Everything below concerns Guanidinium group. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-08-13. Where a claim depends on a specific study, the study is described rather than over-claimed.
Creatine is synthesized endogenously in humans, mainly in the liver, kidney, and pancreas, from the amino acids arginine, glycine, and methionine. Skeletal muscle stores much of the body's creatine, where it participates in the phosphocreatine system that buffers adenosine triphosphate during short, intense contractions. Dietary sources include meat and fish, so omnivorous diets provide additional creatine beyond endogenous production. Supplemental creatine monohydrate supplies the same molecule found in food and tissues, not a distinct drug or hormone. Research interest centers on its role in cellular energy transfer and its effects on muscle and other tissues.
Several creatine forms are sold, including monohydrate, anhydrous, hydrochloride, nitrate, citrate, and blends. Once dissolved, these forms deliver creatine, but they differ in molar mass, solubility, counterions, and water content. Creatine monohydrate has the largest body of published human data among these forms. Questions remain about whether any alternative form offers meaningful advantages in absorption, tolerability, or tissue uptake under practical conditions. The hydrate form's lower creatine content by mass is a compositional fact, not a statement about effectiveness.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C4H11N3O3 | Often written C4H9N3O2·H2O |
| Molar mass | 149.15 g/mol | Anhydrous creatine is 131.13 g/mol |
| Appearance | White crystalline powder | Odorless, fine or granular |
| Water solubility | About 13 g/L at 25 °C | Low; increases with temperature |
| Common synonyms | Creatine hydrate; N-carbamimidoylsarcosine monohydrate | CAS 6020-87-7 |
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.
Solid creatine monohydrate is generally stable when kept dry and protected from extremes of heat and humidity. In the presence of moisture, it can gradually convert to creatinine, a cyclic dehydration product that has little value for phosphocreatine synthesis. Elevated temperatures and acidic conditions accelerate this conversion in solution. Because the reaction is slow in cool, dry storage, typical shelf lives are measured in years rather than weeks. Packaging that limits moisture and oxygen exposure helps maintain purity.
Recommended storage usually involves a sealed container kept at room temperature, away from direct sunlight and moisture. High humidity can cause caking, which changes flow properties and may complicate accurate weighing. Repeated opening of containers exposes the powder to air and moisture, so smaller aliquots can reduce handling effects. Storage temperature ranges are not absolute requirements; they reflect conditions that slow degradation and preserve consistent physical characteristics. Clean, dry tools help prevent contamination during sampling.
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.
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.
Similarly, in mice, a postprandial increase in hepatic leptin expression has also been reported. However, in grass carp, intraperitoneal injection of recombinant leptin only alters the appetite on the first day, and does not influence food intake during the ensuing 12 days. At present, the data for Atlantic salmon are therefore quite different and suggest that leptin expression in this species may have a complex lipostatic function.
The 21st century saw the company return to independence when it was purchased from Diageo by a group of investment firms led by TPG Capital for US$1.5 billion in 2002. The new owners rapidly moved to revitalize and reorganize the company, culminating with the company being taken public in 2006 with a highly successful initial public offering. The firms' strategy for turning the chain around included a new advertising agency and new ad campaigns, a revamped menu strategy, a series of programs designed to revamp individual stores, a new restaurant concept called the BK Whopper Bar, and a new design format called 20/20. These changes successfully re-energized the company, leading to a score of profitable quarters. New owners failed to stop the Great Recession from weakening the company's outlook, even as competitor McDonald's grew. The falling value of Burger King eventually led to TPG and its partners divesting their interest in the chain in a US$3.26 billion sale to 3G Capital of Brazil. Analysts from financial firms UBS and Stifel Nicolaus agreed that 3G would have to invest heavily in the company to help reverse its fortunes. After the deal was completed, the company's stock was removed from the New York Stock Exchange, ending four years as a public company. The delisting of its stock was designed to help the company repair its fundamental business structures and continue working to close the gap with McDonald's without having to worry about pleasing shareholders.
== Treatment == Surgery, with as wide a margin of removal as possible, has generally been the most effective and preferred way to attack LMS. If surgical margins are narrow or not clear of tumor, however, or in some situations where tumor cells were left behind, chemotherapy or radiation has been shown to give a clear survival benefit. While LMS tends to be resistant to radiation and chemotherapy, each case is different and results can vary widely. For metastatic (widespread) disease, chemotherapy and targeted therapies are the first choices. Chemotherapy regimens include doxorubicin/ifosfamide and doxorubicin combination/gemcitabine and docetaxel/trabectedin; pazopanib is the targeted therapy used in metastatic leiomyosarcoma as second line and is well tolerated. LMS of uterine origin often responds to hormonal treatments. As of 2020, several clinical trials for uterine LMS are active.
In the cocurrent flow exchange mechanism, the two fluids flow in the same direction. As the cocurrent and countercurrent exchange mechanisms diagram showed, a cocurrent exchange system has a variable gradient over the length of the exchanger. With equal flows in the two tubes, this method of exchange is only capable of moving half of the property from one flow to the other, no matter how long the exchanger is. If each stream changes its property to be 50% closer to that of the opposite stream's inlet condition, exchange will stop when the point of equilibrium is reached, and the gradient has declined to zero. In the case of unequal flows, the equilibrium condition will occur somewhat closer to the conditions of the stream with the higher flow.
Blumofe (1930), producer of Bound for Glory, nominated for the Academy Award for Best Picture Ben Maddow (1930), screenwriter for The Asphalt Jungle, God's Little Acre and The Mephisto Waltz Albert Maltz (1930), screenwriter for Destination Tokyo and one of the Hollywood Ten Arnold M. Auerbach (1932), Primetime Emmy Award-winning American comedy writer William Ludwig (1932), Academy Award-winning screenwriter, Interrupted Melody Martin Manulis (1935), CBS television and movie producer, Days of Wine and Roses, The Best of Broadway, Climax!, Suspense; creator of Playhouse 90; former president of 20th Century Fox Television Charles H. Schneer (1940), film producer known for his collaboration with Ray Harryhausen I.A.L. Diamond (1941), screenwriting partner of Billy Wilder; co-author of Some Like It Hot; co-winner of the Academy Award for Best Original Screenplay for The Apartment Don M.
Sources: en.wikipedia.org
The College of American Pathologists (CAP) is a member-based physician organization founded in 1946, comprising approximately 18,000 board-certified pathologists. It serves patients, pathologists, and the public by fostering and advocating best practices in pathology and laboratory medicine. It is the world's largest association composed exclusively of pathologists certified by the American Board of Pathology, and is widely considered the leader in laboratory quality assurance. The CAP is an advocate for high-quality and cost-effective medical care. The CAP currently inspects and accredits medical laboratories under authority from the Centers for Medicare & Medicaid Services. Their standards have been called "the toughest and most exacting in the medical business." The CAP provides resources and guidance to laboratories seeking accreditation in programs for biorepositories, genomics, ISO 15189, and more. In November 2008, Piedmont Medical Laboratory of Winchester, Virginia became the first laboratory in the United States to be officially accredited under ISO 15189. The CAP provides accreditation and proficiency testing to medical laboratories through its laboratory quality solutions programs. Early versions of proficiency testing—known as surveys—which laboratories use to help test and ensure accuracy, were first initiated in 1949. Laboratories first began receiving CAP accreditation in 1964, and the organization was later given authority to accredit medical laboratories as a result of the Clinical Laboratory Improvement Amendments of 1988.
Salvia divinorum is becoming more widely known and used in modern culture. The National Survey on Drug Use and Health, an annual US based survey sponsored by the Substance Abuse and Mental Health Services Administration (SAMHSA), for 2006 estimated that about 1.8 million persons aged 12 or older had used Salvia divinorum in their lifetime, of which approximately 750,000 had done so in that year. The following year, 2007, saw the annual figure rise from 750,000 to 1 million US users.
There are a variety of bioreactors designed for 3D cell cultures. There are small plastic cylindrical chambers, as well as glass chambers, with regulated internal humidity and moisture specifically engineered for the purpose of growing cells in three dimensions. The bioreactor uses bioactive synthetic materials such as polyethylene terephthalate membranes to surround the spheroid cells in an environment that maintains high levels of nutrients. They are easy to open and close, so that cell spheroids can be removed for testing, yet the chamber is able to maintain 100% humidity throughout. This humidity is important to achieve maximum cell growth and function. The bioreactor chamber is part of a larger device that rotates to ensure equal cell growth in each direction across three dimensions. QuinXell Technologies now under Quintech Life Sciences from Singapore has developed a bioreactor known as the TisXell Biaxial Bioreactor which is specially designed for the purpose of tissue engineering. It is the first bioreactor in the world to have a spherical glass chamber with biaxial rotation; specifically to mimic the rotation of the fetus in the womb; which provides a conducive environment for the growth of tissues. Multiple forms of mechanical stimulation have also been combined into a single bioreactor. Using gene expression analysis, one academic study found that applying a combination of cyclic strain and ultrasound stimulation to pre-osteoblast cells in a bioreactor accelerated matrix maturation and differentiation.
=== Spray drying === King later turned to spray drying of beverages and other liquids, for which the loss of volatile flavor and aroma substances occurs largely in the spray-nozzle zone, where the droplets to be dried are formed. King and his colleagues examined factors influencing the loss of volatile flavors and aroma and also the factors affecting the development of particle morphology (size, shape, porosity, and thus the bulk density) of the dried product. They interpreted the factors that cause spray-dried particles to be sticky. In later research, King and his colleagues created a device to enable simultaneous measurement of particle morphology and loss of volatile components as the drying of single drops to particles took place. This research was supported by the National Science Foundation. He prepared review articles on retention of volatile flavor and aroma components during spray drying. In later research, King and his colleagues created a device to enable simultaneous measurement of particle morphology and loss of volatile components as the drying of single drops to particles took place.
Sources: en.wikipedia.org
Later, once news of Tender's fraud breaks, Yasmin enlists Norton and one of his right-wing tabloids to circulate a lie that the Labour government suppressed internal concerns about Tender. Norton is aware Henry will bear the brunt of the fallout and will be unable to survive it, but reluctantly agrees to Yasmin's plan, reasoning that Henry is beyond saving. Months later, after Tender's downfall and Henry's arrest and divorce from Yasmin, Norton and Yasmin continue working together, taking on Reform MP Sebastian Stefanowicz as a PR client to cultivate his profile ahead of a possible PM bid. Norton and Henry reconcile after Henry accepts a plea deal, and he, Henry, and Otto are last seen fishing together.
S. affinis is planted as a bulb (vegetative) in spring (March–May). Multiple bulbs are planted 5 to 8 cm (2 to 3+1⁄8 in) deep into a hole of dimensions 30 by 30 cm (12 by 12 in). The plant can achieve a height of 30 cm (12 in). Weeding is necessary but it is important not to damage the root system. A sufficient water supply during summer is important. Harvest is from November to March. It is important that the soil is not frozen when harvesting. The storage of S. affinis tubers is difficult. Because of their thin skin, they can be stored only for a few days, about a week in a fridge. An alternative can be a fresh ongoing harvesting out of humid sand, thereby the tubers stay fresh for several months.
Low levels of glycogen branching enzyme leads to a condition known as glycogen-branching enzyme deficiency. This condition is caused by a mutation of the GBE1 gene responsible for producing the glycogen branching enzyme. Subsequently, glycogen molecules are produced with few branches, which greatly decreases the number of nonreducing ends, drastically slowing the rate at which the molecule can be synthesized or broken down. This causes low levels of muscle glycogen that is very resistant to amylase. This disease is usually seen in Quarter Horse foals and is fatal.
Sources: en.wikipedia.org
It is the hydrated crystalline form of creatine, containing one bound water molecule per creatine unit. The compound is commonly used as a nutritional ingredient and as a research material.
Yes, endogenous synthesis occurs mainly in the liver, kidney, and pancreas. Meat and fish also contribute creatine to the diet.
Other forms contain creatine paired with different counterions or lacking water, so their mass and solubility differ. After dissolution, creatine itself is the shared active molecule.
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.