This is a working overview of creatine, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-12-09. Anything still debated is marked as such rather than presented as settled.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Typical storage temperature | 15–25 °C | Cool, dry, sealed container; avoid heat |
| Relative humidity | Low; keep below about 60% | Moisture promotes caking and degradation |
| Primary degradation product | Creatinine | Forms by cyclization, especially in solution |
| Common assay method | HPLC with UV or RI detection | Separates creatine from creatinine and related impurities |
| Moisture content | Typically reported as percentage | Measured by Karl Fischer titration or loss on drying |
The metabolome refers to the complete set of small-molecule (<1.5 kDa) metabolites (such as metabolic intermediates, hormones and other signaling molecules, and secondary metabolites) to be found within a biological sample, such as a single organism. The word was coined in analogy with transcriptomics and proteomics; like the transcriptome and the proteome, the metabolome is dynamic, changing from second to second. Although the metabolome can be defined readily enough, it is not currently possible to analyse the entire range of metabolites by a single analytical method. In January 2007, scientists at the University of Alberta and the University of Calgary completed the first draft of the human metabolome. The Human Metabolome Database (HMDB) is perhaps the most extensive public metabolomic spectral database to date and is a freely available electronic database (www.hmdb.ca) containing detailed information about small molecule metabolites found in the human body. It is intended to be used for applications in metabolomics, clinical chemistry, biomarker discovery and general education. The database is designed to contain or link three kinds of data:
== History == Fremanezumab was discovered and developed by Rinat Neuroscience, was acquired by Pfizer in 2006, and was then licensed to Teva. It was approved by the US Food and Drug Administration in September 2018. In March 2019, fremanezumab was approved for marketing and use in the European Union.
In collaboration with the team at the Lawrence Livermore National Laboratory (LLNL) in Livermore, California, United States, they made an attempt on element 114 (which was predicted to be a magic number, closing a proton shell, and more stable than element 113). In 1998, the JINR–LLNL collaboration started their attempt on element 114, bombarding a target of plutonium-244 with ions of calcium-48:
=== World War II === From the start of World War II in 1939, German ships used the gap to break out from their bases in northern Germany (and from occupied Norway after April 1940) with a view to attacking Allied shipping convoys, but Allied blocking efforts in the North Sea and in the GIUK gap impeded such break-outs. British forces occupied the Faroe Islands in April 1940, and Iceland in May 1940; the United States took over effective control of Greenland in 1940. But the German Kriegsmarine profited greatly from the fall of France in June 1940, after which German submarines could operate from bases on the French coast. The origin of the term "gap" dates to this period, when there was a gap in air coverage known as the Mid-Atlantic gap or the "Greenland air gap". This gap was an area that land-based aircraft could not reach and where, as a result, they could not carry out their anti-submarine duties.
Sources: en.wikipedia.org
== Novel == The Picture of Dorian Gray (1890/1891) was Wilde's only complete novel. The first version of "The Picture of Dorian Gray" was published, in a form highly edited by the magazine, as the lead story in the July 1890 edition of Lippincott's Monthly Magazine. Wilde published the longer and revised version in book form in 1891, with an added preface. The Uncensored Picture of Dorian Gray was published by the Belknap Press of Harvard University Press in 2012.
== See also == Iran and weapons of mass destruction Catholic peace traditions Christian pacifism Christianity and violence Just war theory Peace churches Reactions to the 2026 Iran war Regime change efforts in the 2026 Iran war Analysis of the 2026 Iran war Use of religious language and symbolism in the Gaza war
The open spaces of areolar connective tissue, a type of loose connective tissue Areolae (diatom), pores in the silica shell of diatoms Areole, a raised structure bearing spines on cacti Areola (lichen), a round to polygonal part of a surface of a crustose lichen Areola (entomology), a small ring of color or gap in wing margin of insects- see the Glossary of entomology terms. Areola, the open space created by higher venation of a leaf - see the Glossary of botanical terms
Sources: en.wikipedia.org
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.
Creatine can lose a water molecule and cyclize into creatinine, especially in aqueous solution and at elevated temperatures. This is a chemical degradation process rather than microbial spoilage.
High-performance liquid chromatography is commonly used to quantify creatine and detect creatinine. Identity can be confirmed with spectroscopy or other instrumental methods.
Creatine is the base compound, while creatine monohydrate is a solid crystalline form that contains one water molecule per creatine molecule. Once dissolved, the monohydrate dissociates and releases creatine, which can participate in cellular energy metabolism. The monohydrate is the form most commonly used in research and commercial products.