If you have been reading about creatine and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
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.
In the body, creatine is obtained from dietary meat and fish and is also synthesized from arginine, glycine, and methionine. Muscle stores creatine and phosphocreatine, which participate in the rapid regeneration of adenosine triphosphate during short, intense activity. The monohydrate form is used in research because it is chemically defined, stable as a dry solid, and relatively inexpensive to produce. Questions remain about whether other creatine forms offer meaningful advantages in absorption or tissue retention, and findings vary across studies and populations.
Creatine monohydrate is a crystalline compound formed from creatine and one molecule of water. Creatine itself is a nitrogen-containing organic acid that occurs in vertebrate muscle and other tissues. The monohydrate designation refers to the water included in the crystal lattice, not to water added during manufacturing. Its chemical formula is commonly written as C4H9N3O2·H2O. The solid is typically a white, odorless powder with low solubility in water at room temperature. It is one of several creatine forms described in scientific and commercial literature.
| 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 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.
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.
Solid creatine monohydrate is generally stable when kept cool and dry, but it can hydrolyze to creatinine over time. Moisture, heat, and acidic conditions accelerate this conversion, which reduces assay values and changes the material's properties. Creatinine is a cyclic dehydration product that is also a normal human metabolite, so its presence in a sample is not necessarily a health concern by itself. In quality testing, creatinine is monitored as a marker of degradation and purity.
Identity and purity are assessed with several complementary methods. High-performance liquid chromatography can separate creatine from creatinine and related impurities, often with ultraviolet detection. Nuclear magnetic resonance and infrared spectroscopy provide structural confirmation, while Karl Fischer titration measures water content. Elemental analysis and mass spectrometry may be used for additional confirmation, especially in research or forensic settings. No single method captures every quality attribute, so laboratories typically combine results and compare them against a specification.
=== Measures of success === Success of liquid–liquid extraction is measured through separation factors and decontamination factors. The best way to understand the success of an extraction column is through the liquid–liquid equilibrium (LLE) data set. The data set can then be converted into a curve to determine the steady state partitioning behavior of the solute between the two phases. The y-axis is the concentration of solute in the extract (solvent) phase, and the x-axis is the concentration of the solute in the raffinate phase. From here, one can determine steps for optimization of the process.
=== Orthologs === There were orthologs identified in most animals for which there were complete genome data. The most distant, yet still relevant, orthologs identified were invertebrates from phylum Cnidaria.
== Spinal epidural space == In the spinal canal, the periosteal layer adheres to the inner surface of the spinal canal which is formed by the bodies of vertebrae. The meningeal layer lays over the spinal arachnoid mater. Between the vertebrae and the dural sheath is the spinal epidural space. Unlike the cranial epidural space, the spinal epidural space contains adipose tissue, the internal vertebral venous plexuses and the spinal nerve roots. The spinal epidural space spans the length of the spinal cord, from the foramen magnum superiorly to the sacral hiatus inferiorly. Epidural space is the smallest at the cervical region, measuring 1 to 2 mm. At L2 to L3, enlarges until 5 to 6 mm. It then enlarges progressively until lower lumbar and sacral region. However, some authors stated that it decreases in size after mid-lumbar region until 2 mm at S1 level.
== Further reading == Genck, Wayne (7 November 2010). "Make The Most of Antisolvent Crystallization". Chemical Processing. Putman Media. Retrieved 12 June 2025. Sheehan, David (2009). Physical Biochemistry: Principles and Applications. John Wiley & Sons. p. 285. ISBN 978-0-470-85602-4. Miller, S A; Dykes, D D; Polesky, H F (11 February 1988). "A simple salting out procedure for extracting DNA from human nucleated cells". Nucleic Acids Research. 16 (3): 1215. CiteSeerX 10.1.1.941.1917. doi:10.1093/nar/16.3.1215. PMC 334765. PMID 3344216. {{cite journal}}: Cite uses deprecated parameter |citeseerx= (help) McKay, H. A. C. (1 January 1953). "Activities and activity coefficients in ternary systems". Transactions of the Faraday Society. 49: 237–242. doi:10.1039/TF9534900237.
== Guidelines for health-carers planning to teach with AIDA == An independent diabetologist / endocrinologist — unconnected with AIDA's development — has teamed up with one of the AIDA developers to highlight ways in which health-carer professionals may improve the outcome of lessons that make use of the simulator. Among the most important points highlighted seem to be the preparation of the teacher, consideration of how to impart preliminary information to help people understand the pathophysiology of diabetes, the optimum selection of topics to be covered, the arrangement of the lessons, how to involve each of the participants, and how to deal with questions. Other important issues include how to spot and deal with some of the difficulties that may be encountered by participants who apparently seem uninterested, obtaining feedback from the lessons, and practical ideas about how to lead a class. Guidelines for health-care professionals planning to teach with AIDA have been published in the diabetes literature. The same authors have also put together some recommended training requirements for health-carers planning to teach using the AIDA interactive educational diabetes simulator.
Sources: en.wikipedia.org
=== Myocardial atrophy === Deficiency in myomesin 1 causes atrophy and dysfunction in its tissue. In cardiomyocytes, sarcomere length and uniformity are decreased when MYOM1 is absent, resulting in smaller cardiomyocytes. This is also linked to issues in contractile function due to the disruption of calcium levels in the tissue.
The most common form of body modification related to the penis is circumcision: removal of part or all of the foreskin, and sometimes the frenulum. It is most commonly performed as an elective procedure for prophylactic, cultural, or religious reasons. Infant circumcision can employ modern devices such as the Gomco clamp, Plastibell, and Mogen clamp. The ethics of circumcision in children is a source of controversy. Among the world's major medical organizations, there is a consensus that circumcision reduces heterosexual HIV infection rates in high-risk populations during penile-vaginal sex. There are differing perspectives on the prophylactic efficacy and cost effectiveness of circumcision in developed nations. Circumcision plays a significant role in many of the world's cultures. When performed for religious reasons, it is most common among both Jews and Muslims, among whom it is near-universal.
The Kizil Caves (also romanized as Qizil or Qyzyl; Uyghur: قىزىل مىڭ ئۆي, lit. 'The Thousand Red Houses'; Chinese: 克孜尔千佛洞; lit. 'Kizil Caves of the Thousand Buddhas') are a set of Buddhist rock-cut caves located near Kizil Township (克孜尔乡; Kèzī'ěr Xiāng) in Baicheng County, Aksu Prefecture, Xinjiang, China. The site is located on the northern bank of the Muzat River 65 kilometres (40 miles) (75 km; 50 miles by road) west of Kucha. This area was a commercial hub of the Silk Road. The caves have an important role in Central Asian art and in the Silk Road transmission of Buddhism, and are said to be the earliest major Buddhist cave complex in China, with development occurring between the 3rd and 8th centuries CE. The caves of Kizil are the earlier of their type in China, and their model was later adopted in the construction of Buddhist caves further east. Another name for the site has been Ming-oi (明屋), although this term is now mainly used for the site of Shorchuk to the east. The Kizil Caves were inscribed in 2014 on the UNESCO World Heritage List as part of the Silk Roads: the Routes Network of Chang'an-Tianshan Corridor World Heritage Site.
Although higher energies can produce more astatine-211, it will produce unwanted astatine-210 that decays to toxic polonium-210 as well. Instead, the maximum energy of the particle accelerator is set to be below or slightly above the threshold of astatine-210 production, in order to maximize the production of astatine-211 while keeping the amount of astatine-210 at an acceptable level.
Sources: en.wikipedia.org
Women have also faced human rights abuses and war crimes inside Assad prisons. A 2017 report by Lawyers and Doctors for Human Rights (LDHR) collected first-hand accounts from women who survived rape and torture in Assad prisons. The 2017 Amnesty report on Syria's Sednaya Prison described the torture methods and living conditions of military detention centres and prisons as "subhuman", stating: "Detainees are tortured beginning from the moment of their arrest, during their "welcome parties" – a term commonly used by Syrian detainees and guards to refer to the severe beatings received upon arrival at a detention facility – and throughout their interrogations.. Common methods of torture include severe beating, the use of electric shocks, sexual violence including rape and stress positions. These methods are often used in combination during multiple sessions over the course of days, weeks or months... detainees are held in subhuman conditions and systematically denied their basic needs, including food, water, medicine, medical care and sanitation. They are packed into filthy, overcrowded cells without access to fresh air, sunlight or ventilation. In these conditions, scabies, lice, infections and diseases run rampant, and many detainees develop serious mental illnesses such as psychosis. As a result of the torture and conditions they are forced to endure, detainees in government custody are dying on a massive scale." On 23 April 2020, two ex-Syrian secret police officers, Anwar R.
Rodney Smith Markin (born 1956), is an American pathologist and authority in the field of laboratory automation. In 1993, he designed and created one of the world's first automated clinical laboratory specimen, device and analyzer management systems. In the mid-1990s, he chaired a standards group called the Clinical Testing Automation Standards Steering Committee (CTASSC) of the American Association for Clinical Chemistry, which later evolved into an area committee of the Clinical and Laboratory Standards Institute. Markin serves as the Vice President for Business Development and practices pathology at Nebraska Medicine, is associate vice chancellor for business development for the University of Nebraska Medical Center, and executive director of the UNeTech Institute of the University of Nebraska Medical Center and the University of Nebraska Omaha. He serves as both the David T. Purtilo Professor in the Department of Pathology and Microbiology in UNMC's College of Medicine as well as the Executive Director of the UNeTech Institute. Prior to his current position, he was the chief operating officier of the University of Nebraska system, the chief technology officer at UNMC, interim dean of the UNMC College of Medicine, board chairman and president and CEO of the Nebraska Medicine clinical practice plan (fka UNMC Physicians), an academic medical practice which includes more than 750 physicians, and has held several other administrative and academic positions at the University of Nebraska Medical Center.
== History == Tiagabine was discovered at Novo Nordisk in Denmark in 1988 by a team of medicinal chemists and pharmacologists under the general direction of Claus Bræstrup. The drug was co-developed with Abbott Laboratories, in a 40/60 cost sharing deal, with Abbott paying a premium for licensing the IP from the Danish company. It was approved for treatment of epilepsy in the United States in September 1997. In 2005, a bolded warning was added to the labeling of tiagabine by the United States Food and Drug Administration cautioning about association of new-onset seizures in people without epilepsy and discouraging off-label use. Tiagabine was previously subject to Risk Evaluation and Mitigation Strategies (REMS) in the United States, which was instituted in 2010. However, this requirement was eliminated in 2012. United States patents on tiagabine listed in the Orange Book expired in April 2016.
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.
It is a crystalline form of creatine that contains one water molecule per creatine molecule. The compound occurs naturally in muscle tissue and is also produced synthetically for research and consumer products. The monohydrate label describes the solid's hydration state.