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 2025-12-31. Numbers and descriptions here follow the published literature rather than marketing material.
Creatine monohydrate is a hydrated form of creatine, a nitrogen-containing compound involved in cellular energy metabolism. Its molecular formula is C4H9N3O2·H2O, with a molar mass around 149.15 g/mol. The monohydrate is the most common solid form used in research and commercial settings because it crystallizes readily and remains stable under ordinary conditions. The term monohydrate indicates one water molecule per creatine molecule in the crystal lattice. It appears as a white crystalline powder with low odor.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C4H9N3O2·H2O | Creatine plus one water molecule in the crystal lattice. |
| Molar mass | 149.15 g/mol | Calculated for the monohydrate form. |
| Appearance | White crystalline powder | Typical solid form; particle size can vary by processing. |
| Solubility class | Sparingly soluble in water | Dissolution improves with time, stirring, and temperature. |
| Common synonyms | Creatine hydrate; N-carbamimidoyl-N-methylglycine monohydrate | Names vary by chemical registry and supplier. |
As a supplement, creatine monohydrate is studied for its effects on muscle performance and recovery. The compound is often described as an ergogenic aid, meaning it may support physical work capacity. Research typically compares it with placebo or other forms, such as citrate or nitrate, under controlled conditions. Questions remain about the optimal dose and long-term effects in different populations, and findings are not uniform across all studies. The monohydrate form remains the most extensively tested.
Creatine monohydrate is a crystalline compound formed from creatine and one molecule of water. Its systematic name is N-(aminoiminomethyl)-N-methylglycine monohydrate, and it appears as a white, odorless powder with limited solubility in water. The monohydrate is the most common solid form used in research and commercial products because it is stable under dry conditions. The anhydrous form lacks the water of crystallization and differs slightly in molar mass. Both forms participate in the same biochemical reactions once dissolved.
In the body, creatine is synthesized from the amino acids arginine, glycine, and methionine, primarily in the liver and kidneys. It is transported to muscle and other tissues, where it is phosphorylated to phosphocreatine by creatine kinase. This phosphagen system provides a rapid source of adenosine triphosphate during short, intense contractions. Dietary creatine comes mainly from meat and fish, and the body's total pool is influenced by both synthesis and intake.
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.
== Prevention == Opioid overdoses can often be prevented. Clear protocols for staff at emergency departments and urgent care centers can reduce opioid prescriptions for individuals presenting in these settings who engage in drug seeking behaviors or who have a history of a substance use disorder. Drug seeking behaviors include but are not limited to obsessiveness or impatience when it comes to attaining medications, seeking multiple pain adjunct medications, and inconsistent physiological presentation. A prescription monitoring program may help determine if an individual is receiving a high doses of opioids or combinations of medications such as benzodiazepines and opioids that put them at high risk. Limited amount of evidence suggests opioid therapy with extended-release or long-acting formulations may increase the risk of an unintentional overdose compared to shorter-acting agents. Routinely screening using tools such as the CAGE-AID and the Drug Abuse Screening Test (DAST-10) in adults and the CRAFFT in those aged 14–18 years is recommended. The revised risk index for overdose or severe opioid induced respiratory depression (RIOSORD) is a validated screening tool that may be used to estimate the risk of overdose in people using opioids, or the rapid opioid dependence screen may be used as a more rapid and succinct method to screen for opioid use disorder. Other "drug seeking" behaviors and physical indications of drug use should be used as clues to perform formal screenings.
=== Lymphatic malformation (LM) === Lymphatic malformation, lymphangioma or cystic hygroma, is an abnormal growth of lymphatic vessels that usually affects children around the head and neck area and more rarely involving the tongue causing macroglossia. LM is caused by a PIK3CA mutation during lymphangiogenesis early in gestational cell formation causing the malformation of lymphatic tissue. Treatment often consists of removal of the affected tissue via excision, laser ablation or sclerotherapy, but the rate of recurrence can be high and surgery can have complications. Sirolimus has shown evidence of being an effective treatment in alleviating symptoms and reducing the size of the malformation by way of altering the mTOR pathway in lymphangiogenesis. Although an off label use of the drug, Sirolimus has been shown to be an effective treatment for both microcystic and macrocystic LM. More research is however needed to develop and create targeted, effective treatment therapies for LM.
=== Phagocytosis === Another cellular behavior that is affected by rho proteins is phagocytosis. As with most other types of cell membrane modulation, phagocytosis requires the actin cytoskeleton in order to engulf other items. The actin filaments control the formation of the phagocytic cup, and active Rac1 and Cdc42 have been implicated in this signaling cascade.
The "fever" was noted to have started spreading since late April 2022, with Pyongyang being the centre of the spread. In line with the politburo decision, various enterprises continued to operate normally while organising emergency quarantine procedures. Various major projects, such as the 10,000 residential flats project, were to continue as before. Also, on 13 May, North Korean state media reported 6 deaths and 350,000 cases of fevers. On 14 May, an additional 174,440 cases of fever were reported, with 81,430 recoveries and 21 deaths. During the politburo conference, Kim Jong Un stated that the current situation was equal to the turmoil from the founding of the country, but the situation could be overcome with strong governance over the situation. According to the report, cases of the virus spreading between different regions had reduced. Emergency drug distribution was also ordered to commence in accordance with the anti-pandemic plan. On 17 May, it was reported that during the 24-hour period from 15 to 16 May, 269,510 cases of fever were recorded in the country, 170,460 people were cured, and 6 more died. The total officially reported number of cases reached 1,483,060. Out of these, 819,090 recovered from the illness, 663,910 were receiving treatment, and 56 died. While case numbers continued to rise in the provincial regions, case numbers began to fall in Pyongyang. According to KCTV, out of the 50 deaths reported up to 17 May, 25 were due to inappropriate usage of medicine. On 19 May, 262,270 cases of fever were reported, with one death.
Sources: en.wikipedia.org
== Regulation of expression and activity == The formation of guanidinoacetate is normally the rate-limiting step of creatine biosynthesis. Consequently, the AGAT reaction is the most likely control step in the pathway, a hypothesis that is supported by a great deal of experimental work. Most important in this respect is the feedback repression of AGAT by creatine, the end-product of the pathway. Cyclocreatine, N-acetimidoylsarcosine, and N-ethylguanidinoacetate display repressor activity like creatine as well. L-Arginine and guanidinoacetate have only "apparent" repressor activity. They exert no effect on AGAT expression by themselves but are readily converted to creatine, which then acts as the true repressor. It has been suggested that AGAT activity in tissues is regulated in a number of ways including induction by growth hormone and thyroxine, inhibition of the enzyme by ornithine, and repression of its synthesis by creatine. Sex hormones may regulate the activity of AGAT. Treatment of male rats with testosterone propionate increases AGAT activity. In contrast, estrogen treatment decreases AGAT activity and induces weight loss. It is currently unclear whether the changes in the level of AGAT transcript results from altered mRNA stability or enhanced transcriptional rate. If estrogen-mediated alteration results from transcriptional regulation, the site of estrogen action is yet to be determined. GATM expression within the mouse placenta has been shown to be imprinted meaning only the maternal copy of GATM is expressed .
Dehydrogenase and oxidase are easily distinguishable if one considers the electron acceptor. An oxidase will remove electrons from a substrate as well, but only uses oxygen as its electron acceptor. One such reaction is: AH2 + O2 ↔ A + H2O2. Sometimes an oxidase reaction will look like this: 4A + 4H+ + O2 ↔ 4A+ + 2H2O. In this case, the enzyme is taking electrons from the substrate, and using free protons to reduce the oxygen, leaving the substrate with a positive charge. The product is water, instead of hydrogen peroxide as seen above. An example of an oxidase that functions like this is complex IV in the Electron Transport Chain (ETC). Note that oxidases typically transfer the equivalent of dihydrogen (H2), and the acceptor is a dioxygen. Similarly, a peroxidase (another subclass of oxidoreductases) will use a peroxide (H2O2) as the electron acceptor, rather than an oxygen.
== Wallerian degeneration slow == Mice belonging to the strain C57BL/Wlds have delayed Wallerian degeneration, and, thus, allow for the study of the roles of various cell types and the underlying cellular and molecular processes. Current understanding of the process has been possible via experimentation on the Wlds strain of mice. The mutation occurred first in mice in Harlan-Olac, a laboratory producing animals the United Kingdom. The Wlds mutation is an autosomal-dominant mutation occurring in the mouse chromosome 4. The gene mutation is an 85-kb tandem triplication, occurring naturally. The mutated region contains two associated genes: nicotinamide mononucleotide adenylyltransferase 1 (NMNAT1) and ubiquitination factor e4b (UBE4B). A linker region encoding 18 amino acids is also part of the mutation. The protective effect of the WldS protein has been shown to be due to the NMNAT1 region's NAD+ synthesizing active site. Although the protein created localizes within the nucleus and is barely detectable in axons, studies suggest that its protective effect is due to its presence in axonal and terminal compartments. The protection provided by the WldS protein is intrinsic to the neurons and not surrounding support cells, and is only locally protective of the axon, indicating an intracellular pathway is responsible for mediating Wallerian degeneration.
Intussusceptive angiogenesis, also known as splitting angiogenesis, is the formation of a new blood vessel by splitting an existing blood vessel into two. Intussusception was first observed in neonatal rats. In this type of vessel formation, the capillary wall extends into the lumen to split a single vessel in two. There are four phases of intussusceptive angiogenesis. First, the two opposing capillary walls establish a zone of contact. Second, the endothelial cell junctions are reorganized and the vessel bilayer is perforated to allow growth factors and cells to penetrate into the lumen. Third, a core is formed between the 2 new vessels at the zone of contact that is filled with pericytes and myofibroblasts. These cells begin laying collagen fibers into the core to provide an extracellular matrix for growth of the vessel lumen. Finally, the core is fleshed out with no alterations to the basic structure. Intussusception is important because it is a reorganization of existing cells. It allows a vast increase in the number of capillaries without a corresponding increase in the number of endothelial cells. This is especially important in embryonic development as there are not enough resources to create a rich microvasculature with new cells every time a new vessel develops.
The mycofactocin biosynthesis pathway is one of the most abundant of any RiPP system in the collection of bacterial genomes sequenced to date. However, its species distribution is heavily skewed towards the Actinomycetota, including Mycobacterium tuberculosis, which is the causative agent of tuberculosis and therefore the number one killer among bacterial pathogens of humans. The system is virtually absent from the normal human microbiome, although common in soil bacteria.
Sources: en.wikipedia.org
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.
Meat and fish contain creatine, and the human body also synthesizes it from amino acids. The monohydrate form is not a natural food ingredient as such; it is a manufactured crystalline solid that provides creatine after ingestion. Food sources contribute to total body creatine stores alongside endogenous synthesis.
It means the crystal lattice includes one molecule of water for each molecule of creatine. This water is part of the solid's ordered structure, not bulk moisture. The hydrate form influences properties such as solubility, density, and shelf stability.
It is a solid form of creatine that contains one water molecule per creatine molecule in the crystal lattice. The hydrate water is part of the crystal structure rather than loose moisture. The term is often used for the common crystalline powder grade.