Everything below concerns monohydrate. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-06-21. Where a claim depends on a specific study, the study is described rather than over-claimed.
The compound was identified in the nineteenth century after chemists isolated a nitrogenous substance from meat extracts. Later work established its role in muscle energy metabolism and its conversion to phosphocreatine. Chemical synthesis of creatine followed, and industrial production made the monohydrate widely available as a purified powder. Interest expanded in the late twentieth century when researchers began studying creatine supplementation and muscle physiology. Historical accounts sometimes differ on exact dates and attributions, but the broad sequence from tissue extracts to synthetic production is well documented.
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 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.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C4H9N3O2·H2O | Monohydrate includes one water molecule per creatine molecule |
| Molar mass | 149.15 g/mol | Value for the monohydrate; anhydrous creatine is about 131.13 g/mol |
| Appearance | White crystalline powder | Odorless or nearly odorless in purified form |
| Solubility in water | About 13 g/L at 25 °C | Solubility increases with temperature and varies with pH |
| Common synonyms | Creatine hydrate; N-(aminoiminomethyl)-N-methylglycine | Monohydrate distinguishes it from anhydrous creatine |
Analytical methods for creatine monohydrate focus on identity, purity, and degradation products. High-performance liquid chromatography with ultraviolet detection is common, often at a wavelength near 210 nanometers. Titration and nuclear magnetic resonance spectroscopy can also quantify the parent compound. Pharmacopeial monographs specify tests for appearance, solubility, water content, and related substances, including creatinine. Purity values above 99 percent are typical for pharmaceutical-grade material, though supplement-grade products vary. Independent verification can detect label discrepancies.
Sourcing and verification of creatine monohydrate involve both manufacturing origin and third-party testing. Industrial production commonly starts with sarcosine and cyanamide, followed by crystallization to obtain the monohydrate. Some products are derived from animal sources, while others are synthesized from non-animal precursors. Certificates of analysis report assay, heavy metals, and microbial limits. Regulations differ by country: in the United States it is sold as a dietary supplement, whereas in the European Union it falls under food supplement rules.
In solid form, creatine monohydrate is relatively stable when kept dry and away from heat. Moisture and elevated temperatures promote cyclization into creatinine, a related compound with no role in the phosphagen system. Degradation accelerates in aqueous solution, where the conversion can occur within hours to days depending on pH and temperature. Manufacturers typically recommend storage in sealed containers at room temperature, with relative humidity below 50 percent. Long-term stability data for opened containers are limited.
The term creatine monohydrate is often shortened to creatine in casual usage, though other creatine forms exist, including citrate, nitrate, and hydrochloride salts. These alternative forms differ in solubility, pH behavior, and the amount of creatine delivered per unit mass. Regulatory categories vary by country: some jurisdictions treat it as a food ingredient, while others place it under supplement or drug frameworks depending on claims and presentation. Standard reference texts list it as a naturally occurring nitrogenous organic acid rather than a vitamin or mineral.
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 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.
Commercial creatine monohydrate is typically a white to off-white powder with low odor. It is commonly sold as a fine powder, micronized powder, or larger crystals, but these are physical forms of the same chemical. Purity grades vary, and products may contain small amounts of related substances such as creatinine, dicyandiamide, or moisture. The monohydrate is often selected for supplements and research because its production is well established and its behavior in water is predictable. Analytical certificates usually report assay, loss on drying, and heavy metals.
Supercritical fluid extraction has been used in determining hydrocarbon components in water. Processes that use sCO2 to produce micro and nano scale particles, often for pharmaceutical uses, are under development. The gas antisolvent process, rapid expansion of supercritical solutions, and supercritical antisolvent precipitation (as well as several related methods) process a variety of substances into particles. Due to its ability to selectively dissolve organic compounds and assist enzyme functioning, sCO2 has been suggested as a potential solvent to support biological activity on Venus- or super-Earth-type planets.
== Drug interaction == The administration of cisplatin and vitamin B12 concomitantly does not modify the pharmacokinetics of the pemetrexed. It was recently shown that pemetrexed may play a role in cisplatin resistance in lung cancer by increasing the expression of Orai3 calcium channels as well as the expression of certain ABC transporters like MDR1 and MRP-5 responsible for cisplatin efflux and therefore a reduction of the effect of cisplatin As current therapies are based on the co-administration of pemetrexed and cisplatin, there may be interactions between pemetrexed and cisplatin, including a reduction in the therapeutic effects of cisplatin caused by pemetrexed.
== Further reading == Paradise for Sale: A Parable of Nature. McDaniel and Gowdy. "Christmas Island". Fact sheet 157. National Archives of Australia. 2013. Archived from the original on 4 February 2014. Retrieved 18 January 2014. Weeramantry C. Nauru: environmental damage under international trusteeship. Melbourne: Oxford University Press; 1992. Williams M, Macdonald BK. The phosphateers: a history of the British Phosphate Commissioners and the Christmas Island Phosphate Commission. Carlton, Vic: Melbourne University Press; 1985. Albert Fuller Ellis 1935. Ocean Island and Nauru – their story. Angus and Robertson Limited
Sources: en.wikipedia.org
Primary processes involve initial charge separation through absorption of photons by the matrix and pooling of the energy to form matrix ion pairs. Primary ion formation occurs through absorption of a UV photon to create excited state molecules by
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== Protein–DNA interactions == Protein–DNA interactions occur when a protein binds a molecule of DNA, often to regulate the biological function of DNA, usually the expression of a gene. Among the proteins that bind to DNA are transcription factors that activate or repress gene expression by binding to DNA motifs and histones that form part of the structure of DNA and bind to it less specifically. Also proteins that repair DNA such as uracil-DNA glycosylase interact closely with it. In general, proteins bind to DNA in the major groove; however, there are exceptions. Protein–DNA interactions are of mainly two types, either specific interaction, or non-specific interaction. Recent single-molecule experiments showed that DNA binding proteins undergo rapid rebinding in order to bind in correct orientation for recognizing the target site.
Sources: en.wikipedia.org
Narrated by Henrietta Bess, produced by Nicholas Kent, directed by Peter Webber 19 July What Shall We Do with the Moon?, shown thirty years after the 1969 Moon landing; about colonization of the Moon; Greg Bennett (writer); the Apollo 17 mission, in December 1972; Alan Binder, who worked on the January 1998 Lunar Prospector, which discovered water on the Moon; Jim Benson and his SpaceDev at Poway, California; the Thunderbird proposal of Starchaser Industries; the Nomad rover, developed by Carnegie Mellon University in Pittsburgh; chemist Nigel Packham of NASA; physicist David Criswell, and solar power on the Moon. Narrated by Scottish actress Daniela Nardini, produced by Katrina Phillips, directed by Chris Durlacher, made by Wall to Wall Television. Shown on the Discovery Science (European TV channel) 6 September Frozen Hearts, up to 50% of people on a heart-lung machine have some form of brain deterioration, and for one in five, the deterioration is permanent Alan Egar had heart surgery, but he had memory difficulties after the operation; he found difficulty finishing sentences; in the US four-year-old Samantha Summers is put on a heart-lung machine at Boston Children's Hospital; David Eckmann, later the Horatio C.
== Mechanism of action == After the venom has entered the body via the wasp sting, it enters the bloodstream, where it will be diluted in the blood and distributed through the organism. Pompilidotoxins target the sodium channels, so the toxin reaches its target sites via the distribution by the bloodstream. Research by Sahara et.al. (2000) has suggested that α-PMTX might slow or block the conformational changes that are necessary for the fast inactivation of voltage gated sodium channels. This causes the intracellular sodium concentration to increase. They hypothesise that this effect could be caused by the α-PMTX binding to similar elements of the neurotoxin receptor site 3 on the extracellular surface of the sodium channel. α-PMTX also enhances both the inhibitory postsynaptic potentials (IPSPs) and the excitatory postsynaptic potentials (EPSPs). The eventual paralysis of the spider is caused by the prolonged membrane depolarization, which is induced by the EPSPs. However, when the fast inactivation is slowed or blocked by channel blocker like PMTX, the membrane will not repolarize properly, but stay in a depolarized state instead. The long-lasting depolarisation leads to paralysis. A study by Konno et.al. (2001) has found that the positively charged amino acids in β-PMTX likely bind to the Glu-1616 site on the D4S3-S4 loop of the sodium channel. This indicates that the positive charges of PMTXs are a crucial part of the toxins, as they are likely involved in the electrostatic bonding between the toxin and the sodium channel.
SPPS is limited by reaction yields due to the exponential accumulation of by-products, and typically peptides and proteins in the range of 40 or 50 amino acid residues are pushing the limits of synthetic accessibility of SPPS products as homogeneous molecules of defined chemical structure. Synthetic difficulty also is sequence dependent; typically aggregation-prone sequences such as amyloids are difficult to make. Longer peptides can be accessed by using approaches such as native chemical ligation, where two unprotected synthetic peptides can be covalently condensed in aqueous solution.
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Sources: en.wikipedia.org
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.
Creatine monohydrate contains creatine, but the two terms are not strictly interchangeable. The monohydrate includes water in the crystal, while creatine refers to the base molecule. Other creatine forms pair the molecule with different acids or carriers.
Dietary creatine is found mainly in meat and fish. The human body also synthesizes creatine from amino acids in the liver, kidneys, and pancreas. The monohydrate powder used in products is manufactured rather than extracted directly from food.
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.