The short version of NAD+ salvage fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-07-07. Anything still debated is marked as such rather than presented as settled.
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.
Nicotinamide mononucleotide, abbreviated NMN, is a naturally occurring nucleotide found in cells. Its structure consists of a nicotinamide ring linked to ribose phosphate, and the compound serves as an intermediate in the salvage pathway for nicotinamide adenine dinucleotide, or NAD+. In this pathway, nicotinamide phosphoribosyltransferase converts nicotinamide and phosphoribosyl pyrophosphate into NMN, after which NMN adenylyltransferase attaches an adenylate group to produce NAD+. Because NAD+ participates in redox reactions and signaling, NMN occupies a central position in cellular metabolism. The molecule is distinct from nicotinamide riboside, though the two are related in NAD+ precursor research.
Quality control for NMN samples often includes purity determination by HPLC, identity confirmation by mass spectrometry or NMR, and water content measurement by Karl Fischer titration. Certificates of analysis may report residual solvents, heavy metals, and microbial limits depending on the intended use. Purity values are method-dependent, so a stated percentage should be interpreted alongside the analytical procedure and detection wavelength. Reference standards help ensure that retention times and spectral data are comparable across laboratories. Researchers increasingly request independent verification because supply chains for specialty chemicals can vary in documentation.
Common laboratory methods for NMN include high-performance liquid chromatography with ultraviolet detection, liquid chromatography coupled to mass spectrometry, and nuclear magnetic resonance spectroscopy. Because the nicotinamide ring absorbs ultraviolet light, HPLC-UV at wavelengths near 260 nm can be used for purity assessment. LC-MS and LC-MS/MS provide greater sensitivity and are often applied to biological samples. Identification typically relies on matching retention time, mass-to-charge ratio, and fragmentation pattern to a reference standard.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C11H15N2O8P | Neutral form; often supplied as a salt or hydrate. |
| Molecular weight | 334.22 g/mol | Calculated for C11H15N2O8P. |
| Appearance | White to off-white powder | Color can vary with purity and hydration. |
| Solubility | Soluble in water | Aqueous solutions are acidic and stability depends on pH and temperature. |
| Typical storage | −20 °C or below, desiccated | Protect from light; avoid repeated freeze-thaw cycles. |
Inside cells, the enzyme nicotinamide phosphoribosyltransferase, or NAMPT, converts nicotinamide and a ribose-phosphate donor into NMN. A second enzyme, NMN adenylyltransferase, then converts NMN into NAD+. NAD+ participates in redox reactions and serves as a substrate for signaling enzymes such as sirtuins, PARPs, and CD38. Because NAD+ levels tend to decline with age in many organisms, NMN has drawn interest as a possible way to influence that decline. Whether oral NMN reliably raises NAD+ in human tissues, and whether any such change modifies disease risk, remain open research questions.
NMN is present in small amounts in some foods, including certain vegetables, fruits, and animal products, but food content varies widely and is not well standardized. In laboratory research, NMN is used as a tool compound to study NAD+ metabolism, mitochondrial function, and cellular stress responses. Animal studies have reported changes in NAD+ levels and various physiological measures after NMN administration, but species differences and study designs limit direct extrapolation to humans. Human trials have largely focused on safety, tolerability, and pharmacokinetics, with fewer studies examining clinical endpoints.
Nicotinamide mononucleotide is usually handled as a dry powder because moisture can promote hydrolysis and shorten shelf life. Recommended storage conditions often include a desiccated container at minus twenty degrees Celsius or colder, with protection from light. Aqueous solutions are less stable than solid material and may degrade faster at ambient temperature or neutral pH. Repeated freeze-thaw cycles can introduce variability, so aliquoting is common in laboratory settings. These practices reflect general nucleotide chemistry rather than a single universal protocol.
Analytical laboratories identify and quantify NMN using several complementary techniques. High-performance liquid chromatography with ultraviolet detection is widely used for purity and assay work. Liquid chromatography coupled to mass spectrometry provides greater sensitivity and is common for biological matrices. Nuclear magnetic resonance spectroscopy supports structural confirmation and can distinguish related nucleotides. Accurate measurement depends on reference standards, validated methods, and careful sample preparation, especially because NMN can convert to related compounds under some conditions.
Nicotinamide mononucleotide, abbreviated NMN, is a nucleotide composed of nicotinamide, ribose, and phosphate. Its structure links nicotinamide to D-ribose 5-phosphate through a glycosidic bond, placing it in the pyridine nucleotide family. The compound exists in alpha and beta anomeric forms, and the beta form is the one used in NAD+ biosynthesis. NMN is not a protein or a hormone; it is a small water-soluble molecule that occurs in living cells as a metabolic intermediate.
Natural sources of NMN include mammals, plants, and microorganisms, where it functions as an intermediate in NAD+ salvage and biosynthesis pathways. In mammals, the enzyme nicotinamide phosphoribosyltransferase produces NMN from nicotinamide and phosphoribosyl pyrophosphate. NMN is then converted to NAD+ by nicotinamide mononucleotide adenylyltransferase. Some foods contain measurable NMN, but reported amounts vary widely by species, tissue, and analytical method. The extent to which dietary NMN contributes to cellular NAD+ pools remains an open research question.
Chemically, NMN is described by the molecular formula C11H15N2O8P and a molecular mass near 334.22 g/mol. The beta anomer has a CAS Registry Number of 1094-61-7. It is typically supplied as a white to off-white powder for laboratory use. The molecule carries a phosphate group and a positively charged nicotinamide ring, giving it polar and water-soluble character. These properties influence how it is detected, purified, and stored in research and analytical laboratories.
Laboratory identification of NMN usually relies on chromatographic separation coupled with ultraviolet or mass spectrometric detection. High-performance liquid chromatography with UV absorbance can quantify the compound against a reference standard, while liquid chromatography-tandem mass spectrometry offers lower detection limits and better specificity in complex matrices. Nuclear magnetic resonance spectroscopy can confirm structural identity and isomeric form. Ion chromatography or capillary electrophoresis may be used to identify counterions such as sodium. Method validation includes accuracy, precision, linearity, and limits of detection.
Stability testing examines how temperature, humidity, light, and pH affect NMN over time. The compound is generally stored cold, often at minus twenty degrees Celsius or lower, in a desiccated container protected from light. Aqueous solutions tend to be less stable than dry powder because hydrolysis and dephosphorylation can occur, potentially forming nicotinamide riboside or other degradation products. Stress studies may expose samples to heat, acid, base, oxidation, and strong light to identify likely degradation pathways. Results from such studies help define shelf life and handling recommendations, though exact stability depends on formulation and packaging.
The large spectrum of cancer phenotypes due to mutations in the TP53 gene is also supported by the fact that different isoforms of p53 proteins have different cellular mechanisms for prevention against cancer. Mutations in TP53 can give rise to different isoforms, preventing their overall functionality in different cellular mechanisms and thereby extending the cancer phenotype from mild to severe. Recent studies show that p53 isoforms are differentially expressed in different human tissues, and the loss-of-function or gain-of-function mutations within the isoforms can cause tissue-specific cancer or provide cancer stem cell potential in different tissues. TP53 mutation also hits energy metabolism and increases glycolysis in breast cancer cells.
== Indications/Symptoms == Typical symptoms after being bitten by a black mamba include the rapid onset of dizziness, drowsiness and coughing and having difficulties breathing. Other likely symptoms include convulsions, neuromuscular symptoms, shock, loss of consciousness, hypotension, ataxia, excessive salivation, limb paralysis, nausea and vomiting, fever, and severe abdominal pain. Permanent limb paralysis is very likely if the bite remains untreated. In the most severe case, if untreated, the bite of the black mamba can lead to death by suffocation, resulting from the paralysis of respiratory muscles. All these symptoms are due to a combination of all the toxic peptides the crude venom of the black mamba contains. The symptoms are related to calciseptine because it also works as a smooth muscle relaxant, thus explaining the early onset of having difficulties breathing, limb paralysis and even death by suffocation. Calciseptine is known to have a hypotensive effect. It cannot clearly be established which peptide is most responsible for which symptom, since combinations of different toxins can have various effects.
Four people were killed and twelve others were injured in overnight Russian drone strikes on Kharkiv. Another person was killed in a separate attack outside the city. Two people were killed in an airstrike in New York, Donetsk Oblast. The Institute for the Study of War (ISW) assessed that Russian forces had reached the eastern suburbs of Chasiv Yar but were held back by Ukrainian forces. Russia claimed to have shot down 13 drones over Belgorod, Kursk and Tula Oblasts. Ukraine gave certificates of gratitude to a multinational group of "vigilante hackers" known as One Fist responsible for launching cyberattacks on Russian military firms and CCTV cameras "dozens of times". The FSB announced the capture of a former Israeli Defence Force soldier who was trying to join the Ukrainian army. He was given a formal warning and deported back to Israel. A Ukrainian court sentenced a suspect in the 2023 Kramatorsk restaurant missile strike to life imprisonment for aiding Russian forces in the attack. Moldovan Border Police found the wreckage of a Russian drone near Etulia, at about 500 metres (1,600 feet) from the Moldova–Ukraine border.
== Research == Eberlin developed a pen-like device, called the "MasSpec Pen" or "The Cancer Pen", that has demonstrated the capability to detect cancerous tissue by delivering a discrete water droplet to extract biomolecules from the tissue's surface and transporting them to a mass spectrometer for molecular analysis. The pen allows surgeons to achieve a better understanding of which tissues should be removed. As a co-principal investigator at the University of Texas at Austin, Eberlin has developed a method to detect thyroid cancer using Desorption electrospray ionization mass spectrometry (DESI-MS) imaging of fine-needle aspiration biopsies. It is two-thirds more accurate than the test already in use, fine-needle aspiration, which yields more indeterminate results when used in isolation. In addition to her work on cancer diagnosis, Eberlin has also worked with Cooks and her father on the use of mass spectrometry to quickly detect counterfeit money. Eberlin is concerned about the representation of women and diversity in science. In interviews, she has stressed the importance of women in higher levels of academia as well as leadership.
In the same month, France, the United States and Russia scheduled high-level, multi-country diplomatic visits in Africa. Reporting on these trips, Associated Press quoted William Gumede of Democracy Works saying "It’s like a new Cold War is playing out in Africa, where the rival sides are trying to gain influence" used the term "new Cold War"; AP commented "some say is the most intense competition for influence [in Africa] since the Cold War". An editorial by Christian Breuer said "It is conceivable that we see the rebirth of a new era of conflict, the end of the late 20th century unipolar international security architecture under the hegemony of the United States, the end of globalisation and the beginning of a new cold war between the West and the East." In August 2022, an analysis by journalist Anshel Pfeffer in Haaretz used the term to refer to the US's "open confrontation with Russia and China", concluding that "in the new Cold War, [Israel] cannot allow itself to be neutral". In the same month, Katrina vanden Heuvel cautioned against what she perceived as a "reflexive bipartisan embrace of a new Cold War" against Russia and China among US politicians. In September 2022, Greek civil engineer and politician Anna Diamantopoulou stated that, despite unity of NATO members, "the West has lost much of its normative power", citing her "meetings with politicians from Africa, Latin America, and the Middle East". She further stated that the West will risk losing "a new cold war" unless it overcomes challenges that would give Russia and China a greater world advantage.
Sources: en.wikipedia.org
=== Hank Rizzoli === Hank Rizzoli (Ray Romano) is a photographer who is hired by the Braverman family for a family picture in season four. Sarah ultimately becomes Hank's assistant. While at first he disliked Sarah, the two begin a relationship that has problems as Sarah still has feelings for Mark Cyr. In season five, Hank begins a mentor-mentee relationship with Max and teaches him about photography. After spending time with Max, and reading a book about Asperger syndrome that Adam lent him (after one of Max's outbursts), Hank begins to realize that he shares many social qualities with Max and that he may have Asperger syndrome himself. Hank has a daughter, Ruby, from his previous marriage. When Amber is upset because Ryan York, her ex-fiancé, is involved in an accident, Hank offers to drive Amber the long distance to see Ryan. In season six, after Sarah and Hank move in together, Hank begins to bond with Amber and Drew. He helps Amber assemble her crib and asks Drew to be his best man. Hank and Sarah marry in the series finale.
Periodic acid-Schiff (PAS) and immunohistochemical staining may also be used for diagnosis. Currently, there is no cure for Urbach–Wiethe disease, although there are ways to individually treat many of its symptoms. The discovery of the mutations of the ECM1 gene has opened the possibility of gene therapy or a recombinant ECM1 protein for Urbach–Wiethe disease treatment, but neither of these options are currently available. Some researchers are examining patients with Urbach–Wiethe disease to learn more about other conditions that exhibit similar neurological symptoms, such as autism.
== As lipid-modifying medication == Prescription nicotinic acid, commonly labeled as niacin in the United States, is available in immediate-release and slow-release formulations. It is used to treat primary hyperlipidemia and hypertriglyceridemia. It is used either as a monotherapy or in combination with other lipid-modifying drugs. Dosages start at 500 mg/day and are often gradually increased to as high as 3000 mg/day for immediate release or 2000 mg/day for slow release (also referred to as sustained release) to achieve the targeted lipid changes (lower LDL-C and triglycerides, and higher HDL-C). Prescriptions in the US peaked in 2009, at 9.4 million and had declined to 800 thousand by 2020. In 2023, it was the 288th most commonly prescribed medication in the United States, with more than 500,000 prescriptions. Systematic reviews found no effect of prescription nicotinic acid on all-cause mortality, cardiovascular mortality, myocardial infarctions, nor fatal or non-fatal strokes despite raising HDL cholesterol in patients already taking statins. Reported side effects include an increased risk of new-onset type 2 diabetes.
== Career == Upon receiving his Ph.D., Gattuso moved to Australia where he was a postdoctoral researcher at the Australian Institute of Marine Science(1988-1990). In 1990, Gattuso took a position of CNRS research scientist at Centre de Biologie et Écologie Tropicale et Méditerranéenne of the University of Perpignan (1990-1992). He then moved to the Scientific Center of Monaco to launch and lead the Ecophysiology and Biogeochemistry group. In 1998, Gattuso went back to a CNRS joint laboratory at the Villefranche Oceanographic Observatory and moved to the ranks of Research Professor (directeur de recherche). He is also Associate Scientist at the Institute for Sustainable Development and International Relations (IDDRI-SciencesPo, Paris). Gattuso has been visiting professor or scientist at Rutgers University, the National Center for Atmospheric Research and Shantou University. Gattuso is the founding editor-in-chief of Biogeosciences and served or has served in the editorial board of several scientific journals. He founded the Biogeosciences Division of the European Geosciences Union, and has received multiple awards and honors for his research contributions. He led the launch of the Ocean Acidification International Coordination Centre at the International Atomic Energy Agency, co-edited the first book on ocean acidification (Oxford University Press) and contributed to several IPCC products (5th Assessment Report, Special Report on 1.5°C of Warming, and the Special Report on the Ocean and Cryosphere in a Changing Climate).
Sources: en.wikipedia.org
=== July === 1 July – Balmoral Castle opens to the public for tours for the first time, with daily tours running until 4 August. Steve Carson is to step down as Head of Multi-Platform Commissioning at BBC Scotland in September, in order to take up a senior role at Irish broadcaster RTÉ. 2 July – After rejecting a pay offer in May, waste and recycling staff belonging to Unite in half of Scotland's councils vote to strike. 3 July – Queen Camilla and Prince Edward are formally appointed to the Order of the Thistle at a ceremony in Edinburgh. Moray Council is ordered to pay £346,000 in compensation to a foster family who were wrongly accused of "sexual impropriety" involving children they fostered during the 2010s. 5 July – 2024 United Kingdom general election in Scotland: The SNP suffers heavy losses, going from 48 seats to just nine. With 56 of the 57 seats contested in Scotland declared, Labour win 37, the SNP win nine, while the Conservatives and Liberal Democrats each win five. Starmer ministry: The incoming Labour prime minister Keir Starmer appoints Ian Murray as Secretary of State for Scotland. 6 June – 2024 United Kingdom general election in Scotland: Inverness, Skye and West Ross-shire becomes the final constituency to declare its election results, and sees the number of Liberal Democrat MPs rise to 6 in Scotland after they defeat the SNP to win the seat.
== Chemistry == LGD-4033 is a nonsteroidal SARM with a pyrrolidinyl-benzonitrile core structure and is also referred to as a quinoline or quinolinone SARM. LG121071 (LGD-121071), a tricyclic quinoline, was the predecessor compound of LGD-4033. The chemical structure of LGD-4033 had not been disclosed as late as 2013. LGD-4033 has sometimes been confused with other structurally related Ligand Pharmaceuticals SARMs including LGD-2226, LGD-2941, and LGD-3303, but is a different compound from these agents. LGD-4033 is a small-molecule (molecular weight = 338.3 g/mol) and highly lipophilic (predicted log P = 3.6–3.7) compound.
Receptor tyrosine kinases (RTKs) are the high-affinity cell surface receptors for many polypeptide growth factors, cytokines, and hormones. Of the 90 unique tyrosine kinase genes identified in the human genome, 58 encode receptor tyrosine kinase proteins. Receptor tyrosine kinases have been shown not only to be key regulators of normal cellular processes but also to have a critical role in the development and progression of many types of cancer. Mutations in receptor tyrosine kinases lead to activation of a series of signalling cascades which have numerous effects on protein expression. The receptors are generally activated by dimerization and substrate presentation. Receptor tyrosine kinases are part of the larger family of protein tyrosine kinases, encompassing the receptor tyrosine kinase proteins which contain a transmembrane domain, as well as the non-receptor tyrosine kinases which do not possess transmembrane domains.
Sources: en.wikipedia.org
NMN is nicotinamide mononucleotide, a nucleotide intermediate in NAD+ biosynthesis. It consists of nicotinamide, ribose, and phosphate groups.
No. NMN is a precursor, while NAD+ is the dinucleotide product formed after an adenylate group is added. They are distinct molecules with different cellular roles.
Small amounts of NMN have been reported in several foods, including some vegetables and meats. The concentrations are variable and usually much lower than those used in laboratory research.
NMN is commonly detected by HPLC-UV, LC-MS, or LC-MS/MS. These methods separate the compound from related substances and identify it by retention time and mass.