This is a working overview of monohydrate, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-09-22. Anything still debated is marked as such rather than presented as settled.
Storage recommendations generally emphasize a cool, dry place away from direct sunlight and strong oxidizers. Sealed containers limit humidity exchange, which helps prevent clumping and gradual conversion to creatinine. Long-term stability studies usually monitor appearance, moisture, and purity at intervals under defined temperature and humidity conditions. Accelerated tests at elevated temperature can reveal degradation pathways, but they do not perfectly predict room-temperature shelf life. Questions remain about how much creatinine formation is acceptable in different product categories and how packaging choices affect that rate over time.
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.
Laboratory analysis of creatine monohydrate typically uses high-performance liquid chromatography to separate creatine from creatinine and other impurities. Detection may be ultraviolet, refractive index, or mass spectrometric, depending on the laboratory's equipment and the required sensitivity. Nuclear magnetic resonance spectroscopy can quantify the main component and identify related substances. Water content is measured by Karl Fischer titration, which is important because the monohydrate has a defined theoretical hydration level. Heavy metals, residual solvents, and microbial limits are also checked in quality control programs.
Commercial creatine monohydrate is produced mainly by chemical synthesis rather than extraction from animal tissue. Suppliers provide a certificate of analysis listing assay, water content, and impurity limits, and some products undergo third-party testing. Verification of identity can use infrared or Raman spectroscopy alongside chromatographic methods. Storage recommendations generally call for a cool, dry place and a tightly closed container to limit moisture uptake. Open questions include how packaging, flavoring agents, and long-term storage affect the stability of finished products.
| 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 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 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.
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.
Quality control for creatine monohydrate begins with identity confirmation and assay determination. Laboratories commonly use high-performance liquid chromatography with ultraviolet detection, often after derivatization or using a suitable column, to quantify creatine. Karl Fischer titration measures water content, which helps verify the monohydrate stoichiometry. Additional tests screen for heavy metals, residual solvents, and microbial contamination depending on the intended use. These tests establish composition and purity rather than biological effect.
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.
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.
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.
==== Promethazine ==== Promethazine is one of the recommended drugs by NASA to treat space motion sickness and studies have been conducted to analyze their pharmacological responses in outer space. Studies on promethazine were performed exclusively on Earth, called earthbound models, stimulating microgravity and weightlessness through forty-eight hours of bed rest. The −6° head-down best rest model, where individuals are placed lying 6 degrees down to study weightlessness. This type of model simulates the shift in fluid from the bottom to the top of the body, as well as bone loss, found in astronauts in weightless environments. Using twelve volunteers, 50 mg of promethazine was delivered orally or intramuscularly to the deltoid muscle before and after forty-eight hours of bedrest. Blood was examined at intervals of 0.5, 1, 1.5, 2, 3, 4, 6, 8, 10, 12, 16, 24, 36, and 48 hours post-drug deliverance and promethazine levels were detected using plasma promethazine assays, which uses liquid chromatography to quantify promethazine kinetics. The study determined that higher concentrations of promethazine were found in the blood through oral delivery and bioavailability factors was impacted through weightlessness.
=== Others === SMA is a copolymer with maleic anhydride. Styrene can be copolymerized with other monomers; for example, divinylbenzene can be used for cross-linking the polystyrene chains to give the polymer used in solid phase peptide synthesis. Styrene-acrylonitrile resin (SAN) has a greater thermal resistance than pure styrene.
=== Angiogenesis === MMP9 may play an important role in angiogenesis and neovascularization. For example, MMP9 appears to be involved in the remodeling associated with malignant glioma neovascularization. It is also a key regulator of growth plate formation- both growth plate angiogenesis and the generation of hypertrophic chondrocytes. Knock-out models of MMP9 result in delayed apoptosis, vascularization, and ossification of hypertrophic chondrocytes. Lastly, there is significant evidence that Gelatinase B is required for the recruitment of endothelial stem cells, a critical component of angiogenesis
There has been uncertainty about which biological target interactions mediate the psychoactive and other effects of ibogaine. Rodent drug discrimination studies with ibogaine have been employed to help elucidate these interactions. Ibogaine partially substitutes for the serotonergic psychedelics LSD and DOM and this can be blocked by the serotonin 5-HT2 receptor antagonist pizotifen. Similarly, LSD and DOM partially substitute for ibogaine and this can be blocked by the serotonin 5-HT2A receptor antagonist pirenperone. The serotonin releasing agent and potent serotonin 5-HT2 receptor agonist fenfluramine also partially substitutes for ibogaine. The preferential serotonin 5-HT2C receptor agonists MK-212 and mCPP partially substitute for ibogaine as well and this can be blocked by the serotonin 5-HT2 receptor antagonist metergoline. The preceding findings suggest that serotonin 5-HT2A and 5-HT2C receptor activation are involved in the subjective effects of ibogaine. Conversely, the serotonin 5-HT1A and 5-HT3 receptors do not appear to be involved. Although serotonin 5-HT2A receptor signaling appears to be involved in the effects of ibogaine, neither ibogaine nor its major active metabolite noribogaine appears to act as a direct serotonin 5-HT2A receptor agonist. In addition, in contrast to the findings in drug discrimination studies, ibogaine fails to produce the head-twitch response, a behavioral proxy of psychedelic effects, in rodents.
Sources: en.wikipedia.org
TikTok was downloaded over 104 million times on Apple's App Store during the first half of 2018, according to data provided to CNBC by Sensor Tower. After merging with musical.ly in August, downloads increased and TikTok subsequently became the most downloaded app in the US in October 2018, which musical.ly had done once before. In February 2019, TikTok, together with Douyin, hit one billion downloads globally, excluding Android installs in China. In 2019, media outlets cited TikTok as the 7th-most-downloaded mobile app of the decade, from 2010 to 2019. It was also the most-downloaded app on Apple's App Store in 2018 and 2019, surpassing Facebook, YouTube and Instagram. In September 2020, a deal was confirmed between ByteDance and Oracle in which the latter will serve as a partner to provide cloud hosting. In November 2020, TikTok signed a licensing deal with Sony Music. In December 2020, Warner Music Group signed a licensing deal with TikTok. The advertising revenue of short video clips is lower than other social media: while users spend more time, American audience is monetized at a rate of $0.31 per hour, a third the rate of Facebook and a fifth the rate of Instagram, $67 per year while Instagram will make more than $200. In July 2023, Iranian Mehr News Agency reported "experts from Douyin" will meet Iranian business in Tehran to enable Iranian exports to China. In 2023, several high-level executives transferred from ByteDance to TikTok to focus on moneymaking operations. Some moved from Beijing to the US.
== Biology == Selenenic acids derived from selenocysteine are involved in cell signaling and certain enzymatic processes. The best known selenoenzyme, glutathione peroxidase (GPx), catalyzes the reduction of peroxides by glutathione (GSH). The selenenic acid intermediate (E-SeOH) is formed upon oxidation of the catalytically active selenol (E-SeH) by hydrogen peroxide. This selenenic acid derivative of the peroxidase then reacts with a thiol-containing cofactor (GSH) to generate the key intermediate selenenyl sulfide (E-SeSG). This intermediate is subsequently attacked by a second GSH to regenerate the selenol and the glutathione cofactor is released in its oxidized form, GSSG. The catalytic mechanism of GPx, involves selenol (R-SeH), selenenyl sulfide (R1-SeS-R2), and selenenic acid intermediates.
=== Vietnam war activism === During the 1960s, President Lyndon B. Johnson's policy of increasing America's involvement in the Vietnam War caused an anti-war movement that the Paulings joined with enthusiasm. Pauling denounced the war as unnecessary and unconstitutional. He made speeches, signed protest letters and communicated personally with the North Vietnamese leader, Ho Chi Minh, and gave the lengthy written response to President Johnson. His efforts were ignored by the American government.
Sources: en.wikipedia.org
Johnny Kastl is an American lawyer and former actor, perhaps best known for his recurring role as Dr. Doug Murphy on the medical comedy Scrubs (2001–2009). He made cameo appearances in several Hollywood productions and played other parts on television, including the role of Todd Jaracki on The Beast (2009).
=== Pharmacodynamics === Zalsupindole is a non-selective serotonin receptor modulator including of the serotonin 5-HT2A receptor. It acts as a low-potency, low-efficacy partial agonist of the serotonin 5-HT2A receptor, with an EC50Tooltip half-maximal effective concentration of 8,200 nM and an EmaxTooltip maximal efficacy of 17%. The drug is also a moderate-efficacy partial agonist of the serotonin 5-HT2C receptor, with an EC50 of 3,300 nM and an Emax of 70%. Other activities have also been reported. It is selective for the serotonin 5-HT2 receptors over a number of other receptors, including the serotonin 5-HT1A receptor, dopamine receptors, adrenergic receptors, and the κ-opioid receptor, among others. The drug is a silent antagonist of the serotonin 5-HT2B receptor, with an IC50Tooltip half-maximal inhibitory concentration of 27,600 nM. Zalsupindole is orally bioavailable and centrally penetrant in animals. It is a psychoplastogen via activation of the serotonin 5-HT2A receptor and rapidly and persistently increases neuroplasticity in preclinical research. The serotonin 5-HT2A receptor antagonist ketanserin abolishes the psychoplastogenic effects of zalsupindole. Zalsupindole produces comparable psychoplastogenic effects to serotonergic psychedelics like psilocin and dimethyltryptamine (DMT) as well as to the dissociative ketamine. Animal studies have found that the drug produces antidepressant-like effects without causing psychedelic-like effects such as the head-twitch response. It does not produce hyperlocomotion at therapeutically relevant doses.
=== Psychological motivations === Psychology is another factor to take into consideration in doping in sport. It becomes a behavioral issue when the athlete acknowledges the health risks associated with doping, yet participates in it anyway. This has to do with the psychological thinking that the drug will make one feel invincible. The individuals are very egotistic in their way of thinking and their motivation is dependent on the performance enhancement drug since they believe that it delivers the results. On a study on health psychology, Quirk points out three different psychological aspects that lead one to dope: social cognition, stress and strain, and addiction. The social and physical pressures can alter an athlete's way of thinking, leading them to believe that they must take performance enhancement drugs since everyone else is doing it, known as "the doping dilemma." This also causes athletes to be hesitant to consult with a doctor about their steroid use, putting themselves at more risk with health problems.
=== Healthcare === The Ajinomoto Group's healthcare business is based on using the fermentation technology of amino acids. In 1956, Ajinomoto began producing the world's first amino acid infusion, enteral nutrition products, and crystalline amino acids that could be used as raw materials in pharmaceutical products. Currently, Ajinomoto manufactures around twenty kinds of amino acids at various factories overseas, including plants in Japan, the United States, Europe, and India. In 1995, Ajinomoto began selling an amino acid supplement called Amino Vital for professional sports athletes. In 2011, Ajinomoto began offering an "Amino Index" health checkup, which statistically analyzes the difference in amino acid concentrations between healthy individuals and adults suffering from cancer and other serious diseases to aid the early detection of cancer and other diseases. In addition to glutamates as a seasoning, the company also produces other amino acids such as L-Leucine, L-Tyrosine, Glycine, and L-Phenylalanine, which it markets as dietary supplements under the brand name AjiPure.
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.
Purity testing often uses high-performance liquid chromatography to measure creatine and creatinine. Water content can be checked by Karl Fischer titration. Additional tests may cover heavy metals, residual solvents, and microbial contamination.