NMNAT is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2025-11-23. Where a claim depends on a specific study, the study is described rather than over-claimed.
Quality control for NMN typically checks identity, assay purity, residual solvents, heavy metals, and microbial limits, depending on the intended use and market. A certificate of analysis may report appearance, solubility, water content, and storage recommendations. Independent verification can compare chromatographic retention time and mass spectrum against a certified reference standard. Regulatory expectations differ between research chemicals, dietary ingredients, and pharmaceutical products. Impurity profiles and stability data are often requested for product approval, and open questions remain about how best to standardize NMN measurements across laboratories.
NMN is a polar, water-soluble nucleotide. In solid form it is usually a white to off-white powder. The compound is sensitive to heat, light, moisture, and extremes of pH, and aqueous solutions tend to degrade faster than dry material. Recommended storage for research samples is typically -20 °C or below in a sealed, desiccated container protected from light. Repeated freeze-thaw cycles should be avoided, and these handling practices help maintain identity and purity during laboratory use.
Research on NMN has expanded because NAD+ concentrations decline with age in some tissues and because NAD+ participates in energy metabolism, DNA repair, and signaling. Animal studies have reported changes in NAD+ levels after NMN administration, but human data are more limited and often focus on safety, pharmacokinetics, and biomarker changes. Questions remain about oral absorption, tissue distribution, and whether changes in blood NAD+ reflect changes inside specific organs. NMN is not an approved drug, and claims about its clinical effects should be distinguished from established biochemical findings.
Nicotinamide mononucleotide, abbreviated NMN, is a naturally occurring nucleotide. Its structure combines a nicotinamide ring, a ribose sugar, and a phosphate group. The compound exists in cells as an intermediate in the production of nicotinamide adenine dinucleotide, a central redox cofactor. NMN is distinct from nicotinamide riboside, another related pyridine nucleotide, although the two compounds can converge in metabolic pathways. Its chemical formula is C11H15N2O8P, and it carries a net negative charge at physiological pH.
In the salvage pathway, NMN is generated from nicotinamide and 5-phosphoribosyl-1-pyrophosphate by the enzyme nicotinamide phosphoribosyltransferase. A second route produces NMN from nicotinamide riboside through phosphorylation by nicotinamide riboside kinases. NMN is then converted to NAD+ by nicotinamide mononucleotide adenylyltransferases, often called NMNAT enzymes. This stepwise route allows cells to recycle nicotinamide and maintain NAD+ levels under changing metabolic conditions. The relative contribution of each route varies by tissue, species, and physiological state, and it remains an active area of research.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Typical for solid free acid or salt forms |
| Solubility | Freely soluble in water | Polar nucleotide; limited solubility in nonpolar solvents |
| Typical storage | -20 °C or below | Desiccated, protected from light |
| Common analytical method | LC-MS or HPLC-UV | Used for identity and purity assessment |
| Common synonyms | Nicotinamide ribonucleotide; beta-NMN | NMN is the usual abbreviation |
Simon Khung, a social media influencer who eventually stopped taking drugs after the 2020 murder of his daughter Megan Khung (who was allegedly killed by her mother), told a newspaper in 2024 that he supported the death penalty for drug trafficking, as he felt that the drug situation in Singapore would grow worse in the absence of capital punishment and more people would become drug abusers and ruin their lives like he and the former abusers had in their pasts; Khung's stance was supported by other ex-abusers, and one of them, Bruce Mathieu (who overcame his drug addiction seven years prior), said that the death penalty had deterred him from resorting to drug smuggling. In the aftermath of several executions, there were discussions among the Singaporean public about the need for compassion for some death row inmates, owing to arguments that many death row inmates had come from low-income families or had drug addictions before ending up on death row. However, the public sentiments remained leaning towards capital punishment for drugs, owing to arguments concerning rampant rates of drug trafficking in the Golden Triangle in Southeast Asia, the effectiveness of the death penalty in maintaining Singapore's low crime rate, and the impact drugs have had on the addicts and their families. When 31-year-old Singaporean Shen Hanjie was sentenced to death for trafficking 34.94g of pure heroin in October 2022, a huge majority of the netizens showed support for the death sentence in Shen's case, with some expressing sympathy for his family, especially his parents.
Megakaryocyte and platelet production is regulated by thrombopoietin, a hormone produced in the kidneys and liver. Each megakaryocyte produces between 1,000 and 3,000 platelets during its lifetime. An average of 1011 platelets are produced daily in a healthy adult. Reserve platelets are stored in the spleen and are released when needed by splenic contraction induced by the sympathetic nervous system.
While the exact end date of the Cold War is debated among historians, it is generally agreed upon that the implementation of nuclear and conventional arms control agreements, the withdrawal of Soviet military forces from Afghanistan and Eastern Europe, and the resultant collapse of the Soviet Union marked the end of the Cold War. Scholars remain divided over the underlying causes, with materialist accounts emphasizing Soviet economic decline and ideational accounts stressing the personal worldviews of Gorbachev and Reagan coupled with the broader appeal of the Western European model.
Candidates were asked to give yes or no responses to whether or not January 6 was an "inside job" and whether or not the 2020 election was "stolen". Those that did not say yes to both answers were not hired.
=== Dorsal genital slits in some African tribes === A variety of "dorsal slit" circumcision was once predominant amongst the Maasai tribe of Kenya and Tanzania, and is still practised and found in many of the more remote regions of the very large area known as "Maasailand" generally. However, the Maasai operation is different in this: rather than a dorsal slit from the opening of the prepuce to the corona, a heart shaped "oval" is excised from the dorsum of the prepuce and the glans is pushed through this hole. Later the edges of the cut prepuce will heal. The prepuce is first cut off, leaving only a small part where the main veins are located, which is pulled down and the small hole through which the glans in pushed through is created. The remaining part is left hanging down, but the glans exposed. Formerly tribes that copied the Maasai like the numerous Kikuyu, Embu and Meru of Kenya also practised the same form of circumcision. Photos of the operation and result are numerously found in specialized African books, such as Carol Beckwith and Tepelit Ole Saitoti's Maasai. There are words for the resultant "preputial flap" in the Maa and Gikuyu languages, and possibly in other African tongues. In Gikuyu the word, now archaic, is likely to be ngwati.
Sources: en.wikipedia.org
The H+ gradient can be eliminated either with H+ ionophores (protonophores) such as nigericin or monensin or by inhibiting the V-ATPase that generates the H+ gradient with compounds such as bafilomycin A1 or concanamycin.
Because these two ions are at the end of Hofmeister series, ammonium sulfate can also stabilize a protein structure. The ammonium sulfate solubility behavior for a protein is usually expressed as a function of the percentage of saturation. A solubility curve can be determined by plotting the log of the experimentally determined solubility, expressed as mg/mL, versus the percentage saturation of ammonium sulfate. With the mechanism of salting-out, there is an omission of the salt from the layer of water, which is closely associated with the surface of the protein, known as the hydration layer. The hydration layer plays a vital role in sustaining solubility and suitable natural conformation. There are three main protein-water interaction: ion hydration between charged side chains, hydrogen bonding between polar groups and water, and hydrophobic hydration. Once salt is added to the mixture, there is an increase in the surface tension of the water, thus increasing hydrophobic interactions between water and the protein of interest. The protein of interest then reduces its surface area, which diminishes its contact with the solvent. This is shown by the folding and self-association, which ultimately leads to precipitation. The folding and self-association of the protein pushes out free water, leading to an increase in entropy and making this process energetically favorable.
==== Chemotaxis ==== Chemotaxis is the ability to direct movement through sensing a gradient of chemoattractants or chemorepellents using flagella, allowing bacteria to locate algal cells to lyse. Some algal cells can have intrinsic attractant properties, whereas others produce attractants. A common chemoattractant is dimethylsulfoniopropionate (DMSP). Additionally, chemotaxis allows for preferential "predation", as some organisms may prefer specific attractants. For instance, amino acids tend to be preferentially taken up by Polaribacter marinivivus and Lentibacter algarum, whereas nucleotides are preferentially taken up by Litoricola marina.
10 October – The Scottish Government shelves plans for the early release of long term prisoners following concerns raised by victims groups, but will reduce the automatic early release for short term prisoners from the point of 50% completion of their sentence to 40%. 11 October – It is reported that Education Secretary Jenny Gilruth has withheld £145.5m in funding to all councils because of a disagreement over cuts to the number of teachers. 12 October – Alex Salmond, former first minister of Scotland, dies aged 69 in North Macedonia. 13 October – Flags are lowered to half-mast at the Scottish Parliament following the death of former First Minister Alex Salmond the previous day. MSP John Mason is expelled from the SNP after posting on Twitter that there was "no genocide" in Gaza. 14 October – The Scottish Government confirms that ferry fares in Scotland will increase by 10% from 1 January 2025. Glasgow City Council unveils plans to make improvements to the city centre, with the changes scheduled to begin in 2025. 16 October – Following trial and conviction at the High Court in Edinburgh, Jamie Boulton is sentenced to life imprisonment with at least 18 years in custody for the stabbing murder of Gary O'Neill at a flat in Leith in June 2023. 17 October – BBC One programme Crimewatch Live makes a fresh appeal for information leading to the discovery of the remains of Suzanne Pilley, who was murdered by her ex-partner in 2010.
=== Physical properties === Adipose tissue has a density of ~0.9 g/ml. Thus, a person with more adipose tissue will float more easily than a person of the same weight with more muscular tissue, since muscular tissue has a density of 1.06 g/ml.
Sources: en.wikipedia.org
The first reliably documented report of Psilocybe semilanceata intoxication involved a British family in 1799, who prepared a meal with mushrooms they had picked in London's Green Park. According to the chemist Augustus Everard Brande, the father and his four children experienced typical symptoms associated with ingestion, including pupil dilation, spontaneous laughter and delirium. The identification of the species responsible was made possible by James Sowerby's 1803 book Coloured Figures of English Fungi or Mushrooms, which included a description of the fungus, then known as Agaricus glutinosus (originally described by Moses Ashley Curtis in 1780). According to German mycologist Jochen Gartz, the description of the species is "fully compatible with current knowledge about Psilocybe semilanceata." In the early 1960s, the Swiss scientist Albert Hofmann—known for the synthesis of the psychedelic drug LSD—chemically analyzed P. semilanceata fruit bodies collected in Switzerland and France by the botanist Roger Heim. Using the technique of paper chromatography, Hofmann confirmed the presence of 0.25% (by weight) psilocybin in dried samples. Their 1963 publication was the first report of psilocybin in a European mushroom species; previously, it had been known only in Psilocybe species native to Mexico, Asia and North America. This finding was confirmed in the late 1960s with specimens from Scotland and England, Czechoslovakia (1973), Germany (1977), Norway (1978), and Belgium and Finland (1984).
=== Malaria === A number of different proteins on the surface of Plasmodium falciparum malaria parasites help the invaders bind to red blood cells. But once attached to host blood cells, the parasites need to shed the 'sticky' surface proteins that would otherwise interfere with entrance into the cell. The Sheddase enzyme, specifically called PfSUB2 in this example, is required for the parasites to invade cells; without it, the parasites die. The sheddase is stored in and released from cellular compartments near the tip of the parasite, according to the study. Once on the surface, the enzyme attaches to a motor that shuttles it from front to back, liberating the sticky surface proteins. With these proteins removed, the parasite gains entrance into a red blood cell. The entire invasion lasts about 30 seconds and without this ADAM metallopeptidase, malaria would be ineffective at invading the red blood cells.
It is a hard technique, which tends to break down large molecule ions during flight, since large molecules are particularly easy to fragment. Furthermore, large molecules are hard to volatilize without being degraded by heat.
== Medical implications == By culturing P. fluorescens, mupirocin (an antibiotic) can be produced, which has been found to be useful in treating skin, ear, and eye disorders. Mupirocin free acid and its salts and esters are agents currently used in creams, ointments, and sprays as a treatment of methicillin-resistant Staphylococcus aureus infection. Pseudomonas fluorescens demonstrates hemolytic activity, and as a result, has been known to infect blood transfusions. Pseudomonas fluorescens produces the antibiotic obafluorin. Recent case studies have reported instances of pneumonia caused by Pseudomonas fluorescens. These studies are significant as they identify P. fluorescens from lung biopsy specimens, providing insights into its pathogenic potential and informing treatment strategies based on antibiotic susceptibility testing. Ongoing research into the antimicrobial resistance mechanisms of the Pseudomonas fluorescens complex is exploring both intrinsic and acquired resistance to antimicrobial agents in strains isolated from various environments. This research is crucial for understanding the evolution of antimicrobial resistance and the role of P. fluorescens as a potential reservoir of clinically important resistance genes. Pseudomonas fluorescens is being studied for its biotechnological applications, particularly in the production of medium-chain-length polyhydroxyalkanoates (MCL-PHAs). These biodegradable polymers have potential uses in medical devices and drug delivery systems.
=== Death === Sunny remained in a persistent vegetative state until her death from cardiopulmonary arrest on December 6, 2008, at Mary Manning Walsh Nursing Home in New York City. Her memorial service, given by her three children, was held on January 14, 2009, at the Brick Presbyterian Church in New York, which was the same church where the von Bülows married.
Sources: en.wikipedia.org
Solid NMN is generally stored in a sealed container at -20 °C or below, protected from light and moisture. Some suppliers recommend a desiccant and inert gas. Aqueous solutions are less stable and are often prepared fresh.
Liquid chromatography-mass spectrometry and nuclear magnetic resonance spectroscopy are common identity tests. HPLC with ultraviolet detection can assess purity by peak area. Results are usually compared with a certified reference standard.
Degradation can reduce the amount of intact NMN and create related impurities. Storage conditions and handling therefore affect measured purity and experimental reproducibility. Stability data also inform labeling and shelf-life claims.
NMN stands for nicotinamide mononucleotide. It is a naturally occurring nucleotide and an intermediate in the cellular production of NAD+.