NMN vs NR: Comparing NAD+ Precursors and Where Hydrogen Water Fits

Posted on December 11, 2025

Both supplements in this comparison do what they are sold to do. That is what the human trials agree on most clearly, and it is the least interesting thing about them. Nicotinamide mononucleotide and nicotinamide riboside each raise measurable NAD⁺ in the blood of people who take them, at doses studied against placebo. Everything downstream of that rise is where the picture gets variable.

So the NMN vs NR question is narrower than the marketing around it. Both are precursors. Both feed the same coenzyme. Both work the supply side of mitochondrial energy metabolism — keeping enough NAD⁺ on hand for the reactions that turn food and oxygen into usable energy. Mitochondria have a second side: the redox side, where reactive oxygen species are generated and either handled or not. That side has its own human literature, with molecular hydrogen in the middle of it.

Eric, a holistic athlete in Orlando, spent years reading longevity research before he landed on molecular hydrogen — and he arrived skeptical. "At first I kind of didn't believe the whole hydrogen thing because there's so much misconception and a lot of people trying to profit off of it," he says. Anyone who has spent an afternoon comparing precursor labels knows the feeling.

NMN and NR: Two Doorways Into the Same Coenzyme

What each one actually is

NAD⁺ — nicotinamide adenine dinucleotide — shuttles electrons through the reactions of energy metabolism, and is consumed by enzymes that repair DNA and regulate cellular signaling. Nicotinamide riboside and nicotinamide mononucleotide are both intermediates on the salvage pathway that rebuilds it. NR sits one step earlier; NMN sits one step later, directly adjacent to NAD⁺ itself. That single step is the entire mechanistic basis of the NMN vs NR argument.

We are not re-teaching NAD⁺ decline here — a separate piece covers what the research says about NAD⁺ and cellular energy. What belongs on this page is the trial evidence: who was studied, for how long, and what was measured.

What the NMN Trials Measured

Eighty healthy adults, three doses, sixty days

Yi and colleagues published a randomized, multicenter, double-blind, placebo-controlled, dose-dependent trial in GeroScience in 2022 [1]. Eighty healthy middle-aged adults took placebo or 300, 600, or 900 mg of NMN daily for sixty days. Blood NAD concentrations rose significantly in all three NMN groups at day 30 and day 60, highest at 600 and 900 mg. Six-minute walking distance increased relative to placebo. HOMA-IR, an index of insulin resistance, showed no significant difference. No safety issues were reported, and the authors described it as well tolerated up to 900 mg per day.

Both halves belong in the same breath. The NAD⁺ rise was clear and dose-related; one functional measure moved, one metabolic measure did not.

A ten-week trial with a glucose clamp

Yoshino and colleagues reported in Science in 2021 on a ten-week randomized trial in postmenopausal women with prediabetes who were overweight or obese [2]. Using a hyperinsulinemic-euglycemic clamp — the reference method for measuring insulin action — they reported that insulin-stimulated glucose disposal and skeletal muscle insulin signaling increased after NMN and were unchanged after placebo. That is the study's population, and the finding belongs to it.

What the NR Trials Measured

Crossover in healthy middle-aged and older adults

Martens and colleagues published a two-by-six-week randomized, double-blind, placebo-controlled crossover trial in Nature Communications in 2018 [3]. Their conclusion is admirably plain: NR was well tolerated and effectively stimulated NAD⁺ metabolism in healthy middle-aged and older adults. The paper's blood-pressure and arterial-stiffness observations are ones the authors themselves call initial insight warranting further trials rather than an established effect.

When the blood rise and the tissue rise are different numbers

Brakedal and colleagues ran a randomized phase I trial in Cell Metabolism in 2022 in thirty newly diagnosed, treatment-naive patients, comparing 1,000 mg of NR against placebo for thirty days [4]. NR was well tolerated and produced a significant but variable increase in cerebral NAD⁺. Only the recipients whose brain NAD⁺ actually rose showed altered cerebral metabolism. A rise in the blood does not guarantee a rise in the tissue.

From the Supply Side to the Redox Side

Line those four trials up and an honest through-line appears. NAD⁺ precursors reliably raise measurable NAD⁺ in blood, and that replicates across independent teams, doses, and populations. What the rise does downstream varies by tissue and by person. Not a knock on the category — a description of where a supply-side intervention lands, and why the redox side of the same organelle deserves more than a footnote.

Ohsawa and colleagues opened that line of work in Nature Medicine in 2007, proposing that molecular hydrogen appears to act as a selective antioxidant, preferentially reacting with hydroxyl radicals and peroxynitrite rather than sweeping broadly across all reactive oxygen species [5]. Rat model. A hypothesis still being explored — and the reason an entire human literature exists downstream of it. We unpacked selectivity in a separate article on selective versus non-selective free-radical strategies.

Zhang and colleagues reviewed the mitochondrial case in Frontiers in Cell and Developmental Biology in 2023, describing mitochondria as a primary proposed target for hydrogen's effects — electron transport chain efficiency, ATP production, membrane dynamics [6]. Proposed. Reviews by Fu and colleagues [7] and Rahman and colleagues [8] describe a similar picture, largely preclinical, covering hydroxyl-radical neutralization, peroxynitrite reduction, and activation of the Nrf2 and HO-1 pathways that regulate the body's own antioxidant enzymes.

The Human Trial Where Hydrogen Moved a Mitochondrial Measure

Here is the study that makes the bridge concrete. Sumbalová and colleagues published a trial in the International Journal of Molecular Sciences in 2023 involving thirty patients with non-alcoholic fatty liver disease plus fifteen healthy volunteers, in which seventeen participants drank hydrogen-rich water at more than 4 mg/L, three times 330 mL daily, for eight weeks against placebo [9]. In the hydrogen group the researchers reported that coenzyme Q10 in platelets increased, plasma TBARS — a marker of lipid peroxidation — decreased, and the efficiency of oxidative phosphorylation improved. Changes in the placebo group were not significant.

Platelet mitochondrial function is used in this literature as a readout of systemic mitochondrial health — which is why that trial matters to anyone who arrived here thinking about mitochondria. A human trial. A mitochondrial bioenergetic endpoint. Water you drink.

What Else the Human Hydrogen Trials Have Measured

Fatigue and aerobic capacity, pooled

Zhou and colleagues published a systematic review and meta-analysis in Frontiers in Nutrition in 2023 covering seventeen publications across nineteen studies and 402 participants [10]. Rating of perceived exertion came in at SMD −0.38 and blood lactate at SMD −0.42 (both p = 0.006) — small, significant, and with low heterogeneity. VO₂max and endurance performance were not significant. The authors' own conclusion: moderate evidence that hydrogen alleviates fatigue but does not enhance aerobic capacity in healthy adults.

Antioxidant capacity, and what stayed flat

Li and colleagues pooled six studies and seven experiments across 76 participants in the same journal in 2024 [11]. Hydrogen produced greater improvement in biological antioxidant potential than placebo (SMD = 0.29, p = 0.03), with a larger effect around intermittent exercise. The d-ROMs measure did not change significantly. Zhou and colleagues later ran a randomized, double-blind crossover in eighteen trained men, reporting higher total power output and total repetitions after eight days of intermittent hydrogen-rich water, with no significant difference in countermovement jump, recovery, or soreness scores [12]. Aoki and colleagues, in an early pilot in ten elite soccer players, reported that the rise in blood lactate seen on placebo water did not occur on hydrogen-rich water, and that peak torque held in the early phase of maximal isokinetic knee extension where it fell on placebo — while d-ROMs, BAP, and creatine kinase showed no significant change [13].

Small effects, honestly sized, in randomized and placebo-controlled designs.

Different Levers on the Same Organelle

None of this makes hydrogen a substitute for anything. Precursors raise a coenzyme; molecular hydrogen has been studied against redox and mitochondrial bioenergetic measures. Two levers, one organelle, separate literatures. One difference matters from where a buyer stands: a supplement is a consumable you re-order forever, and a machine is something you own — testable, certified, possible to look up.

That distinction is what ended Eric's skepticism. What settled it was the engineering rather than a marketing claim: separate-chamber electrolysis that keeps the drinking water off the electrodes, the purity of the hydrogen output, nano-bubble technology, Japanese manufacturing. His routine is fifteen to twenty minutes of hydrogen gas inhalation before bed and about a liter of hydrogen-rich water — simple, quiet, easy to keep. His advice: do the research, look at the engineering, don't settle.

Paula arrived from the other direction. She is 92, lives in a California senior living community, and has been drinking a liter of hydrogen-rich water every day since March 2024 — because her daughter Pamela did the reading first. "I started researching more," Pamela says, "and I got more and more excited the more I learned." What drew her in was the Japanese engineering, the separate-chamber design, and a reputation for purity.

Common Questions About NMN, NR, and Hydrogen Water

Do NMN and NR actually raise NAD+ in humans?

Yes, and it is the most consistent result in this literature. Yi and colleagues reported significant increases in blood NAD concentrations across 300, 600, and 900 mg daily doses of NMN over sixty days in eighty healthy middle-aged adults, and Martens and colleagues reported that nicotinamide riboside effectively stimulated NAD⁺ metabolism in healthy middle-aged and older adults across a six-week crossover. What varies is what follows the rise — Brakedal and colleagues found the tissue-level increase significant but variable between individuals.

Is hydrogen water a replacement for an NAD+ precursor?

No, and framing it that way misreads both literatures. Precursors have been studied against NAD⁺ availability. Molecular hydrogen has been studied against redox and mitochondrial bioenergetic measures — Sumbalová and colleagues reported increased platelet coenzyme Q10, decreased plasma TBARS, and improved oxidative phosphorylation efficiency in the group drinking hydrogen-rich water. Different measurements, different mechanisms, no head-to-head trial between them.

How much hydrogen water do people typically drink?

Most owners aim for roughly two liters a day, and the common habit is two big glasses first thing in the morning before eating. The published trials cluster in a similar range — the Sumbalová trial used three servings of 330 mL daily for eight weeks. It is a habit, not a schedule.

What a Daily Hydrogen Habit Asks of the Machine

The certificates you can look up

A daily habit asks three things of a device: enough dissolved hydrogen to sit in the range the published trials worked in, water clean enough that you are drinking hydrogen and nothing else, and an operation simple enough that you never think about it. Given these criteria, here is how the Lourdes Hydrofix Premium Edition is built. Separate-chamber (dual-chamber) electrolysis around a multi-layer fibriform polymer membrane, with solid high-purity titanium and platinum electrodes. It is designed to reach up to approximately 1.6 ppm dissolved hydrogen under normal conditions and approximately 120 mL/min of hydrogen gas, depending on usage conditions. pH neutral, within ±0.1 of the source water. Made in Japan.

You can find the Lourdes Hydrofix in our best hydrogen water generator collection.

Japan Food Research Laboratories tested the water this machine produces and reported selected plasticizers, BPA, iron, and titanium not detected under test conditions (Certificate No. 23028707001-0201). Eight substances, eight "not detected" — publishing that certificate rather than summarizing it was a deliberate editorial decision. The electrode material is TP270C titanium at 99.928% purity per an independent metallurgical certificate (No. 17-MANS-0078-B). Masa International Corp., a third-party testing lab, measured hydrogen gas output at approximately 134.2 mL/min under test conditions (Test No. MM03-6024-01) — we advertise 120. Those documents sit on our certifications page.

Concentration matters. Purity matters at least as much — what is in your water besides hydrogen is the other half of the question, and the half most of this category never publishes. Eric's trust was reinforced by exactly that: lab-certified purity and third-party testing by Japan Food Research Laboratories. There is a separate piece on what independent testing does and does not tell you about a machine.

Every unit is tested for hydrogen concentration before it leaves the factory and ships with an individual certificate of authenticity showing that machine's own result. Pamela's reason for staying is the plainest endorsement in our files: no complicated protocols, just hydrogen-rich water from a machine she trusts. The evening delivery became a ritual, and Paula, who at 92 still attends exercise classes and plays competitive card games, now asks the same question most nights: are you coming to bring my water tonight?

Fill it, run it, drink it. Paula calls it her special water. If you came here comparing precursors and leave curious about the redox side of the same mitochondria, the Lourdes Hydrofix is the machine we build everything around.

Holy Hydrogen products, including the Lourdes Hydrofix Premium Edition, are not medical devices and are not intended to diagnose, treat, cure, or prevent any disease. All information on this site is provided for educational and general wellness purposes only and should not be considered medical advice. Always consult a qualified healthcare provider before beginning any new wellness practice, especially if you have a medical condition, are pregnant or nursing, or take prescription medications.

References

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. 2022;45(1):29–43. PMID: 36482258 · PMC9735188
Yoshino M, Yoshino J, Kayser BD, et al. "Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women." Science. 2021;372(6547):1224–1229. PMID: 33888596 · PMC8550608
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;9(1):1286. PMID: 29599478 · PMC5876407
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;34(3):396–407.e6. PMID: 35235774 · DOI: 10.1016/j.cmet.2022.02.001
Ohsawa I, Ishikawa M, Takahashi K, et al. "Hydrogen acts as a therapeutic antioxidant by selectively reducing cytotoxic oxygen radicals." Nature Medicine. 2007;13(6):688–694. PMID: 17486089 · DOI: 10.1038/nm1577
Zhang X, Xie F, Ma S, et al. "Mitochondria: one of the vital hubs for molecular hydrogen's biological functions." Frontiers in Cell and Developmental Biology. 2023;11:1283820. PMID: 38020926 · PMC10662307
Fu Z, Zhang J, Zhang Y. "Role of molecular hydrogen in ageing and ageing-related diseases." Oxidative Medicine and Cellular Longevity. 2022;2022:2249749. PMID: 35340218 · PMC8956398
Rahman MH, Jeong ES, You HS, et al. "Redox-mechanisms of molecular hydrogen promote healthful longevity." Antioxidants. 2023;12(5):988. PMID: 37237854 · PMC10215238
Sumbalová Z, Kucharská J, Rausová Z, et al. "The effect of adjuvant therapy with molecular hydrogen on endogenous coenzyme Q10 levels and platelet mitochondrial bioenergetics in patients with non-alcoholic fatty liver disease." International Journal of Molecular Sciences. 2023;24(15):12477. PMID: 37569850 · PMC10419858
Zhou K, Liu M, Wang Y, et al. "Effects of molecular hydrogen supplementation on fatigue and aerobic capacity in healthy adults: a systematic review and meta-analysis." Frontiers in Nutrition. 2023;10:1094767. PMID: 36819697 · PMC9934906
Li Y, Bing R, Liu M, et al. "Can molecular hydrogen supplementation reduce exercise-induced oxidative stress in healthy adults? A systematic review and meta-analysis." Frontiers in Nutrition. 2024;11:1328705. PMID: 38590828 · PMC10999621
Zhou K, Yuan C, Shang Z, et al. "Effects of 8 days intake of hydrogen-rich water on muscular endurance performance and fatigue recovery during resistance training." Frontiers in Physiology. 2024;15:1458882. PMID: 39434721 · PMC11491356
Aoki K, Nakao A, Adachi T, et al. "Pilot study: effects of drinking hydrogen-rich water on muscle fatigue caused by acute exercise in elite athletes." Medical Gas Research. 2012;2:12. PMID: 22520831 · PMC3395574

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