Everything below concerns Karl Fischer titration. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-12-01. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Creatine monohydrate is a crystalline compound formed when one molecule of creatine associates with one molecule of water in the solid lattice. Its molecular formula is C4H11N3O3, and its molar mass is about 149.15 grams per mole. The material appears as a white, odorless powder that dissolves sparingly in water at room temperature. The monohydrate designation distinguishes it from anhydrous creatine, which lacks the bound water and has a lower molar mass. This hydrate is the most common commercial form of creatine used in nutritional and research settings.
Creatine is synthesized endogenously in humans, mainly in the liver, kidney, and pancreas, from the amino acids arginine, glycine, and methionine. Skeletal muscle stores much of the body's creatine, where it participates in the phosphocreatine system that buffers adenosine triphosphate during short, intense contractions. Dietary sources include meat and fish, so omnivorous diets provide additional creatine beyond endogenous production. Supplemental creatine monohydrate supplies the same molecule found in food and tissues, not a distinct drug or hormone. Research interest centers on its role in cellular energy transfer and its effects on muscle and other tissues.
Several creatine forms are sold, including monohydrate, anhydrous, hydrochloride, nitrate, citrate, and blends. Once dissolved, these forms deliver creatine, but they differ in molar mass, solubility, counterions, and water content. Creatine monohydrate has the largest body of published human data among these forms. Questions remain about whether any alternative form offers meaningful advantages in absorption, tolerability, or tissue uptake under practical conditions. The hydrate form's lower creatine content by mass is a compositional fact, not a statement about effectiveness.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C4H9N3O2·H2O | Monohydrate; anhydrous base is C4H9N3O2 |
| Molar mass | 149.15 g/mol | Calculated for the monohydrate form |
| Appearance | White crystalline powder | Typical laboratory and food-grade material |
| Solubility in water | Sparingly soluble at room temperature | Solubility increases with temperature |
| Common synonyms | Methylguanidoacetic acid; N-(aminoiminomethyl)-N-methylglycine | Synonyms refer to the creatine base, not the hydrate specifically |
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.
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.
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.
=== Mid-20th century === Public events in Bryant Park were held through the mid-20th century. For instance, in 1944 during World War II, an aircraft demonstration was held in the park. Outdoor summer concerts in Bryant Park were started in 1948 by Philip Lieson Miller, a musicologist at the New York Public Library. These concerts took place from 12 to 2 p.m. on weekdays from July through September. On October 15, 1969, forty thousand people attended a rally in Bryant Park as part of the nationwide Moratorium to End the War in Vietnam. Another large event, the Big Apple Circus, was proposed to be held in Bryant Park in 1978, but parks commissioner Gordon Davis denied the circus permission to host a show there, since it would have closed off Bryant Park to the public. Plans to build parking garages under Bryant Park also surfaced in the mid-20th century, as a means of relieving parking shortages in Midtown Manhattan. The first such plan was made in 1946 when the city conducted a survey to determine the feasibility of such a garage. Parks commissioner Moses opposed the plan. A parking garage was proposed again in 1958, with plans for 1,200 spaces, though Moses also opposed this proposal. This proposal was backed by the Avenue of the Americas Association. However, though Mayor Robert F. Wagner Jr. supported the proposal, the New York City Planning Commission voted against it in November 1961.
=== Subclinical === Subclinical hypothyroidism is a biochemical diagnosis characterized by an elevated serum TSH level, but with a normal serum free thyroxine level. The incidence of subclinical hypothyroidism is estimated to be 3-15% and a higher incidence is seen in elderly people, females and those with lower iodine levels. Subclinical hypothyroidism is most commonly caused by autoimmune thyroid diseases, especially Hashimoto's thyroiditis. The presentation of subclinical hypothyroidism is variable and classic signs and symptoms of hypothyroidism may not be observed. Of people with subclinical hypothyroidism, a proportion will develop overt hypothyroidism each year. In those with detectable antibodies against thyroid peroxidase (TPO), this occurs in 4.3%, while in those with no detectable antibodies, this occurs in 2.6%. In addition to detectable anti-TPO antibodies, other risk factors for conversion from subclinical hypothyroidism to overt hypothyroidism include female sex or in those with higher TSH levels or lower level of normal free T4 levels. Those with subclinical hypothyroidism and detectable anti-TPO antibodies who do not require treatment should have repeat thyroid function tested more frequently (e.g. every 6 months) compared with those who do not have antibodies.
== Natural occurrences == Idaein is the main anthocyanin compound in lingonberries (Vaccinium vitis-idaea), and the name of the compound is derived from the Latin name of the plant. It is also present as one of the many anthocyanins compounds found in bilberries (Vaccinium myrtillus) and cranberries (Vaccinium macrocarpon). Idaein is the main anthocyanin in red-skinned or red-fleshed (for example Weirouge or Surprise) apple varieties. It is also found in Chinese hawthorn fruits (Crataegus spp.). It is also the pigment in the copper beech (cultivar of Fagus sylvatica), that was identified in 1932. Quintinia serrata, the tawheowheo, a species of evergreen trees endemic to New Zealand, has different patterns of anthocyanins (cyanidin 3-O-glucoside and cyanidin 3-O-galactoside) in its leaves to protect the shade-adapted chloroplasts from direct sunlight.
Sources: en.wikipedia.org
ClCH2CO2H + Na2S2O3 → Na[O3S2CH2CO2H] + NaCl Na[O3S2CH2CO2H] + H2O → HSCH2CO2H + NaHSO4 Organolithium compounds and Grignard reagents react with sulfur to give the thiolates, which are readily hydrolyzed:
The third major group of regulatory RNAs is called enhancer RNAs. It is not clear at present whether they are a unique category of RNAs of various lengths or constitute a distinct subset of lncRNAs. In any case, they are transcribed from enhancers, which are known regulatory sites in the DNA near genes they regulate. They up-regulate the transcription of the gene(s) under control of the enhancer from which they are transcribed.
=== Approval ratings === Polling conducted in August 2011 by Public Policy Polling found that Sanders's approval rating was 67% and his disapproval rating 28%, making him then the third-most popular US senator. Both the NAACP (National Association for the Advancement of Colored People) and the NHLA (National Hispanic Leadership Agenda) have given him 100% voting scores during his tenure in the Senate. In 2015, he was named one of the Top 5 of The Forward 50. In a November 2015 Morning Consult poll, he reached an 83% approval rating among his constituents, making him the most popular US senator. As of 2026, polling by the Morning Consult found Sanders was still the most popular U.S. senator, with 68% approval among Vermont voters. In March 2017, Fox News found him to have the highest net favorability of any prominent politician included in its poll, at +28 points. He ranked third in 2014 and first in both 2015 and 2016. In April 2017, a nationwide Harvard-Harris Poll found that Sanders had the highest favorability rating of any political figure included in the poll, a standing confirmed by subsequent polling.
Sources: en.wikipedia.org
[L] should be read as "the concentration of L" and likewise for the other terms in square brackets. The expression can be greatly simplified by removing those terms which are constant. The number of water molecules attached to each metal ion is constant. In dilute solutions the concentration of water is effectively constant. The expression becomes
=== Infrared spectroscopy === In the case of oxidizing treatments, spectra taken from treated surfaces will indicate the presence of functionalities in carbonyl and hydroxyl regions according to the Infrared spectroscopy correlation table.
Pheochromocytoma Prolactin-dependent tumors such as pituitary prolactinomas and breast cancer Long QT syndrome Coma Circulatory collapse Subcortical brain damage Blood dyscrasia Parkinson's disease Dementia with Lewy bodies
=== Glycosides === Astilbin is the 3-O-rhamnoside of taxifolin. Taxifolin deoxyhexose can be found in açai fruits. Taxifolin 3-O-glucoside isomers have been separated from Chamaecyparis obtusa. (-)-2,3-trans-Dihydroquercetin-3'-O-β-D-glucopyranoside, a taxifolin glucoside has been extracted from the inner bark of Pinus densiflora and can act as an oviposition stimulant in the cerambycid beetle Monochamus alternatus. (2S,3S)-(-)-Taxifolin-3-O-β-D-glucopyranoside has been isolated from the root-sprouts of Agrimonia pilosa. (2R,3R)-Taxifolin-3'-O-β-D-pyranoglucoside has been isolated from the rhizome of Smilax glabra. Minor amount of taxifolin 4′-O-β-glucopyranoiside can be found in red onions. (2R,3R)-Taxifolin 3-O-arabinoside and (2S,3S)-taxifolin 3-O-arabinoside have been isolated from the leaves of Trachelospermum jasminoides (star jasmine).
Sources: en.wikipedia.org
Creatine monohydrate is the hydrated solid form of creatine, a nitrogen-containing compound involved in cellular energy metabolism. It consists of one creatine molecule associated with one water molecule in a crystal lattice.
No. Creatinine is a breakdown product formed when creatine loses water and cyclizes, and it is not the same compound. The two names are similar but refer to different chemical structures and roles.
The body synthesizes creatine from amino acids, mainly in the liver and kidneys. It also comes from animal foods such as meat and fish, while plant foods contain little or none.
It is the hydrated crystalline form of creatine, containing one bound water molecule per creatine unit. The compound is commonly used as a nutritional ingredient and as a research material.