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.
Last reviewed on 2026-02-22. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 (monohydrate) | C4H11N3O3 | Includes one water molecule per creatine unit. |
| Molecular weight | 149.15 g/mol | Calculated for the monohydrate; anhydrous creatine is 131.13 g/mol. |
| Appearance | White crystalline powder | Odorless; particle size can vary by manufacturing. |
| CAS Registry Number | 6020-87-7 | Identifies creatine monohydrate; creatine base is 57-00-1. |
| Common synonyms | Creatine hydrate; methylguanidoacetic acid monohydrate | Naming varies by registry and supplier. |
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.
Solid creatine monohydrate is generally stable when kept cool and dry, but it can hydrolyze to creatinine over time. Moisture, heat, and acidic conditions accelerate this conversion, which reduces assay values and changes the material's properties. Creatinine is a cyclic dehydration product that is also a normal human metabolite, so its presence in a sample is not necessarily a health concern by itself. In quality testing, creatinine is monitored as a marker of degradation and purity.
Identity and purity are assessed with several complementary methods. High-performance liquid chromatography can separate creatine from creatinine and related impurities, often with ultraviolet detection. Nuclear magnetic resonance and infrared spectroscopy provide structural confirmation, while Karl Fischer titration measures water content. Elemental analysis and mass spectrometry may be used for additional confirmation, especially in research or forensic settings. No single method captures every quality attribute, so laboratories typically combine results and compare them against a specification.
== See also == Americanization Anti-American sentiment American stereotypes Cocacolonization Cultural imperialism Debates over Americanization Military globalization McDonaldization Pax Americana Sovietization Sovietization of the Baltic states Soviet socialist patriotism United States in the 1950s
== Twelve-Day War == Following the outbreak of the Twelve-Day War, Trump stated that he needed to leave to control the United States's response to the conflict, which meant that he sidelined some scheduled meetings with world leaders. On 16 June 2025, G7 leaders said: "We affirm that Israel has a right to defend itself. We reiterate our support for the security of Israel. Iran is the principal source of regional instability and terror."
=== Non-human infection === Treponema pallidum has been found in non-human primates in multiple different geographical regions. In Tanzania specifically, T. pallidum geographical distribution closely aligns with the distribution of yaws in humans. The most common strains in NHPs are T. p. pertenue and T. p.endemicum. It is unclear however whether or not these NHP strains can naturally infect humans, but flies have been proposed as possible vectors in an alternative transmission route. Clinically, these infections range from asymptomatic to severe skin ulceration that affect the face or genitalia in these primates. Infection of NHPs is largely reliant on ecological patterns, behaviors, and interactions between the species. There are no current treatments available for infected NHPs.
=== Chemiluminescence === This technology is based on the luminescence of specific compounds when they bind to explosive particles. Its sensitivity can reach the nanogram (ppb) level. It can be applied in non-electronic formats, such as sprays and test papers, as well as in electronic devices.
==== Other actions ==== Aside from its actions at the muscarinic acetylcholine receptors, xanomeline has relatively high affinity for certain other targets, such as various serotonin receptors. It acts specifically as a partial agonist of the serotonin 5-HT1A receptor, as an agonist of the serotonin 5-HT1B receptor, and as an antagonist of the serotonin 5-HT2A, 5-HT2B, and 5-HT2C receptors. Xanomeline may inhibit CYP3A4 and P-glycoprotein locally in the intestines, but does not inhibit them systemically.
Sources: en.wikipedia.org
In 2007 a 10-year-old male Dalmatian dog was described with acromegalic signs such as an enlarged tongue and head, widened interdental space, and thickening of skin; along with other signs of hypersomatotropism such as polyphagia, obesity, and stridor. Insulin levels were heightened and the dog had glucose intolerance; however, the dog was not diabetic as blood glucose levels were found to be normal after multiple tests. Levels of IGF-1 and growth hormone were heightened. CT imaging showed a pituitary mass which was later confirmed to be an acidophilic adenoma stained for growth hormone; however, mammary tumour-induced acromegaly is rare with few reported cases. Hypothyroidism can increase levels of growth hormone and IGF-1 in dogs. Some of the physical changes in dogs with hypothyroidism may be due to increased growth hormone concentration.
== Clinical significance == Identification of the submucosa plays an important role in diagnostic and therapeutic endoscopy, where special fibre-optic cameras are used to perform procedures on the gastrointestinal tract. Abnormalities of the submucosa, such as gastrointestinal stromal tumors, usually show integrity of the mucosal surface. The submucosa is also identified in endoscopic ultrasound to identify the depth of tumours and to identify other abnormalities. An injection of dye, saline, or epinephrine into the submucosa is imperative in the safe removal of certain polyps. Endoscopic mucosal resection involves removal of the mucosal layer, and in order to be done safely, a submucosal injection of dye is performed to ensure integrity at the beginning of the procedure. Female uterine submucosal layers are liable to develop fibroids during pregnancy and are often excised upon discovery.
The following outline is provided as an overview of and topical guide to exercise: Exercise – any bodily activity that enhances or logs physical fitness and overall health and wellness. It is performed for various reasons including strengthening muscles and the cardiovascular system, honing athletic skills, weight loss or maintenance, as well as for the purpose of enjoyment. Frequent and regular physical exercise boosts the immune system, and helps prevent the "diseases of affluence" such as heart disease, cardiovascular disease, Type 2 diabetes, and obesity.
Japanese centenarians receive a silver cup and a certificate from the prime minister of Japan upon the Respect for the Aged Day following their 100th birthday, honouring them for their longevity and prosperity in their lives. In Madhya Pradesh, India, the award known as Shatayu Samman is given out to people who live at least 100 years to promote awareness of good health. North Korean centenarians receive a birthday congratulatory letter from the Supreme Leader of the DPRK. On 6 July 2022, Pak Hak Sil, a centenarian living in Koup-ri of Kangnam County, Pyongyang, received a birthday letter sent by Kim Jong Un. In the Philippines, Republic Act No. 10868 better known as the Centenarians Act of 2016 mandates that all living Filipinos residing in the Philippines or overseas receive a birthday congratulatory letter from the President of the Philippines and a ₱100,000 "Centenarian Gift" from the Department of Social Welfare and Development (DSWD). In Taiwan, people aged 100 or above receive a golden pendant necklace on Chong Yang Festival each year from the president and Ministry of Health and Welfare. Mahathir Mohamad became the first prime minister of Malaysia to reach the age of 100 on 10 July 2025. His wife, Siti Hasmah, reached the age of 100 on 12 July 2026; before passing away two months later due to heart failure.
Sources: en.wikipedia.org
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.
Yes. Meat, fish, and other animal tissues contain creatine. Cooking can convert some creatine to creatinine, which has no role in phosphocreatine energy buffering. Plant foods contain little or no creatine.
Creatinine is a cyclic breakdown product formed from creatine and phosphocreatine. It is filtered by the kidneys and commonly measured in blood and urine as a marker of renal function. Creatine monohydrate is a supplement ingredient and research chemical, not the same 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.