If you have been reading about creatine 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 2025-09-21. 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.
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.
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.
| 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. |
In solid form, creatine monohydrate is relatively stable when kept dry and away from heat. Moisture and elevated temperatures promote cyclization into creatinine, a related compound with no role in the phosphagen system. Degradation accelerates in aqueous solution, where the conversion can occur within hours to days depending on pH and temperature. Manufacturers typically recommend storage in sealed containers at room temperature, with relative humidity below 50 percent. Long-term stability data for opened containers are limited.
Analytical methods for creatine monohydrate focus on identity, purity, and degradation products. High-performance liquid chromatography with ultraviolet detection is common, often at a wavelength near 210 nanometers. Titration and nuclear magnetic resonance spectroscopy can also quantify the parent compound. Pharmacopeial monographs specify tests for appearance, solubility, water content, and related substances, including creatinine. Purity values above 99 percent are typical for pharmaceutical-grade material, though supplement-grade products vary. Independent verification can detect label discrepancies.
Sourcing and verification of creatine monohydrate involve both manufacturing origin and third-party testing. Industrial production commonly starts with sarcosine and cyanamide, followed by crystallization to obtain the monohydrate. Some products are derived from animal sources, while others are synthesized from non-animal precursors. Certificates of analysis report assay, heavy metals, and microbial limits. Regulations differ by country: in the United States it is sold as a dietary supplement, whereas in the European Union it falls under food supplement rules.
Stability studies examine how creatine monohydrate changes under controlled temperature and humidity. The solid is generally stable when kept dry, but moisture can promote hydrolysis to creatinine, especially in solution or at elevated temperatures. Color, odor, and assay values are monitored over time to detect degradation. Because degradation pathways depend on storage conditions, shelf-life claims should specify the tested packaging, temperature, and humidity. Open questions remain about the long-term behavior of different crystal habits and particle sizes.
Regulatory treatment of creatine monohydrate varies by country and intended use. In some jurisdictions it is sold as a dietary supplement, while in others it may be treated as a food ingredient or a pharmaceutical raw material. Pharmacopeial monographs, where available, define identification, assay limits, and impurity thresholds. Manufacturers often follow these monographs or internal specifications to ensure batch-to-batch consistency. Analytical method validation is important because different methods can yield different apparent purity values if sample preparation or detection conditions are not controlled.
Quality control for creatine monohydrate begins with identity confirmation and assay determination. Laboratories commonly use high-performance liquid chromatography with ultraviolet detection, often after derivatization or using a suitable column, to quantify creatine. Karl Fischer titration measures water content, which helps verify the monohydrate stoichiometry. Additional tests screen for heavy metals, residual solvents, and microbial contamination depending on the intended use. These tests establish composition and purity rather than biological effect.
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.
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.
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.
Cholestasis can be suspected when there is an elevation of both 5'-nucleotidase and ALP enzymes. With a few exceptions, the optimal test for cholestasis would be elevations of serum bile acid levels. However, this is not normally available in most clinical settings necessitating the use of other biomarkers. If 5' nucleosidase and ALP enzymes are elevated, imaging studies such as computed tomography (CT) scan, ultrasound, and magnetic resonance imaging (MRI) are used to differentiate intrahepatic cholestasis from extrahepatic cholestasis. Additional imaging, laboratory testing, and biopsies might be conducted to identify the cause and extent of cholestasis.
1 On 27 April 2010, Troy Buswell resigned from the ministry following questions arising from a personal affair with Greens MP Adele Carles. The following day, Premier Colin Barnett assumed the role of Treasurer, while Buswell's remaining portfolios were transferred to Bill Marmion, who had hitherto been a parliamentary secretary.
A third type of hallucinogenic mushroom is hallucinogenic bolete mushrooms such as Lanmaoa asiatica, which are said to cause people to experience Lilliputian hallucinations. These mushrooms have unknown constituents and an unknown mechanism of action, but appear to be distinct in their properties and effects from other hallucinogenic mushrooms and are currently being researched.
== Other uses == Pregnancy tests may be used to predict if a pregnancy is likely to continue or is abnormal. Miscarriage, or spontaneous abortion or pregnancy loss, is common in early pregnancy. Serial quantitative blood tests may be done, usually 48 hours apart, and interpreted based on the knowledge that hCG in a viable normal pregnancy rises rapidly in early pregnancy. For example, for a starting hCG level of 1,500 mIU/ml or less, the hCG of continuing, normal pregnancy will increase at least 49% in 48 hours. However, for pregnancies with a higher starting hCG, between 1,500 and 3,000 mIU/ml, the hCG should rise at least 40%; for a starting hCG greater than 3,000 mIU/ml, the hCG should increase at least 33%. Failure to rise by these minimums may indicate that the pregnancy is not normal, either as a failed intrauterine pregnancy or a possible ectopic pregnancy. Ultrasound is also a common tool for determining viability and location of a pregnancy. Serial ultrasound may be used to identify non-viable pregnancies, as pregnancies that do not grow in size or develop expected structural findings on repeated ultrasounds over a 1–2 week interval may be identified as abnormal. Occasionally, a single ultrasound may be used to identify a pregnancy as non-viable; for example, an embryo that is greater than a certain size but that lacks a visible heart beat may be confidently determined to be not viable without the need for follow up ultrasound for confirmation.
Sources: en.wikipedia.org
In 2009, at least three stores in Seattle were de-branded to remove the logo and brand name, and remodel the stores as local coffee houses "inspired by Starbucks". CEO Howard Schultz called the unbranded stores a "laboratory for Starbucks". The first, 15th Avenue Coffee and Tea, opened in July 2009 on Capitol Hill. It served wine and beer and hosted live music and poetry readings. It has since been remodeled and reopened as a Starbucks-branded store. Another is Roy Street Coffee and Tea at 700 Broadway E., also on Capitol Hill. Although the stores have been called "stealth Starbucks" and criticized as "local-washing", Schultz said, "It wasn't so much that we were trying to hide the brand, but trying to do things in those stores that we did not feel were appropriate for Starbucks."
The autopsy report of the Office of the Medical Investigator of New Mexico noted that "the decedent did not have a regular physician and no medical records, particularly electrocardiograms or blood pressure readings were available for review" and "the best determination is that of unclassified cardiomyopathy which resulted in a cardiac dysrhythmia during exertion." However, Dr. James O'Keefe Jr., the director of Preventative Cardiology Fellowship Program and the Director of Preventative Cardiology at Cardiovascular Consultants at the Saint Luke's Mid America Heart Institute, a large cardiology practice in Kansas City, looked at the pathology report and believes that Micah True's enlarged thickened heart with scar tissue is a pathology some extreme endurance athletes develop termed Phidippides cardiomyopathy by Peter A. McCullough in research conducted with Justin E. Trivax. According to McCullough and Trivax's hypothesis, "this pathology occurs because endurance sports call for a sustained increase in cardiac output for several hours" which puts the heart "into a state of volume overload.
Inspired by their colleagues in Buffalo, workers at a Starbucks store in Mesa, Arizona, petitioned the NLRB for a union election on November 18, 2021, to be represented by Workers United. The organizing at the Mesa location stemmed from, in part, a well-liked manager being terminated after whistle-blowing on Starbucks' anti-union plan. Starbucks temporarily closed two stores participating in the union drive in October for renovations. The company claimed these closures were unrelated to the unionization efforts. Starbucks began working with Littler Mendelson, a self-described "union-busting firm", in October. Starbucks requested that the National Labor Relations Board include all Buffalo Starbucks locations in the union vote, however, the NLRB rejected this argument and declared store by store elections. Finally, on December 9, 2021, the workers at the Elmwood Avenue store became the first unionized Starbucks workers at a Starbucks owned location in the United States with a 19–8 vote. The Camp Road location voted 12–8 not to be in the union. Starbucks does have unionized locations in other countries. On December 13, workers at two Boston area locations petitioned the NLRB for union elections to be unionize with Workers United. The workers cited the win in Buffalo as inspiration for organizing. Workers in at least one location had most cards signed within a day. In February 2022, Starbucks fired seven workers in Memphis who had led the unionization effort and temporarily closed the store.
Sources: en.wikipedia.org
=== 1978 === January 29: The Chadian–Libyan conflict begins over the Aouzou Strip. March 15: The Ogaden War ends with a cease-fire. March 16: Italian Prime Minister Aldo Moro is kidnapped in Rome by a far-left extremist terrorist group called the Red Brigades. His body would be found on the 9th of May after 55 days of captivity. April 27: President of Afghanistan Sardar Mohammed Daoud's government is overthrown when he is murdered in a coup led by pro-communist rebels. May 11: The second rebellion in the Shaba Province, Zaire occurred. October 1: Tuvalu becomes independent from the UK as a member of the Commonwealth. November 3: Dominica becomes independent from the UK. December 18: Deng Xiaoping announces the reform and opening up of China. December 25: Vietnam invades Cambodia.
== Further reading == Wang, Juan; Li, Yuan Zhi; Chen, Ren Ren; Bao, Jin Yong; Yang, Gong Ming (January 2007). "Comparison of volatiles of banana powder dehydrated by vacuum belt drying, freeze-drying and air-drying". Food Chemistry. 104 (4): 1516. doi:10.1016/j.foodchem.2007.02.029. von Meysenbug, L.; Fine, Archie (May 1936). "Banana powder and the fecal flora of infants". The Journal of Pediatrics. 8 (5): 630. doi:10.1016/S0022-3476(36)80163-2.
==== MeSH D08.811.739 – recombinases ==== MeSH D08.811.739.250 – holliday junction resolvases MeSH D08.811.739.500 – integrases MeSH D08.811.739.500.667 – transposases MeSH D08.811.739.500.667.500 – hiv integrase MeSH D08.811.739.650 – rec a recombinases MeSH D08.811.739.650.500 – rad51 recombinase MeSH D08.811.739.800 – transposon resolvases MeSH D08.811.739.900 – vdj recombinases
=== Aurore Adekunle === Aurore Adekunle (Faith Alabi) is a Tory MP. She is introduced in series 2 as an ally of Anna Gearing, joining her on a duck shoot in Wales hosted by Pierpoint for investors in healthcare startup Rican. Gus strikes up a friendship with Aurore at the shoot, and she hires him to work at her government office to help handle her mounting meetings with constituents. Gus later leaks to Harper that the government is allowing Amazon to acquire drugstore chain FastAide, jeopardizing Jesse's planned short of the company; Harper tells Jesse, who criticizes the acquisition on live TV, thereby reviving the government inquiry—boosting Aurore's reputation—while saving his own short. Aurore, however, is forced to fire Gus after he lets slip that he was the source of the leak, even though the information ended up helping her. Aurore reappears in series 3, having been promoted to Energy Secretary; she publicly champions Henry Muck's green-energy startup Lumi, while privately scheming with Henry's uncle Lord Norton and godfather Otto Mostyn to elevate her own position in government. Aurore publicly takes responsibility for Lumi's collapse during a government inquest, thereby positioning her for a future bid for Prime Minister. She and Norton later capitalize on the news of Barclays' failed acquisition of Pierpoint, framing it in the news as an antitrust win for Aurore. Aurore does not appear in series 4, with Lord Norton describing her as "hated" by the Conservative Party and was targeted by the 1922 Committee.
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.
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.