Creatinine 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.
Updated 2026-06-27. Numbers and descriptions here follow the published literature rather than marketing material.
Commercial creatine monohydrate is typically manufactured through chemical synthesis, often starting from sarcosine and cyanamide. The resulting material is crystallized, washed, and dried to a specified hydrate content. Finished lots are tested for identity, purity, moisture, and heavy metals before release. Because the compound can cyclize to creatinine under heat or prolonged storage in solution, manufacturers control temperature and humidity during processing. The solid itself is relatively stable when kept dry and sealed, but moisture uptake can cause caking and complicate accurate assay.
Analytical laboratories commonly identify creatine monohydrate by high-performance liquid chromatography with ultraviolet detection, often after dissolving the sample in water or dilute acid. Ion-exchange or reversed-phase columns separate creatine from creatinine and related guanidino compounds. Nitrogen content can be checked by Kjeldahl or combustion methods, while moisture is measured by Karl Fischer titration or loss on drying. These techniques give complementary views: chromatographic purity addresses related substances, whereas moisture and elemental data confirm hydrate stoichiometry. No single test defines quality by itself; a combination is used in specifications.
In aqueous solution, creatine monohydrate undergoes a slow conversion to creatinine, a cyclized degradation product. This reaction is pH- and temperature-dependent, and it proceeds faster in warm or alkaline conditions. Because the conversion is gradual, analytical measurements of creatine in solution must account for time and storage history. The equilibrium favors creatinine more strongly at higher temperatures, which is relevant to sample handling in laboratories and to beverage formulations. Refrigeration slows but does not entirely stop this process.
Quality assessment of creatine monohydrate typically uses high-performance liquid chromatography to separate creatine from creatinine and other impurities. Other methods include nuclear magnetic resonance spectroscopy, titration, and infrared spectroscopy for identity confirmation. Purity is often reported as a percentage of the labeled compound on a dry basis, while moisture content is measured separately. Because different analytical methods have different selectivity, comparing purity values across sources requires attention to the method and sample preparation.
In dry solid form, creatine monohydrate is relatively stable when protected from moisture and heat. The crystal lattice includes water, and exposure to high humidity can cause caking or gradual changes in powder flow. Elevated temperatures may accelerate decomposition, particularly if moisture is present. Studies generally report that sealed, dry material retains acceptable purity for extended periods, although exact shelf life depends on packaging and storage conditions. Light exposure is not usually considered a major factor for this compound.
| Property | Value | Notes |
|---|---|---|
| Common analytical method | HPLC-UV | Separation from creatinine and related compounds. |
| Moisture content | Typically 12% theoretical | Monohydrate stoichiometry corresponds to about 12% water by mass. |
| Typical storage temperature | 15–25 °C | Cool, dry, sealed conditions limit moisture uptake. |
| Degradation marker | Creatinine | Formed by cyclization, especially in solution or with heat. |
| Solubility class | Moderately soluble in water | Solubility rises with temperature and varies with pH. |
In solid form, creatine monohydrate is relatively stable when kept dry and away from heat. Moisture and elevated temperatures promote cyclization into creatinine, a related compound with no role in the phosphagen system. Degradation accelerates in aqueous solution, where the conversion can occur within hours to days depending on pH and temperature. Manufacturers typically recommend storage in sealed containers at room temperature, with relative humidity below 50 percent. Long-term stability data for opened containers are limited.
Analytical methods for creatine monohydrate focus on identity, purity, and degradation products. High-performance liquid chromatography with ultraviolet detection is common, often at a wavelength near 210 nanometers. Titration and nuclear magnetic resonance spectroscopy can also quantify the parent compound. Pharmacopeial monographs specify tests for appearance, solubility, water content, and related substances, including creatinine. Purity values above 99 percent are typical for pharmaceutical-grade material, though supplement-grade products vary. Independent verification can detect label discrepancies.
Sourcing and verification of creatine monohydrate involve both manufacturing origin and third-party testing. Industrial production commonly starts with sarcosine and cyanamide, followed by crystallization to obtain the monohydrate. Some products are derived from animal sources, while others are synthesized from non-animal precursors. Certificates of analysis report assay, heavy metals, and microbial limits. Regulations differ by country: in the United States it is sold as a dietary supplement, whereas in the European Union it falls under food supplement rules.
Aryl nitriles can be synthesized via the Sandmeyer reaction of diazonium salts with copper(I) cyanide or by the Rosenmund-von Braun reaction (direct reaction of an aryl bromide with copper(I) cyanide). Conversion of thiocyanate with aromatic carboxylic acids, known as Letts nitrile synthesis, can be carried out using potassium thiocyanate; lead thiocyanate generally provides higher yields. Aryl iodides can be converted into aromatic nitriles under palladium catalysis with trimethylsilyl cyanide. For example, iodobenzene reacts with trimethylsilyl cyanide in the presence of tetrakis(triphenylphosphine)palladium(0) (Pd(PPh3)4) to form benzonitrile. Another palladium-catalyzed route (also employing Pd(PPh3)4) is the decarbonylation of aromatic acyl cyanides. Palladium-catalyzed cyanation of aryl chlorides with potassium cyanide or potassium hexacyanidoferrate(II) has likewise been reported. Quinones can react with trimethylsilyl cyanide to give silylated cyanohydrins, which are subsequently aromatized using phosphorus tribromide. A further approach involves reaction of aryl Grignard or aryllithium reagents with dimethylmalonitrile. Aromatic nitriles are often prepared in the laboratory from the aniline via diazonium compounds. This is the Sandmeyer reaction. It requires transition metal cyanides.
==== Sexuality ==== Hitchens was a supporter of gay rights. He opposed sodomy laws and supported same-sex marriage. He argued that the legalization of same-sex marriage was the "socialization of homosexuality" and "demonstrates the spread of conservatism" among the gay community. Hitchens was a genital integrity activist, strongly criticizing the tradition of both male circumcision and female genital mutilation. In accordance with his antitheism, Hitchens described the tolerance of metzitzah b'peh (a Jewish tradition of sucking blood from the penis after the removal of the male foreskin) as "another disgusting religious practice".
=== Biological properties === Chitosan is biodegradable and biocompatible. Chitosan enhances the transport of polar drugs across epithelial surfaces. The enhanced chitosan uptake is mainly due to the interaction of positively charged chitosan with cell membranes, activation of chlorine–bicarbonate exchange channels, and reorganization of proteins associated with epithelial tight junctions, thus opening epithelial tight junctions. However, it is not approved by the FDA for drug delivery. Purified quantities of chitosan are available for biomedical applications. Chitosan inhibits the growth of different bacteria and fungi by mechanisms involving several factors, including the degree of deacetylation, pH, divalent cations, and solvent type.
=== Differentiation from pituitary pars intermedia dysfunction === EMS shares similarities to pituitary pars intermedia dysfunction (also known as equine Cushing's disease), which also causes regional adiposity, laminitis, and sometimes insulin resistance. Treatment and management differ between the conditions, making it important to distinguish between the two. However, both diseases may occur simultaneously; horses with EMS may develop PPID.
Sources: en.wikipedia.org
== Metabolism == Levamisole is readily absorbed from the gastrointestinal tract and metabolized in the liver. Its time to peak plasma concentration is 1.5–2 hours. The plasma elimination half-life is fairly quick at 3–4 hours which can contribute to not detecting levamisole intoxication. The metabolite half-life is 16 hours. Levamisole's excretion is primarily through the kidneys, with about 70% being excreted over 3 days. Only about 5% is excreted as unchanged levamisole. Drug testing of racehorse urine has led to the revelation that among levamisole equine metabolites are both pemoline and aminorex, stimulants that are forbidden by racing authorities. Further testing confirmed aminorex in human and canine urine, meaning that both humans and dogs also metabolize levamisole into aminorex, though it is unclear whether plasma aminorex is present at any appreciable level. Blood samples following oral administration of levamisole out to 172 hr post-dose did not demonstrate any plasma aminorex levels above that of the limit of quantification (LoQ). Additionally, in cocaine-positive plasma samples, of which 42% contained levamisole, aminorex was never reported at concentrations higher than LoQ.
=== Molecular biology === Sequencing is used in molecular biology to study genomes and the proteins they encode. Information obtained using sequencing allows researchers to identify changes in genes and noncoding DNA (including regulatory sequences), associations with diseases and phenotypes, and identify potential drug targets.
== Casting choices == Tom Cruise, Johnny Depp, Brad Pitt, Nicolas Cage, Brandon Lee and Leonardo DiCaprio were approached for the role. Will Smith, who turned down the role to make Wild Wild West, later said he regretted the decision. Ewan McGregor was said to have been sent the script to the movie, but later turned it down and moved on to do Star Wars: Episode I – The Phantom Menace. Sandra Bullock was asked by the film's producers to star in the film, thus changing the gender of the character to female, only to receive a negative answer by Bullock.
Sources: en.wikipedia.org
The introduction of the F gene of SeV in the form of a plasmid into the tumor tissue in mice by electroporation showed that the expression of the F gene increases the T cell infiltration of the tumor with CD4+ and CD8+ cells and inhibits tumor growth. It was also shown in other similar experiments that cancer cells themselves, transfected with plasmids that encode viral membrane glycoproteins with fusion function, cause the collective death of neighboring cells forming syncytium with them. Recruitment of bystander cells into the syncytium leads to significant regression of the tumor.
=== Recreational use === As of 2021, lidocaine is not listed by the World Anti-Doping Agency as a substance whose use is banned in sport. It is used as an adjuvant, adulterant, and diluent to street drugs such as cocaine and heroin. It is one of the three common ingredients in site enhancement oil used by bodybuilders.
== See also == Lists of investigational drugs List of investigational generalized anxiety disorder drugs List of investigational social anxiety disorder drugs List of investigational panic disorder drugs List of investigational post-traumatic stress disorder drugs
"It hurt me greatly to call it [the radio station] Radio Nacional Islas Malvinas, and I used to try to avoid referring to Port Stanley as Puerto Argentino. I called it 'the capital' or the 'largest settlement on the island'"
Sources: en.wikipedia.org
Laboratories typically combine chromatographic separation with moisture and elemental analysis. High-performance liquid chromatography can quantify creatine and related substances such as creatinine. Moisture methods confirm the hydrate form and help detect excess water.
The dry crystalline solid is relatively stable when protected from moisture and heat. In solution, it can convert to creatinine over time, especially at higher temperatures. Storage conditions and product form influence the rate of change.
Moisture uptake can cause particles to stick together, particularly in humid conditions or after opening a container. Clumping does not necessarily mean the creatine has degraded. It can make accurate measuring more difficult, so dry storage and sealed packaging are used.
Dry, sealed creatine monohydrate can remain stable for years, but storage conditions affect its shelf life. Moisture, heat, and repeated opening of containers can reduce quality over time.