creatine kinase comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2025-09-23. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Creatine monohydrate is one of several solid forms of creatine described in the literature. Other forms include anhydrous creatine, creatine hydrochloride, and creatine ethyl ester, each with different solubility and stability characteristics. The monohydrate is distinct from creatinine, a spontaneous breakdown compound that forms when creatine loses water and cyclizes. Commercial descriptions sometimes use synonyms such as methylguanidoacetic acid or N-(aminoiminomethyl)-N-methylglycine, which refer to the same base molecule. These names appear in chemical databases and product labels.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C4H9N3O2·H2O | Monohydrate; anhydrous base is C4H9N3O2 |
| Molar mass | 149.15 g/mol | Calculated for the monohydrate form |
| Appearance | White crystalline powder | Typical laboratory and food-grade material |
| Solubility in water | Sparingly soluble at room temperature | Solubility increases with temperature |
| Common synonyms | Methylguanidoacetic acid; N-(aminoiminomethyl)-N-methylglycine | Synonyms refer to the creatine base, not the hydrate specifically |
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.
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.
== History == The use of iboga in African spiritual ceremonies was first reported by French and Belgian explorers in the 19th century, beginning with the work of French naval physician and explorer of Gabon Marie-Théophile Griffon du Bellay. The first botanical description of the Tabernanthe iboga plant was made in 1889. Ibogaine was first isolated from T. iboga in 1901 by Dybowski and Landrin and independently by Haller and Heckel in the same year using T. iboga samples from Gabon. Complete synthesis of ibogaine was accomplished by G. Büchi in 1966. Since then, several other synthesis methods have been developed. Use of low doses of ibogaine (e.g. 10–30 mg/day) as a stimulant and "anti-fatigue" drug in the treatment of conditions like "cardiac atony", neurasthenia, and convalescence was advocated by French researchers in 1905. From the 1930s to 1960s, ibogaine was sold in France as Lambarène, an extract of the Tabernanthe manii plant, and promoted as a mental and physical stimulant. It was formulated at doses of 200 mg extract containing low doses of 4 to 8 mg ibogaine per tablet. The drug enjoyed some popularity among post-World War II athletes. Lambarène was withdrawn from the market in 1966 when the sale of ibogaine-containing products became illegal in France. Another formulation was Iperton, which contained Tabernanthe iboga extract 40 mg per dose unit. In 2008, Mačiulaitis and colleagues stated that in the late 1960s, the World Health Assembly classified ibogaine as a "substance likely to cause dependency or endanger human health". The U.S.
== Medical uses == Tividenofusp alfa is indicated for the treatment of neurologic manifestations of Hunter syndrome (mucopolysaccharidosis type II) when initiated in presymptomatic or symptomatic children weighing at least 5 kg (11 lb) prior to advanced neurologic impairment. Hunter syndrome is a rare inherited lysosomal disorder in which sugar molecules called glycosaminoglycans build up within the cells' lysosomes. This substrate accumulation affects physical and mental development by causing abnormalities in the skeleton, heart, respiratory system, brain, and other organs.
The death penalty response by Shanmugam during the BBC interview was well-received and supported by many members of the public on social media, who also voiced their support for capital punishment for drugs in Singapore. In light of the execution of Abdul Rahim Shapiee (and his accomplice), Pritam Singh, opposition leader of Parliament and chairman of Workers' Party, wrote to Singapore newspaper Today to express his support for the death penalty for drug crimes in Singapore and the execution of drug traffickers. Singh nonetheless argued that there should be changes made to rectify the shortcomings in determining the extent of one's cooperation with the authorities during investigations before sentencing, citing cases of traffickers receiving death sentences before courts decided they were couriers and could sentence them for life, as well as cases like Abdul Rahim's, who was sentenced to death despite being a courier and having provided substantive assistance. Singh also expressed concern about the need to curb the frequent abuse of court processes by drug traffickers and their lawyers. The Ministry of Home Affairs (MHA) revealed that from 2013 to early 2022, certificates of substantive assistance were issued to 82 out of 104 drug traffickers regardless of nationality, while there were 14 out of the remaining 22 sentenced to death and the other eight traffickers sentenced to life imprisonment due to mental illnesses.
Sources: en.wikipedia.org
== History == In 1934, medical researchers Karl Meyer and John Palmer, scientists at Columbia University in New York, found that one of the chief functions of hyaluronic acid is maintaining skin volume and hydration, along with other body maintenance functions and tasks. Meyer and Palmer first isolated the substance from the eye of a cow and named hyaluronic acid by combining the Greek word for glass—hyalos—and the uronic sugar contained in hyaluronic acid. Hyaluronic acid later found uses in the baking and food industry in the 1940s and, by the 1990s, found its way into the medical field for use in joint pain, treating wounds, eye surgery and, finally, in 1996, for facial tissue augmentation in Europe.
Grizard, G; Sion, B; Bauchart, D; Boucher, D (31 March 2000). "Separation and quantification of cholesterol and major phospholipid classes in human semen by high-performance liquid chromatography and light-scattering detection". Journal of Chromatography B: Biomedical Sciences and Applications. 740 (1): 101–7. doi:10.1016/S0378-4347(00)00039-6. PMID 10798299. SUNY Podcast – Semen study results Hyena, Hank (August 21, 2000). "The quest for sweet semen". Salon.
== Evaluation of the quality of QSAR models == QSAR modeling produces predictive models derived from application of statistical tools correlating biological activity (including desirable therapeutic effect and undesirable side effects) or physico-chemical properties in QSPR models of chemicals (drugs/toxicants/environmental pollutants) with descriptors representative of molecular structure or properties. QSARs are being applied in many disciplines, for example: risk assessment, toxicity prediction, and regulatory decisions in addition to drug discovery and lead optimization. Obtaining a good quality QSAR model depends on many factors, such as the quality of input data, the choice of descriptors and statistical methods for modeling and for validation. Any QSAR modeling should ultimately lead to statistically robust and predictive models capable of making accurate and reliable predictions of the modeled response of new compounds. For validation of QSAR models, usually various strategies are adopted:
Sources: en.wikipedia.org
=== Origins and Controversy === The original work seen on eSimoa was done by David R. Walt's team at Harvard University, who published their work in 2020. However, the claim to the development of the technology is contested by Chi-An Cheng at National Taiwan University (NTU) in 2023 and 2024, who has claimed that her team developed the technology.
== Related compounds == The naphthoquinones lawsone methyl ether and methylene-3,3'-bilawsone are some of the active compounds in Impatiens balsamina leaves. Juglone is a structural isomer used as a brown dye. Atovaquone is a synthetic antimicrobial agent that can be manufactured from lawsone.
Won the Banff best Popular Science award 15 September A Very British Bomb, with interviews with Eddie Howse and John Challens who worked with William Penney at Fort Halstead; Dennis Ginns, reactor design engineer; featured Christopher Hinton (of ICI); Harold Disney of supply; Hinton decided to build the plant at Windscale; Sir John Hill worked on a computer; Tom Tuohy managed the piles; David Deverell was a senior chemical engineer; the core would be made at the new site of Aldermaston, a former RAF airfield; Air Marshal Sir John Rowlands took the two plutonium cores on an Avro Lincoln; Bill Hall, later Professor of Nuclear Engineering from 1959 at the University of Manchester; scientists travelled to Australia on HMS Campania (D48).
== Other interests == Monaghan is an active member of the British Mass Spectrometry Society and has been given life membership for making a significant contribution to the practice of mass spectrometry in the UK. In 2003 the BMSS made John its first President with responsibility to promote the work done by the Society, particularly on the international stage and beyond the core MS community. Monaghan has also been a member and president of the Peterloo Speakers Club in Manchester. He is also a keen cricketer and football referee.
Sources: en.wikipedia.org
Creatine monohydrate is the hydrated solid form of creatine, a nitrogen-containing compound involved in cellular energy metabolism. It consists of one creatine molecule associated with one water molecule in a crystal lattice.
No. Creatinine is a breakdown product formed when creatine loses water and cyclizes, and it is not the same compound. The two names are similar but refer to different chemical structures and roles.
The body synthesizes creatine from amino acids, mainly in the liver and kidneys. It also comes from animal foods such as meat and fish, while plant foods contain little or none.
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.