This is a working overview of Creatine monohydrate, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-05-01 and is reviewed periodically as new material appears.
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.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C4H9N3O2·H2O | Creatine plus one water molecule in the crystal lattice. |
| Molar mass | 149.15 g/mol | Calculated for the monohydrate form. |
| Appearance | White crystalline powder | Typical solid form; particle size can vary by processing. |
| Solubility class | Sparingly soluble in water | Dissolution improves with time, stirring, and temperature. |
| Common synonyms | Creatine hydrate; N-carbamimidoyl-N-methylglycine monohydrate | Names vary by chemical registry and supplier. |
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 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.
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.
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.
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.
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.
== External links == Official website Advanced Drug Delivery Reviews, Interviews, http://media.journals.elsevier.com/content/files/addrmagazine-10132810.pdf https://bioscience.utah.edu/faculty/kopecek/index.php Kopeček] on bioscience.utah.edu
Although they are classically thought of working only together, GPCRs may signal through G-protein-independent mechanisms, and heterotrimeric G-proteins may play functional roles independent of GPCRs. GPCRs may signal independently through many proteins already mentioned for their roles in G-protein-dependent signaling such as β-arrs, GRKs, and Srcs. Such signaling has been shown to be physiologically relevant, for example, β-arrestin signaling mediated by the chemokine receptor CXCR3 was necessary for full efficacy chemotaxis of activated T cells. In addition, further scaffolding proteins involved in subcellular localization of GPCRs (e.g., PDZ-domain-containing proteins) may also act as signal transducers. Most often the effector is a member of the MAPK family.
SNX8 contains a PX domain in its N-terminus, which is located between amino acids 71 and 181. A homology domain with yeast's PX domain is localized between amino acids 75 and 178 within this same domain. As it is a phosphoinositide-binding domain, it is important to highlight amino acids 109, 135 and 148 as residues directly related to phosphatidylinositol 3-phosphate since being specific binding sites, constituting a phosphoinositid binding site with a span of 40 amino acids. Furthermore, it includes a pair of phosphorylable tyrosines in positions 95 and 126 that are key in its function in the IFNγ-triggered IKKβ-mediated noncanonical signaling pathway. Overall, the PX domain main function is to target SNX8 mainly to early endosomes and other membranes rich in phosphatidylinositol 3-phosphate phospholipids.
The protein content of C. vulgaris varies from 42 to 58% of its biomass dry weight. These proteins are considered as having a good nutritional quality compared to the standard profile for human nutrition of the World Health Organization and Food and Agriculture Organization, as the algae synthesizes amino acids. The algae also contains lipids (5–40% of the dry mass), carbohydrates (12–55% dry weight), and pigments including chlorophyll, reaching 1–2 % of the dry weight. Containing dietary minerals and vitamins, C. vulgaris is marketed as a dietary supplement, food additive, or food colorant. Extracted proteins have been investigated for manufacturing of emulsion and foams. It is not widely incorporated in food products due to its dark green color and smell similar to that of fish. As a dietary supplement, it may be sold as capsules, extracts, tablets or powder. Vitamin B12, specifically in the form of methylcobalamin, has been identified in Chlorella vulgaris.
Sources: en.wikipedia.org
On 15 June, US vice president JD Vance announced that the memorandum was digitally signed by both countries the previous day. On 17 June, Trump and Iranian president Masoud Pezeshkian signed the Islamabad Memorandum to end the war, with Trump signing it during dinner with French president Emmanuel Macron at the Palace of Versailles after the G7 summit. On 18 June, Pakistan stated that the signing of the memorandum implies Tehran will reopen the Strait of Hormuz "instantly" and the American blockade will end "immediately." CENTCOM announced that it had removed the naval blockade. On 19 June, Trump announced a renewed ceasefire between Israel and Hezbollah in the 2026 Lebanon war, facilitated by the US, Qatar, and Iran. However, on 20 June, Hezbollah announced an attack on Israeli forces trying to capture Ali al-Taher in Nabatieh, while Israel continued to strike southern Lebanon.
In countries with significant populations of individuals observing religions which place restrictions on material choices, vendors typically clarify the source of leather in their products. Such labeling helps facilitate religious observance, so that, for example, a Muslim will not accidentally purchase pigskin or a Hindu can avoid cattleskin. Such taboos increase the demand for religiously neutral leathers such as ostrich and deer. Jainism prohibits the use of leather, since it is obtained by killing animals, and Judaism forbids the comfort of wearing leather shoes on Yom Kippur, Tisha B'Av, and during mourning.
== Epidemiology == Nickel allergy is the most common contact allergy in industrialized countries, affecting around 8% to 19% of adults and 8% to 10% of children. Women are affected 4–10 times as frequently as men. Nickel allergy is estimated to affect 4% of men and 16% of women worldwide. In southern European countries, nickel allergy is more common than in northern countries, 16% versus 10%. The results are similar in the USA.
The UK government announces it will overhaul what it describes as the "feudal" leasehold system in England and Wales by the end of the current parliament. A security incident at Buchanan bus station in the centre of Glasgow leads to the evacuation of the area and anti-terror police being called out; around three men are arrested in connection with the incident. 22 November Ofgem announces the price of an average energy bill will rise by £21 a year from January 2025, with the typical household paying £1,738 per year; prices are now 50% higher than pre-COVID levels. Data from the Office for National Statistics shows a 0.7% fall in retail sales during October, with people holding back on spending ahead of the budget. Downing Street indicates that Israeli Prime Minister Benjamin Netanyahu would face arrest if he travelled to the UK following the issuing of an international arrest warrant for war crimes by the International Criminal Court. The Investigatory Powers Tribunal rules that 300 people affected by the Manchester Arena bombing cannot continue with a case against MI5 in which they alleged their human rights were breached because the security agency failed to take "appropriate measures" to prevent the attack. The UK government announces plans for new "respect orders" in England and Wales, giving police and local authorities the power to ban those who persistently practice antisocial behaviour from drinking in public places or from entering town centres, with prison sentences of up to two years for those who consistently break the orders.
== Research == Soft-tissue sarcoma research requires significant effort due to its rarity; successful research requires substantial collaboration. Year by year, the medical field is learning that the various types cannot be lumped together and each sarcoma needs to be considered a different type of cancer. As a novel form of treatment used in other cancers, immunotherapy may have a role in treating soft-tissue sarcomas like alveolar soft part sarcoma and pleomorphic undifferentiated sarcoma. However, as of 2023, only alveolar soft part sarcoma has a regulatory approval for such an agent, in this case atezolizumab.
Sources: en.wikipedia.org
In sports, the term performance-enhancing drugs is popularly used in reference to anabolic steroids or their precursors (hence the colloquial term steroids); anti-doping organizations apply the term broadly. Agencies such as the WADA and the United States Anti-Doping Agency try to prevent athletes from using these drugs by performing drug tests. When medical exemptions are granted they are called therapeutic use exemptions.
Carbon concentration in cement spans from ≈5% in cement structures to ≈8% in the case of roads in cement. Cement manufacturing releases CO2 in the atmosphere both directly when calcium carbonate is heated, producing lime and carbon dioxide, and also indirectly through the use of energy if its production involves the emission of CO2. The cement industry produces about 10% of global human-made CO2 emissions, of which 60% is from the chemical process, and 40% from burning fuel. A Chatham House study from 2018 estimates that the 4 billion tonnes of cement produced annually account for 8% of worldwide CO2 emissions. Nearly 900 kg of CO2 are emitted for every 1000 kg of Portland cement produced. In the European Union, the specific energy consumption for the production of cement clinker has been reduced by approximately 30% since the 1970s. This reduction in primary energy requirements is equivalent to approximately 11 million tonnes of coal per year with corresponding benefits in reduction of CO2 emissions. This accounts for approximately 5% of anthropogenic CO2. The majority of carbon dioxide emissions in the manufacture of Portland cement (approximately 60%) are produced from the chemical decomposition of limestone to lime, an ingredient in Portland cement clinker. These emissions may be reduced by lowering the clinker content of cement. They can also be reduced by alternative fabrication methods such as the intergrinding cement with sand or with slag or other pozzolan type minerals to a very fine powder.
=== Symptoms === Pain Paresthesia Spasticity, Hypertonia Muscular Dysfunction or Weakness Radiculopathy Although Tarlov Cysts can develop anywhere along the spine, they are most commonly symptomatic in the sacrum. Women are more likely to exhibit symptoms. They can also appear in clusters or bilaterally along the spine, thus symptoms can be unilateral, bilateral, or with symptoms more dominant on one side. The cases of reported symptomatic Tarlov cysts ranges from 15% to 30% of the overall reported Tarlov cyst cases, depending on the source of literature. Nevertheless, these cysts are important clinical entities because of their tendency to increase in size over time, potentially causing complications and eroding the surrounding bone tissue.
Before the infusions, participants received oral corticosteroids, histamine receptor blockers, and acetaminophen to reduce the risk of infusion-related reactions, which by themselves will cause several side effects.
Sources: en.wikipedia.org
Creatine is the base compound, while creatine monohydrate is a solid crystalline form that contains one water molecule per creatine molecule. Once dissolved, the monohydrate dissociates and releases creatine, which can participate in cellular energy metabolism. The monohydrate is the form most commonly used in research and commercial products.
Meat and fish contain creatine, and the human body also synthesizes it from amino acids. The monohydrate form is not a natural food ingredient as such; it is a manufactured crystalline solid that provides creatine after ingestion. Food sources contribute to total body creatine stores alongside endogenous synthesis.
It means the crystal lattice includes one molecule of water for each molecule of creatine. This water is part of the solid's ordered structure, not bulk moisture. The hydrate form influences properties such as solubility, density, and shelf stability.
In common usage, yes, but technically creatine monohydrate is one specific hydrated salt form. Other creatine forms exist and differ in composition and properties. The monohydrate is the most studied and most widely available grade.