This is a working overview of Creatine hydrate, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-09-20 and is reviewed periodically as new material appears.
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.
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.
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.
| 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 |
Stability studies examine how creatine monohydrate changes under controlled temperature and humidity. The solid is generally stable when kept dry, but moisture can promote hydrolysis to creatinine, especially in solution or at elevated temperatures. Color, odor, and assay values are monitored over time to detect degradation. Because degradation pathways depend on storage conditions, shelf-life claims should specify the tested packaging, temperature, and humidity. Open questions remain about the long-term behavior of different crystal habits and particle sizes.
Regulatory treatment of creatine monohydrate varies by country and intended use. In some jurisdictions it is sold as a dietary supplement, while in others it may be treated as a food ingredient or a pharmaceutical raw material. Pharmacopeial monographs, where available, define identification, assay limits, and impurity thresholds. Manufacturers often follow these monographs or internal specifications to ensure batch-to-batch consistency. Analytical method validation is important because different methods can yield different apparent purity values if sample preparation or detection conditions are not controlled.
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.
In November 1993, relator Robert Marena, an SKB employee, filed a qui tam action against GlaxoSmithKline in the United States District Court for the Eastern District of Pennsylvania. His complaint contained eight separate claims under the False Claims Act. Merena's complaint alleged that SKB had defrauded the government by, inter alia, billing for tests that were not performed, double billing, paying illegal kickbacks to health care professionals, and adding tests to "automated chemistry" profiles and then separately billing for those tests. After a month, relator Glenn Grossenbacher, an attorney, filed a second qui tam action against GlaxoSmithKline in the United States District Court for the Western District of Texas. Relators Kevin Spear, Jack Dowden, and the Berkeley Community Law Center (collectively, "the Spear relators") followed in February 1995 with a suit in the Northern District of California. The courts in Texas and California transferred these actions to the Eastern District of Pennsylvania for consolidation with the Merena case. After Merena's action was filed, the government commenced an investigation into a series of new claims that were not part of its original investigation. At the same time, the government continued to pursue the original "automated chemistry" investigation that it had begun after the 1992 settlement with National Health Laboratories. Later in August 1995, the government began formal settlement negotiations with GlaxoSmithKline.
The problem of minimizing ET is an NP-hard problem. Even though the class of problems is NP-hard, in practice many instances of protein design can be solved exactly or optimized satisfactorily through heuristic methods.
== Clinical Relevance == MMP-13 has long been a protein of interest in the context of osteoarthritis and rheumatoid arthritis. The role of MMP-13 has also been thoroughly examined in atherosclerosis, specifically in potentially reducing the collagen content of the fibrous cap.
Dizziness and somnolence are the most frequent side effects. Fatigue, ataxia, peripheral edema (swelling of extremities), and nystagmus are also common. A 2017 meta-analysis found that gabapentin also increased the risk of difficulties in mentation and visual disturbances as compared to a placebo. Gabapentin is associated with a weight gain of 2.2 kg (4.9 lb) after 1.5 months of use. Case studies indicate that it may cause anorgasmia and erectile dysfunction, as well as myoclonus that disappear after discontinuing gabapentin or replacing it with other medication. Fever, swollen glands that do not go away, eyes or skin turning yellow, unusual bruises or bleeding, unexpected muscle pain or weakness, rash, long-lasting stomach pain which may indicate an inflamed pancreas, hallucinations, anaphylaxis, respiratory depression, and increased suicidal ideation are rare but serious side effects.
== Contraindications == Abatacept has not been tested in pregnant women and it is not known if it is secreted in breast milk; it causes birth defects in rodents when given in very high doses, and is transmitted in rodent breast milk. Abatacept will likely interfere with any vaccine given while people are taking it. It should not be used in combination with anakinra or TNF antagonists. Because abatacept, anakinra, and TNF antagonists suppress the immune system, using them in combination may significantly increase the risk for severe infections.
Sources: en.wikipedia.org
=== Regulation of fatty acid synthesis === Acetyl-CoA is formed into malonyl-CoA by acetyl-CoA carboxylase, at which point malonyl-CoA is destined to feed into the fatty acid synthesis pathway. Acetyl-CoA carboxylase is the point of regulation in saturated straight-chain fatty acid synthesis, and is subject to both phosphorylation and allosteric regulation. Regulation by phosphorylation occurs mostly in mammals, while allosteric regulation occurs in most organisms. Allosteric control occurs as feedback inhibition by palmitoyl-CoA and activation by citrate. When there are high levels of palmitoyl-CoA, the final product of saturated fatty acid synthesis, it allosterically inactivates acetyl-CoA carboxylase to prevent a build-up of fatty acids in cells. Citrate acts to activate acetyl-CoA carboxylase under high levels, because high levels indicate that there is enough acetyl-CoA to feed into the Krebs cycle and produce energy. High plasma levels of insulin in the blood plasma (e.g. after meals) cause the dephosphorylation and activation of acetyl-CoA carboxylase, thus promoting the formation of malonyl-CoA from acetyl-CoA, and consequently the conversion of carbohydrates into fatty acids, while epinephrine and glucagon (released into the blood during starvation and exercise) cause the phosphorylation of this enzyme, inhibiting lipogenesis in favor of fatty acid oxidation via beta-oxidation.
== Educational research == Industrialist John D. Rockefeller was instrumental in establishing the General Education Board (GEB), of which he maintained expenditure control. The GEB adopted his beliefs, promoting vocational education across a 5-decade span. The Rockefeller Foundation, like the Carnegie Corporation, supported early educational broadcasting and the participation of commercial radio, vis-à-vis education-only stations. It explored radio's educational effectivity in both classroom and adult settings and explored methods to share those results. Via GEB dispersals the Rockefeller Foundation provided financial support for Wisconsin's and Ohio's early School of the Air experiments, among other educational project recipients. The Foundation's interest in broadcasting as a tool subsequently led to communication research, e.g. how radio "could be used for public edification, control, and pacification", promoting university-level social science studies. The social engineering success of these early social scientists led to social sciences becoming institutionalized with Rockefeller Foundation's influence leading the transformation.
microvillus A small, slender, tubular cytoplasmic projection, generally 0.2–4 micrometres long and 0.1 micrometres in diameter, protruding from the surface of some animal cells and supported by a central core of microfilaments. When present in large numbers, such as on epithelial cells lining the respiratory and alimentary tracts, they form a dense brush border which presumably serves to increase each cell's absorptive surface area.
Zverev's next breakthrough came during the grass court season at the Halle Open, where he upset world No. 3 Roger Federer in the semifinals, ending Federer's streak of ten consecutive appearances in the final while competing at the tournament. He was also the first teenager to defeat Federer since Murray nearly a decade earlier. Nonetheless, he finished runner-up at the event to veteran compatriot Florian Mayer. After this final, he entered the top 30 for the first time and stayed ranked in the 20s for the rest of the season. Despite being seeded at a major tournament for the first time, Zverev could then only match his best major singles result at Wimbledon, again falling to Berdych. During the US Open Series, he reached the semifinals of the Washington Open, but lost his opening round matches at both Masters events. He was then upset in the second round of the US Open by Dan Evans. After the US Open, Zverev returned to Europe and won his first career ATP title at the St. Petersburg Open. He recorded his first win over No. 9 Berdych in the semifinals, and No. 3 Stan Wawrinka in the final, coming back from 0–3 down in the third set. At his next event, he then defeated No. 10 Thiem in the first round of the 2016 China Open for the first time in four tries this year. In doing so, Zverev became the first teenager to record three consecutive victories against top ten opponents since Boris Becker in 1986. Zverev's third round appearance at the Shanghai Masters then helped him rise to No.
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.
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.