A practical reference on creatine: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-07-06. Anything still debated is marked as such rather than presented as settled.
Commercial creatine products appear in several forms, including monohydrate, hydrochloride, citrate, nitrate, and ethyl ester. Creatine monohydrate is the most studied form and serves as a reference material in comparative research. Different forms vary in solubility, pH, and water content, but they share creatine as the active moiety after dissolution. Claims that one form is uniformly superior remain debated, and study designs often differ in population, exercise protocol, and outcome measures. Purity and hydration state are central to interpreting product labels.
Creatine monohydrate is the hydrated form of creatine, a nitrogen-containing organic acid involved in cellular energy transfer. Its molecular formula is C4H11N3O3, and it consists of creatine plus one water molecule in the crystal lattice. The anhydrous base, creatine, has the formula C4H9N3O2. The compound appears as a white, odorless, crystalline powder and is classified as a guanidine derivative. It is distinct from creatinine, a breakdown product measured in clinical chemistry.
In animals, creatine is synthesized mainly in liver, kidney, and pancreas from arginine, glycine, and methionine. The first committed step transfers a guanidino group from arginine to glycine, forming guanidinoacetate. Subsequent methylation by S-adenosylmethionine yields creatine. Dietary sources include meat and fish; endogenous synthesis supplies part of the body pool. Most creatine is stored in skeletal muscle, where it is converted to phosphocreatine and participates in rapid regeneration of adenosine triphosphate during short, intense activity.
Creatine was first identified in skeletal muscle extracts in the nineteenth century, and its role in phosphagen energy buffering was clarified in the twentieth century. The monohydrate salt became widely studied after methods for inexpensive synthesis and crystallization were developed. Modern research examines its effects on muscle energetics, recovery, and cognitive performance under specific conditions. Findings vary with population, exercise protocol, baseline creatine status, and measurement method. Studies often compare supplementation with placebo during controlled training or testing schedules.
Creatine monohydrate is a hydrated form of creatine, a nitrogen-containing compound involved in cellular energy metabolism. Its molecular formula is C4H9N3O2·H2O, with a molar mass around 149.15 g/mol. The monohydrate is the most common solid form used in research and commercial settings because it crystallizes readily and remains stable under ordinary conditions. The term monohydrate indicates one water molecule per creatine molecule in the crystal lattice. It appears as a white crystalline powder with low odor.
In the body, creatine is synthesized from arginine, glycine, and methionine, mainly in the liver and kidneys, and is also obtained from foods such as meat and fish. About 95% of body creatine is stored in skeletal muscle, where a fraction is phosphorylated to phosphocreatine. Phosphocreatine serves as a rapid reserve of high-energy phosphate for short bursts of ATP regeneration. The monohydrate form supplies creatine after dissolution and absorption, but it is not itself the active phosphorylated species.
| Property | Value | Notes |
|---|---|---|
| Chemical formula (monohydrate) | C4H11N3O3 | Includes one water molecule per creatine unit. |
| Molecular weight | 149.15 g/mol | Calculated for the monohydrate; anhydrous creatine is 131.13 g/mol. |
| Appearance | White crystalline powder | Odorless; particle size can vary by manufacturing. |
| CAS Registry Number | 6020-87-7 | Identifies creatine monohydrate; creatine base is 57-00-1. |
| Common synonyms | Creatine hydrate; methylguanidoacetic acid monohydrate | Naming varies by registry and supplier. |
In the human body, creatine is synthesized mainly in the liver and kidneys from the amino acids glycine, arginine, and methionine. Dietary sources include meat, fish, and other animal tissues, which supply preformed creatine. Because plant foods contain little or no creatine, dietary intake varies widely among populations. The compound is stored largely in skeletal muscle, where it is converted to phosphocreatine and used to regenerate adenosine triphosphate during short bursts of activity.
Creatine monohydrate is one of several solid forms of creatine described in the literature. Other forms include anhydrous creatine, creatine hydrochloride, and creatine ethyl ester, each with different solubility and stability characteristics. The monohydrate is distinct from creatinine, a spontaneous breakdown compound that forms when creatine loses water and cyclizes. Commercial descriptions sometimes use synonyms such as methylguanidoacetic acid or N-(aminoiminomethyl)-N-methylglycine, which refer to the same base molecule. These names appear in chemical databases and product labels.
Creatine monohydrate is a crystalline compound formed when one molecule of creatine binds with one molecule of water. Creatine itself is a nitrogen-containing organic acid involved in cellular energy transfer, particularly in muscle and nerve tissue. The monohydrate form is the most common solid form used in research and commercial products because it is relatively stable and easy to handle. Its molecular formula is C4H9N3O2·H2O, and its molar mass is about 149.15 grams per mole.
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.
Laboratory analysis of creatine monohydrate typically uses high-performance liquid chromatography to separate creatine from creatinine and other impurities. Detection may be ultraviolet, refractive index, or mass spectrometric, depending on the laboratory's equipment and the required sensitivity. Nuclear magnetic resonance spectroscopy can quantify the main component and identify related substances. Water content is measured by Karl Fischer titration, which is important because the monohydrate has a defined theoretical hydration level. Heavy metals, residual solvents, and microbial limits are also checked in quality control programs.
Commercial creatine monohydrate is produced mainly by chemical synthesis rather than extraction from animal tissue. Suppliers provide a certificate of analysis listing assay, water content, and impurity limits, and some products undergo third-party testing. Verification of identity can use infrared or Raman spectroscopy alongside chromatographic methods. Storage recommendations generally call for a cool, dry place and a tightly closed container to limit moisture uptake. Open questions include how packaging, flavoring agents, and long-term storage affect the stability of finished products.
Dry creatine monohydrate is generally stable when kept sealed and protected from heat and moisture. In solution, however, creatine undergoes a slow cyclization to creatinine, a related compound with no role in phosphocreatine storage. The rate of this conversion increases with temperature and is influenced by pH. Because creatinine is a common impurity in liquid or poorly stored products, analytical testing often measures both compounds. The crystalline monohydrate is less prone to degradation than aqueous preparations, though caking can occur if moisture enters the container.
Creatine monohydrate is a crystalline compound formed from creatine and one molecule of water. Its systematic name is N-(aminoiminomethyl)-N-methylglycine monohydrate, and it appears as a white, odorless powder with limited solubility in water. The monohydrate is the most common solid form used in research and commercial products because it is stable under dry conditions. The anhydrous form lacks the water of crystallization and differs slightly in molar mass. Both forms participate in the same biochemical reactions once dissolved.
In the body, creatine is synthesized from the amino acids arginine, glycine, and methionine, primarily in the liver and kidneys. It is transported to muscle and other tissues, where it is phosphorylated to phosphocreatine by creatine kinase. This phosphagen system provides a rapid source of adenosine triphosphate during short, intense contractions. Dietary creatine comes mainly from meat and fish, and the body's total pool is influenced by both synthesis and intake.
As a supplement, creatine monohydrate is studied for its effects on muscle performance and recovery. The compound is often described as an ergogenic aid, meaning it may support physical work capacity. Research typically compares it with placebo or other forms, such as citrate or nitrate, under controlled conditions. Questions remain about the optimal dose and long-term effects in different populations, and findings are not uniform across all studies. The monohydrate form remains the most extensively tested.
== Properties == nanoCLAMPs are the first antibody mimetics described to be polyol-responsive, meaning they release their targets upon exposure to a non-chaotropic salt and a polyol, such as propylene glycol. This property has been shown to be useful for purifying functional proteins and protein complexes by affinity purification. nanoCLAMPs are easily produced in the cytoplasm of E. coli, with typical yields in the range of 50 to 300 mg/L culture. Because nanoCLAMPs are devoid of cysteines, an engineered C-terminal cysteine can be used for site-directed conjugation of entities like fluorophores or resins using thiol-chemistry.
Romania terminated its mission in Iraq and withdrew its last troops on 24 July 2009, among the last countries to do so. The frigate the Regele Ferdinand participated in the 2011 military intervention in Libya. In December 2011, the Romanian Senate unanimously adopted the draft law ratifying the Romania-United States agreement signed in September of the same year that would allow the establishment and operation of a US land-based ballistic missile defence system in Romania as part of NATO's efforts to build a continental missile shield. The Aegis Ashore missile system based at Deveslu became operational in 2016. In 2024, construction work started on expanding the Mihail Kogălniceanu Air Base (RoAF 57th Air Base). The air base is set to become the largest NATO base in Europe after the implementation of a project spanning 20 years.
It is assumed that the transection of white substance of the frontal lobes impairs their connection with the thalamus and eliminates the possibility of receiving from it stimuli which lead to irritation and, on the whole, derange mental functions. This explanation is mechanistic and goes back to the narrow localizationism characteristic of American psychiatrists, from where leucotomy was imported to us. The Soviet Union officially banned the procedure in 1950 on the initiative of Gilyarovsky. Doctors in the Soviet Union concluded that the procedure was "contrary to the principles of humanity" and "'through lobotomy' an insane person is changed into an idiot". By the 1970s, numerous countries had banned the procedure, as had several US states. In 1977 after the National Research Act created the National Commission for the Protection of Human Subjects of Biomedical and Behavioral Research, the Commission investigated allegations that psychosurgery – including lobotomy techniques – were used to control minorities and restrain individual rights. Its published report did not recommend a ban on psychosurgery, but noted that the risks to patients from psychosurgery and its potential abuse required strong safeguards. Torsten Wiesel has called the award of the Nobel Prize to Moniz an "astounding [error] of judgment ... a terrible mistake", and there have been calls for the Nobel Foundation to rescind the award.
=== Displays === StoreDot was founded in 2012 by Doron Myersdorf, Simon Litsyn, and Gil Rosenman, initially developing displays and storage devices based on research by Ehud Gazit. A year later its CEO, Myersdorf, said their peptide-based display technology is ready to be "packed and sold" and its related intellectual property could be sold for 300 million dollars. The displays and storage devices were based on "peptide nanocrystals", and a prototype storage device was made in 2012 that is "three times faster than conventional memory." The company's CEO said the display technology is 20% more power-efficient and 90% less costly to manufacture than OLED, and the displays were ready in 2015 for full-scale manufacturing using existing factories and manufacturing processes, and were to be commercialized by 2016. By 2019 the display technology was spun off into its own company, MolecuLED. As of 2022, MolecuLED had no employees.
=== Dosages === For prostate cancer, the dosage of buserelin by subcutaneous injection is 500 μg three times per day (once every 8 hours, 1,500 μg/day total) for one week and then 200 μg once daily thereafter. If buserelin is used as a nasal spray, the dosage for prostate cancer is 800 μg sprayed into the nostrils three times per day (once every 8 hours, 2,400 μg/day total) for one week followed by 400 μg sprayed into the nostrils three times per day (once every 8 hours, 1,200 μg/day total) thereafter. For endometriosis, buserelin is used specifically as a nasal spray and the dosage is the same as that used for prostate cancer. These dosages of buserelin for both subcutaneous injection and nasal spray have been found to decrease testosterone levels to near-castrate levels in men with prostate cancer, although suppression was more complete with subcutaneous injection presumably due to suboptimal absorption with intranasal administration.
Sources: en.wikipedia.org
Neutrophilia is an increase in the absolute neutrophil count in the peripheral circulation. Normal blood values vary by age. Neutrophilia can be caused by a direct problem with blood cells (primary disease). It can also occur as a consequence of an underlying disease (secondary). Most cases of neutrophilia are secondary to inflammation. Primary causes
24997Bk(n,γ)25097Bk → 25098Cf + β− Bombardment of 250Cf with neutrons produces 251Cf and 252Cf. Prolonged irradiation of americium, curium, and plutonium with neutrons produces milligram amounts of 252Cf and microgram amounts of 249Cf. As of 2006, curium isotopes 244 to 248 are irradiated by neutrons in special reactors to produce mainly californium-252 with lesser amounts of isotopes 249 to 255. Microgram quantities of 252Cf are available for commercial use through the U.S. Nuclear Regulatory Commission. Only two sites produce 252Cf: Oak Ridge National Laboratory in the U.S., and the Research Institute of Atomic Reactors in Dimitrovgrad, Russia. As of 2003, the two sites produce 0.25 grams and 0.025 grams of 252Cf per year, respectively. Three californium isotopes with significant half-lives are produced, requiring a total of 15 neutron captures by uranium-238 without nuclear fission or alpha decay occurring during the process. 253Cf is at the end of a production chain that starts with uranium-238, and includes several isotopes of plutonium, americium, curium, and berkelium, and the californium isotopes 249 to 253 (see diagram).
== Side effects == Some side effects are hypoglycemia (low blood sugar), hypokalemia (low blood potassium), and allergic reactions. Allergy to insulin affected about 2% of people, of which most reactions are not due to the insulin itself but to preservatives added to insulin such as zinc, protamine, and meta-cresol. Most reactions are Type I hypersensitivity reactions and rarely cause anaphylaxis. A suspected allergy to insulin can be confirmed by skin prick testing, patch testing and occasionally skin biopsy. First line therapy against insulin hypersensitivity reactions include symptomatic therapy with antihistamines. The affected persons are then switched to a preparation that does not contain the specific agent they are reacting to or undergo desensitization. Cutaneous adverse effects Other side effects may include pain or skin changes at the sites of injection. Repeated subcutaneous injection without site rotation can lead to lipohypertrophy and amyloidomas, which manifest as firm palpable nodules under the skin.
== Phone intercepts == In September 2008, Georgia presented to the public recordings of intercepted phone calls made on 7 August by Ossetian border guards on a Georgian cellular network, which were then independently translated from the original Ossetian language by The New York Times. The recordings, allegedly proving that entry of Georgian troops into Tskhinvali was preceded by movement of part of a Russian armoured regiment into South Ossetia nearly a day earlier, were reviewed and assessed as valid by senior American government and military officials. According to a call recorded at 3:52 am on 7 August, a South Ossetian servicemen at the tunnel with the surname Gassiev was asked by a supervisor at the headquarters if the armor had arrived, to which he replied: "The armor and people." The guard also said that the people had gone through, while "they had already arrived" 20 minutes earlier. Gassiev told the supervisor in the first call at 3:41 am that an inspection of military vehicles inside the tunnel had been requested by the Russian colonel, but Gassiev did not know the exact identity of the colonel. Gassiev reported the exit of armored vehicles from the tunnel to the supervisor at 3:52 am. Authenticity of the calls was not questioned by Russia. Colonel Andrei Kazachenko who was mentioned in the recording, belonged to the 135th Motorized Rifle Regiment, according to Russian media reports after the war.
Sources: en.wikipedia.org
== Enzymes that use NADP(H) as a substrate == In 2018 and 2019, the first two reports of enzymes that catalyze the removal of the 2' phosphate of NADP(H) in eukaryotes emerged. First the cytoplasmic protein MESH1 (Q8N4P3), then the mitochondrial protein nocturnin were reported. Of note, the structures and NADPH binding of MESH1 (5VXA) and nocturnin (6NF0) are not related.
=== Podcasts === Conversations avec Marie, March 2019 Héroïnes de la rue, April 2019 Le dernier homme, April 2021 Écoutez les survivantes, June 2021 Ma fortune, March 2022 Au peuple des femmes, May 2022
=== Surface structure and chemical environment === The precise structure of the ligands on the surface of colloidal gold NPs impact the properties of the colloidal gold particles. Binding conformations and surface packing of the capping ligands at the surface of the colloidal gold NPs tend to differ greatly from bulk surface model adsorption, largely due to the high curvature observed at the nanoparticle surfaces. Thiolate-gold interfaces at the nanoscale have been well-studied and the thiolate ligands are observed to pull Au atoms off of the surface of the particles to form "staple" motifs that have significant Thiyl-Au(0) character. The citrate-gold surface, on the other hand, is relatively less-studied due to the vast number of binding conformations of the citrate to the curved gold surfaces. A study performed in 2014 identified that the most-preferred binding of the citrate involves two carboxylic acids and the hydroxyl group of the citrate binds three surface metal atoms.
Sources: en.wikipedia.org
Creatine is the base compound, while creatine monohydrate includes one water molecule per creatine molecule in its crystal structure. The monohydrate form is common in supplements and analytical standards. The body uses creatine itself after the water is removed or dissociated.
Yes. Meat, fish, and other animal tissues contain creatine. Cooking can convert some creatine to creatinine, which has no role in phosphocreatine energy buffering. Plant foods contain little or no creatine.
Creatinine is a cyclic breakdown product formed from creatine and phosphocreatine. It is filtered by the kidneys and commonly measured in blood and urine as a marker of renal function. Creatine monohydrate is a supplement ingredient and research chemical, not the same molecule.
Creatine is the base compound, while creatine monohydrate is a solid crystalline form that contains one water molecule per creatine molecule. Once dissolved, the monohydrate dissociates and releases creatine, which can participate in cellular energy metabolism. The monohydrate is the form most commonly used in research and commercial products.