus pterostilbene for two days. It measured blood NAD⁺ and short-term safety, not proof of kidney recovery.
4 min read - Evidence
NAD⁺ and the gut microbiome: what microbes change, and what remains unproven
Gut microbes can transform NAD⁺ precursors. Mouse tracing, human blood measurements and microbiome studies answer different questions about that process.
4 min read - Safety
How to find and evaluate an NAD⁺, NR or NMN clinical trial
Use the registry to check the actual intervention, eligibility, recruitment, outcomes and study contacts. A registration is not proof that a treatment works.
4 min read - Formats
The advertised NAD⁺ price is usually not the price
We read the pricing page of every NAD⁺ seller we cover. On most of them the number in the largest type is not the number that repeats — and the gap has twelve recognizable shapes.
6 min read - Safety
503A or 503B: what your NAD⁺ seller means by it
Two sections of one federal law, quoted at you as if they were quality grades. One is a real difference in who inspects and to what standard — and neither makes a compounded drug FDA-approved.
6 min read - Formats
“20 units” of NAD⁺ is how many milligrams?
The syringe measures volume, not drug. Two steps converts the number in your instructions into the number you actually want — and shows why the same 20 units can be 20 mg or 40 mg.
5 min read - Safety
What a LegitScript badge on a NAD⁺ site actually proves
We requested four real seal images and two invented ones. The real ones were identical to each other, byte for byte — which tells you what the badge can and cannot establish.
6 min read - Safety
How long does a NAD⁺ vial actually last?
Compounded medicines carry a beyond-use date, not an expiry date — and it often starts running before the vial ships. Most sellers never mention it at all.
6 min read - Safety
How to read a supplement certificate of analysis
One question separates a laboratory report from a picture of one: can you find a number that could have come out differently? Worked through real certificates, good and bad.
6 min read - Formats
Can you pay for NAD⁺ with an HSA or FSA?
Many sellers accept the card. That is a decision by the merchant, not a ruling on whether the expense qualifies — and the IRS treats a capsule and a prescription differently.
6 min read - Formats
The crossed-out price on a NAD⁺ page
A discount that never ends is not a discount. One seller shows $91 against a struck-through $449 — across the whole catalog — and another runs a countdown that resets itself forever.
5 min read - Formats
The NAD⁺ sellers who won’t tell you the price first
A third of the sellers we review publish no price at all. To get a number you have to complete a medical questionnaire first — here is what that costs you besides the time.
5 min read - Evidence
Does NAD⁺ actually decline with age?
It is the opening line of nearly every sales page. The largest community measurement — 1,518 people — found the decline in men only, and by less than the ordinary variation between two people the same age.
6 min read - Formats
What happens when you want to stop taking NAD⁺
The discount for a longer plan and the difficulty of leaving it are the same number. Here is what sellers actually commit to on canceling, refunds and the shipment that goes out anyway.
5 min read - Evidence
How would you know if your NAD⁺ is working?
You can measure NAD⁺ in blood. That answers a question the trials already answered — and not the one you have. Here is what a test can tell you, and why your own impression is the least reliable instrument available.
6 min read - Safety
Who actually makes your NAD⁺?
The company selling you compounded NAD⁺ is usually not the company that makes it. A licensed pharmacy does that — and most sellers will not tell you which one, which removes every check you could otherwise run.
6 min read - Formats
Four ways NAD⁺ sellers bill you, and only one is monthly
A four-week cycle is thirteen charges a year, not twelve. A per-session price has no cycle at all, and a per-vial price has no time in it. The number on the card is the same in every case.
5 min read - Safety
Three different products are sold as NAD⁺
A compounded prescription drug, a dietary supplement and a cosmetic patch sit under three different sets of rules — different sellers, different requirements, different recourse. The label says NAD⁺ for all three.
6 min read - Evidence
What is NAD⁺? The coenzyme, the claims, and what the trials actually show
NAD⁺ is a coenzyme every one of your cells already uses, and its levels fall with age. That much is settled. What raising it back up actually does for you is a very different question — and the answer explains why the cheapest form has the best evidence.
7 min read - Evidence
NAD⁺ benefits: what the trials measured, and the one they tested that did not appear
NAD⁺ is sold on energy, focus, sleep and slower aging. Here is what human trials have actually measured — including a randomized trial where NR did not alter cognition at all.
7 min read - Evidence
NMN vs NR vs NAD⁺: what the difference actually is, and which has the better evidence
NMN and NR are not alternatives to NAD⁺ — they are the two common routes to it. Here is what each has been shown to do in human trials, which has more evidence behind it, and why both beat an injection on cost and data.
6 min read - Formats
What are NAD⁺ injections? How the shot works, what it costs, and what it is legally
A NAD⁺ injection is a compounded preparation shipped to you by a telehealth prescriber. Here is what that means, what it costs, and how it compares with the cheaper format that has better evidence behind it.
6 min read - Formats
NAD⁺ dosage: the doses used in trials, and why no honest chart exists
There is no NAD⁺ injection dosage chart, because controlled trials have not established a wellness dosing schedule. Here are the doses researchers actually administered, what products actually state, and the question to ask before you pay.
8 min read - Evidence
NAD⁺ injections before and after: what those photos can and cannot tell you
Before-and-after galleries show one person, chosen by the seller, with nothing controlled. Here is what a photo can actually establish — and the outcomes that were measured when researchers ran real trials instead.
6 min read - Evidence
Does NAD⁺ help with weight loss? What one trial found, and why it is not the claim
A trial of an NMN product did record a reduction in body weight — as one line in a broad panel, over 28 days, in adults already at metabolic risk. Here is why that is not a weight-loss result, and what NAD⁺ is actually for.
5 min read - Evidence
Is NAD⁺ a peptide? No — and what that tells you about who is selling it
NAD⁺ is a dinucleotide coenzyme, not a peptide. Here is the actual difference, why the whole industry blurs it, and what a seller misclassifying its own product should tell you about the rest of its claims.
5 min read - Safety
NAD⁺ side effects: what the safety trials show, and where there are none
Oral NAD⁺ precursors have been through dedicated safety trials and were well tolerated. Injections and IV drips have no comparable evidence base at all — and that difference is the one worth understanding before you choose a format.
6 min read - Formats
NAD⁺ IV therapy: what a drip actually does, and what it costs you
IV NAD⁺ is the most expensive way to buy it and the least studied. Here is a human pharmacokinetic pilot, what a 2026 systematic review found when it went looking for outcome trials, and the arithmetic sellers leave out.
7 min read - Formats
Liposomal NAD⁺: does the fat bubble actually get it in?
Liposomal NAD⁺ is sold on surviving digestion where plain NAD⁺ cannot. We searched for the study proving it. Two of three PubMed searches returned nothing, and the one relevant paper was done in cells and skin explants.
6 min read - Evidence
NAD⁺ vs NAC: two acronyms, two completely different molecules
NAD⁺ and NAC get compared because the letters look alike. One is a coenzyme in energy metabolism; the other is a glutathione precursor and an approved hospital antidote. Here is what each actually does.
5 min read - Formats
NAD⁺ therapy: the five things sold under that name, and what each is worth
NAD⁺ therapy covers capsules, injections, nasal sprays, patches and IV drips — prices differ tenfold and the evidence differs more. A map of the whole category, cheapest first.
8 min read - Formats
NAD⁺ shots: how often, where, what they feel like, and what to ask first
The practical questions about NAD⁺ shots — frequency, injection site, side effects, timelines — answered without inventing the dosing guidance nobody can honestly give.
6 min read - Evidence
NAD⁺ injection benefits: what is actually demonstrated, and what is borrowed
Every seller lists the same benefits for NAD⁺ injections. We searched for the trials behind them — four PubMed searches, one returning zero results — and found the evidence belongs to a different product.
7 min read - Safety
Is NAD⁺ FDA-approved? No — and here is how four sellers word it instead
No NAD⁺ product sold for energy or anti-aging is FDA-approved. But "FDA-registered pharmacy" sounds like it means one thing and means another. Four verbatim examples, and the three sellers who just say it plainly.
6 min read - Evidence
What is NMN? The molecule, the one step to NAD⁺, and what raising it buys
NMN is one enzymatic step from NAD⁺, and human trials show it reliably raises blood NAD⁺. What two systematic reviews found about everything downstream of that is a much quieter story.
6 min read - Evidence
NMN supplements: what the trials show, and what to check before you buy
NMN is absorbed and raises NAD⁺ — that much is settled. What three systematic reviews found about glucose, lipids, muscle and body weight is the part the labels leave out, and it should shape what you pay.
8 min read - Evidence
Nicotinamide riboside: the best-studied NAD⁺ precursor, and what its trials found
NR raised whole blood NAD⁺ by 22%, 51% and 142% at three doses in a randomized trial. It also failed to change cognition, and failed to alter mitochondrial bioenergetics in aged muscle. Both halves matter.
8 min read - Evidence
Why people stop taking NMN — and what the evidence says about each reason
Cost, no felt effect, the gap between a blood marker and a benefit, and regulatory limbo. Three of the four reasons people quit NMN are backed by the published trials, including three meta-analyses that came back null.
8 min read - Formats
NMN dosage: every dose used in a published human trial, and no chart
From a single 100 mg dose to 1,000 mg twice daily — here is the complete list of NMN doses researchers have actually administered, each with its population and duration. No chart, because the literature cannot support one.
7 min read - Evidence
NMN before and after: what the trials measured, and why none of it photographs
NMN has a real randomized trial base — blood NAD⁺, walking tests, sleep scores, about two kilograms of body weight. Almost none of it would show in a photograph, and two PubMed searches for a trial that measured appearance returned nothing.
7 min read - Formats
Liposomal NMN: a premium for solving a problem plain NMN does not have
Liposomal NMN promises absorption ordinary NMN cannot achieve. Ordinary NMN already absorbs, in published human trials — and four PubMed searches found no human study of the liposomal version at all.
6 min read - Evidence
NMN vs resveratrol: bundled everywhere, and built on very different evidence
NMN raises NAD⁺ in every trial that measured it. Resveratrol was proposed to activate the enzymes NAD⁺ feeds — and in the trial that checked, it did not raise SIRT1 and it blunted the benefits of exercise training in older men.
8 min read - Evidence
NAD⁺ benefits for men: what is sex-specific, and what is shelf placement
Men's-health brands sell NAD⁺ next to testosterone and ED scripts. Three PubMed searches for testosterone, erectile function and fertility returned nothing. Here is what the men-only trials did find, and the one real sex difference that has been measured.
7 min read - Evidence
The best NAD⁺ supplement for women: what the women-only trials found
Two studies enrolled only women. One is the most cited positive trial in the field and it is about insulin sensitivity in prediabetes. The other is an open-label seven-day pilot. Neither tested a women's formulation, because nobody has.
7 min read - Evidence
NAD⁺ IV therapy benefits: what was in the bag, and what was measured
Wellness claims rely on limited evidence, including an uncontrolled combination-infusion series. Randomized heart-failure trials also exist, but their results do not establish benefits from a commercial wellness drip.
7 min read - Evidence
What does NAD⁺ do for the body? Two jobs, and one of them destroys it
NAD⁺ shuttles electrons through energy metabolism and is recycled forever doing it. It is also eaten by the enzymes that repair your DNA. The gap between how fast it is consumed and how fast it is rebuilt is the whole story.
7 min read - Evidence
NAD⁺ and alcohol: the hangover drip and the addiction clinics, read separately
For hangovers there is no human study at all — not a trial, not a case series. For addiction there is one uncontrolled series of fifty patients on a six-ingredient infusion, published twice. Two claims, two very different answers.
8 min read - Evidence
Does NAD⁺ help you sleep? What the three trials actually measured
Sleep is one of the few NAD⁺ claims somebody measured. Two trials of 250 mg oral NMN found improvements on self-report questionnaires — one as a secondary endpoint, one where the placebo group improved too. A third found nothing.
7 min read - Evidence
NAD⁺ vs NADH: the same molecule, two states — and two evidence bases
NADH is NAD⁺ carrying two electrons, not a rival molecule. Here is what the plus sign means, what the small NADH supplement trials actually found, and why the precursor evidence is far stronger than anything on the NADH shelf.
6 min read - Evidence
NMN vs NAD⁺: why you cannot simply take the coenzyme itself
NMN is a precursor, NAD⁺ is the coenzyme it becomes — and an oral NAD⁺ capsule is broken apart before it reaches your blood. Here is what the randomized trials measured, and why injecting the finished molecule has no established wellness benefit.
6 min read - Formats
NAD⁺ injection dosage: what sellers publish vs what trials used
No honest dosing chart exists for injectable NAD⁺, because wellness dosing has not been established in controlled trials. What can be published is the comparison: the milligram figures sellers state, and the far smaller doses the human trial literature has actually administered.
7 min read - Evidence
What does NAD mean in a medical note? Usually “no acute distress”
In a chart, NAD almost always stands for “no acute distress” — or sometimes “no abnormality detected”. It is very rarely the coenzyme sold as anti-aging therapy. Here is how to tell which one you are reading, and where to go if it was the molecule you wanted.
5 min read - Evidence
Nicotinamide, niacinamide and niacin: what is actually different
Nicotinamide and niacinamide are two names for one molecule — the amide form of vitamin B3 and the direct building block of NAD⁺. Niacin is a different compound, and it is the one that makes you flush. Here is how all three relate, and the one trial with a hard outcome.
6 min read - Formats
NAD⁺ infusion vs injection: the same molecule at 13 to 21 times the price
An NAD⁺ drip and an NAD⁺ shot deliver the same coenzyme. Using the sellers' own published figures, the drip works out at about $3.20 a milligram against $0.15–$0.25 for injections — and neither format has controlled outcome trials behind it.
7 min read - Formats
Where to inject NAD⁺: subcutaneous, intramuscular, and what no trial has tested
NAD⁺ is sold for both subcutaneous and intramuscular use, and the route depends on the prescription rather than a rule you can look up. Here is the real difference between them, what sellers instruct, and the searches showing no human trial has tested either.
7 min read - Safety
Is NAD⁺ safe? What the evidence can establish — and what it cannot
Oral precursor safety trials are small and short. IV heart-failure trials do not establish the safety of commercial wellness drips. Here is what each format’s evidence can and cannot tell you.
8 min read - Evidence
NAD⁺ vs glutathione: how they are actually connected, and what clinics sell
NADPH powers the enzyme that regenerates spent glutathione, so the two really are linked in a cell. What no published trial has tested is the thing clinics sell — the two together, in one bag, at infusion prices.
7 min read - Formats
What NAD⁺ injections cost — and the number sellers leave out
NAD⁺ injection plans run about $93 to $249 a month and IV sessions $749 to $799, but almost none publish the milligrams. Here are the four sellers whose prices can be converted to a cost per milligram, and what the conversion reveals.
7 min read - Formats
NAD⁺ 500 mg vs 1000 mg: is the higher tier supported by anything?
No published study shows 1000 mg of NAD⁺ outperforming 500 mg. The one proper dose-ranging trial in this area found its top dose no better than the middle one — and the tier you choose matters far less than the seller you choose.
7 min read - Safety
NAD⁺ supplement side effects: what the oral trials recorded
Stomach upset in a handful of people, one transient blood marker, and rates that mostly matched placebo. Here is the full adverse-event ledger for oral NR and NMN — including the manufacturer's own animal toxicology, and the point at which the human record stops.
8 min read - Safety
NAD⁺ injection side effects: what is documented, and what is not
One published chart review records what an NAD⁺ drip feels like — chest pressure, nausea, a racing heart, and an infusion slowed to nearly twice the length of the comparison. For NAD⁺ injected into muscle or under the skin, no human study has been published at all.
8 min read - Safety
NMN side effects: what the trials measured and what they found
Pooled across ten randomized trials, NMN did not raise adverse events, serious adverse events or liver enzymes against placebo. Here is which panels the investigators actually ran, the only published adverse-event rate, and the populations no trial has enrolled.
8 min read - Evidence
Nicotinamide riboside benefits: claim by claim, trial by trial
NR reliably raises NAD⁺ in humans. Then randomized trials measured insulin sensitivity with a clamp, cognition in mild cognitive impairment, fatigue in long COVID and muscle function in a meta-analysis — and most of them came back null. Here is every claim against the trial that tested it.
9 min read - Formats
NAD⁺ skincare: niacinamide has the data, NAD⁺ itself does not
Three different molecules are sold under one banner. Niacinamide has vehicle-controlled dermatology trials and oral nicotinamide has a phase 3 skin-cancer result — while the published human evidence for topical NAD⁺ is a single uncontrolled case series in which it was delivered by microneedling.
9 min read - Formats
How much NAD⁺ should I take? The milligram is not one unit
A 300 mg NMN capsule carries more NAD⁺-equivalent than a 500 mg injection vial, and a month of it carries about eighteen times a stated 1,000 mg monthly supply. Here is the arithmetic nobody prints, and why there is still no dose to aim for.
8 min read - Evidence
NAD⁺ and exercise: what the performance trials actually found
One trial in trained runners moved threshold power but not VO₂max. Two biopsy studies found no change in muscle mitochondria, a recovery trial found no change in stem cell recruitment, and two trials that added a precursor to supervised exercise added nothing measurable.
9 min read - Evidence
NAD⁺ and fasting: the link, and how much of it was measured
Sirtuins need NAD⁺ to work, which is why fasting and NAD⁺ supplements are sold together. In humans the link rests on a 24-hour fasting study in 19 people and a four-day crossover in 11 — and the combination itself has only been tested in mice.
8 min read - Formats
NAD⁺ oral vs injection: what the human trials actually support
Injection pages argue that oral NAD⁺ is destroyed before it reaches your blood. It is — but nobody sells oral NAD⁺. They sell a precursor, and the precursor has the randomized trials, the published absorption data and a fraction of the price.
7 min read - Formats
NAD⁺ nasal spray vs injection: cheaper at the same seller, and unmeasured in people
At sellers listing both, the spray is the cheaper line — $157.91 against $158.93 at one, $148 against $198 at another. What no seller publishes is how much of a sprayed dinucleotide reaches your blood, because no human study has measured it.
7 min read - Evidence
NMN vs NMNH: the reduced form works better in a dish, never in a person
NMNH raises NAD⁺ higher and faster than NMN in cells and mice — the potency claim is real. The same experiments report it inhibiting glycolysis and the TCA cycle and suppressing cell growth, and no human trial of it has ever been published.
7 min read - Evidence
NIAGEN vs NMN: a trademarked ingredient against an anonymous molecule
NIAGEN is not a different compound from NR — it is a trademarked crystal form sold by one company. That buys you traceable material and trials that name it, all of them funded by the seller. NMN buys you independent trials and no way to know what you received.
8 min read - Evidence
Sermorelin vs NAD⁺: two molecules that share a checkout and nothing else
Sermorelin is a peptide that tells the pituitary to release growth hormone; NAD⁺ is a coenzyme inside every cell. They appear together because they are sold together — and the human evidence for each was collected in people unlike the ones being sold to.
8 min read - Formats
NAD⁺ nasal spray: what it is, how it is dosed, and what nobody has measured
Compounded NAD⁺ in a pump bottle, at roughly injection prices. The nasal route is more credible than its critics allow — it carries molecules ten times heavier every day — but no published human study has measured whether a NAD⁺ spray delivers anything at all.
8 min read - Formats
NAD⁺ patches: what is in them, and the one human study that used one
Patch labels print anything from 1,300 mg to no figure at all, and one product sold as NAD⁺ contains none. A single human study has used a NAD⁺ patch — alongside a second drug, against no control group, measuring questionnaires rather than NAD⁺.
9 min read