NAD and NAD+: the pills, the drips, and what actually works
Including what the plus sign means, and why NR and NMN are not the same thing as the vial.
Last checked August 24, 2026. The regulatory position on NMN reversed once already — verify before relying on it.
Almost everyone who ends up here is chasing one of five things:
- Energy. By far the most common. Not sleepiness — the specific, grinding tiredness where you slept fine and still feel like you are pushing through mud. People who report a response usually describe it as a fog lifting rather than a stimulant hit, and typically within days rather than weeks.
- Longevity. Usually arrived at after reading that NAD falls with age and that it is involved in DNA repair and in the sirtuin pathway that keeps turning up in aging research. The reasoning is: this declines, decline is aging, so restore it.
- Mental clarity and focus. Often reported together with the energy effect and hard to separate from it.
- Recovery — from illness, burnout or hard training. Long COVID and chronic-fatigue presentations are a large and growing share of the people trying it, generally after conventional medicine has offered nothing.
- Addiction and withdrawal. IV NAD has been marketed by recovery clinics for decades, on remarkably little published evidence. It is also where the largest claims are made.
The underlying premise is real biochemistry, which is a large part of why it persuades people. NAD is a coenzyme every cell in your body needs — it is how the energy in food actually gets converted into the form your cells run on, and it is required for DNA repair. Levels genuinely do fall with age. None of that is marketing.
The leap is the next step: from "this molecule declines" to "topping it up reverses what the decline caused". That is where the argument gets interesting, and where most of the marketing stops examining itself.
One thing to hold in mind while reading the rest, because it applies to the first three items above more than anything else on this site: energy, clarity and wellbeing are the outcomes placebo moves most easily. They are subjective, they fluctuate anyway, and they respond to expectation. An expensive, mildly unpleasant infusion you had to book and travel to is close to a perfect setup for feeling better afterwards regardless of what was in the bag. That does not mean nothing is happening — it means personal reports, including your own, are weak evidence here in a way they would not be for, say, blood pressure.
NAD vs NAD+ — what the plus sign actually is
Think of it as a rechargeable battery, or a shuttle bus. NAD+ is the empty one. It goes and collects energy released when your cells break down food, and comes back full — at which point it is called NADH. It drops that energy off where the cell needs it, becomes empty again, and goes back round. Same molecule, two states, cycling constantly. Your body runs through its entire supply many times a minute.
The + is a chemistry notation for the electrical charge the molecule carries when it is empty. It is not a version number and not a brand — nobody made an improved NAD and called it NAD+. It is the correct name for the empty, ready-to-work form, which is why scientists write it and why supplement labels borrowed it.
Does the distinction matter when you are buying? No. Products labelled "NAD" and "NAD+" are the same thing, and when people say NAD declines with age they mean the whole supply, both states. If a seller implies their "NAD+" is an upgrade on someone else's "NAD", that is pricing, not chemistry.
Pills and needles are two different decisions
Everything sold under this heading falls into one of two groups, and almost everything that matters — whether it is licensed, whether it has been studied in people, whether anyone knows what is in it — falls along the same line. If you take one thing from this page, take the split.
Swallowed — the licensed, studied side
NR (nicotinamide riboside)
Licensed / legalA precursor — your body converts it into NAD. Sold as Niagen, among others. The reference point for everything else here.
Status: Legal as a supplement in Canada and the US. The most-studied of the group by a distance: 12+ published clinical trials, safe at up to 2,000 mg/day over 12 weeks with no serious adverse events.
NMN (nicotinamide mononucleotide)
Licensed / legalThe other precursor — one biochemical step closer to NAD than NR, which is the usual pitch for paying more. Whether that closeness matters in practice has not been demonstrated.
Status: Licensed in Canada as a Natural Health Product at 125–500 mg/day. Canada is more permissive here than any other major Western market. Permitted claims are only 'source of NMN' and 'provides antioxidants' — anti-aging and longevity claims are NOT approved.
NAD+ itself, in a capsule
Sold, but questionable routeThe finished coenzyme rather than a precursor. Usually the most expensive thing on the shelf.
Status: Sold, but the molecule is large and largely broken down in digestion — which is the entire reason precursors exist at all. Paying a premium for 'actual NAD+' in a capsule is usually paying more for a worse delivery route.
Injected — the unapproved side
Neither of these is an approved drug anywhere, and they are as different from each other as they are from the capsules: tens of milligrams at home versus hundreds under supervision, a vial from a vendor versus a clinic appointment, ten dollars versus several hundred. Experience with one says very little about the other.
Subcutaneous injections
Unapproved, evidence thinSelf-administered shots from a vial, at home. Small doses — typically tens of milligrams — taken often, sometimes daily. This is what most people mean when they say they are 'on NAD'.
Status: Not an approved drug. Cheap per dose, no supervision, and nothing verifying what is in the vial. Stinging at the injection site and flushing are the usual complaints. Generates most of the anecdotes you will read.
IV infusions
Unapproved, evidence thinA clinic drip: 250–1,000 mg over one to several hours, supervised, several hundred dollars a session.
Status: Not an approved drug for any indication. Offered as a wellness service, largely outside the framework that would require it to prove anything. Systematic safety data is thin despite very widespread use.
The strangest regulatory story in supplements
NMN was sold freely in the US for years. Then in late 2022 the FDA announced it could no longer be marketed as a dietary supplement — not because of any safety finding, but on a technicality: a provision saying a substance authorised for investigation as a drug cannot subsequently be sold as a supplement. Someone had filed a drug investigation, and that was that.
The industry sued. In September 2025 the FDA reversed itself, concluding there was sufficient evidence NMN had been marketed as a supplement before the drug investigation, so the provision did not apply. It is lawful in the US again.
Through all of which, Canada quietly permitted it the whole time, licensed as a Natural Health Product with a product number and a dose range. Worth noting because it is unusual — Canadian regulation is normally the more conservative of the two.
What the trials actually found
A systematic review published in February 2026 pulled together 113 intervention studies — 33 in humans, 80 in rodents. That ratio is already better than most things in this space, and the human trials give a genuinely mixed but not empty picture.
The precursors hit their biochemical target. Oral NR and NMN reliably raise NAD markers in blood and tissue. That part is settled: the supplement does the thing it says it does at the molecular level.
Whether that translates into anything you would notice is much less settled. Effects on metabolic, vascular and performance outcomes are mixed across trials. There are real positive findings — improved muscle insulin sensitivity in a 2023 NMN trial in postmenopausal women, modest blood-pressure reductions, reduced fatigue in older adults — but they are small studies and they do not all agree.
This is the gap worth holding onto: a biomarker moving is not an outcome improving. It is a necessary step toward one, and it is genuinely more than most longevity supplements can show. It is just not the same thing.
The evidence does not cross the line between the two groups
This is the most important sentence on the page. Almost every encouraging finding above comes from swallowed precursors. Injected NAD+ is a different molecule by a different route, and none of that research transfers to it. Nobody has shown that it does.
Clinics and vendors nonetheless cite the oral trials while selling the injectable — the NAD-declines-with-age premise, the biomarker data, the trial names. That is the single most common piece of sleight-of-hand in this category, and it is hard to spot precisely because the underlying research is real. It is just research about something else.
A rough test when reading any NAD marketing: if the product is a needle and the citation is a study, check which one the study used. It is almost always a capsule.
What the drips are actually like
Worth knowing before booking, because it is rarely mentioned in the marketing. Reported effects during an infusion include nausea, cramping, chest tightness and dizziness — which is why the drip is run slowly and why an appointment takes hours rather than minutes. Anyone who has had one will tell you it is not a pleasant experience. Going faster makes it worse, which is the constraint that sets the price.
The at-home subcutaneous route trades that for a different set: stinging at the injection site, flushing, and a supply chain with nothing verifying the vial. Cheaper, more convenient, and completely unsupervised.
Two things that are quietly useful to know
Swallowing NAD+ itself is the worst option on the shelf. It is a large molecule and mostly does not survive digestion intact. Precursors exist precisely because the finished coenzyme does not absorb well — so a capsule marketed as "real NAD+" at a premium over NR or NMN is selling the least effective delivery route at the highest price.
Canada does not allow the claims the product is bought for. The licensed claims are "source of nicotinamide mononucleotide" and "provides antioxidants". Nothing about aging, energy or longevity is approved. Any Canadian seller making those claims is outside their licence — which tells you something useful about how carefully they read the rules.
If you are trying one of these, the useful thing is knowing whether it did anything for you specifically — small effects in mixed trials are exactly the case where your own before-and-after matters. Titr logs what you took and when, and plots it against your own measurements over months.
General information, not medical advice, and not a recommendation to take anything described here. Supplements interact with medications; talk to a pharmacist or physician who knows what else you are on.