The short version of Creatine monohydrate fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-07-17. Anything still debated is marked as such rather than presented as settled.
Analytical laboratories commonly use high-performance liquid chromatography to separate creatine from creatinine and related impurities. Ion chromatography, nuclear magnetic resonance, and titration assays can also quantify the compound. Water content is measured by Karl Fischer titration or loss on drying, because the monohydrate has a defined theoretical water fraction. Particle size, bulk density, and flowability are physical properties that affect blending and capsule filling. These measurements support quality control and help verify that a lot matches its specification.
Regulatory status varies by country. In the United States, creatine monohydrate is sold as a dietary supplement ingredient, while in the European Union it is placed on the market as a food supplement component. Some jurisdictions have established purity monographs or permitted health claims, while others treat it as a novel food or require notification. Product labels may state the amount of creatine monohydrate or the equivalent creatine content, and the two figures can differ. Independent testing programs sometimes check identity, potency, and contaminant limits.
Creatine monohydrate is stable under dry, cool conditions but can degrade when exposed to moisture and heat. In solution, it undergoes hydrolysis to creatinine, a cyclic derivative with little role in phosphagen energy transfer. The rate of conversion increases with temperature, storage time, and acidic or alkaline pH. Solid material kept in a sealed container at room temperature generally retains its composition for extended periods. Moisture uptake is a primary concern because it can accelerate breakdown and caking.
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.
Quality control for creatine monohydrate typically combines identity, assay, and impurity tests. High-performance liquid chromatography with ultraviolet detection is common for separating creatine from creatinine and related substances. Nuclear magnetic resonance and infrared spectroscopy can confirm molecular structure, while titration may assess acid-base content. Moisture content, heavy metals, residual solvents, and microbial limits are checked according to applicable standards. These tests help distinguish compliant material from powders that have degraded, been diluted, or contain manufacturing residues.
| Property | Value | Notes |
|---|---|---|
| Typical storage temperature | 15-25 °C | Sealed container; protect from moisture and direct heat. |
| Theoretical water content | About 12.1% | One water molecule per creatine molecule. |
| Primary degradation product | Creatinine | Formed by cyclization, especially in aqueous solution. |
| Common analytical method | HPLC-UV | Used to separate creatine from creatinine and related impurities. |
| Regulatory classification (U.S.) | Dietary supplement ingredient | Other jurisdictions may classify it as a food supplement or novel food depending on rules. |
Stability studies examine how creatine monohydrate changes under controlled temperature and humidity. The solid is generally stable when kept dry, but moisture can promote hydrolysis to creatinine, especially in solution or at elevated temperatures. Color, odor, and assay values are monitored over time to detect degradation. Because degradation pathways depend on storage conditions, shelf-life claims should specify the tested packaging, temperature, and humidity. Open questions remain about the long-term behavior of different crystal habits and particle sizes.
Regulatory treatment of creatine monohydrate varies by country and intended use. In some jurisdictions it is sold as a dietary supplement, while in others it may be treated as a food ingredient or a pharmaceutical raw material. Pharmacopeial monographs, where available, define identification, assay limits, and impurity thresholds. Manufacturers often follow these monographs or internal specifications to ensure batch-to-batch consistency. Analytical method validation is important because different methods can yield different apparent purity values if sample preparation or detection conditions are not controlled.
Commercial creatine monohydrate is typically a white to off-white powder with low odor. It is commonly sold as a fine powder, micronized powder, or larger crystals, but these are physical forms of the same chemical. Purity grades vary, and products may contain small amounts of related substances such as creatinine, dicyandiamide, or moisture. The monohydrate is often selected for supplements and research because its production is well established and its behavior in water is predictable. Analytical certificates usually report assay, loss on drying, and heavy metals.
Creatine monohydrate is a crystalline compound formed from creatine and one water molecule in its solid lattice. Creatine itself is a nitrogen-containing organic acid involved in energy transfer in muscle and other tissues. The monohydrate form is the most common solid form used in research and commercial products because it is stable and easy to handle. The term "monohydrate" refers to the fixed one-to-one ratio of water to creatine in the crystal, not to moisture content. This distinction matters when comparing labels or calculating creatine content.
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.
Ankylosing spondylitis (AS) is a type of arthritis from the disease spectrum of axial spondyloarthritis. The term comes from the Greek ankylos meaning crooked, curved or rounded, spondylos meaning vertebra, and -itis meaning inflammation. It is characterized by long-term inflammation of the joints of the spine, typically where the spine joins the pelvis. Lower back pain is a hallmark, but eye and gastrointestinal problems and arthritis of other joints may also occur. Joint mobility in the affected areas often worsens over time, though the progression of symptoms varies significantly. Ankylosing spondylitis is believed to involve a combination of genetic and environmental factors. More than 90% of people affected in the UK have a specific human leukocyte antigen known as the HLA-B27 antigen, though the genetic correlation varies across populations (e.g., only 70% of AS patients in Turkey are HLA-B27 positive). The underlying mechanism is believed to be autoimmune or autoinflammatory. Diagnosis is based on symptoms with support from medical imaging and blood tests. AS is a type of seronegative spondyloarthropathy, meaning that tests show no presence of rheumatoid factor (RF) antibodies. As of 2019, there is no cure for AS. Treatments may include medication, physical therapy, and surgery. Medication therapy focuses on relieving the pain and other symptoms of AS, as well as stopping the disease progression by counteracting long-term inflammatory processes. Commonly used medications include NSAIDs, TNF inhibitors, IL-17 antagonists, and DMARDs.
Many new features for tandem mass analysis were gradually revealed by using the digital ion trap. Ions can be selectively removed from the ion trap by boundary ejection simply by varying the duty cycle of the digital waveform, instead of applying the conventional "resolving DC" voltage. Since rectangular waveforms are employed in the DIT, electrons can be injected into the trap during one of the voltage level without being accelerated up by the varying electric field. This enabled Electron-capture dissociation, which needs very low energy electron beam to interact with the trapped ions, achieved in the digital ion trap, without assistance of a magnetic field. Other forms of digital ion trap were also developed, including the linear ion trap constructed using printed circuit boards and the rods structure linear ion guide/trap. Two sets of switch circuitry were normally used to generate 2 phases of rectangular pulse waveform for two pairs of rods in case of the linear digital ion trap.
Edge noted in 2003 that "a significant number of the 7.5m copies of the PC version were bought because the game offered such potential for community-driven expansion". As of November 16, 2004, eight million copies had been sold, and by 2008, 9.3 million copies had been sold at retail. Guinness World Records awarded Half-Life the world record for Best-Selling First-Person Shooter of All Time (PC) in 2008.
== Actinide partitioning: complexation mechanism == The selective separation of actinides from the PUREX raffinate by advanced processes needs new extracting agents, which must possess a more pronounced affinity towards actinides over lanthanides and other products mostly present in the acidic fuel dissolution. The design and the synthesis of efficient extracting agents rely on a deep knowledge of the complexation mechanism involved in the extraction process. Moreover, the structure and the stability of the ligand complexes with An(III) and Ln(III) upon extraction process, and the ligand selectivity need to be investigated. Research is being devoted to design more N-donor extracting agents, which show promising selectivity towards actinides.
=== Provincial–municipal relations === In September 2018, Ford announced that he would use the Canadian Charter of Rights and Freedoms' "notwithstanding" clause to override the ruling of a Superior Court judge which said that Ford's legislation, decreasing the size of Toronto City Council just before the municipal election, was unconstitutional. As Ontario's AG, Mulroney voted in support of the Ford government's use of Section 33 of the Canadian Charter of Rights and Freedoms. According to the Globe and Mail, "constitutional experts and politicians of all parties" criticized her decision as a violation of the sanctity of the judicial process as Attorney General. In October 2020, the Ford government passed the Supporting Ontario’s Recovery Act, 2020, which included a section that banned municipalities in the province from using ranked ballots for their mayoral and city council elections. The move came as multiple cities in the province were planning to switch from first-past-the-post to ranked ballots for the 2022 local elections. In 2022, the government passed the Strong Mayors, Building Homes Act, which granted extra powers to the mayor of Toronto and the mayors of other designated municipalities within their mayor–council governments. The Ford government's Better Regional Governance Act, 2026 gives the province power to appoint chairs/wardens in many regional governments, including in Peel Region, the Regional Municipality of Durham, the Waterloo Regional Municipality, and the Regional Municipality of York.
Sources: en.wikipedia.org
== Scholarly works == Clinical, laboratory and imaging features of COVID-19: A systematic review and meta-analysis, Published in Travel Medicine and Infectious Disease, Volume 34, March–April 2020 Central nervous system involvement by severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), Published in The Journal of Medical Virology, Volume 92 Issue 7, July 2020 Probable Zoonotic Leprosy in the Southern United States, Published in the New England Journal of Medicine, April 28, 2011. ChikDenMaZika Syndrome: the challenge of diagnosing arboviral infections in the midst of concurrent epidemics, Published in Annals of Clinical Microbiology and Antimicrobials, Article 42, July 22, 2016. Lobomycosis in Venezuela, Published in the International Journal of Dermatology, Volume 46, Issue 22, February 2007. Venezuela's humanitarian crisis, resurgence of vector-borne diseases, and implications for spillover in the region, Published in The Lancet, Volume 19, Issue 5, May 2019.
Very high doses of acetaminophen are capable of producing acute liver failure and death within hours, and patients who survive this acute phase of the toxicity generally require dialysis and eventually a liver transplant. Due to the many methods of preparation a user can not know how much acetaminophen is in any given batch and therefore can not reliably determine a safe dose. A dose of the last batch which produced no toxic effects may produce lethal effects in the next batch.
However, a subsequent study failed to replicate these findings under similar conditions. In addition, as previously described, RO5203648 did not affect methamphetamine-induced dopamine release and reuptake inhibition in synaptosomes in vitro. The dopamine elevations and psychostimulant-like effects of amphetamines are not only preserved but are actually augmented in TAAR1 knockout mice in vivo. Concordant in-vivo findings have been made with amphetamines combined with TAAR1 agonists and antagonists as well as with TAAR1 overexpression. It appears that TAAR1 agonism by amphetamines, such as amphetamine, methamphetamine, and MDMA, auto-inhibits their monoaminergic effects. Conversely, most cathinones lack TAAR1 agonism, and this might enhance their effects compared to amphetamines. RO5203648 does not significantly affect basal locomotion. Conversely, the drug has been found to dose-dependently suppress cocaine-induced hyperlocomotion in mice and rats, whereas it only suppressed dextroamphetamine-induced hyperactivity at a high dose in rats and did not affect dextroamphetamine-induced hyperlocomotion in mice. RO5203648 reduced early but potentiated late hyperlocomotion induced by methamphetamine. With chronic administration of RO5203648 and methamphetamine, RO5203648 dose-dependently and progressively decreased methamphetamine-induced hyperlocomotion. TAAR1 full agonists like RO5166017 and RO5256390 also suppress psychostimulant-induced hyperlocomotion.
=== Surgery === Bariatric surgery has also been proposed as another approach to treat BED, and a recent meta-analysis showed that approximately two-thirds of individuals who seek this type of surgery for weight loss purposes have BED. Bariatric surgery recipients who had BED before receiving the surgery tend to have poorer weight-loss outcomes and are more likely to continue to exhibit eating behaviors characteristic of BED.
Sources: en.wikipedia.org
A sealed container at room temperature, away from moisture and direct heat, is suitable for most solid material. Keeping the lid closed limits water uptake and caking. Long-term storage in a refrigerator is not necessary if the powder remains dry.
Heat, moisture, and prolonged time in solution promote conversion to creatinine. The reaction is faster at higher temperatures and at pH values far from neutral. Dry powder is much more stable than dissolved material.
Common methods include high-performance liquid chromatography for creatine and creatinine, plus water-content analysis by Karl Fischer titration. Heavy metals, residual solvents, and microbial limits may also be tested. A specification may list total creatine content and impurity limits.
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.