creatine 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 2026-02-22 and is reviewed periodically as new material appears.
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.
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.
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.
| 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. |
Analytical laboratories commonly use high-performance liquid chromatography to separate creatine from creatinine and related impurities. Ion chromatography, nuclear magnetic resonance, and titration assays can also quantify the compound. Water content is measured by Karl Fischer titration or loss on drying, because the monohydrate has a defined theoretical water fraction. Particle size, bulk density, and flowability are physical properties that affect blending and capsule filling. These measurements support quality control and help verify that a lot matches its specification.
Regulatory status varies by country. In the United States, creatine monohydrate is sold as a dietary supplement ingredient, while in the European Union it is placed on the market as a food supplement component. Some jurisdictions have established purity monographs or permitted health claims, while others treat it as a novel food or require notification. Product labels may state the amount of creatine monohydrate or the equivalent creatine content, and the two figures can differ. Independent testing programs sometimes check identity, potency, and contaminant limits.
Solid creatine monohydrate is generally stable when kept dry and protected from extremes of heat and humidity. In the presence of moisture, it can gradually convert to creatinine, a cyclic dehydration product that has little value for phosphocreatine synthesis. Elevated temperatures and acidic conditions accelerate this conversion in solution. Because the reaction is slow in cool, dry storage, typical shelf lives are measured in years rather than weeks. Packaging that limits moisture and oxygen exposure helps maintain purity.
Recommended storage usually involves a sealed container kept at room temperature, away from direct sunlight and moisture. High humidity can cause caking, which changes flow properties and may complicate accurate weighing. Repeated opening of containers exposes the powder to air and moisture, so smaller aliquots can reduce handling effects. Storage temperature ranges are not absolute requirements; they reflect conditions that slow degradation and preserve consistent physical characteristics. Clean, dry tools help prevent contamination during sampling.
== Mechanism of action == Cefuroxime axetil is a second generation cephalosporin that, like penicillins antibiotics, contains a β-lactam ring structure. Cephalosporins work as bactericidal antibiotics; that by binding to penicillin-binding proteins (PBPs), inhibit the last step of the bacterial cell wall synthesis. Once the β-lactam ring binds to PBPs, cross-linking between peptidoglycan units is inhibited.
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== Veterinary uses == Thiamazole is commonly used in cats to treat hyperthyroidism. Despite 20% of cats treated with thiamazole testing positive for antinuclear antibody lupus erythematosus and immune-mediated haemolytic anemia, neither condition is associated with thiamazole in cats. Hepatic toxicity also occurs in a small but notable amount of cats treated with thiamazole. In July 2024, the US Food and Drug Administration (FDA) approved Felanorm, the first generic methimazole oral solution for the treatment of hyperthyroidism in cats. Felanorm contains the same active ingredient (methimazole) as the approved brand name drug product, Felimazole Coated Tablets, which were first approved in May 2009. In addition, the FDA determined that Felanorm contains no inactive ingredients that may significantly affect the bioavailability of the active ingredient. Felanorm is sponsored by Norbrook Laboratories based in the United Kingdom.
In January 2025, Microsoft proposed the technique rStar-Math that leverages Monte Carlo tree search and step-by-step reasoning, enabling a relatively small language model like Qwen-7B to solve 53% of the AIME 2024 and 90% of the MATH benchmark problems. Google DeepMind has developed models for solving mathematical problems: AlphaDev, AlphaEvolve, AlphaGeometry, AlphaProof, AlphaTensor, and FunSearch. When natural language is used to describe mathematical problems, converters can transform such prompts into a formal language such as Lean to define mathematical tasks. The experimental model Gemini Deep Think accepts natural language prompts directly and achieved gold medal results in the International Math Olympiad of 2025. In June 2026, an international group of mathematicians published a statement calling on mathematicians, professional organizations, and policymakers to disclose the use of AI, uphold peer review, and protect the openness and values of the discipline. In September 2026, OpenAI announced that one of their models had produced a counter-example to the Navier–Stokes existence and smoothness problem, a Millennium Prize Problem in mathematics. As of 2026, the claim has not been verified by any external mathematicians and is the subject of a priority dispute.
Ciskei ( səss-KY, siss-, -KAY, meaning on this side of [the river] Kei), officially the Republic of Ciskei (Xhosa: iRiphabliki yeCiskei), was a Bantustan for the Xhosa people, located in the southeast of South Africa. It covered an area of 7,700 square kilometres (3,000 sq mi), almost entirely surrounded by what was then the Cape Province, and possessed a small coastline along the shore of the Indian Ocean. Under South Africa's policy of apartheid, land was set aside for black peoples in self-governing territories. Ciskei was designated as one of two homelands, or "Bantustans", for Xhosa-speaking people. Xhosa people were forcibly resettled in the Ciskei and Transkei, the other Xhosa homeland. In contrast to the Transkei, which was largely contiguous and deeply rural, and governed by hereditary chiefs, the area that became the Ciskei had initially been made up of a patchwork of "reserves", interspersed with pockets of white-owned farms. In Ciskei, there were elected headmen and a relatively educated working-class populace, but there was a tendency of the region's black residents—who often worked in East London, Queenstown, and King Williams Town—to oppose traditional methods of control. These differences have been posited as the reason for two separate homelands for the Xhosa people being developed, as well as the later nominal independence of Ciskei from South Africa, than Transkei.
Sources: en.wikipedia.org
SpyTag and SpyCatcher were formed from the splitting and engineering of the CnaB2 domain of the FbaB protein from Streptococcus pyogenes, which naturally forms an intramolecular isopeptide bond to assist colonization of the host cell. With the formation of the isopeptide bond, the CnaB2 domain becomes more tolerant to conformational, thermal and pH changes. Building upon this, SpyTag was obtained from CnaB2 by extracting the C-terminal beta strand containing the reactive aspartic acid at D556 and leaving the rest of the beta strands containing the reactive lysine K470 and the catalytic glutamic acid at E516 to become SpyCatcher, after further engineering to remove some hydrophobic surface residues. The resulting SpyTag/SpyCatcher can react to form the isopeptide bond with a second-order rate constant of 1.4 ± 0.4 × 103 M−1 s−1. It is postulated that the reaction mechanism proceeds by a nucleophilic attack on D556 from K470, mediated by E516. By reconstituting SpyTag:SpyCatcher, the resulting conjugated complex acquires the stability of the parent CnaB2 domain. A second generation SpyTag/SpyCatcher called SpyTag002/SpyCatcher002 was then created through phage display that enables the peptide-protein pair to react up to 12 times faster than the original pair, at a rate constant of 2.0 ± 0.2 × 104 M−1 s−1. The second generation SpyCatcher002 also has abolished self-reactivity that is present with SpyCatcher. A third generation SpyTag/SpyCatcher called SpyTag003/SpyCatcher003 has now also been created through rational design.
Baiye, qianzhang, or gandoufu (百葉; 千張; 乾豆腐) is a very flat (about 2 mm thick) type of extra-firm tofu. It cannot be crumbled. The surface is filled with bulges arranged in a square grid from the muslin used to press it. It can be cut into long strings with a cross-section smaller than 2 mm × 2 mm and eaten in a way similar to gansi. It is also used to make：
=== Quartz fiber filter === Quartz fiber filter paper has a high resistance to chemicals, does not absorb NOx and SOx dioxides, is unaffected by humidity and is easily sterilized. Thus, it is mostly used for air pollution analysis.
=== Skin health === The estrogen receptor, as well as the progesterone receptor, have been detected in the skin, including in keratinocytes and fibroblasts. At menopause and thereafter, decreased levels of female sex hormones result in atrophy, thinning, and increased wrinkling of the skin and a reduction in skin elasticity, firmness, and strength. These skin changes constitute an acceleration in skin aging and are the result of decreased collagen content, irregularities in the morphology of epidermal skin cells, decreased ground substance between skin fibers, and reduced capillaries and blood flow. The skin also becomes more dry during menopause, which is due to reduced skin hydration and surface lipids (sebum production). Along with chronological aging and photoaging, estrogen deficiency in menopause is one of the three main factors that predominantly influences skin aging. Hormone replacement therapy consisting of systemic treatment with estrogen alone or in combination with a progestogen, has well-documented and considerable beneficial effects on the skin of postmenopausal women. These benefits include increased skin collagen content, skin thickness and elasticity, and skin hydration and surface lipids. Topical estrogen has been found to have similar beneficial effects on the skin. In addition, a study has found that topical 2% progesterone cream significantly increases skin elasticity and firmness and observably decreases wrinkles in peri- and postmenopausal women.
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.
It is a solid form of creatine that contains one water molecule per creatine molecule in the crystal lattice. The hydrate water is part of the crystal structure rather than loose moisture. The term is often used for the common crystalline powder grade.