If you have been reading about guanidinoacetate 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 2025-11-29. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
Recommended storage usually involves a sealed container kept at room temperature, away from direct sunlight and moisture. High humidity can cause caking, which changes flow properties and may complicate accurate weighing. Repeated opening of containers exposes the powder to air and moisture, so smaller aliquots can reduce handling effects. Storage temperature ranges are not absolute requirements; they reflect conditions that slow degradation and preserve consistent physical characteristics. Clean, dry tools help prevent contamination during sampling.
| 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 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.
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.
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.
== Description == This clade circumscribes five subordinate clades: two traditional tribes (Hypocalypteae and Indigofereae) and three informal clades (the mirbelioids, the millettioids, and Hologalegina), as well as several minor taxa. The name of this clade is informal and is not assumed to have any particular taxonomic rank like the names authorized by the ICBN or the ICPN. The clade does not currently have a node-based definition.
The UK also condemned the execution of Farzad Bazoft, a journalist working for the British newspaper The Observer. Following Saddam's declaration that "binary chemical weapons" would be used on Israel if it used military force against Iraq, Washington halted part of its funding. A UN mission to the Israeli-occupied territories, where riots had resulted in Palestinian deaths, was vetoed by the US, making Iraq deeply skeptical of US foreign policy aims in the region, combined with the reliance of the US on Middle Eastern energy reserves.
The enzyme-linked immunosorbent assay (ELISA) (, ) is a commonly used analytical biochemistry assay, first described by Eva Engvall and Peter Perlmann in 1971. The assay is a solid-phase type of enzyme immunoassay (EIA) to detect the presence of a ligand (commonly a protein) in a liquid sample using antibodies directed against the ligand to be measured. ELISA has been used as a diagnostic tool in medicine, plant pathology, and biotechnology, as well as a quality control check in various industries. In the most simple form of an ELISA, antigens from the sample to be tested are attached to a surface. Then, a matching antibody is applied over the surface so it can bind the antigen. This antibody is linked to an enzyme, and then any unbound antibodies are removed. In the final step, a substance containing the enzyme's substrate is added. If there was binding, the subsequent reaction produces a detectable signal, most commonly a color change. Performing an ELISA involves at least one antibody with specificity for a particular antigen. The sample with an unknown amount of antigen is immobilized on solid support (usually a polystyrene microtiter plate) either non-specifically (via adsorption to the surface) or specifically (via capture by another antibody specific to the same antigen, in a "sandwich" ELISA). After the antigen is immobilized, the detection antibody is added, forming a complex with the antigen. The detection antibody can be covalently linked to an enzyme or can itself be detected by a secondary antibody that is linked to an enzyme through bioconjugation.
=== Autonomic neuropathy === During hypoglycemia, the body normally releases epinephrine (more commonly known as adrenaline) and related substances. This serves two purposes: The β-effect of epinephrine is responsible for the palpitations and tremors, giving the patient warning that hypoglycemia is present. The β-effect of epinephrine also stimulates the liver to release glucose (gluconeogenesis and glycogenolysis). In other words, the epinephrine warns the patient that hypoglycemia is present and signals the liver to release glucose to reverse it. In the absence of epinephrine release, or when it is attenuated (reduced) during hypoglycemia, the patient may not be aware that his/her glucose level is low. This is termed 'hypoglycemic unawareness'. The problem is compounded since, in the absence of an appropriate epinephrine response, the usual responses of glycogenolysis and gluconeogenesis may also be lost or blunted. Since epinephrine release is a function of the autonomic nervous system, the presence of autonomic neuropathy (i.e., a damaged autonomic nervous system) will cause the epinephrine release in response to hypoglycemia to be lost or blunted. Unfortunately, damage to the autonomic nervous system in the form of autonomic neuropathy is a common complication of long-standing diabetes (especially type 1 diabetes), so the presence of hypoglycemic unawareness may be a sign of autonomic neuropathy, although the autonomic response to hypoglycemia is already impaired in patients with type 1 diabetes mellitus even in the absence of autonomic neuropathy.
After the Japanese surrender in 1945, the CCP continued to use the National Revolutionary Army unit structures, until the decision was made in February 1947 to merge the Eighth Route Army and New Fourth Army. On October 10, 1947, the "Manifesto of the Chinese People's Liberation Army" was published, renaming the new million-strong force the People's Liberation Army (PLA). The reorganization was completed by late 1948. The PLA eventually won the Chinese Civil War, establishing the People's Republic of China in 1949.
Sources: en.wikipedia.org
A breakthrough in understanding the flow of blood through the heart and body came with the publication of De Motu Cordis (1628) by the English physician William Harvey. Harvey's book completely describes the systemic circulation and the mechanical force of the heart, leading to an overhaul of the Galenic doctrines. Otto Frank (1865–1944) was a German physiologist; among his many published works are detailed studies of this important heart relationship. Ernest Starling (1866–1927) was an important English physiologist who also studied the heart. Although they worked largely independently, their combined efforts and similar conclusions have been recognized in the name "Frank–Starling mechanism". Although Purkinje fibers and the bundle of His were discovered as early as the 19th century, their specific role in the electrical conduction system of the heart remained unknown until Sunao Tawara published his monograph, titled Das Reizleitungssystem des Säugetierherzens, in 1906. Tawara's discovery of the atrioventricular node prompted Arthur Keith and Martin Flack to look for similar structures in the heart, leading to their discovery of the sinoatrial node several months later. These structures form the anatomical basis of the electrocardiogram, whose inventor, Willem Einthoven, was awarded the Nobel Prize in Medicine or Physiology in 1924. The first heart transplant in a human ever performed was by James Hardy in 1964, using a chimpanzee heart, but the patient died within 2 hours.
The bite is immediately followed by the local pain of a burning character; the limb soon swells and becomes discolored, and within one to three hours great prostration, accompanied by vomiting, and often diarrhea, sets in. Cold, clammy perspiration is usual. The pulse becomes extremely feeble, and slight dyspnoea and restlessness may be seen. In severe cases, which occur mostly in children, the pulse may become imperceptible and the extremities cold; the patient may pass into coma. In from twelve to twenty-four hours these severe constitutional symptoms usually pass off; but in the meantime, the swelling and discoloration have spread enormously. The limb becomes phlegmonous and occasionally suppurates. Within a few days recovery usually occurs somewhat suddenly, but death may result from the severe depression or from the secondary effects of suppuration. That cases of death, in adults as well as in children, are not infrequent in some parts of the Continent is mentioned in the last chapter of this Introduction. The Viperidae differ much among themselves in the toxicity of their venoms. Some, such as the Indian Russell's viper (Daboia russelli) and saw-scaled viper (E. carinatus); the American rattlesnakes (Crotalus spp.), bushmasters (Lachesis spp.), and lanceheads (Bothrops spp.); and the African adders (Bitis spp.), night adders (Causus spp.), and horned vipers (Cerastes spp.), cause fatal results unless a remedy is speedily applied.
== Nutrition == Shimeji mushrooms contain minerals like potassium and phosphorus, magnesium, zinc, and copper. Shimeji mushrooms lower the cholesterol level of the body. This mushroom is rich in glycoprotein (HM-3A), marmorin, beta-(1-3)-glucan, hypsiziprenol, and hypsin therefore is a potential natural anticancer agent. Shimeji mushrooms contain angiotensin I-converting enzyme (ACE) inhibitor which is an oligopeptide that may be helpful in lowering blood pressure and reducing the risk of stroke in persons having hypertension. Also rich in polysaccharides, phenolic compounds, and flavonoids. Therefore, inhibits inflammatory cytokines and oxidative stress and protects from lung failure. These compounds also help in reducing oxidative stress-mediated disease through radical scavenging activity hence these mushrooms are antioxidants also.
While most historians trace its origins to the period immediately following World War II, others argue that it began with the October Revolution in Russia in 1917 when the Bolsheviks took power. In 1919 Lenin stated that his new state was surrounded by a "hostile capitalist encirclement", and he viewed diplomacy as a weapon that should be used in order to keep the Soviet Union's enemies divided. He began with a new Communist International ("Comintern"), based in Moscow, which was designed to plan for revolutionary upheavals abroad. It was ineffective—Communist uprisings all failed in Germany, Hungary and elsewhere. Historian Max Beloff argues that the Soviets saw "no prospect of permanent peace", with the 1922 Soviet Constitution proclaiming:
Sources: en.wikipedia.org
== Research == Magnesium sulfate has been used as an experimental treatment of Irukandji syndrome caused by envenomation by certain species of Irukandji jellyfish, but the efficacy of this treatment remains unproven.
=== 1990 === January 19–20: Soviet troops kill at least 131 Azerbaijanis for demonstrating for independence in Baku. January 30: the Polish United Workers' Party is dissolved, allowing democracy to be restored in Poland. January 31: U.S. Operation Just Cause ends, and Operation Promote Liberty begins in Panama. February 12–14: The Dushanbe riots occurred in Tajikistan. March 11: Lithuania declares independence from the Soviet Union. March 21: South Africa give de jure independence to South West Africa (Namibia). April 3: The Bulgarian Communist Party, the ruling party of Bulgaria, is dissolved. May 22: Both North Yemen and South Yemen unified. May 29: Boris Yeltsin is elected as the president of Russia. Yeltsin would serve as Russia's president until resigning on December 31, 1999, with Vladimir Putin taking over. May 30: The Washington Summit begins. June 12: Russia issues the Declaration of Sovereignty but never officially declares its independence from the Soviet Union. With the declaration, it declares that the laws and constitution of the Russian Soviet Federated Socialist Republic (RSFSR) to be above those of the Soviet Union. The loss of the RSFSR which was the most powerful of all the Soviet republics is a major blow to the Soviet Union. August 2: Ba'athist Iraq invades Kuwait, igniting the Gulf War. August 20: Estonia declares independence from the Soviet Union. August 23: Armenia declares independence from the Soviet Union. September 9: George H. W.
== Further reading == Wang, Juan; Li, Yuan Zhi; Chen, Ren Ren; Bao, Jin Yong; Yang, Gong Ming (January 2007). "Comparison of volatiles of banana powder dehydrated by vacuum belt drying, freeze-drying and air-drying". Food Chemistry. 104 (4): 1516. doi:10.1016/j.foodchem.2007.02.029. von Meysenbug, L.; Fine, Archie (May 1936). "Banana powder and the fecal flora of infants". The Journal of Pediatrics. 8 (5): 630. doi:10.1016/S0022-3476(36)80163-2.
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.