Anti-Aging · Reference
NMN vs NAD+: What Each Is, What the Trials Show, and Which Fits
This page explains each on its own terms, puts them side by side, covers what the research does and does not show, side effects, regulation, cost at Pepti, and who tends to suit which.
NMN (nicotinamide mononucleotide) is a building block the body converts into NAD+, usually taken by mouth as a supplement, while an NAD+ injection supplies the finished coenzyme itself. NMN has the randomized human trials: oral NMN raised blood NAD+ dose-dependently over 60 days in 80 healthy middle-aged adults, and improved muscle insulin sensitivity in a 10-week trial in postmenopausal women with prediabetes. NAD+ injections have the direct route but no randomized trials; the only human study of NAD+ given directly found an infusion was broken down as fast as it arrived, likely into fragments including NMN that cells rebuild. No study has compared the two head to head, so neither can be called better. Pepti prescribes NAD+ injections and does not supply NMN; compounded NAD+ is not FDA approved.
This page explains each on its own terms, puts them side by side, covers what the research does and does not show, side effects, regulation, cost at Pepti, and who tends to suit which.
NMN vs NAD+
The short answer
| If what you want is | The usual choice | What it involves | Price |
|---|---|---|---|
| The most randomized human evidence for raising blood NAD+ | Oral NMN or NR | Capsules or powder sold as supplements, no prescription | Not supplied by Pepti |
| NAD+ itself, bypassing the gut | NAD+ Injection | 1,000 mg in a 10 mL vial; 0.83 mL under the skin three times weekly | $249/mo |
| NAD+ by injection at a lower strength | NAD+ Injection (500 mg) | 500 mg in a 10 mL vial; same 0.83 mL draw | $229/mo |
| Prescribed support for the NAD+ pathway without NAD+ itself | 5-Amino-1MQ | 5 mg in a 5 mL vial; a separate product, not NAD+ | $219/mo |
Pepti's prices are all-in, covering medication, physician review, refill management and shipping, with no separate membership fee. Pepti is cash-pay and does not bill insurance.
NMN vs NAD+
How NMN and NAD+ are related
NAD+, nicotinamide adenine dinucleotide, is a coenzyme every cell makes and uses continuously. It picks up electrons from broken-down glucose and fat, becomes NADH, and hands them to the mitochondria to make ATP. It is also consumed as fuel by sirtuins, which regulate cell stress responses, and PARP enzymes, which respond to DNA damage. Because those enzymes use it up, the body has to keep rebuilding it.
Most of that rebuilding runs through a recycling route called the salvage pathway: nicotinamide is turned into NMN, and NMN is turned into NAD+. Nicotinamide riboside (NR) is another way into the same route. So NMN is not a different molecule competing with NAD+. It is the step immediately before it.
| NMN | NR | NAD+ | |
|---|---|---|---|
| Full name | Nicotinamide mononucleotide | Nicotinamide riboside | Nicotinamide adenine dinucleotide |
| What it is | The immediate precursor of NAD+ in the salvage pathway | Another precursor that enters the same pathway | The finished coenzyme |
| Usual form | Oral supplement | Oral supplement | Prescription injection, compounded |
| Randomized human trials | Yes, oral | Yes, oral | None for subcutaneous injection |
| Supplied by Pepti | No | No | Yes |
NMN vs NAD+
NMN on its own terms
What it is
NMN is a small molecule made from nicotinamide (a form of vitamin B3), a sugar and a phosphate group. It is sold in the United States as an oral dietary supplement, without a prescription. Supplements are not reviewed and approved by the FDA before sale the way drugs are, so the amount and purity in a product depend on its manufacturer.
What human data exists for NMN
The two randomized, placebo-controlled NMN trials most often cited:
Study Who What was reported Science, 2021 (Yoshino and colleagues) Postmenopausal women with prediabetes, 10 weeks Increased skeletal-muscle insulin sensitivity on clamp testing GeroScience, 2023 80 healthy middle-aged adults, 60 days, three doses Dose-dependent rises in blood NAD+; longer six-minute walk distances than placebo in all three dose groups; no safety issues on adverse-event, laboratory or clinical monitoring The 2021 trial is small and in a selected group, and the walking result in 2023 was modest.
The wider precursor evidence, mostly NR
Most of the precursor literature used NR rather than NMN, and it is the best human evidence on what raising NAD+ does:
Study Molecule What was reported Nature Communications, 2018 (Martens) NR, six weeks, healthy middle-aged and older adults Well tolerated; raised NAD+ in blood cells; a blood-pressure signal flagged for future trials Scientific Reports, 2019 NR, eight weeks, three doses, healthy overweight adults Dose-dependent rises in whole-blood NAD+; no reports of flushing; adverse events no different from placebo American Journal of Clinical Nutrition, 2018 (Dollerup) NR, 12 weeks, 40 obese insulin-resistant men No improvement in insulin sensitivity, glucose metabolism, energy expenditure or body composition Cell Metabolism, 2022 (NADPARK) NR, 30 days, 30 people newly diagnosed with Parkinson's Brain NAD levels rose on MR spectroscopy; clinical change described as mild Nature Communications, 2024 (NICE) NR, six months, 90 people with peripheral artery disease A 17.6-meter between-group improvement in six-minute walk distance; confirmatory trial called for The pattern across all of them: precursors reliably raise blood NAD+, while functional effects are small, inconsistent, and strongest in older or metabolically impaired participants. One insulin-sensitivity trial was positive (NMN, 2021) and one was negative (NR, 2018).
NMN vs NAD+
NAD+ injection on its own terms
What it is
A sterile solution of NAD+ itself, compounded by a licensed pharmacy and injected into the fat layer of the abdomen or thigh. At Pepti the directions are 0.83 mL (83 units on a U-100 insulin syringe) three times per week, which is 83 mg per dose from the 1,000 mg vial or 41.5 mg from the 500 mg vial, twelve doses per vial. The full arithmetic is in NAD+ injection dosage and the product reference in what is NAD+ injection.
What happens to NAD+ after it is given
NAD+ is a large, charged molecule and does not simply diffuse into cells. The only published study of NAD+ given directly to people, a 2019 pilot in Frontiers in Aging Neuroscience by Grant and colleagues, infused it intravenously over six hours in healthy participants. Plasma NAD+ and its metabolites did not rise at all for the first two hours; the molecule was cleared as fast as it arrived. The likeliest reading is that NAD+ given from outside is broken down outside cells into fragments, including nicotinamide and NMN, which tissues rebuild into NAD+ through the same salvage pathway a precursor uses. That is a hypothesis from one small infusion study, and nothing equivalent has been published for the subcutaneous route.
What human data exists for NAD+ injection
There are no randomized controlled trials of subcutaneous NAD+ injection in humans, and no randomized trial of NAD+ by any injected route with a clinical endpoint. The case for injection is that it bypasses the gut. Whether that produces anything beyond what an oral precursor does has not been tested.
NMN vs NAD+
Head to head
| Oral NMN | NAD+ injection | |
|---|---|---|
| What it is | A precursor the body converts to NAD+ | NAD+ itself |
| How it is taken | By mouth | Under the skin, three times weekly at Pepti |
| Has to survive the gut | Yes | No |
| Randomized human trials | Yes (2021, 2023), plus a larger NR literature | None for subcutaneous injection |
| Effect on blood NAD+ | Raised in trials | Not measured for subcutaneous injection; an infusion was cleared as fast as it arrived |
| Functional effects in trials | Small and mixed | Not tested |
| Prescription | No; sold as a supplement | Yes |
| Who makes it | Supplement manufacturers | A licensed compounding pharmacy, to a prescription |
| Lot testing | Depends on the manufacturer | Pepti publishes lot results at /quality/lab-results |
| Typical side effects | Precursor trials reported no recurring adverse-event pattern | Stinging at the site; flushing or nausea if injected quickly |
| Head-to-head trial | None | None |
| At Pepti | Not supplied | $249/mo or $229/mo |
The real difference is evidence versus route
People often ask which is "better." There is no trial that answers it. NMN has the better evidence that it raises blood NAD+ in people, but evidence that raising blood NAD+ produces outcomes people care about is thin for either. NAD+ injection has the direct route, but if the 2019 infusion data is right, injected NAD+ may be broken into fragments, NMN among them, that end up in the same pathway. So the two may arrive at the same place. Whether the injection is more effective, equivalent, or simply more expensive has never been tested. A provider who quotes NMN trials as proof that NAD+ injections work is skipping a step, and so is a supplement seller who quotes NAD+ biochemistry as proof that their capsule does something specific.
NMN vs NAD+
What the evidence shows, honestly
The biochemistry of NAD+ and its precursors is textbook. NAD+ is reported to fall with age in human tissue (PLOS ONE, 2012), and animal work links that to sirtuin activity. On top of that sit randomized trials of oral NMN and NR that reliably raise blood NAD+, with small, inconsistent effects on insulin sensitivity, walking distance and brain NAD. Nothing in either literature shows a slowing of aging in people. For NAD+ injection there is one infusion pilot and no outcome trial. There is also no validated routine clinical test for tissue NAD+, so neither a supplement nor an injection can be shown to be raising the NAD+ inside your muscle, liver or brain. The benefit-by-benefit picture is in NAD+ benefits.
NMN vs NAD+
Side effects
NMN and NR. The randomized precursor trials, which together enrolled several hundred adults for six weeks to six months, reported no serious adverse events, no organ toxicity and no recurring adverse-event pattern. The 2023 NMN trial reported no safety issues on adverse-event, laboratory or clinical monitoring.
NAD+ injection. Stinging or burning at the site is the norm, because NAD+ solutions are acidic, with redness or a small firm lump that resolves over a day or two. Flushing, chest or abdominal tightness, or nausea during the injection are reported, particularly when it is pushed quickly, and fade within minutes; prescribers advise injecting slowly. Chills, shaking or vomiting after a dose are not expected and should be reported to your physician the same day; in October 2024 the FDA warned that food-grade NAD+ powder is not suitable for sterile injections after endotoxin reactions of that kind. Facial or throat swelling, a widespread rash or difficulty breathing needs 911. More is in is NAD+ safe.
For both, the cautions are an active or recent cancer (a 2019 mouse study in Nature Cell Biology reported that the NAD+ recycling pathway drives tumor-promoting secretions of aging cells, so the question is unsettled), significant kidney or liver disease, and pregnancy or breastfeeding.
NMN vs NAD+
Regulation
NMN is sold as a dietary supplement, without a prescription. NAD+ for injection is a prescription medication. It is in Category 1, "Bulk Drug Substances Under Evaluation," on the FDA's 503A list updated 14 May 2026, under which state-licensed pharmacies may compound it while the evaluation continues. It was never in Category 2. Compounded NAD+ is not FDA approved.
NMN vs NAD+
Who suits which
Oral NMN
NMN suits someone who wants the route with the most randomized human evidence for raising blood NAD+, prefers capsules to injections, and is comfortable choosing a supplement without a prescription. It is worth knowing that most of the precursor evidence is for NR rather than NMN, and that the functional effects were small.
NAD+ injection
The injection suits someone who wants NAD+ itself, under a prescription from a physician who has reviewed their history, from a pharmacy accountable for sterility and concentration, and who understands that the evidence for this route is thin. It is also the choice when a physician wants a prescribed product rather than a supplement. The 500 mg strength is described by some prescribers as easier on the injection site for people starting out.
Neither, first
Situation What makes more sense Fatigue you have not had checked The common causes first: low B12, thyroid, iron, sleep apnea, depression Weight or blood sugar is the real goal Semaglutide (from $99/mo) or tirzepatide (from $159/mo), which have large randomized human trials for that B12 deficiency is likely Methylcobalamin; see B12 injections Considering an IV drip instead See NAD+ IV vs injection Bloodwork is not required for any Pepti treatment. If your physician wants labs for your care, they'll ask through your account.
NMN vs NAD+
Where to get NAD+ prescribed
NAD+ injections cannot be bought legitimately without a prescription. Products sold "for research use only" are not accountable for what is in the vial. The prescription route:
- Complete a free online intake covering your history, medications and what you want help with, including any supplements such as NMN or NR.
- A physician licensed in your state reviews it, usually within 24 hours.
- If it is appropriate, a PCAB-accredited, FDA-registered US 503A pharmacy compounds it to that prescription. Lot test results are published at /quality/lab-results.
- It ships refrigerated with your directions printed on the vial, with sterile syringes and alcohol prep pads.
- Your physician stays reachable for questions and dose changes.
Pepti prescribes NAD+ in every state except Oklahoma, plus DC Step by step: how to get NAD+ prescribed online.
References
What this is based on.
References
- Massudi H, Grant R, Braidy N, et al.. Age-associated changes in oxidative stress and NAD+ metabolism in human tissue · PLOS ONE (2012) · PMID 22848760
- Yoshino J, Baur JA, Imai SI. NAD+ Intermediates: The Biology and Therapeutic Potential of NMN and NR · Cell Metabolism (2018) · PMID 29249689
- Verdin E. NAD⁺ in aging, metabolism, and neurodegeneration · Science (2015) · PMID 26785480
- Martens CR, Denman BA, Mazzo MR, et al.. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults · Nature Communications (2018) · PMID 29599478
- Dollerup OL, Christensen B, Svart M, et al.. A randomized placebo-controlled clinical trial of nicotinamide riboside in obese men: safety, insulin-sensitivity, and lipid-mobilizing effects · American Journal of Clinical Nutrition (2018) · PMID 29992272
- Yoshino M, Yoshino J, Kayser BD, et al.. Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women · Science (2021) · PMID 33888596
- Yi L, Maier AB, Tao R, et al.. The efficacy and safety of β-nicotinamide mononucleotide (NMN) supplementation in healthy middle-aged adults: a randomized, multicenter, double-blind, placebo-controlled, parallel-group, dose-dependent clinical trial · GeroScience (2023) · PMID 36482258
- Brakedal B, Dölle C, Riemer F, et al.. The NADPARK study: A randomized phase I trial of nicotinamide riboside supplementation in Parkinson's disease · Cell Metabolism (2022) · PMID 35235774
- McDermott MM, Martens CR, Domanchuk KJ, et al.. Nicotinamide riboside for peripheral artery disease: the NICE randomized clinical trial · Nature Communications (2024) · PMID 38871717
- Shiffman S, Stone AA, Hufford MR. Ecological momentary assessment · Annu Rev Clin Psychol (2008) · PMID 18509902
- Conze D, Brenner C, Kruger CL. Safety and Metabolism of Long-term Administration of NIAGEN (Nicotinamide Riboside Chloride) in a Randomized, Double-Blind, Placebo-controlled Clinical Trial of Healthy Overweight Adults · Scientific Reports (2019) · PMID 31278280
- Nacarelli T, Lau L, Fukumoto T, et al.. NAD+ metabolism governs the proinflammatory senescence-associated secretome · Nature Cell Biology (2019) · PMID 30778219
Citations are provided for educational purposes. They do not constitute medical advice. Always discuss any peptide protocol with your prescribing physician.
Common questions
NMN vs NAD+, answered.
Nobody has compared them head to head. NMN has randomized human trials showing it raises blood NAD+; NAD+ injection has the direct route but no randomized trials. On the 2019 infusion data, injected NAD+ may be broken into fragments including NMN, so the two may work through the same pathway.
NMN is the immediate precursor: the body turns nicotinamide into NMN, then NMN into NAD+. NAD+ is the finished coenzyme cells use for energy metabolism and DNA repair enzymes.
In randomized trials, yes, in blood. A 2023 trial in 80 healthy middle-aged adults reported dose-dependent rises in blood NAD+ over 60 days. Blood is not tissue, and there is no routine clinical test for tissue NAD+.
It depends on what you value: NMN has more human trial evidence and is taken by mouth; NAD+ injection is a prescribed, pharmacy-compounded product that bypasses the gut. Neither has strong evidence for outcomes such as energy or aging. A physician can review your history with you.
No. Both are precursors that enter the same salvage pathway to NAD+. Most of the published precursor trials used NR rather than NMN.
There is no study of the combination. If you take NMN or any supplement, list it on your intake so your physician reviews everything together.
No human trial has tested either against an aging outcome. NAD+ is reported to decline with age in human tissue, and animal work links that decline to sirtuins, but whether raising it changes aging in people is unknown.
The randomized precursor trials, over six weeks to six months, reported no serious adverse events and no recurring adverse-event pattern. The 2023 NMN trial reported no safety issues on laboratory or clinical monitoring.
Mostly stinging at the site and flushing, chest tightness or nausea during the injection that fade within minutes, usually tied to injecting too fast. Chills or vomiting after a dose are not expected and should be reported the same day.
No. Pepti prescribes NAD+ as a compounded injection, at $249 a month (1,000 mg) or $229 a month (500 mg), all-in. It does not supply NMN or NR.
No. NAD+ is in 503A Category 1, under FDA evaluation, and compounded medications are not FDA approved. NMN is sold as a supplement, and supplements are not FDA approved either.
Bloodwork is not required for any Pepti treatment. If your physician wants labs for your care, they'll ask through your account. The free assessment goes to a physician licensed in your state. A consultation does not guarantee a prescription.
Next step
See what a physician recommends for you.
A licensed physician in your state reviews your intake and decides what is appropriate. A consultation does not guarantee a prescription.