Nitrogenous organic acid raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-11-21 and is reviewed periodically as new material appears.
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 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.
| 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 |
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.
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 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.
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.
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.
=== Elucidation of mechanism of action === Seminal studies that uncovered the mechanism of action for isoniazid were largely performed in M. smegmatis, a model for the slow-growing M. tuberculosis. In 1992, Stewart Cole and colleagues discovered that isoniazid was active in resistant M. smegmatis only when KatG, a catalase-peroxidase, was expressed; KatG is now understood to be critical for the metabolism of the prodrug isoniazid into its active forms.. At the Albert Einstein College of Medicine, William R. Jacobs Jr. and coworkers discovered that inhA—which they also found to encode an NADH-specific enoyl-acyl carrier protein reductase—as isoniazid's primary target The isoniazid-NAD adduct was also shown to bind and inhibit InhA, the protein product of inhA.
Each radioligand therapy requires significant patient testing and eligibility requirements before administration. Radioligand therapies for cancer treatment are not the first course of action and generally require the patient to have undergone other previous treatments and many diagnostic imagings (i.e. seeing if specific receptors or antigens exist) to determine the benefit vs. adverse effect of undergoing the radioligand therapy. For example, the PSMA radioligand therapy (Pluvicto) requires the patient to have end-stage prostate cancer that has metastasized in other organs, the PSMA ligand (confirmed through diagnostic imaging), and gone through hormonal therapies and chemotherapies. For patient eligibility to get Lutathera radioligand therapy the patient must have disease progression despite receiving somatostatin analog therapy (octreotide or lanreotide), have a locally advanced, inoperable, or metastatic well-differentiated disease, and have an Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2.
== Tissue distribution == IGFBP-3 mRNA is expressed in all tissue examined, with kidney, stomach, placenta, uterus and liver showing highest expression in rat tissues. Rat liver IGFBP-3 mRNA is found in nonparenchymal cells including sinusoidal endothelium, but not in hepatocytes. In contrast, human hepatocytes do express IGFBP-3.
Sources: en.wikipedia.org
Sepharose is a tradename for a crosslinked, beaded-form of agarose, a polysaccharide polymer material extracted from seaweed. Its brand name is a portmanteau derived from Separation-Pharmacia-Agarose. A common application for the material is in chromatographic separations of biomolecules. Sepharose is a registered trademark of Cytiva (formerly: GE Healthcare and Pharmacia, Pharmacia LKB Biotechnology, Pharmacia Biotech, Amersham Pharmacia Biotech, and Amersham Biosciences). Various grades and chemistries of sepharose are available. Iodoacetyl functional groups can be added to selectively bind cysteine side chains and this method is often used to immobilize peptides. Sepharose/agarose, combined with some form of activation chemistry, is also used to immobilize enzymes, antibodies and other proteins and peptides through covalent attachment to the resin. Common activation chemistries include cyanogen bromide (CNBr) activation and reductive amination of aldehydes to attach proteins to the agarose resin through lysine side chains.
On 26 February, Agüero's sisters Natalia Agüero and Celeste Severín gave an impact testimony, saying that they do not believe their sister is a murderer, and asked for her acquittal. Natalia Agüero highlighted Brenda's upbringing with their parents and the impact that their divorce had on her. She also told of their time in Buenos Aires and then back in Río Ceballos and how Brenda allegedly dedicated herself to her job. Celeste Severín said that her sister is a perejil (lit. parsley) which is Argentinian slang for "fool", and was allowed to hug Brenda before exiting the courtroom. On 10 March, the Homicides Division of Córdoba Police presented another report accusing Agüero of being the only person with an "active participation" in every case. The investigators highlighted that in the case of 1 May 2022 (baby G.H.), Agüero predicted that the baby would decompensate, even when the baby was healthy and without any complications. On 11 March, the prosecution presented a series of photographs taken from Agüero's cell phone. The court chose three of those for evaluation by psychologists and psychiatrists: one photo of babies in incubators, another picture of a vial of vitamin K, and a third picture that showed the hand of a baby with three red spots on it. Said evaluators found that the pictures relate closely to Agüero's psychopathic personality, especially under the lack of empathy shown to the families of the victims. On 15 April, Agüero began her final statement before the court, where she denied committing the murders.
Conservatives offered Thorpe the Home Office if he would join a coalition government with Heath. Thorpe was personally in favour of it, but the party insisted it would only agree pending a clear government commitment to introducing proportional representation (PR) and a change of prime minister. The former was unacceptable to Heath's cabinet and the latter to Heath personally, so the talks collapsed. Instead, a minority Labour government was formed under Harold Wilson but with no formal support from Thorpe. In the October 1974 general election, the Liberals total vote slipped back slightly (and declined in each of the next three) and the Labour government won a wafer-thin majority. Thorpe was subsequently forced to resign after allegations that he attempted to have his homosexual lover murdered by a hitman. The party's new leader, David Steel, negotiated the Lib–Lab pact with Wilson's successor as prime minister, James Callaghan. According to this pact, the Liberals would support the government in crucial votes in exchange for some influence over policy. The agreement lasted from 1977 to 1978, but proved mostly fruitless, for two reasons: the Liberals' key demand of PR was rejected by most Labour MPs, whilst the contacts between Liberal spokespersons and Labour ministers often proved detrimental, such as between Treasury spokesperson John Pardoe and Chancellor of the Exchequer Denis Healey, who were mutually antagonistic.
Sources: en.wikipedia.org
On the campaign trail, Talarico often tells a story from when he was a middle school teacher about a student who was kicked out of fifth grade for bringing a knife to school and threatening his teacher. Talarico later had the boy as a student and said that his behavior improved before he got into a fight and was kicked out of school again. Talarico blamed the events on the Texas legislature cutting public school funding, which he said led to the school's therapist being laid off. Since Talarico won the nomination, his campaign has been noted for its record-breaking fundraising. In the first quarter of 2026, it raised over $27 million, more than any Senate campaign ever for that period, and more than double the totals raised by the two previous Democratic nominees' campaigns in Texas during the same period, with Colin Allred raising $9.5 million in the first quarter of 2024, and Beto O'Rourke raising $6.7 million in 2018.
=== Pharmacokinetics === Lercanidipine is slowly but completely absorbed from the gut. It has a total bioavailability of 10% due to an extensive first-pass effect, or up to 40% if taken after a fatty meal. Highest blood plasma levels are reached after 1.5 to 3 hours. The substance is quickly distributed into the tissues and bound to lipid membranes, where it forms a depot. The circulating fraction is almost completely (>98%) bound to plasma proteins. It is completely metabolized in the liver, mainly via CYP3A4. Elimination half-life is 8 to 10 hours, and the drug does not accumulate. Because of the depot effect, the antihypertensive action lasts for at least 24 hours. 50% is excreted via the urine.
=== Modern ciders === Modern ciders are made from culinary apples and are lower in tannins and higher in acidity than other cider styles. Common culinary apples used in modern ciders include McIntosh, Golden Delicious, Jonagold, Granny Smith, Gala, and Fuji. A sweet or low alcohol cider may tend to have a strong aromatic and flavour character of apple, while drier and higher alcohol ciders will tend to produce a wider range of fruity aromas and flavours. Modern ciders vary in color from pale to yellow and can range from brilliant to a hazy clarity. Clarity can be altered through various cider making practices, depending on the cider maker's intentions. There are even Rosé ciders from apples where the skins and flesh are red.
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.
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.