This is a working overview of creatine, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-04-15 and is reviewed periodically as new material appears.
Several creatine forms are sold, including monohydrate, anhydrous, hydrochloride, nitrate, citrate, and blends. Once dissolved, these forms deliver creatine, but they differ in molar mass, solubility, counterions, and water content. Creatine monohydrate has the largest body of published human data among these forms. Questions remain about whether any alternative form offers meaningful advantages in absorption, tolerability, or tissue uptake under practical conditions. The hydrate form's lower creatine content by mass is a compositional fact, not a statement about effectiveness.
Creatine monohydrate is a crystalline compound formed when one molecule of creatine associates with one molecule of water in the solid lattice. Its molecular formula is C4H11N3O3, and its molar mass is about 149.15 grams per mole. The material appears as a white, odorless powder that dissolves sparingly in water at room temperature. The monohydrate designation distinguishes it from anhydrous creatine, which lacks the bound water and has a lower molar mass. This hydrate is the most common commercial form of creatine used in nutritional and research settings.
Creatine is synthesized endogenously in humans, mainly in the liver, kidney, and pancreas, from the amino acids arginine, glycine, and methionine. Skeletal muscle stores much of the body's creatine, where it participates in the phosphocreatine system that buffers adenosine triphosphate during short, intense contractions. Dietary sources include meat and fish, so omnivorous diets provide additional creatine beyond endogenous production. Supplemental creatine monohydrate supplies the same molecule found in food and tissues, not a distinct drug or hormone. Research interest centers on its role in cellular energy transfer and its effects on muscle and other tissues.
Identity and purity are commonly assessed by high-performance liquid chromatography, often with ultraviolet detection, and by spectroscopic techniques such as infrared or nuclear magnetic resonance. These methods can distinguish creatine from creatinine and detect related impurities. Moisture content may be measured by Karl Fischer titration or loss on drying. Particle size, bulk density, and heavy metal limits are additional quality parameters. Not every product is tested by every method, so specifications depend on the intended use and regulatory framework.
Solid creatine monohydrate is generally stable when kept dry and protected from extremes of heat and humidity. In the presence of moisture, it can gradually convert to creatinine, a cyclic dehydration product that has little value for phosphocreatine synthesis. Elevated temperatures and acidic conditions accelerate this conversion in solution. Because the reaction is slow in cool, dry storage, typical shelf lives are measured in years rather than weeks. Packaging that limits moisture and oxygen exposure helps maintain purity.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C4H11N3O3 | Often written C4H9N3O2·H2O |
| Molar mass | 149.15 g/mol | Anhydrous creatine is 131.13 g/mol |
| Appearance | White crystalline powder | Odorless, fine or granular |
| Water solubility | About 13 g/L at 25 °C | Low; increases with temperature |
| Common synonyms | Creatine hydrate; N-carbamimidoylsarcosine monohydrate | CAS 6020-87-7 |
Analytical laboratories commonly use high-performance liquid chromatography to separate creatine from creatinine and related impurities. Ion chromatography, nuclear magnetic resonance, and titration assays can also quantify the compound. Water content is measured by Karl Fischer titration or loss on drying, because the monohydrate has a defined theoretical water fraction. Particle size, bulk density, and flowability are physical properties that affect blending and capsule filling. These measurements support quality control and help verify that a lot matches its specification.
Regulatory status varies by country. In the United States, creatine monohydrate is sold as a dietary supplement ingredient, while in the European Union it is placed on the market as a food supplement component. Some jurisdictions have established purity monographs or permitted health claims, while others treat it as a novel food or require notification. Product labels may state the amount of creatine monohydrate or the equivalent creatine content, and the two figures can differ. Independent testing programs sometimes check identity, potency, and contaminant limits.
Creatine monohydrate is stable under dry, cool conditions but can degrade when exposed to moisture and heat. In solution, it undergoes hydrolysis to creatinine, a cyclic derivative with little role in phosphagen energy transfer. The rate of conversion increases with temperature, storage time, and acidic or alkaline pH. Solid material kept in a sealed container at room temperature generally retains its composition for extended periods. Moisture uptake is a primary concern because it can accelerate breakdown and caking.
Creatine monohydrate is a crystalline compound formed from creatine and one water molecule in its solid lattice. Creatine itself is a nitrogen-containing organic acid involved in energy transfer in muscle and other tissues. The monohydrate form is the most common solid form used in research and commercial products because it is stable and easy to handle. The term "monohydrate" refers to the fixed one-to-one ratio of water to creatine in the crystal, not to moisture content. This distinction matters when comparing labels or calculating creatine content.
In chemical terms, creatine monohydrate is often described as N-(aminoiminomethyl)-N-methylglycine monohydrate, though nomenclature varies. Its solid state consists of zwitterionic creatine molecules linked with water through hydrogen bonding. The compound dissolves in water, but dissolution rate depends on particle size, temperature, and agitation. Once dissolved, the hydrate water becomes part of the solvent, leaving free creatine in solution. The monohydrate is not the same as creatine anhydrous, which lacks the water of crystallization and has a higher creatine fraction by mass.
DBS research targets include, but are not limited to, the following areas: Cg25 for depression, the anterior limb of the internal capsule for depression as well as obsessive-compulsive disorder (OCD), centromedian/parafasicularis, centromedian thalamic nuclei and the subthalamic nucleus for OCD, anorexia and Tourette syndrome; the nucleus accumbens and ventral striatum have also been assayed for depression and pain.
=== EC 1.17.4 With a disulfide as acceptor === EC 1.17.4.1: ribonucleoside-diphosphate reductase EC 1.17.4.2: ribonucleoside-triphosphate reductase (thioredoxin) EC 1.17.4.3: transferred to EC 1.17.7.1, (E)-4-hydroxy-3-methylbut-2-enyl-diphosphate synthase. EC 1.17.4.4: vitamin-K-epoxide reductase (warfarin-sensitive) EC 1.17.4.5: vitamin-K-epoxide reductase (warfarin-insensitive)
Representative desserts are buñuelos, natillas, Maria Luisa cake, bocadillo made of guayaba (guava jelly), cocadas (coconut balls), casquitos de guayaba (candied guava peels), torta de natas, obleas, flan de mango, roscón, milhoja, manjar blanco, dulce de feijoa, dulce de papayuela, torta de mojicón, and esponjado de curuba. Typical sauces (salsas) are hogao (tomato and onion sauce) and Colombian-style ají. Some representative beverages are coffee (Tinto), champús, cholado, lulada, avena colombiana, sugarcane juice, aguapanela, aguardiente, hot chocolate and fresh fruit juices (often made with water or milk).
Fibromodulin is a protein that in humans is encoded by the FMOD gene. Fibromodulin is a 42kDa protein of a family of small interstitial leucine-rich repeat proteoglycans (SLRPs). It can have up to four N-linked keratan sulfate chains attached to the core protein within the leucine-rich region. It shares significant sequence homology with biglycan and decorin.
The film Deadpool & Wolverine (2024) features many returning characters and actors, including Ryan Reynolds as Wade Wilson / Deadpool, Hugh Jackman as a version of Logan / Wolverine, and Chris Evans—who starred as Steve Rogers / Captain America in the Infinity Saga—as Johnny Storm / Human Torch, reprising his role from Fox's Fantastic Four duology (2005–2007). Feige said Deadpool & Wolverine was the true start to Marvel Studios' use of the Fox characters, and began the MCU's "Mutant era". He said Fox characters would continue to appear through Doomsday and Secret Wars, which would introduce a "new age of mutants and of the X-Men" as part of a reported ten-year plan for the characters. Feige added that one of Marvel's goals for the crossover films was to give closure to storylines that pre-dated the MCU, including those of the Fox X-Men characters, before Secret Wars introduced a recast X-Men team. Doomsday sees additional X-Men film series actors reprising their roles: Ian McKellen (Erik Lehnsherr / Magneto), Alan Cumming (Kurt Wagner / Nightcrawler), Rebecca Romijn (Raven Darkhölme / Mystique), and James Marsden (Scott Summers / Cyclops). The Phase Six film The Fantastic Four: First Steps (2025) introduces Pedro Pascal, Vanessa Kirby, Ebon Moss-Bachrach, and Joseph Quinn as a new version of the Fantastic Four for the MCU. Sadie Sink is introduced as a new version of Jean Grey in Spider-Man: Brand New Day (2026), with that film also featuring Bill Metzger, a radical anti-mutant activist in the comics; and a universal inhibitor that subdues mutant abilities.
Sources: en.wikipedia.org
because it is above thorium's 6.3 eV first ionization energy, neutral 229mTh can decay by internal conversion, and will almost always do so, rather than emitting a photon, and because it is above the 6.2 eV vacuum ultraviolet cutoff, the produced photons cannot travel through air. But even when experiments were redesigned to detect the higher energy, most of the searches in the 2010s for light emitted by the isomeric decay failed to observe any signal, pointing towards a potentially strong non-radiative decay channel. A direct detection of photons emitted in the isomeric decay was claimed in 2012 and again in 2018. However, both reports were controversial within the community. A direct detection of electrons being emitted in the internal conversion decay channel of 229mTh was achieved in 2016. However, at the time the isomer's transition energy could only be weakly constrained to between 6.3 and 18.3 eV. Finally, in 2019, non-optical electron spectroscopy of the internal conversion electrons emitted in the isomeric decay allowed for a determination of the isomer's excitation energy to 8.28±0.17 eV. However, this value appeared at odds with the 2018 preprint showing that a similar signal as an 8.4 eV xenon VUV photon can be shown, but with about 1.3+0.2−0.1 eV less energy and a (retrospectively correct) 1880±170 s lifetime. In that paper, 229Th was embedded in SiO2, possibly resulting in an energy shift and altered lifetime, although the states involved are primarily nuclear, shielding them from electronic interactions.
Inhibitors of dipeptidyl peptidase 4 (DPP-4 inhibitors or gliptins) are a class of oral hypoglycemics that block the enzyme dipeptidyl peptidase-4 (DPP-4). They can be used to treat diabetes mellitus type 2. The first agent of the class—sitagliptin—was approved for marketing by the US Food and Drug Administration (FDA) in 2006. Glucagon increases blood glucose levels, and DPP-4 inhibitors reduce glucagon and blood glucose levels. The mechanism of DPP-4 inhibitors is to increase incretin levels (GLP-1 and GIP), which inhibit glucagon release, which in turn increases insulin secretion, decreases gastric emptying, and decreases blood glucose levels. A 2018 meta-analysis found no favorable effect of DPP-4 inhibitors on all-cause mortality, cardiovascular mortality, myocardial infarction or stroke in patients with type 2 diabetes.
=== Structure === It is an organic compound, associated with the class of L-alpha-amino acids. These compounds have the L-configuration of the alpha carbon atom. Quisqualic acid contains, in its structure a five membered, planar, conjugated, aromatic heterocyclic system, consisting of one oxygen atom and two nitrogen atoms at position 2 and 4 of the oxadiazole ring. The 1,2,4–oxadiazole ring structure is present in many natural products of pharmacological importance. Quisqualic acid, which is extracted from the seeds of Quisqualis indica, is a strong antagonist of AMPA receptors.
The city of Le Havre has some of the oldest sports clubs in France: the Le Havre Rowing Society (1838), the Regatta Society of Le Havre (1838), and Le Havre Athletic Club (1872), doyen of French football and rugby clubs. The city also hosted the sailing events for the 1900 and 1924 Summer Olympics, respectively. Le Havre is dominated by three professional sports teams: the first is the Le Havre AC football team who were relegated from Ligue 1 after the 2008–2009 season but gained promotion back to Ligue 1 in 2023. Its training centre is well-reputed for having trained a number of international French players, including Vikash Dhorasoo, Julien Faubert, Jean-Alain Boumsong, Lassana Diarra, and Steve Mandanda. The second major sports team is Saint Thomas Basketball who represent the city in LNB Pro A. Thirdly the HAC women's team who play in the first division with many international players in its ranks. The team won their first major national title, the Coupe de France for women's handball in 2006. Le Havre Rugby athletic club plays in Fédérale 3 (equivalent to fifth division). The Hockey Club of Le Havre played at the fourth level nationally (Division 3) for the 2008–2009 season. The team is nicknamed the "Dock's du Havre". The maritime side of the city is found in many sports: for example, the tradition of sailing is old. On 29 July 1840 the first French pleasure boat regatta was held. Today, Le Havre is known as a water sports and Seaside resort. The marina can host deepwater vessels around the clock in any weather.
Sources: en.wikipedia.org
Seeded 13th, he earned his first victory over Alexander Bublik by beating him in the first round in three sets. In the second round, he defeated world No. 29, Roberto Bautista Agut, in the second round. In the third round, he lost to third seed, Daniil Medvedev, despite serving for the match twice and having two match points in the third-set tie-break. This defeat was his seventh out of the last eight matches played with Medvedev. Seeded third at the BMW Open in Munich, he was defeated in the second round by Christopher O'Connell. Seeded 13th at the Madrid Open, he recorded his 350th career win by defeating Roberto Carballés Baena in the second round, becoming the only player under 30 to reach this milestone. In the third round, he overpowered qualifier, Hugo Grenier, in 55 minutes. In the fourth round, he lost to top seed, world No. 2, defending champion, and eventual champion, Carlos Alcaraz, in a rematch of the previous year's final. Failing to defend his finalist points from last year, his ranking fell from 16 to 22. Seeded 19th at the Italian Open, he made it to the fourth round where he lost to third seed and eventual champion, Daniil Medvedev. Having made the semifinals last year, his ranking again fell, this time from 22 to 27. Seeded third at the Geneva Open, he reached the semifinal where he lost to Nicolás Jarry, who would end up winning the tournament. Seeded 22nd at the French Open, he defeated Lloyd Harris, Alex Molčan, 12th seed Frances Tiafoe, and 28th seed Grigor Dimitrov in his first four rounds. In the quarterfinals, he faced Tomás Martín Etcheverry.
After his abdication on 14 December 1918, Ukrainian hetman Pavlo Skoropadskyi emigrated to Germany. From there he led the so-called Hetman movement (Ukrainian: Гетьманський рух), which consisted of a number of Ukrainian conservative monarchist organizations from different groups of Ukrainian diaspora. Most prominent of these organizations were the Ukrainian Union of Agrarians-Statists (Ukrainian: Український союз хліборобів-державників) founded in Vienna by Vyacheslav Lypynskyi and Serhiy Shemet, and the United Hetman Organization (Ukrainian: Союз гетьманців державників) active in Canada and the United States. In his "Letters to Brothers Agrarians", published in 1926, Lypynskyi elaborated the idea of an independent, classocratic, pan-Ukrainian "toilers' monarchy" without political parties, ruled by hetman and his dynasty with the help of an agrarian aristocracy and the co-operation of the productive classes. In Canada and the United States the Hetman movement emerged from the pre-WW1 Sich scouting societies and was implicitly supported by the Ukrainian Greek-Catholic Church. The movement supported the re-establishment of the Hetman state of Pavlo Skoropadskyi and devoted a lot of energy to military training of Ukrainian émigrés for the future liberation of their homeland, going as far as to acquire a number of airplanes. In 1940 the Canadian branch of the organization became one of the founders of the Ukrainian Canadian Congress.
Selenium has seven naturally occurring isotopes. Five of these, 74Se, 76Se, 77Se, 78Se, 80Se, are stable, with 80Se being the most abundant (49.6% natural abundance). Also naturally occurring is the long-lived primordial radionuclide 82Se, with a half-life of 8.76 × 1019 years. The non-primordial radioisotope 79Se also occurs in minute quantities in uranium ores as a product of nuclear fission. Selenium also has numerous unstable synthetic isotopes ranging from 64Se to 95Se; the most stable are 75Se with a half-life of 119.78 days and 72Se with a half-life of 8.4 days. Isotopes lighter than the stable isotopes primarily undergo beta plus decay to isotopes of arsenic, and isotopes heavier than the stable isotopes undergo beta minus decay to isotopes of bromine, with some minor neutron emission branches in the heaviest known isotopes.
Sources: en.wikipedia.org
It is the hydrated crystalline form of creatine, containing one bound water molecule per creatine unit. The compound is commonly used as a nutritional ingredient and as a research material.
Yes, endogenous synthesis occurs mainly in the liver, kidney, and pancreas. Meat and fish also contribute creatine to the diet.
Other forms contain creatine paired with different counterions or lacking water, so their mass and solubility differ. After dissolution, creatine itself is the shared active molecule.
Solid product can remain within specification for years when stored dry and sealed, but expiration dates reflect manufacturer testing and regulatory conventions. Moisture and heat increase conversion to creatinine, so storage conditions matter more than the printed date alone. Degradation is gradual and can be monitored by purity testing.