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.
Last reviewed on 2025-09-09. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Dry creatine monohydrate is generally stable when kept sealed and protected from heat and moisture. In solution, however, creatine undergoes a slow cyclization to creatinine, a related compound with no role in phosphocreatine storage. The rate of this conversion increases with temperature and is influenced by pH. Because creatinine is a common impurity in liquid or poorly stored products, analytical testing often measures both compounds. The crystalline monohydrate is less prone to degradation than aqueous preparations, though caking can occur if moisture enters the container.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C4H9N3O2·H2O | Monohydrate includes one water molecule per creatine molecule |
| Molar mass | 149.15 g/mol | Value for the monohydrate; anhydrous creatine is about 131.13 g/mol |
| Appearance | White crystalline powder | Odorless or nearly odorless in purified form |
| Solubility in water | About 13 g/L at 25 °C | Solubility increases with temperature and varies with pH |
| Common synonyms | Creatine hydrate; N-(aminoiminomethyl)-N-methylglycine | Monohydrate distinguishes it from anhydrous creatine |
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.
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.
Creatine monohydrate is a crystalline compound formed when one molecule of creatine binds with one molecule of water. Creatine itself is a nitrogen-containing organic acid involved in cellular energy transfer, particularly in muscle and nerve tissue. The monohydrate form is the most common solid form used in research and commercial products because it is relatively stable and easy to handle. Its molecular formula is C4H9N3O2·H2O, and its molar mass is about 149.15 grams per mole.
In the human body, creatine is synthesized mainly in the liver and kidneys from the amino acids glycine, arginine, and methionine. Dietary sources include meat, fish, and other animal tissues, which supply preformed creatine. Because plant foods contain little or no creatine, dietary intake varies widely among populations. The compound is stored largely in skeletal muscle, where it is converted to phosphocreatine and used to regenerate adenosine triphosphate during short bursts of activity.
Creatine monohydrate is one of several solid forms of creatine described in the literature. Other forms include anhydrous creatine, creatine hydrochloride, and creatine ethyl ester, each with different solubility and stability characteristics. The monohydrate is distinct from creatinine, a spontaneous breakdown compound that forms when creatine loses water and cyclizes. Commercial descriptions sometimes use synonyms such as methylguanidoacetic acid or N-(aminoiminomethyl)-N-methylglycine, which refer to the same base molecule. These names appear in chemical databases and product labels.
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.
== Examples == The following is a list of human proteins containing the protein kinase domain: AAK1 ; AATK ; ABL1 ; ABL2 ; ACVR1 ; ACVR1B ; ACVR1C ; ACVR2A ; ACVR2B ; ACVRL1 ; AKT1 ; AKT2 ; AKT3 ; ALK ; AMHR2 ; ANKK1 ; ARAF ; AURKA ; AURKB ; AURKC ; AXL ; BLK ; BMP2K ; BMPR1A ; BMPR1B ; BMPR2 ; BMX ; BRAF ; BRSK1 ; BRSK2 ; BTK ; BUB1 ; BUB1B ; CAMK1 ; CAMK1D ; CAMK1G ; CAMK2A ; CAMK2B ; CAMK2D ; CAMK2G ; CAMK4 ; CAMKK1 ; CAMKK2 ; CAMKV ; CASK ; CDC42BPA ; CDC42BPB ; CDC42BPG ; CDC7 ; CDK1 ; CDK10 ; CDK11A ; CDK11B ; CDK12 ; CDK13 ; CDK14 ; CDK15 ; CDK16 ; CDK17 ; CDK18 ; CDK19 ; CDK2 ; CDK20 ; CDK3 ; CDK4 ; CDK5 ; CDK6 ; CDK7 ; CDK8 ; CDK9 ; CDKL1 ; CDKL2 ; CDKL3 ; CDKL4 ; CDKL5 ; CHEK1 ; CHEK2 ; CHUK ; CIT ; CLK1 ; CLK2 ; CLK3 ; CLK4 ; CSF1R ; CSK ; CSNK1A1 ; CSNK1A1L ; CSNK1D ; CSNK1E ; CSNK1G1 ; CSNK1G2 ; CSNK1G3 ; CSNK2A1 ; CSNK2A2 ; CSNK2A3 ; DAPK1 ; DAPK2 ; DAPK3 ; DCLK1 ; DCLK2 ; DCLK3 ; DDR1 ; DDR2 ; DMPK ; DSTYK ; DYRK1A ; DYRK1B ; DYRK2 ; DYRK3 ; DYRK4 ; EGFR ; EIF2AK1 ; EIF2AK2 ; EIF2AK3 ; EIF2AK4 ; EPHA1 ; EPHA10 ; EPHA2 ; EPHA3 ; EPHA4 ; EPHA5 ; EPHA6 ; EPHA7 ; EPHA8 ; EPHB1 ; EPHB2 ; EPHB3 ; EPHB4 ; EPHB6 ; ERBB2 ; ERBB3 ; ERBB4 ; ERN1 ; ERN2 ; FER ; FES ; FGFR1 ; FGFR2 ; FGFR3 ; FGFR4 ; FGR ; FLT1 ; FLT3 ; FLT4 ; FRK ; FYN ; GAK ; GRK1 ; GRK2 ; GRK3 ; GRK4 ; GRK5 ; GRK6 ; GRK7 ; GSG2 ; GSK3A ; GSK3B ; GUCY2C ; GUCY2D ; GUCY2F ; HCK ; HIPK1 ; HIPK2 ; HIPK3 ; HIPK4 ; HUNK ; ICK ; IGF1R ; IKBKB ; IKBKE ; ILK ; INSR ; INSRR ; IRAK1 ; IRAK2 ; IRAK3 ; IRAK4 ; ITK ; JAK1 ; JAK2 ; JAK3 ; KALRN ; KDR ; KIT ; KSR1 ; KSR2 ; LATS1 ; LATS2 ; LCK ; LIMK1 ; LIMK2 ; LMTK2 ; LMTK3 ; LRRK1 ; LRRK2 ; LTK ; LYN ; MAK ; MAP2K1 ; MAP2K2 ; MAP2K3 ; MAP2K4 ; MAP2K5 ; MAP2K6 ; MAP2K7 ; MAP3K1 ; MAP3K10 ; MAP3K11 ; MAP3K12 ; MAP3K13 ; MAP3K14 ; MAP3K15 ; MAP3K19 ; MAP3K2 ; MAP3K20 ; MAP3K21 ; MAP3K3 ; MAP3K4 ; MAP3K5 ; MAP3K6 ; MAP3K7 ; MAP3K8 ; MAP3K9 ; MAP4K1 ; MAP4K2 ; MAP4K3 ; MAP4K4 ; MAP4K5 ; MAPK1 ; MAPK10 ; MAPK11 ; MAPK12 ; MAPK13 ; MAPK14 ; MAPK15 ; MAPK3 ; MAPK4 ; MAPK6 ; MAPK7 ; MAPK8 ; MAPK9 ; MAPKAPK2 ; MAPKAPK3 ; MAPKAPK5 ; MARK1 ; MARK2 ; MARK3 ; MARK4 ; MAST1 ; MAST2 ; MAST3 ; MAST4 ; MASTL ; MATK ; MELK ; MERTK ; MET ; MINK1 ; MKNK1 ; MKNK2 ; MLKL ; MOK ; MOS ; MST1R ; MUSK ; MYLK ; MYLK2 ; MYLK3 ; MYLK4 ; MYO3A ; MYO3B ; NEK1 ; NEK10 ; NEK11 ; NEK2 ; NEK3 ; NEK4 ; NEK5 ; NEK6 ; NEK7 ; NEK8 ; NEK9 ; NIM1K ; NLK ; NPR1 ; NPR2 ; NRBP1 ; NRBP2 ; NRK ; NTRK1 ; NTRK2 ; NTRK3 ; NUAK1 ; NUAK2 ; OBSCN ; OXSR1 ; PAK1 ; PAK2 ; PAK3 ; PAK4 ; PAK5 ; PAK6 ; PAN3 ; PASK ; PBK ; PDGFRA ; PDGFRB ; PDIK1L ; PDPK1 ; PDPK2P ; PEAK1 ; PEAK3 ; PHKG1 ; PHKG2 ; PIK3R4 ; PIM1 ; PIM2 ; PIM3 ; PINK1 ; PKDCC ; PKMYT1 ; PKN1 ; PKN2 ; PKN3 ; PLK1 ; PLK2 ; PLK3 ; PLK4 ; PLK5 ; PNCK ; POMK ; PRKAA1 ; PRKAA2 ; PRKACA ; PRKACB ; PRKACG ; PRKCA ; PRKCB ; PRKCD ; PRKCE ; PRKCG ; PRKCH ; PRKCI ; PRKCQ ; PRKCZ ; PRKD1 ; PRKD2 ; PRKD3 ; PRKG1 ; PRKG2 ; PRKX ; PRKY ; PRPF4B ; PSKH1 ; PSKH2 ; PTK2 ; PTK2B ; PTK6 ; PTK7 ; PXK ; RAF1 ; RET ; RIOK1 ; RIOK2 ; RIOK3 ; RIPK1 ; RIPK2 ; RIPK3 ; RIPK4 ; RNASEL ; ROCK1 ; ROCK2 ; ROR1 ; ROR2 ; ROS1 ; RPS6KA1 ; RPS6KA2 ; RPS6KA3 ; RPS6KA4 ; RPS6KA5 ; RPS6KA6 ; RPS6KB1 ; RPS6KB2 ; RPS6KC1 ; RPS6KL1 ; RSKR ; RYK ; SBK1 ; SBK2 ; SBK3 ; SCYL1 ; SCYL2 ; SCYL3 ; SGK1 ; SGK2 ; SGK223 ; SGK3 ; SIK1 ; SIK1B ; SIK2 ; SIK3 ; SLK ; SNRK ; SPEG ; SRC ; SRMS ; SRPK1 ; SRPK2 ; SRPK3 ; STK10 ; STK11 ; STK16 ; STK17A ; STK17B ; STK24 ; STK25 ; STK26 ; STK3 ; STK31 ; STK32A ; STK32B ; STK32C ; STK33 ; STK35 ; STK36 ; STK38 ; STK38L ; STK39 ; STK4 ; STK40 ; STKLD1 ; STRADA ; STRADB ; STYK1 ; SYK ; TAOK1 ; TAOK2 ; TAOK3 ; TBCK ; TBK1 ; TEC ; TEK ; TESK1 ; TESK2 ; TEX14 ; TGFBR1 ; TGFBR2 ; TIE1 ; TLK1 ; TLK2 ; TNIK ; TNK1 ; TNK2 ; TNNI3K ; TP53RK ; TRIB1 ; TRIB2 ; TRIB3 ; TRIO ; TSSK1B ; TSSK2 ; TSSK3 ; TSSK4 ; TSSK6 ; TTBK1 ; TTBK2 ; TTK ; TTN ; TXK ; TYK2 ; TYRO3 ; UHMK1 ; ULK1 ; ULK2 ; ULK3 ; ULK4 ; VRK1 ; VRK2 ; VRK3 ; WEE1 ; WEE2 ; WNK1 ; WNK2 ; WNK3 ; WNK4 ; YES1 ; ZAP70
==== Alternative-composition breast prosthesis ==== The third category of prosthetic breast includes alternative-composition breast prostheses that featured fillers such as soy oil, polypropylene string, ox cartilage, Terylene wool, ground rubber, silastic rubber, and Teflon-silicone, which are substances harmful to the woman's body.
==== Aplastic crisis ==== Aplastic crises are instances of an acute worsening of the patient's baseline anaemia, producing pale appearance, fast heart rate, and fatigue. This crisis is normally triggered by parvovirus B19, which directly affects production of red blood cells by invading the red cell precursors and multiplying in and destroying them. Parvovirus infection almost completely prevents red blood cell production for two to three days (red cell aplasia). In normal individuals, this is of little consequence, but the shortened red cell life of people with sickle cell disease results in an abrupt, life-threatening situation. Reticulocyte count drops dramatically during the disease (causing reticulocytopenia), red cell production lapses, and the rapid destruction of existing red cells leads to acute and severe anaemia. This crisis takes four to seven days to resolve. Most patients can be managed supportively; some need a blood transfusion.
Sources: en.wikipedia.org
==== Indications ==== Cannabidiol, available as Epidiolex® in high concentration, is a synthetic non-classical cannabinoid marketed for the treatment of refractory epilepsy in patients with Dravet syndrome (epilepsy condition since infancy), Lennox-Gastaut syndrome (severe epilepsy in children), and tuberous sclerosis (a genetic condition causing the formation of non-cancerous tumours in different body areas) in patients aged 1 or above. A reduction in the frequency seizures (uncontrolled shaking of body due to abnormal brain activity) and a better seizure control are seen among patients.
Non-contact normothermic (or nonthermal) wound therapy, also called The Warm-Up Therapy System or wound therapy with infrared radiation, is the process of increasing the temperature of the wound bed, thereby promoting increased blood flow in the area around the wound. It is a temporary therapy (usually about 72 hours for each time usage) in which the dressing contains a special electronic warming card. The card heats to 100.4 °F (38 °C), bathing the wound in radiant heat. The closely sealed wound covering promotes a moist environment in the wound bed. It is sometimes indicated in wounds that have failed to heal with conventional therapies including wounds with compromised blood flow, diabetic ulcers, and bed sores.
== Further reading == Bethe, H. A. (1939). "Energy Production in Stars". Physical Review. 55 (5): 434–56. Bibcode:1939PhRv...55..434B. doi:10.1103/PhysRev.55.434. PMID 17835673. Iben, I. (1967). "Stellar Evolution Within and off the Main Sequence". Annual Review of Astronomy and Astrophysics. 5: 571–626. Bibcode:1967ARA&A...5..571I. doi:10.1146/annurev.aa.05.090167.003035.
A glycogen storage disease (GSD, also glycogenosis and dextrinosis) is a metabolic disorder caused by a deficiency of an enzyme or transport protein affecting glycogen synthesis, glycogen breakdown, or glucose breakdown, typically in muscles and/or liver cells. GSDs are caused by Inborn errors of carbohydrate metabolism (genetically defective enzymes or transport proteins) involved in these processes. In livestock, a defect in glycogen storage is caused by intoxication with the alkaloid castanospermine. However, not every inborn error of carbohydrate metabolism has been assigned a GSD number, even if it is known to affect the muscles or liver. For example, phosphoglycerate kinase deficiency (gene PGK1) has a myopathic form. Also, Fanconi-Bickel syndrome (gene SLC2A2) and Danon disease (gene LAMP2) were declassed as GSDs due to being defects of transport proteins rather than enzymes; however, GSD-1 subtypes b, c, and d are due to defects of transport proteins (genes SLC37A4, SLC17A3) yet are still considered GSDs. Phosphoglucomutase deficiency (gene PGM1) was declassed as a GSD due to it also affecting the formation of N-glycans; however, as it affects both glycogenolysis and glycosylation, it has been suggested that it should re-designated as GSD-XIV. Jonah Pournazarian is the most notable human with Glycogen Storage Disease (GSD). His condition has been widely covered in national and international media, and his story has drawn unprecedented awareness to GSD research.
Sources: en.wikipedia.org
If analytes are too small to generate a readable signal for determining concentration, the assay matrix can be modified. CD/DVD based assays utilize the optical properties of gold. Gold nanoparticle bioconjugates are tracers used to increase the sensitivity of the assay. The gold nanoparticles can be identified with photometric or plasmonic detectors. The smaller the nanoparticles are, the more sensitive the assay becomes. Silver enhancer solution is also used to increase the reflective properties of samples. Gold nanoparticles have catalytic properties which cause them to reduce silver ions to silver metal. The silver metal deposits on the analytes and causes signals to be amplified. Silver metal is more easily detectable by cameras, scanners, or other drives than is the analyte alone. Still, this enhancement procedure requires many additional reaction and washing steps which could lead to analytical errors.
The second approach of bioprinting is autonomous self-assembly. This approach relies on the physical process of embryonic organ development as a model to replicate the tissues of interest. When cells are in their early development, they create their own extracellular matrix building block, the proper cell signaling, and independent arrangement and patterning to provide the required biological functions and micro-architecture. Autonomous self-assembly demands specific information about the developmental techniques of the tissues and organs of the embryo. There is a "scaffold-free" model that uses self-assembling spheroids that subjects to fusion and cell arrangement to resemble evolving tissues. Autonomous self-assembly depends on the cell as the fundamental driver of histogenesis, guiding the building blocks, structural and functional properties of these tissues. It demands a deeper understanding of how embryonic tissues mechanisms develop as well as the microenvironment surrounded to create the bioprinted tissues.
After Runciter disappears, Jory reveals himself to Chip, telling him that he, not Conley, has now killed off the entire group (including Conley), as he "eats" half-lifers to sustain himself, and that the entire reality they are experiencing is created and maintained by him. Fortunately, Chip is temporarily protected from being consumed through the effect of Ubik, and leaves Jory. As he at last begins to deteriorate again, he meets Ella, who saves him by granting him a certificate for a life-long supply of Ubik, and instructs him to stay half-alive and seek cans of Ubik to further assist Runciter after she herself reincarnates. She states that Jory's family pays the facility to keep his body near other half-lifers for him to consume in order to prolong his own half-life, and that entities like Jory can arise in any collection of half-lifers. Ubik is claimed to have been developed by Ella and several other half-lifers as a defense against Jory. Each chapter is introduced by a commercial advertising Ubik as a different product serving a specific use. The last chapter is introduced by Ubik claiming that it has created and directed the universe, and that its real name is unknown and unspoken. In this short chapter, Runciter, who is in the "living" world mourning the loss of his best employees, discovers coins showing Chip's face, and feels that this is "just the beginning".
Sources: en.wikipedia.org
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.
Creatine monohydrate contains creatine, but the two terms are not strictly interchangeable. The monohydrate includes water in the crystal, while creatine refers to the base molecule. Other creatine forms pair the molecule with different acids or carriers.
Dietary creatine is found mainly in meat and fish. The human body also synthesizes creatine from amino acids in the liver, kidneys, and pancreas. The monohydrate powder used in products is manufactured rather than extracted directly from food.
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.