This is a working overview of NMN, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-09-23 and is reviewed periodically as new material appears.
Nicotinamide mononucleotide, usually shortened to NMN, is a naturally occurring nucleotide. Its structure consists of a nicotinamide base linked to a ribose sugar that carries a phosphate group. In cells, NMN serves as an intermediate in the salvage pathway that produces nicotinamide adenine dinucleotide, or NAD+. Because NAD+ participates in many oxidation-reduction reactions, NMN sits near central metabolic processes. The compound is not a drug in most jurisdictions and is discussed mainly in biochemistry and nutrition research.
The term NMN commonly refers to the beta isomer, in which the nicotinamide group is attached to the ribose through a beta-glycosidic bond. Commercial material may be supplied as the free acid or as a salt, such as a sodium salt, which affects molecular weight and water solubility. Related compounds include nicotinamide riboside and NAD+ itself, but these are distinct molecules with different formulas and cellular handling. Laboratory research often uses the beta form because it matches the naturally occurring configuration found in biological systems.
Small amounts of NMN occur in some foods, including certain vegetables, fruits, and animal products, though the quantities are generally low and variable. Human cells also synthesize NMN internally from nicotinamide and other precursors. Research interest increased after studies examined whether raising NAD+ levels affects metabolism and aging-related pathways in animals. Evidence in humans remains limited and mixed for many outcomes, and questions about effective absorption, tissue delivery, and long-term effects are still open. Regulatory status differs by country, with some markets treating NMN as a supplement ingredient and others restricting its sale.
Beyond its intracellular synthesis, NMN can be taken up from the extracellular environment, although the routes are still debated. Some evidence points to direct transport into cells through specific transporters, while other work suggests dephosphorylation to nicotinamide riboside followed by cellular uptake. Once inside, NMN can be converted to NAD+ by NMN adenylyltransferases; the relative contribution of these routes may differ by tissue, species, and experimental conditions. Researchers continue to investigate which mechanisms dominate in intact organisms and how they affect measured NAD+ levels. Direct measurement in tissues remains technically challenging because NMN can be rapidly metabolized during sample collection.
NMN occurs in many living systems, including bacteria, yeast, plants, and mammals. Dietary sources are present in foods such as edamame, avocado, broccoli, and various meats, but amounts vary widely and are generally lower than those used in research settings. Laboratory production often relies on enzymatic synthesis or chemical phosphorylation of nicotinamide riboside, and commercial material is typically supplied as a white to off-white powder. Because NMN is hygroscopic and sensitive to heat, moisture, and pH extremes, its handling requires care to preserve identity and purity. Aqueous preparation should be done with attention to pH and temperature to limit hydrolysis.
| Property | Value | Notes |
|---|---|---|
| Chemical name | beta-Nicotinamide mononucleotide | Free acid and salt forms share the core structure. |
| Molecular formula | C11H15N2O8P | Calculated for the free acid; salt forms add counterions. |
| Molar mass | 334.22 g/mol | Approximate value for the free acid form. |
| Appearance | White to off-white powder | Color and texture can vary with purity and salt form. |
| Solubility | Water-soluble | Typically soluble in aqueous media; less soluble in nonpolar solvents. |
Research on NMN has focused on aging, metabolic regulation, exercise capacity, and insulin sensitivity, but findings are preliminary. Many human trials are small, short in duration, and use different endpoints, which complicates comparison across studies. No national regulator has approved NMN as a therapeutic drug for any indication. In some countries it is sold as a supplement or research chemical, while other jurisdictions have questioned its status under food or supplement laws. Claims about extending human lifespan or reversing aging are not supported by established clinical evidence.
Nicotinamide mononucleotide, abbreviated NMN, is a naturally occurring nucleotide found in the cells of many organisms, including bacteria, plants, and mammals. Its structure consists of a nicotinamide ring attached to a ribose-phosphate group. NMN functions as an intermediate in the NAD+ salvage pathway, a recycling route that regenerates nicotinamide adenine dinucleotide. The enzyme nicotinamide phosphoribosyltransferase produces NMN from nicotinamide and phosphoribosyl pyrophosphate. A second enzyme, NMN adenylyltransferase, then converts NMN into NAD+.
Dietary sources of NMN include small amounts in certain vegetables, fruits, and other foods, although exact values vary by sample and method. Endogenous NMN concentrations are tightly regulated and often low, making measurement in blood or tissues technically demanding. After oral intake, NMN is thought to be rapidly metabolized in the intestine and liver, and intact NMN may not reach all tissues at high levels. Some rodent studies report increases in tissue NAD+ after oral NMN, while human data remain limited and sometimes rely on blood NAD+ metabolites rather than direct tissue measures.
NAD+ serves as a coenzyme in redox reactions and as a substrate for enzymes involved in DNA repair and cellular signaling. In the salvage pathway, nicotinamide is converted to NMN by the enzyme NAMPT. NMN is then converted to NAD+ by NMNAT enzymes. A separate route links nicotinamide riboside to NMN through phosphorylation. These pathways maintain NAD+ levels, which can decline with age or metabolic stress in some tissues. The relative contribution of circulating NMN to tissue NAD+ remains an active area of study.
Research on NMN includes cell studies, animal experiments, and a growing number of human trials. Many early findings come from mice, where changes in NAD+ levels and metabolic markers have been reported. Human data are more limited, and questions remain about effective routes of administration, tissue distribution, and long-term effects. Some trials measure NAD+ in blood or tissue, while others assess physical function or metabolic outcomes. Regulatory status differs between countries, and NMN is not universally approved as a dietary supplement or therapeutic agent.
Nicotinamide mononucleotide, abbreviated NMN, is a naturally occurring nucleotide. Its structure combines a nicotinamide base with a ribose sugar and a phosphate group. Within cells, NMN sits on the biosynthetic route that recycles nicotinamide back into nicotinamide adenine dinucleotide, or NAD+. Because NAD+ participates in redox reactions and signaling, enzymes that produce and consume it influence many metabolic processes. The compound is therefore best described as an intermediate rather than a final signaling molecule.
In the canonical salvage pathway, nicotinamide phosphoribosyltransferase, known as NAMPT, transfers a phosphoribosyl group to nicotinamide and releases NMN. A second enzyme, NMN adenylyltransferase, then attaches an adenylyl group to NMN to form NAD+. Alternative routes exist, including a pathway that uses nicotinamide riboside and its phosphorylated forms. The relative contribution of extracellular NMN to intracellular NAD+ pools remains an area of active investigation, and the roles of specific transporters and enzymes are not completely defined.
== Other forms of copper sulfate == Anhydrous copper(II) sulfate can be produced by dehydration of the commonly available pentahydrate copper sulfate. In nature, it is found as the very rare mineral known as chalcocyanite. The pentahydrate also occurs in nature as chalcanthite. Other rare copper sulfate minerals include bonattite (trihydrate), boothite (heptahydrate), and the monohydrate compound poitevinite. There are numerous other, more complex, copper(II) sulfate minerals known, with environmentally important basic copper(II) sulfates like langite and posnjakite.
Cyber crime and hacking services for financial institutions and banks have also been offered over the dark web. Markets such as AlphaBay Market have hosted a significant share of the commercial fraud market, featuring carding, counterfeiting and many related services. Loyalty card information is also sold as it is easy to launder.
== Potential applications == A wide variety of potential applications have been envisaged. Since magnetic nanoparticles are expensive to produce, there is interest in their recycling or for highly specialized applications. The potential and versatility of magnetic chemistry arises from the fast and easy separation of the magnetic nanoparticles, eliminating tedious and costly separation processes usually applied in chemistry. Furthermore, the magnetic nanoparticles can be guided via a magnetic field to the desired location which could, for example, enable pinpoint precision in fighting cancer.
=== Energy drinks === High caffeine consumption in energy drinks (at least one liter or 320 mg of caffeine) was associated with short-term cardiovascular side effects including hypertension, prolonged QT interval, and heart palpitations. These cardiovascular side effects were not seen with smaller amounts of caffeine consumption in energy drinks (less than 200 mg).
Sources: en.wikipedia.org
=== Origins (1992–2004) === Julien Rour Chanut grew up in the Essonne department, south of Paris, in France. Mehdi Birouk Thépegnier, born in Morocco (Maghreb), arrived in France at the age of 12. They met in 1992 at a college in Essonne and became friends. Chanut and Thépegnier were passionate about 1990s hardcore punk, heavy metal and grunge. The hardcore scene consisting of bands such as Confusion, Integrity, Only Living Witness, Section 8, and Sheer Terror, and the do-it-yourself philosophy associated with this culture, motivated them to perform music. Chanut found his path between the ages of 13 and 14 by beginning to play hardcore punk. The two friends first stepped onto the stage at around 15 or 16. They grew up in the hardcore punk scene of the 1990s. Thépegnier was a member of Mouvement Colère (lit. 'Anger Movement') and later a bassist in Drowning, which toured as the opening act for All Out War and Merauder. Over time, Chanut and Thépegnier performed in various local bands, including Arkangel (band), Es La Guerilla and Rising Dust. Clément Hanvic was part of their circle; he was the singer of Knockoutz and the bassist of L'Esprit du Clan (lit. 'The Spirit of the Clan'), and performed with Es La Guerilla. The bassist for Knockoutz and Es La Guerilla was Kéo Nackphouminh. Sid-Ahmed Azzouni was a guitarist in Es La Guerilla. After playing electric bass for a while, Thépegnier switched to drums.
==== Australian Information Commissioner inquiry ==== In December 2023, the Office of the Australian Information Commissioner announced an inquiry into TikTok's data harvesting of Australian citizens amid allegations that it contravened Australian privacy law.
Threonine (symbol Thr or T) is an amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated −NH+3 form when dissolved in water), a carboxyl group (which is in the deprotonated −COO− form when dissolved in water), and a side chain containing a hydroxyl group, making it a polar, uncharged amino acid. It is essential in humans, meaning the body cannot synthesize it: it must be obtained from the diet. Threonine is synthesized from aspartate in bacteria such as E. coli. It is encoded by all the codons starting AC (ACU, ACC, ACA, and ACG). Threonine sidechains are often hydrogen bonded; the most common small motifs formed are based on interactions with serine: ST turns, ST motifs (often at the beginning of alpha helices) and ST staples (usually at the middle of alpha helices).
The Valley Library Special Collections at Oregon State University contain the Ava Helen and Linus Pauling Papers, including digitized versions of Pauling's forty-six research notebooks. In 1986, Caltech commemorated Linus Pauling with a symposium and lectureship. The Pauling Lecture series at Caltech began in 1989 with a lecture by Pauling himself. The Caltech Chemistry Department renamed room 22 of Gates Hall the Linus Pauling Lecture Hall, since Pauling spent so much time there. Other places named after Pauling include Pauling Street in Foothill Ranch, California; Linus Pauling Drive in Hercules, California; Linus and Ava Helen Pauling Hall at Soka University of America in Aliso Viejo, California; Linus Pauling Middle School in Corvallis, Oregon; and Pauling Field, a small airfield located in Condon, Oregon, where Pauling spent his youth. There is a psychedelic rock band in Houston, Texas, named The Linus Pauling Quartet. The asteroid 4674 Pauling in the inner asteroid belt, discovered by Eleanor F. Helin, was named after Linus Pauling in 1991, on his 90th birthday. Linus Torvalds, developer of the Linux kernel, and Linus Sebastian, YouTuber known for the technology-oriented channel Linus Tech Tips, are named after Pauling. Nobel laureate Peter Agre has said that Linus Pauling inspired him. In 2010, Pacific Northwest National Laboratory named its distinguished postdoctoral program in his honor, as the Linus Pauling Distinguished Postdoctoral Fellowship Program.
Nineteen states require a bear hunting license, with some also requiring a big game license. In eight states, only a big game license is required. Overall, over 481,500 American black bear hunting licenses are sold per year. The hunting methods and seasons vary greatly according to state, with some bear hunting seasons including fall only, spring and fall, or year-round. New Jersey, in November 2010, approved a six-day bear-hunting season in early December 2010 to slow the growth of the population. Bear hunting had been banned in New Jersey for five years before that time. A Fairleigh Dickinson University PublicMind poll found that 53% of New Jersey voters approved of the new season if scientists concluded that bears were leaving their usual habitats and destroying private property. Men, older voters and those living in rural areas were more likely to approve of a bear hunting season in New Jersey than women, younger voters and those living in more developed parts of the state. In the western states, where there are large American black bear populations, there are spring and year-round seasons. Approximately 18,000 American black bears were killed annually in the U.S. between 1988 and 1992. Within this period, annual kills ranged from six bears in South Carolina to 2,232 in Maine. According to Dwight Schuh in his Bowhunter's Encyclopedia, American black bears are the third most popular quarry of bowhunters, behind deer and elk.
Sources: en.wikipedia.org
== History == Protein C's anticoagulant role in the human body was first noted by Seegers et al. in 1960, who gave protein C its original name, autoprothrombin II-a. Protein C was first isolated by Johan Stenflo from bovine plasma in 1976, and Stenflo determined it to be a vitamin K-dependent protein. He named it protein C because it was the third protein ("peak C") that eluted from a DEAE-Sepharose ion-exchange chromotograph. Seegers was, at the time, searching for vitamin K-dependent coagulation factors undetected by clotting assays, which measure global clotting function. Soon after this, Seegers recognised Stenflo's discovery was identical with his own. Activated protein C was discovered later that year, and in 1977 it was first recognised that APC inactivates Factor Va. In 1980, Vehar and Davie discovered that APC also inactivates Factor VIIIa, and soon after, Protein S was recognised as a cofactor by Walker. In 1982, a family study by Griffin et al. first associated protein C deficiency with symptoms of venous thrombosis. Homozygous protein C deficiency and the consequent serious health effects were described in 1984 by several scientists. cDNA cloning of protein C was first performed in 1984 by Beckmann et al. which produced a map of the gene responsible for producing protein C in the liver. In 1987 a seminal experiment was performed (Taylor et al.) whereby it was demonstrated that activated protein C prevented coagulopathy and death in baboons infused with lethal concentrations of E. coli. In 1993, a heritable resistance to APC was detected by Dahlbäck et al.
=== Overnutrition === Excessive consumption of energy-dense foods and drinks and limited physical activity causes overnutrition. It causes overweight, defined as a body mass index (BMI) of 25 or more, and can lead to obesity (a BMI of 30 or more). Obesity has become a major health issue worldwide. Overnutrition is linked to chronic non-communicable diseases like diabetes, certain cancers, and cardiovascular diseases. Hence identifying and addressing the immediate risk factors has become a major health priority. The recent evidence on the impact of diet-induced obesity in fathers and mothers around the time of conception is identified to negatively program the health outcomes of multiple generations. According to UNICEF, at least 1 in every 10 children under five is overweight in 33 countries.
Homoserine dehydrogenase catalyzes the reaction of aspartate-semialdehyde (ASA) to homoserine. The overall reaction reduces the C4 carboxylic acid functional group of ASA to a primary alcohol and oxidizes the C1 aldehyde to a carboxylic acid. Residues Glu 208 and Lys 117 are thought to be involved in the active catalytic site of the enzyme. Asp 214 and Lys 223 have been shown to be important for hydride transfer in the catalyzed reaction. Once the C4 carboxylic acid is reduced to an aldehyde and the C1 aldehyde is oxidized to a carboxylic acid, experiments suggest that Asp 219, Glu 208 and a water molecule bind ASA in the active site while Lys 223 donates a proton to the aspartate-semialdehyde C4 oxygen. Homoserine dehydrogenase has an NAD(P)H cofactor, which then donates a hydrogen to the same carbon, effectively reducing the aldehyde to an alcohol. (Refer to figures 1 and 2). However, the precise mechanism of complete homoserine dehydrogenase catalysis remains unknown. The homoserine dehydrogenase-catalyzed reaction has been postulated to proceed through a bi-bi kinetic mechanism, where the NAD(P)H cofactor binds the enzyme first and is the last to dissociate from the enzyme once the reaction is complete. Additionally, while both NADH and NADPH are adequate cofactors for the reaction, NADH is preferred. The Km of the reaction is four-times smaller with NADH and the Kcat/Km is three-times greater, indicating a more efficient reaction. Homoserine dehydrogenase also exhibits multi-order kinetics at subsaturating levels of substrate.
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Sources: en.wikipedia.org
NMN stands for nicotinamide mononucleotide. It is a nucleotide composed of nicotinamide, ribose, and phosphate. In cells, it is an intermediate in NAD+ biosynthesis.
No, NMN and NAD+ are different molecules. NMN is a precursor that cells can convert into NAD+ through enzymatic steps. NAD+ is a larger dinucleotide that serves as a coenzyme in many reactions.
Nicotinamide riboside, or NR, is another NAD+ precursor but has a different structure. NR lacks the phosphate group present in NMN. Both are studied for their roles in NAD+ metabolism, yet they enter cellular pathways in different ways.
NMN is nicotinamide mononucleotide, a nucleotide intermediate in NAD+ biosynthesis. It consists of nicotinamide, ribose, and phosphate groups.