This is a working overview of Anhydrous creatine, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-12-17. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C4H9N3O2·H2O | Monohydrate; anhydrous base is C4H9N3O2 |
| Molar mass | 149.15 g/mol | Calculated for the monohydrate form |
| Appearance | White crystalline powder | Typical laboratory and food-grade material |
| Solubility in water | Sparingly soluble at room temperature | Solubility increases with temperature |
| Common synonyms | Methylguanidoacetic acid; N-(aminoiminomethyl)-N-methylglycine | Synonyms refer to the creatine base, not the hydrate specifically |
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.
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 a crystalline organic compound formed from creatine and water in a one-to-one ratio. It belongs to the guanidino family and contains a methylated guanidine group attached to an acetate-like chain. The solid is commonly described as a white, odorless powder with a mildly bitter taste. Its molecular formula is C4H11N3O3·H2O, and the hydrated form is the most widely traded grade. The compound occurs naturally in vertebrate muscle and brain tissue, where it participates in rapid energy buffering.
In aqueous solution, creatine monohydrate exists mainly as a zwitterion, carrying both a positive guanidinium charge and a negative carboxylate charge. This charge separation raises water solubility relative to many neutral organic solids and helps explain its behavior in analytical separations. The monohydrate can lose its water of crystallization under sustained heat or low humidity, converting toward anhydrous creatine. Such transitions matter for mass balance calculations because the hydrate contributes water mass that is not part of the active creatine molecule.
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.
Wild arapaima are harpooned or caught in large nets. Since the arapaima needs to surface to breathe air, traditional arapaima fishermen harpoon them and then club them to death. An individual fish can yield as much as 70 kg (150 lb) of meat. The arapaima was introduced for fishing in Thailand and Malaysia. Fishing in Thailand can be done in several lakes, where specimens over 150 kg (330 lb) are often landed and then released. On 14 May 2020, a 30 kg (66 lb) specimen was found floating in the river in Angkor Wat area, Krovanh village, Sangkat Norkor Thom, Siem Reap, Cambodia; the locals said it was a rare fish, and not commonly seen in this area. With catch-and-release after the fish is landed, it must be held for 5 minutes until it takes a breath. The fish has a large blood vessel running down its spine, so lifting the fish clear of the water for trophy shots can rupture this vessel, causing death.
== Structure == Most RTKs are single subunit receptors but some exist as multimeric complexes, e.g., the insulin receptor that forms disulfide linked dimers in the presence of hormone (insulin); moreover, ligand binding to the extracellular domain induces formation of receptor dimers. Each monomer has a single hydrophobic transmembrane-spanning domain composed of 25 to 38 amino acids, an extracellular N terminal region, and an intracellular C terminal region. The extracellular N terminal region exhibits a variety of conserved elements including immunoglobulin (Ig)-like or epidermal growth factor (EGF)-like domains, fibronectin type III repeats, or cysteine-rich regions that are characteristic for each subfamily of RTKs; these domains contain primarily a ligand-binding site, which binds extracellular ligands, e.g., a particular growth factor or hormone. The intracellular C terminal region displays the highest level of conservation and comprises catalytic domains responsible for the kinase activity of these receptors, which catalyses receptor autophosphorylation and tyrosine phosphorylation of RTK substrates.
The General dumps the cargo module Archer is hiding in to gain speed and leaves the AI facility's science team behind to die. As Archer progresses through the facility, he learns that the Mainframe's primary battle is with a major Xenome infestation that the humans brought onto the moon. Fighting both attack drones and Xenomes alike, Archer makes his way through the facility. Despite the Mainframe's best efforts, Archer manages to destroy most of the "kata-space anchors" that keep the moon from falling to the planet below. Archer survives the destruction of the anchors, but is stranded on the falling moon. Archer eventually finds the Mainframe and they form an uneasy alliance: the Mainframe will provide an aerial drone for Major Archer to escape in, but only if he takes the Mainframe's core with him. Major Archer agrees, and they battle through hordes of Xenome forces with the help of the Mainframe's attack drones. Major Archer and the AI successfully reach and board the aerial drone, but fail to navigate through an asteroid field on their way into kata-space and crash land on a desert planet called Icnus, encountering and fighting rogue Gunmen. Icnus turns out to be the location of the General's main Xenome facility. Archer battles his way through the facility with the help of the Mainframe, accidentally causing a captured Worm Xenome, one of the most dangerous Xenomes in existence, to break loose. The Mainframe helps Archer to the General's location and they engage in a firefight, where the AI's newly constructed Super Drone defeats the General's Kata-Drone.
Sources: en.wikipedia.org
These studies, generally small and often single-center with short- to mid-term follow-up, report that laser-based techniques may be associated with reduced postoperative pain, shorter operative time, shorter hospital stay, faster wound healing, and improved cosmetic outcomes, with recurrence rates broadly comparable to conventional surgery in the short term. Systematic reviews and meta-analyses of laser treatment in pilonidal disease report primary healing rates of approximately 80–85% and relatively low complication rates, with recurrence rates varying depending on follow-up duration and study design. A broader meta-analysis of minimally invasive techniques suggests that laser ablation may be associated with a lower risk of recurrence compared with excisional surgery, although the included studies are heterogeneous. A systematic review by Romic et al. (2022), including 10 studies with 971 patients, reported a primary healing rate of 94.4% and a weighted mean recurrence rate of 3.8% following sinus laser-assisted closure. The authors concluded that laser treatment represents a promising option for managing chronic PD based on the published literature.
A vacuum (pl.: vacuums or vacua) is space devoid of matter. The word is derived from the Latin adjective vacuus (neuter vacuum) meaning "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure. Physicists often discuss ideal test results that would occur in a perfect vacuum, which they sometimes simply call "vacuum" or free space, and use the term partial vacuum to refer to an actual imperfect vacuum as one might have in a laboratory or in space. In engineering and applied physics on the other hand, vacuum refers to any space in which the pressure is considerably lower than atmospheric pressure. The Latin term in vacuo is used to describe an object that is surrounded by a vacuum. The process in which a mechanical device removes matter from a closed (such as a vacuum chamber) or open (such as a vacuum hose) system in an effort to create a vacuum is called evacuation. Evacuated substances captured, removed from the flowstream in another location, and held under vacuum are sometimes said to be collected by the vacuum system. The mechanical force the atmosphere exerts on air and material obstructing the flow of air into a vacuum is referred to as suction. The quality of a partial vacuum refers to how closely it approaches a perfect vacuum. Other things being equal, lower gas pressure means higher-quality vacuum. For example, a typical vacuum cleaner produces enough suction to reduce air pressure by around 20%. But higher-quality vacuums are possible.
Live Science reported that lead author of the study Matteo Borrini from Liverpool John Moores University stated: "these cannot be real bloodstains from a person who was crucified and then put into a grave, but actually handmade by the artist that created the shroud." In 2025 a study was published in the journal Archaeometry, by Brazilian digital graphics expert and 3D designer Cicero Moraes. Moraes used software to model how clothing would move on a three-dimensional human body compared to a low-relief sculpture. In Moraes’s experiments, the image produced when a cloth is draped over a 3D human model appears misshapen and distorted. This is called the Agamemnon Mask effect, named after the Mycenaean gold funerary mask. Moraes also found that the imprint made from a low-relief sculpture closely matched the image on the Turin shroud. This supports his conclusion that the image on the shroud was an artistic creation, which Moraes interpreted as being a funerary object and a "masterwork of Christian art."
Sources: en.wikipedia.org
=== Conversion to acyl halides === The hydroxyl group on carboxylic acids may be replaced with a chlorine atom using thionyl chloride to give acyl chlorides. In nature, carboxylic acids are converted to thioesters. Thionyl chloride can be used to convert carboxylic acids to their corresponding acyl chlorides. First, carboxylic acid 1 attacks thionyl chloride, and chloride ion leaves. The resulting oxonium ion 2 is activated towards nucleophilic attack and has a good leaving group, setting it apart from a normal carboxylic acid. In the next step, 2 is attacked by chloride ion to give tetrahedral intermediate 3, a chlorosulfite. The tetrahedral intermediate collapses with the loss of sulfur dioxide and chloride ion, giving protonated acyl chloride 4. Chloride ion can remove the proton on the carbonyl group, giving the acyl chloride 5 with a loss of HCl.
On the advice of his junior minister Lord Bellwin, a former leader of Leeds City Council, Heseltine ordered that nobody was to be hired without his personal approval. Heseltine instituted an internal audit system called "MINIS" ("management information system for ministers"), ironically, in Crick's view, as Heseltine's own company Haymarket had often been chaotically organised. Peter Hennessy likened it to "a Domesday Book". Heseltine personally interrogated the heads of department (many of whom felt he was interfering in internal civil service matters). The lengthy reports, showing organisation charts of each of the 66 directorates, expenditure, staff costs and forward plans, were made publicly available. Staff numbers were cut more deeply than in any other Whitehall department; one in twelve had gone within a year and nearly 30%, 15,000, by 1983; local government finance, under Terry Heiser, was the only department to receive extra resources. Thatcher was impressed by MINIS, and in February 1983 Heseltine was invited to give a presentation about them to other senior ministers and civil servants, in the hope that they might be adopted by other departments. There was little interest, but similar concepts were later adopted by Derek Rayner's Financial Management Initiative across Whitehall.
=== Co–Coo === Philip Cohen FRS (b. 1945). At the University of Dundee known primarily for work on protein phosphorylation and ubiquitinylation. Stanley Cohen (1922–2020). American biochemist at Vanderbilt University. Nobel Prize in Physiology or Medicine (1986). Edwin Joseph Cohn (1892–1953). American protein chemist at Harvard, known for studies on blood and the physical chemistry of protein. Author, with John Edsall of Proteins, Amino Acids and Peptides, a very influential book. Member Natl. Acad. Sci. USA. Mildred Cohn (1913–2009). American biochemist, at the University of Pennsylvania, pioneer in the use of nuclear magnetic resonance to study enzyme reactions. Waldo Cohn (1910–1999). American biochemist at Oak Ridge National Laboratory, known for developing techniques for separating isotopes. Linda Columbus (active from 2002). American chemist at the University of Virginia known for work on membrane proteins. Sidney Colowick (1916–1985). American biochemist at Vanderbilt University and founding editor of Methods in Enzymology. Member Natl. Acad. Sci. USA. Minor J. Coon (1921–2018). American biochemist at the University of Michigan, Ann Arbor, discoverer of 3-hydroxy-3-methylglutaryl-CoA.
Sources: en.wikipedia.org
Creatine monohydrate is the hydrated solid form of creatine, a nitrogen-containing compound involved in cellular energy metabolism. It consists of one creatine molecule associated with one water molecule in a crystal lattice.
No. Creatinine is a breakdown product formed when creatine loses water and cyclizes, and it is not the same compound. The two names are similar but refer to different chemical structures and roles.
The body synthesizes creatine from amino acids, mainly in the liver and kidneys. It also comes from animal foods such as meat and fish, while plant foods contain little or none.
Purity testing often uses high-performance liquid chromatography to measure creatine and creatinine. Water content can be checked by Karl Fischer titration. Additional tests may cover heavy metals, residual solvents, and microbial contamination.