This is a working overview of creatinine, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
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.
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.
Handling practices aim to limit moisture uptake and thermal exposure. Containers should stay closed when not in use, and storage areas should avoid direct sunlight, strong heat, and high humidity. Caking can occur when powder absorbs water, even if the creatine itself has not fully degraded. Aqueous stock solutions are best prepared fresh when needed because they are less stable than the solid. Open questions include how different excipients, packaging materials, and climate conditions affect long-term stability across global supply chains.
Solid creatine monohydrate is relatively stable when kept dry and sealed, but heat and moisture accelerate its conversion to creatinine. This degradation involves intramolecular cyclization, a process that removes water and forms a less useful compound for phosphocreatine metabolism. Powder stored under cool, dry conditions can remain within specification for extended periods, though exact shelf life depends on packaging, humidity, and initial purity. Aqueous solutions degrade faster than dry powder, with pH and temperature influencing the rate. Because degradation is gradual, analytical testing is used to confirm potency at manufacture and during stability studies.
| 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 |
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.
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.
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.
=== Antihypertensive medicines === Amlodipine Bisoprolol Enalapril Hydralazine Hydrochlorothiazide Lisinopril/amlodipine (lisinopril + amlodipine) Lisinopril/hydrochlorothiazide (lisinopril + hydrochlorothiazide) Losartan Methyldopa Perindopril/amlodipine/indapamide (perindopril + amlodipine + indapamide) Telmisartan/amlodipine (telmisartan + amlodipine) Telmisartan/hydrochlorothiazide (telmisartan + hydrochlorothiazide) Valsartan/amlodipine/hydrochlorothiazide (valsartan + amlodipine + hydrochlorothiazide) Complementary:
== Multi-chain polymerization == A monomer with functionality 3 has 3 functional groups that participate in the polymerization. This will introduce branching in a polymer and may ultimately form a cross-linked macrostructure. The point at which this three-dimensional 3D network is formed is known as the gel point, signaled by an abrupt change in viscosity. A more general functionality factor fav is defined for multi-chain polymerization, as the average number of functional groups present per monomer unit. For a system containing N0 molecules initially and equivalent numbers of two function groups A and B, the total number of functional groups is N0fav.
Crutzen (1933–2021), Dutch chemist, winner of the 1995 Nobel Prize in Chemistry for work on atmospheric chemistry, especially in relation to ozone Ana Maria Cuervo (born 1966), Spanish-American physician, researcher, and cell biologist, best known for work on autophagy Marie Curie (1867–1934), Polish and French radiation physicist, discovered the elements radium and polonium, 1903 Nobel Prize in Physics, 1911 Nobel Prize in Chemistry Pierre Curie (1859–1906), French physicist and chemist, 1903 Nobel Prize in Physics for work on radioactivity Robert Curl (1933–2022), American chemist, winner of 1996 Nobel Prize in Chemistry for discovery of the fullerene class of materials Theodor Curtius (1857–1928), German chemist known for the Curtius rearrangement, and also discovery of diazoacetic acid, hydrazine and hydrazoic acid Anthony Czarnik (born 1957), American chemist and inventor known for work on fluorescent chemosensors Emil Czyrniański (1824–1888), Polish chemist, known for developing chemical nomenclature in Polish
Gene defects in the leptin gene (ob) are rare in human obesity. As of July 2010, only 14 individuals from five families have been identified worldwide who carry a mutated ob gene (one of which was the first ever identified cause of genetic obesity in humans)—two families of Pakistani origin living in the UK, one family living in Turkey, one in Egypt, and one in Austria—and two other families have been found that carry a mutated ob receptor. Others have been identified as genetically partially deficient in leptin, and, in these individuals, leptin levels on the low end of the normal range can predict obesity. Several mutations of genes involving the melanocortins (used in brain signaling associated with appetite) and their receptors have also been identified as causing obesity in a larger portion of the population than leptin mutations.
Several studies have quantified the amounts of hallucinogenic compounds found in the fruit bodies of Psilocybe semilanceata. In 1993, Gartz reported an average of 1% psilocybin (expressed as a percentage of the dry weight of the fruit bodies), ranging from a minimum of 0.2% to a maximum of 2.37% making it one of the most potent species (but significantly less potent than panaeolus cyanescens). In an earlier analysis, Tjakko Stijve and Thom Kuyper (1985) found a high concentration in a single specimen (1.7%) in addition to a relatively high concentration of baeocystin (0.36%). Smaller specimens tend to have the highest percent concentrations of psilocybin, but the absolute amount is highest in larger mushrooms. A Finnish study assayed psilocybin concentrations in old herbarium specimens, and concluded that although psilocybin concentration decreased linearly over time, it was relatively stable. They were able to detect the chemical in specimens that were 115 years old. Michael Beug and Jeremy Bigwood, analyzing specimens from the Pacific Northwest region of the United States, reported psilocybin concentrations ranging from 0.62% to 1.28%, averaging 1.0 ±0.2%. They concluded that the species was one of the most potent, as well as the most constant in psilocybin levels. In a 1996 publication, Paul Stamets defined a "potency rating scale" based on the total content of psychoactive compounds (including psilocybin, psilocin, and baeocystin) in 12 species of Psilocybe mushrooms.
Sources: en.wikipedia.org
The party under Xi announced a raft of legal reforms at the fourth plenum held in the fall 2014, and he called for "Chinese socialistic rule of law" immediately afterwards. The party aimed to reform the legal system, which had been perceived as ineffective at delivering justice and affected by corruption, local government interference and lack of constitutional oversight. The plenum, while emphasizing the absolute leadership of the party, also called for a greater role of the constitution in the affairs of state and a strengthening of the role of the National People's Congress Standing Committee in interpreting the constitution. It also called for more transparency in legal proceedings, more involvement of ordinary citizens in the legislative process, and an overall "professionalization" of the legal workforce. The party also planned to institute cross-jurisdictional circuit legal tribunals as well as giving provinces consolidated administrative oversight over lower level legal resources, which is intended to reduce local government involvement in legal proceedings. There have been several reforms to the court system under Xi, including transferring the authority over local court finance and personnel from local governments to the provincial-level, establishing a personnel quota system, emphasizing "lifetime accountability" for judges for their judicial decisions, and specification of case transferring procedures between various courts. In 2014, China started efforts to pass a unified Civil Code, which was eventually adopted in 2020.
Drive to improve quality of patient care Need to contain burgeoning healthcare costs Improve accessibility and portability of patient records Better source data for epidemiological studies Before health records can be successfully communicated and stored there must be a fundamental agreement on the definition for each individual piece of information. Terminology solutions for describing such "concepts" currently include (but are not limited to) SNOMED CT, LOINC and the NPU. Key benefits conferred by the NPU terminology include:
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The colonies of Queensland and South Australia along with the Northern Territory, where three of the four states of colonial Australia which still had large, yet unknown numbers of Aboriginal people living on Country in regional, remote and very remote locations. From time to time, this made in necessary for laws to be created so Australian’s living within the colony understood their responsibilities to society, and the law was working to ensure protection from potential exploitation, perceived or otherwise. By 1897 the passage of law in all three of the above locations had restricted the sale, exchange or trade of opium with any Aboriginal person without exception, this broad application was required to ensure the law was enforceable. Hardening of Canadian attitudes toward Chinese opium users and fear of a spread of the drug into the white population led to the effective criminalization of opium for nonmedical use in Canada between 1908 and the mid-1920s. In 1909, the International Opium Commission was founded, and by 1914, 34 nations had agreed that the production and importation of opium should be diminished. In 1924, 62 nations participated in a meeting of the commission. Subsequently, this role passed to the League of Nations, and all signatory nations agreed to prohibit the import, sale, distribution, export, and use of all narcotic drugs, except for medical and scientific purposes.
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.
Keep it in a sealed container in a cool, dry place away from direct heat and moisture. Dry powder is more stable than prepared solutions.