If you have been reading about monohydrate and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-08-01. 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.
The compound was identified in the nineteenth century after chemists isolated a nitrogenous substance from meat extracts. Later work established its role in muscle energy metabolism and its conversion to phosphocreatine. Chemical synthesis of creatine followed, and industrial production made the monohydrate widely available as a purified powder. Interest expanded in the late twentieth century when researchers began studying creatine supplementation and muscle physiology. Historical accounts sometimes differ on exact dates and attributions, but the broad sequence from tissue extracts to synthetic production is well documented.
In the body, creatine is obtained from dietary meat and fish and is also synthesized from arginine, glycine, and methionine. Muscle stores creatine and phosphocreatine, which participate in the rapid regeneration of adenosine triphosphate during short, intense activity. The monohydrate form is used in research because it is chemically defined, stable as a dry solid, and relatively inexpensive to produce. Questions remain about whether other creatine forms offer meaningful advantages in absorption or tissue retention, and findings vary across studies and populations.
| 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. |
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 chemical terms, creatine monohydrate is often described as N-(aminoiminomethyl)-N-methylglycine monohydrate, though nomenclature varies. Its solid state consists of zwitterionic creatine molecules linked with water through hydrogen bonding. The compound dissolves in water, but dissolution rate depends on particle size, temperature, and agitation. Once dissolved, the hydrate water becomes part of the solvent, leaving free creatine in solution. The monohydrate is not the same as creatine anhydrous, which lacks the water of crystallization and has a higher creatine fraction by mass.
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.
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.
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.
=== Florists' attitudes === Many traditional retail florists have a deep-rooted disdain for modern wire services. This comes from the perception that companies such as FTD, 1800flowers, From You Flowers and Teleflora take floral orders away from the local business and extract excessive commission. FTD was formerly a co-op, owned by its member florists. In 1994 the board of directors made the decision to sell the co-op to Perry Capital. The revenue from the sale was disbursed amongst the member florists, more senior florists being paid substantially more than the more junior florists. At this point FTD became a for-profit company.
== Mechanical properties == As noted above, the (two-dimensional) density of graphene is 0.762 mg per square meter. Graphene is the strongest material ever tested, with an intrinsic tensile strength of 130 GPa (19,000,000 psi) (with representative engineering tensile strength ~50-60 GPa for stretching large-area freestanding graphene) and a Young's modulus (stiffness) close to 1 TPa (150,000,000 psi). The Nobel announcement illustrated this by saying that a 1 square meter graphene hammock would support a 4 kg cat but would weigh only as much as one of the cat's whiskers, at 0.77 mg (about 0.001% of the weight of 1 m2 of paper). Large-angle bending of graphene monolayers with minimal strain demonstrates its mechanical robustness. Even under extreme deformation, monolayer graphene maintains excellent carrier mobility. The spring constant of suspended graphene sheets has been measured using an atomic force microscope (AFM). Graphene sheets were suspended over SiO2 cavities where an AFM tip was used to apply stress to the sheet to test its mechanical properties. Its spring constant was in the range 1–5 N/m and the stiffness was 0.5 TPa, which differs from that of bulk graphite. These intrinsic properties could lead to applications such as NEMS as pressure sensors and resonators. Due to its large surface energy and out of plane ductility, flat graphene sheets are unstable with respect to scrolling, i.e. bending into a cylindrical shape, which is its lower-energy state.
Tacrolimus, sold under the brand name Prograf among others, is an immunosuppressive drug. After an allogenic organ transplant, the risk of organ rejection is moderate; tacrolimus is used to lower the risk of organ rejection. Tacrolimus is also sold as a topical medication for treating T cell-mediated diseases, such as eczema and psoriasis. For example, it is prescribed for severe refractory uveitis after a bone marrow transplant, exacerbations of minimal change disease, Kimura's disease, and vitiligo. It can be used to treat dry eye syndrome in cats and dogs. Tacrolimus inhibits calcineurin, which is involved in the production of interleukin-2, a molecule that promotes the development and proliferation of T cells, as part of the body's learned (or adaptive) immune response. Chemically, it is a macrolide lactone that was first discovered in 1987, from the fermentation broth of a Japanese soil sample that contained the bacterium Streptomyces tsukubensis. It is on the World Health Organization's List of Essential Medicines. In 2021, it was the 296th most commonly prescribed medication in the United States, with more than 500,000 prescriptions.
=== 1981 === January 17: Martial law was lifted by Ferdinand Marcos in preparation for the visit of Pope John Paul II. January 20: Ronald Reagan inaugurated 40th President of the United States. Reagan is elected on a platform opposed to the concessions of détente. Also that day the Iran hostage crisis ends. March 30: Two months after his inauguration Ronald Reagan is shot in the chest while leaving a Washington hotel. The gunman, John Hinckley, is found to be mentally unhinged and obsessed with actress Jodie Foster. April 1: The United States suspends economic aid to Nicaragua. April 6: The Somaliland War of Independence was waged by the Somali National Movement in northern Somalia. May 13: While riding in an open-topped car through the Vatican, Pope John Paul II is shot four times in the abdomen and right arm. The gunman, Mehmet Ali Agca, is a Turkish Kurd with uncertain motives. August 19: Gulf of Sidra Incident: Libyan planes attack U.S. jets in the Gulf of Sidra, which Libya has illegally annexed. Two Libyan jets are shot down; no American losses are suffered. September 21: Belize becomes independent from the UK. 1,500 British soldiers remain to deter Guatemala from attacking the country over territorial disputes. October 6: President Anwar Sadat of Egypt is shot and killed in Cairo during the annual victory parade. October 27: A Soviet submarine, the U137, runs aground not far from the Swedish naval base at Karlskrona. November 23: The U.S. Central Intelligence Agency (CIA) begins to support anti-Sandinista Contras. December 13: Gen.
Sources: en.wikipedia.org
=== Painting === Banting developed an interest in painting beginning around 1921 while he was in London, Ontario. Some of his first pieces were done on the back of the cardboard in which his shirts were packed by the dry-cleaners. He became friends with the Group of Seven artists A. Y. Jackson and Lawren Harris, fellow members of the Arts and Letters Club of Toronto, sharing their love of the rugged Canadian landscape. Writing on Banting, Jackson recalls that "He did not want to make a business of art and would tell [would-be purchasers] to go buy a Lismer or something else and then he would exchange it for one of his." An obituary said, "A member of the Arts and Letters Club of Toronto, he was one of Canada's most accomplished amateur painters." In 1927, he made a sketching trip with Jackson to the St. Lawrence River in Quebec. Later that year, they travelled to RCMP outposts in the Arctic on the Canadian government supply ship Beothic. The sketches, done both in oils on birch panels and in pen and ink, were named after the places he visited: Craig Harbour, Ellesmere Island; Pond Inlet, Baylot Island; Eskimo tents at Etach; others were untitled. A collection of Banting's paintings was acquired by and donated to the Owens Art Gallery at Mount Allison University in 1928. Jackson and Banting also made painting expeditions to Great Slave Lake, Walsh Lake (Northwest Territories), Georgian Bay, French River and the Sudbury District. At the time of his death in 1941, Banting was one of Canada's best-known amateur painters.
At certain times in the geological past, reef-building organisms similar to corals were very abundant. Like modern corals, these ancient organisms built reefs, some of which ended as great structures in sedimentary rocks. Fossils of fellow reef-dwellers algae, sponges, and the remains of many echinoids, brachiopods, bivalves, gastropods, and trilobites appear along with coral fossils. This makes some corals useful index fossils. Coral fossils are not restricted to reef remnants, and many solitary fossils are found elsewhere, such as Cyclocyathus, which occurs in England's Gault clay formation.
The Serbsky Center, Moscow Institute of Psychiatry, and Russian Center of Vegetative Pathology are reported to have confirmed the effectiveness of phenylpiracetam describing the following effects: improvement of regional blood flow in ischemic regions of the brain, reduction of depressive and anxiety disorders, increase the resistance of brain tissue to hypoxia and toxic effects, improving concentration and mental activity, a psycho-activating effect, increase in the threshold of pain sensitivity, improvement in the quality of sleep, and an anticonvulsant action, though with the side effect of an anorexic effect in extended use.
Sources: en.wikipedia.org
== Function == Through the diverse outputs of the orexin system, the orexin neurons in the lateral hypothalamus mediate an array of functions. Two of the most commonly noted functions of orexin peptides in the lateral hypothalamus are the promotion of feeding behavior and arousal (i.e., wakefulness). More generally, the orexinergic neural projections of the lateral hypothalamus are involved in thermoregulation, regulating gastrointestinal motility and gastrointestinal function by way of the dorsal nucleus of the vagus nerve, reducing pain and nociception through several output structures (e.g., periaqueductal gray matter), modulating the rewarding property of stimuli through the ventral tegmental area projections and other outputs in the reward system, regulating energy homeostasis and neuroendocrine functions (e.g., HPA axis, HPG axis, and HPT axis) through other hypothalamic outputs, and regulating visceral functions (e.g., respiration, blood pressure, and urination) via a group of structures in the brain stem, among other functions. The endocannabinoid system and the orexin system mediate many of the same cognitive and physical effects, and a significant overlap in their function and localization has been noted in a 2013 medical review; the CB1–OX1 receptor heterodimer produces a 100-fold amplification of the potency of the orexin receptor 1-mediated ERK pathway signaling. Unique functional interactions have been noted as well, such as an OX1-induced CB1 pressor response in the rostral ventrolateral medulla.
=== Radiation therapy === Radiation therapy is the most frequently used treatment for hypersomatotropic cats. Radiation therapy is expensive, limited in availability, cost, frequent anaesthetic, and the unpredictable outcomes for hormonal control. The resolution or improvement of neurological signs is the most consistent effect. Improvement diabetes symptoms is less consistent. One study found an average of 5 weeks for improvement to glycaemic control with all cats seeing an improvement within 20 weeks. The same study found 6 of the 14 cats to achieve diabetic remission within 6 months with an average of 3.6 months. Diabetic remission may occur as late as a year after radiotherapy. Improvement of diabetic symptoms occurs in roughly 70-80% of cases, diabetic remission occurs in roughly 50%. The physical acromegalic changes often persistent or have only slight improvement. High IGF-1 levels have been reported in cats following radiation therapy. Of note is that in several of those cases the patient had good control of diabetic symptoms or was in remission. Radiation therapy is tolerated by the majority of cats. Side effects such as ischaemic brain necrosis and hearing loss are rare and proper fractionation protocol can prevent these effects from occurring; hypopituitarism has not been reported in cats, despite being a common adverse effect in humans. Survival times for cats after radiation therapy has been reported to be up to 5 years.
== Diagnosis == Diagnosis is fourfold: History and physical examination, elevation of creatine kinase, electromyograph (EMG) alteration, and a positive muscle biopsy. The hallmark clinical feature of polymyositis is proximal muscle weakness, with less important findings being muscle pain and dysphagia. Cardiac and pulmonary findings will be present in approximately 25% of cases of patients with polymyositis. Sporadic inclusion body myositis (sIBM) is often misdiagnosed as polymyositis or dermatomyositis but it can be differentiated as myositis that does not respond to treatment is likely IBM. sIBM comes on over months to years; polymyositis comes on over weeks to months. Polymyositis tends to respond well to treatment, at least initially; IBM does not.
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.
It is a crystalline form of creatine that contains one water molecule per creatine molecule. The compound occurs naturally in muscle tissue and is also produced synthetically for research and consumer products. The monohydrate label describes the solid's hydration state.