creatine is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-04-26. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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. Its systematic name is N-(aminoiminomethyl)-N-methylglycine monohydrate, and it appears as a white, odorless powder with limited solubility in water. The monohydrate is the most common solid form used in research and commercial products because it is stable under dry conditions. The anhydrous form lacks the water of crystallization and differs slightly in molar mass. Both forms participate in the same biochemical reactions once dissolved.
In the body, creatine is synthesized from the amino acids arginine, glycine, and methionine, primarily in the liver and kidneys. It is transported to muscle and other tissues, where it is phosphorylated to phosphocreatine by creatine kinase. This phosphagen system provides a rapid source of adenosine triphosphate during short, intense contractions. Dietary creatine comes mainly from meat and fish, and the body's total pool is influenced by both synthesis and intake.
As a supplement, creatine monohydrate is studied for its effects on muscle performance and recovery. The compound is often described as an ergogenic aid, meaning it may support physical work capacity. Research typically compares it with placebo or other forms, such as citrate or nitrate, under controlled conditions. Questions remain about the optimal dose and long-term effects in different populations, and findings are not uniform across all studies. The monohydrate form remains the most extensively tested.
| 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 |
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leucine zipper (ZIP) A common structural motif in DNA-binding transcription factors and some other types of proteins, approximately 35 amino acids in length, characterized chiefly by the recurrence of the amino acid leucine every seven residues. When modeled in an idealized alpha-helical conformation, the leucine residues are positioned in such a way that they can interdigitate with the same or similar motifs in an alpha helix belonging to another similar polypeptide, facilitating dimerization and the formation of a complex resembling a zipper.
As the bombings and mining of North Vietnam were being carried out, Nixon, and even more so Kissinger, waited anxiously for the Soviet reaction and, much to their relief, received only the standard statement decrying the American action and a diplomatic note complaining that American aircraft had bombed a Soviet freighter in Haiphong harbor. The Moscow summit was not cancelled.
Sources: en.wikipedia.org
==== United States ==== Diazepam is controlled as a Schedule IV substance. The states of California and Florida offer diazepam to condemned inmates as a pre-execution sedative as part of their lethal injection program. The state of California has not executed a prisoner since 2006. In August 2018, Nebraska used diazepam as part of the drug combination used to execute Carey Dean Moore, the first death row inmate executed in Nebraska in over 21 years.
Peukert argued for an integrated view of Nazi Germany with the social policies to encourage "healthy Aryan" families to have more children, the "social racism" that saw the bodies of "healthy Aryan" women as belonging to the volksgemeinschaft, the effort to sterilize "anti-social families" and the extermination of Jews and Romany as part and parcel of the same project. Likewise, Peukert argued that Nazi Germany was not some freakish "aberration" from the norms of Western civilization, as he noted that the ideas about eugenics and racial superiority that the National Socialists drew upon were widely embraced throughout the Western world. In the same way, Peukert noted in Inside Nazi Germany as part of his argument against the "freakish aberration" view of the Nazi era that homosexual sex had been made illegal in Germany with Paragraph 175 in 1871 and all the Nazis did with the 1935 version of Paragraph 175 was to make it tougher, as the 1935 version of Paragraph 175 made being homosexual in and of itself a criminal offense, whereas the 1871 version of Paragraph 175 had only made homosexual sex a criminal offense. Peukert also noted against the "freakish aberration" view of Nazi Germany that the 1935 version of Paragraph 175 stayed on the statute books in West Germany until 1969 as it was considered to be a "healthy law", leading to German homosexuals who survived the concentration camps continuing to be convicted all through the 1950s and 1960s under exactly the same law that sent them to the concentration camps under the Third Reich.
As a result, Singapore has increasingly used polders for reclamation works, a method most notably used at Tekong Island in which an area is enclosed and then pumped dry. The country is projected to reclaim roughly another 100 km2 (40 sq mi) by 2040, which includes major projects such as Tuas Port, the Long Island project located south of East Coast Park for commercial and residential developments, and an aviation park at Changi Bay.
A special form of clubbing is hypertrophic pulmonary osteoarthropathy (HPOA), known in continental Europe as Pierre Marie-Bamberger syndrome. This is the combination of clubbing and thickening of periosteum (connective tissue lining of the bones) and synovium (lining of joints), and is often initially diagnosed as arthritis. It is commonly associated with lung cancer.
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.
It is a compound made of creatine bound to one water molecule. It appears as a white crystalline powder and is the most common solid form of creatine used in research and supplements.