Everything below concerns Stability testing. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
In animals, creatine is synthesized mainly in liver, kidney, and pancreas from arginine, glycine, and methionine. The first committed step transfers a guanidino group from arginine to glycine, forming guanidinoacetate. Subsequent methylation by S-adenosylmethionine yields creatine. Dietary sources include meat and fish; endogenous synthesis supplies part of the body pool. Most creatine is stored in skeletal muscle, where it is converted to phosphocreatine and participates in rapid regeneration of adenosine triphosphate during short, intense activity.
Commercial creatine products appear in several forms, including monohydrate, hydrochloride, citrate, nitrate, and ethyl ester. Creatine monohydrate is the most studied form and serves as a reference material in comparative research. Different forms vary in solubility, pH, and water content, but they share creatine as the active moiety after dissolution. Claims that one form is uniformly superior remain debated, and study designs often differ in population, exercise protocol, and outcome measures. Purity and hydration state are central to interpreting product labels.
Creatine monohydrate is the hydrated form of creatine, a nitrogen-containing organic acid involved in cellular energy transfer. Its molecular formula is C4H11N3O3, and it consists of creatine plus one water molecule in the crystal lattice. The anhydrous base, creatine, has the formula C4H9N3O2. The compound appears as a white, odorless, crystalline powder and is classified as a guanidine derivative. It is distinct from creatinine, a breakdown product measured in clinical chemistry.
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 (monohydrate) | C4H11N3O3 | Includes one water molecule per creatine unit. |
| Molecular weight | 149.15 g/mol | Calculated for the monohydrate; anhydrous creatine is 131.13 g/mol. |
| Appearance | White crystalline powder | Odorless; particle size can vary by manufacturing. |
| CAS Registry Number | 6020-87-7 | Identifies creatine monohydrate; creatine base is 57-00-1. |
| Common synonyms | Creatine hydrate; methylguanidoacetic acid monohydrate | Naming varies by registry and supplier. |
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.
Solid creatine monohydrate is generally stable when kept cool and dry, but it can hydrolyze to creatinine over time. Moisture, heat, and acidic conditions accelerate this conversion, which reduces assay values and changes the material's properties. Creatinine is a cyclic dehydration product that is also a normal human metabolite, so its presence in a sample is not necessarily a health concern by itself. In quality testing, creatinine is monitored as a marker of degradation and purity.
Identity and purity are assessed with several complementary methods. High-performance liquid chromatography can separate creatine from creatinine and related impurities, often with ultraviolet detection. Nuclear magnetic resonance and infrared spectroscopy provide structural confirmation, while Karl Fischer titration measures water content. Elemental analysis and mass spectrometry may be used for additional confirmation, especially in research or forensic settings. No single method captures every quality attribute, so laboratories typically combine results and compare them against a specification.
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.
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.
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.
=== Pharmacodynamics === Compared to shorter-chain homologues such as DOM, DOET, and DOPR, which are all potent psychedelics, DOBU has even higher affinity for the serotonin 5-HT2A receptor. It has been found to act as a potent full agonist of the serotonin 5-HT2A and 5-HT2C receptors. The drug is also a serotonin 5-HT2B receptor full agonist but with far lower potency. Additional receptor interactions have also been described. DOBU fully substitutes for DOM in rodent drug discrimination tests, albeit several-fold less potently than DOET or DOPR. In addition, DOBU robustly induces the head-twitch response, a behavioral proxy of psychedelic-like effects, in rodents, and maximally does so about as strongly as other DOx drugs like DOM, DOET, DOPR, and DOC. The doses at which DOBU produces peak head twitches are similar to those of DOM and DOET. Other effects of DOBU in rodents include hyperlocomotion at lower doses, hypolocomotion at higher doses, and hypothermia at higher doses.
=== Mammals === Mammoth hemoglobin featured mutations that allowed for oxygen delivery at lower temperatures, thus enabling mammoths to migrate to higher latitudes during the Pleistocene. Hemoglobin adaptation extends to humans, as well. There is a higher offspring survival rate among Tibetan women with high oxygen saturation genotypes residing at 4,000 m. Natural selection seems to be the main force working on this gene because the mortality rate of offspring is significantly lower for women with higher hemoglobin-oxygen affinity when compared to the mortality rate of offspring from women with low hemoglobin-oxygen affinity. While the exact genotype and mechanism by which this occurs is not yet clear, selection is acting on these women's ability to bind oxygen in low partial pressures, which overall allows them to better sustain crucial metabolic processes.
=== Classification === The current classification system by the International League of Associations for Rheumatology (ILAR) recognizes seven distinct subtypes of JIA, based on their presentation within the first six months: Each subtype has a specific pattern of features as outlined in the table and descriptions below. (The seventh category, not included in the table, is 'Undifferentiated' and includes any patient with JIA who does not meet criteria for other subtypes, or who meets criteria for two or more subtypes).
The third is to use an echo-planar readout that dephases magnetization from outside the voxel, also shown to substantially reduce lipid artifacts. All three methods could be combined to overcome lipid contamination. One of the dimensions to understand about a pulse sequence is its coherence pathway. The coherence pathway is the sequence of quantum coherence number(s) the signal takes prior to its acquisition. All coherence pathways end in -1, as this is the only coherence pathway detected by quadrature coils. The spin echo-type sequences (PRESS, sLASER, LASER) simply alternate between +1 and -1. For example, the coherence pathway for PRESS (expressed as a vector) is [-1, 1, -1]. This indicates that after the initial RF pulse (excitation pulse) the spins have a -1 quantum coherence. The refocusing pulses then swap the -1 to +1, then back from +1 to -1 (where it is then detected). Similarly for sLASER the coherence pathway is [-1, 1, -1, 1, -1]. The coherence pathway for LASER is [-1, 1, -1, 1, -1, 1, -1]. The coherence pathway for sPECIAL is [0, 1, -1]. This indicates that after the first RF pulse the signal resides as a population, due to its 0 quantum coherence number. Coherence pathways are critical as the explain how the sequences are affected by crushers and phase cycling. As such, coherence pathway analysis has been used to develop optimized crusher schemes and phase cycling schemes for an arbitrary MRS experiment.
Vacancies in both houses, whether because of death or resignation of a member, must be filled by using a bypoll within six months of the vacancy; the newly elected member then only serves the remainder of the term of the seat to which they are elected. The number of seats in both houses is regulated by the Constitution and parliamentary statutes.
Sources: en.wikipedia.org
== Genetics == The number of chondrocyte cells created and their maturation process can be influenced by multiple different genes and proteins. Two proteins, bone morphogenetic protein 4 (BMP-4) and fibroblast growth factor 2 (FGF2) have been seen to influence the amount of differentiation into chondrocytes. Both proteins are known to play a role in embryonic stem cell differentiation into mesodermal cells, through signaling with BMP-4 and as FGF2 acting as a stimulator. From the mesodermal germ layer, cells will continue to differentiate down into many different types of cells. On top of BMP-4 and FGF2 stimulating the mesodermal germ layer, treatment of these proteins has also been shown to amplify the number of cells that differentiate down into chondrogenic and osteogenic cells when cultured in chondrogenic and osteogenic mediums respectively. For chondrogenic cells, the treatment showed increased expression of the transcription factor Sox9, which plays a key role in chondrogenesis, the process of cartilage formation from condensed mesenchyme tissues, which then differentiate into chondrocytes. Endochondral ossification is the process by which most vertebrate axial skeletons form into hardened bones from cartilage. This process begins with a cartilage anlage where chondrocyte cells will congregate and start their maturation process. Once the chondrocytes have fully matured at the desired rate, the cartilage tissue will harden into bone. This process is similar across most vertebrates and is closely regulated due to the large importance of the skeleton in survival.
In a speech to Mansion House, Andrew Bailey, the governor of the Bank of England, says the UK must "rebuild relations" with the EU "while respecting the decision of the British people" who voted for Brexit. Neil Gray, Scotland's Health and Social Care Secretary, apologises to the Scottish Parliament for not attending a "wider range" of football matches after he used a chauffeur driven vehicle to attend four games at Aberdeen F.C., something he says gave the impression he was acting "more as a fan and less as a minister". 15 November – A report by the National Audit Office reveals that the Home Office "cut corners" and made "poor decisions", while under pressure to stop housing migrants in hotels, when it purchased the former HM Prison Northeye for £15m in 2023; the site was derelict and contaminated with asbestos. 10 Downing Street apologises after meat and alcohol were served at a Diwali celebration held there in October. Stephen McCabe resigns as leader of Inverclyde Council after appearing in court charged with assault and threatening behaviour. Northern Ireland Communities Minister Gordon Lyons attends a football match between Northern Ireland and Belarus despite UK government guidance that the game should not go ahead because of sanctions against Belarus over its stance over the Ukraine War.
Thioesters are prominent active esters, as illustrated by the esters of coenzyme A. Terpenes and terpenoids are generated from active esters. Some biosynthetically significant active esters include isopentenyl pyrophosphate, dimethylallyl pyrophosphate, and geranyl pyrophosphate. Hydroxybenzotriazole is used in peptide synthesis by forming an active ester from acyl isoureas. Classically, activated esters are derivatives of nitrophenols and pentafluorophenol. These esters react with nucleophiles much more rapidly than the related aryl and especially alkyl esters. Active esters of acrylic acid are precursors to polymers with reactive side chains. The concept of active esters extends to esters of phosphoric and sulfuric acids. One such case is dimethylsulfate, a strong methylating agent.
In 1949, Glenn T. Seaborg, who devised the actinide concept, predicted that element 103 (lawrencium) should be the last actinide and that the Lr3+ ion should be about as stable as Lu3+ in aqueous solution. It was not until decades later that element 103 was finally conclusively synthesized and this prediction was experimentally confirmed. Studies on the element, performed in 1969, showed that lawrencium reacts with chlorine to form a product that was most likely the trichloride, LrCl3. Its volatility was found to be similar to the chlorides of curium, fermium, and nobelium and much less than that of rutherfordium chloride. In 1970, chemical studies were performed on 1500 atoms of 256Lr, comparing it with divalent (No, Ba, Ra), trivalent (Fm, Cf, Cm, Am, Ac), and tetravalent (Th, Pu) elements. It was found that lawrencium coextracted with the trivalent ions, but the short half-life of 256Lr precluded a confirmation that it eluted ahead of Md3+ in the elution sequence. Lawrencium occurs as the trivalent Lr3+ ion in aqueous solution and hence its compounds should be similar to those of the other trivalent actinides: for example, lawrencium(III) fluoride (LrF3) and hydroxide (Lr(OH)3) should both be insoluble in water. Due to the actinide contraction, the ionic radius of Lr3+ should be smaller than that of Md3+, and it should elute ahead of Md3+ when ammonium α-hydroxyisobutyrate (ammonium α-HIB) is used as an eluant.
Sources: en.wikipedia.org
In 1987, according to Department of State and congressional staff, drug traffickers were offering UMOPAR officers and town officials in the Chapare region amounts ranging from US$15,000 to US$25,000 for seventy two hours of "protection" in order to allow aircraft to load and take off from clandestine airstrips. In February 1988, the deputy minister of national defense announced that about 90 percent of UMOPAR members, including twelve middle- and high-ranking officers, had been dismissed for alleged links to drug trafficking. The La Paz newspaper Presencia reported in March 1988 that UMOPAR chiefs, including the prosecutors, were working with narcotics traffickers by returning to them the large drug finds and turning only the small ones in to the authorities. Observers considered UMOPAR forces in Santa Cruz to be more honest and dedicated. In October 1988, the undersecretary of the Social Defense Secretariat reiterated that drug traffickers had obtained the protection of important sectors of influence in Bolivia, including some military members and ordinary judges. He cited the example of Cochabamba's Seventh Division commander and four of his top officers, who were discharged dishonorably after they were found to be protecting a clandestine Chapare airstrip used by drug smugglers. The ministry official also announced that the navy was protecting drug-trafficking activities in the Puerto Villarroel area of the Chapare. For that reason, the United States suspended assistance to the navy temporarily in late 1988 until its commander was replaced.
=== Rankings === In 2022 U.S. News & World Report magazine ranked the University of Cincinnati College of Medicine as tied for 42nd best medical school nationally in research and (also tied) 59th in primary care. In addition, the College of Medicine had the third best pediatrics program in the country according to the same report.
== Veterinary use == There is limited data on nalbuphine's use in the dog, and even less for that of other animals. Nalbuphine induces sedation and analgesia in the dog but is less effective compared to μ-opioid receptor agonists. Nalbuphine has minimal effect on the cardiovascular system. The sedation provided by nalbuphine is insufficient for catheterisation and fur clipping and the analgesic effect is insufficient for some pain. Both sedative and analgesic effects of nalbuphine are subject to a ceiling effect. Combination of nalbuphine with an α2-adrenergic receptor agonist or acepromazine provides greater sedation. One study found that acepromazine and nalbuphine failed to provide adequate analgesia both during and post-surgery in bitches undergoing ovariohysterectomy. Although one study found epidural nalbuphine to provide adequate analgesia there is limited evidence to support epidural administration of nalbuphine. Ophthalmic administration is not recommended in any species as multiple studies demonstrated no analgesia following topical ophthalmic administration. In cats nalbuphine has been shown to provide an equal sedative effect to butorphanol when adminsistered with acepromazine and an equal sedative and analgesic effect when combined with dexmedetomidine and tiletamine-zolazepam respectively. In horses evidence is mixed. One study found that nalbuphine combined with xylazine was more effective than xylazine by itself as an analgesic and anaesthetic, but another study found no difference between xylazine itself and xylazine with nalbuphine.
Sources: en.wikipedia.org
Creatine is the base compound, while creatine monohydrate includes one water molecule per creatine molecule in its crystal structure. The monohydrate form is common in supplements and analytical standards. The body uses creatine itself after the water is removed or dissociated.
Yes. Meat, fish, and other animal tissues contain creatine. Cooking can convert some creatine to creatinine, which has no role in phosphocreatine energy buffering. Plant foods contain little or no creatine.
Creatinine is a cyclic breakdown product formed from creatine and phosphocreatine. It is filtered by the kidneys and commonly measured in blood and urine as a marker of renal function. Creatine monohydrate is a supplement ingredient and research chemical, not the same 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.