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.
Last reviewed on 2025-08-31. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C4H11N3O3 | Often written C4H9N3O2·H2O |
| Molar mass | 149.15 g/mol | Anhydrous creatine is 131.13 g/mol |
| Appearance | White crystalline powder | Odorless, fine or granular |
| Water solubility | About 13 g/L at 25 °C | Low; increases with temperature |
| Common synonyms | Creatine hydrate; N-carbamimidoylsarcosine monohydrate | CAS 6020-87-7 |
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.
Creatine monohydrate is sold as a dietary ingredient in some countries and as a food supplement in others. Regulatory frameworks vary, so purity limits, labeling rules, and permitted claims are not globally uniform. In the United States, it falls under dietary supplement rules, whereas the European Union treats it as a food supplement ingredient. Pharmacopeial monographs, where they exist, can provide public quality standards, but not every product is required to meet them. Questions about long-term effects and patterns of use remain areas of active study rather than settled regulatory findings.
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.
== History == Finasteride was the first 5-ARI to be introduced for medical use. It was marketed for the treatment of BPH in 1992 and was subsequently approved for the treatment of pattern hair loss in 1997. Epristeride was the second 5-ARI to be introduced and was marketed for the treatment of BPH in China in 2000. Dutasteride was approved for the treatment of BPH in 2001 and was subsequently approved for pattern hair loss in South Korea in 2009 and in Japan in 2015. The patent protection on finasteride and dutasteride has expired and both drugs are available as generic medications.
As with any sterilisation method, a very small proportion of germs may survive the process, and cause a fraction of the irradiated products to spoil anyway. The risk comes from the false sense of security. As mentioned above, the treatment only preserves the freshness of the product at the moment it reaches the factory. If it has already lost some of its qualities, this will not be restored, and may even be hidden by the packaging. While the purpose of the irradiation is to degrade the DNA/RNA of contaminating germs, a small proportion of the nutrient load is also degraded in the process. In particular, vitamins, whole proteins and aromatic molecules. The irradiation creates highly reactive radicals, which would cause problems if the food is consumed immediately after being irradiated.
=== Other === Bone grafts are used in hopes that the defective bone will be healed or will regrow with little to no graft rejection. Besides the main use of bone grafting – dental implants – this procedure is used to fuse joints to prevent movement, repair broken bones that have bone loss, and repair broken bone that has not yet healed. Furthermore, bone grafts or substitutes are widely used for augmentation of spinal fusion procedures.
== Personal life == Schymanski is married to Stan Schymanski, an ecohydrologist. and he has shared insight about dual career couples and their path to positions in Luxembourg. They are the first dual career couple to both receive the FNR ATTRACT award.
Galloway was defeated at the 2015 general election. Naz Shah won a majority of 11,420 votes over him, reversing the majority of 10,000 votes he had gained at the by-election three years earlier. On 10 May 2015, Galloway announced an intention to challenge the result, alleging that false statements and malpractice related to postal votes during the campaign meant that the result of the election should be set aside, but did not do so. The Fawcett Society expressed concern that "the continued opposition of the unsuccessful Respect Party candidate George Galloway, to Shah's election is the culmination of a sexist electoral campaign by Galloway". In July 2015, Jeremy Corbyn said he thought "... the tactics he used against our candidate, were appalling. I was quite shocked; it was appalling." It emerged in January 2017 that Galloway's reimbursed expense claim for the rent of his constituency office in Bradford West has been forwarded by the Independent Parliamentary Standards Authority (IPSA) to the Metropolitan Police, which was then at the early assessment stage.
Sources: en.wikipedia.org
In March 2024, the Japanese Ministry of Health ordered stores to remove three RYR dietary supplements (Benikoji ColesteHelp, NaishiHelp Plus Cholesterol and Natto-kinase Sarasara Tsubu) produced by Kobayashi Pharmaceutical after reports of thousands made ill. Over a hundred people between the ages of 40 and 80 were hospitalized, and five had died as of 29 March, with four of them from kidney problems. There have been more than twelve thousand cases of health problems reported by users. The company said it uses a strain that does not produce citrinin. It has found puberulic acid in the recalled products and is looking into whether the substance might be linked to the fatalities. The suspect batch was manufactured in 2023. Some analysts have placed the blame on industry deregulation, intended to boost economic growth by facilitating the approval of health products. Benikoji products such as miso paste, crackers, food coloring, and a vinegar dressing made by other companies were also recalled. Kobayashi Pharmaceutical officially discontinued production of beni koji products on 8 August 2024.
A-DNA One of three main biologically active structural conformations of the DNA double helix, along with B-DNA and Z-DNA. The A-form helix has a right-handed twist with 11 base pairs per full turn, only slightly more compact than B-DNA, but its bases are sharply tilted with respect to the helical axis. It is often favored in dehydrated conditions and within sequences of consecutive purine nucleotides (e.g. GAAGGGGA); it is also the primary conformation adopted by double-stranded RNA and RNA-DNA hybrids.
Protein structural modeling can be performed by examining how well the amino acid substitutions fit into the core of the three-dimensional structure. Family (structural context) as used in the FSSP database (Families of structurally similar proteins) and the DALI/FSSP Web site, two structures that have a significant level of structural similarity but not necessarily significant sequence similarity. Fold similar to structural motif, includes a larger combination of secondary structural units in the same configuration. Thus, proteins sharing the same fold have the same combination of secondary structures that are connected by similar loops. An example is the Rossman fold comprising several alternating α helices and parallel β strands. In the SCOP, CATH, and FSSP databases, the known protein structures have been classified into hierarchical levels of structural complexity with the fold as a basic level of classification. Homologous domain (sequence context) an extended sequence pattern, generally found by sequence alignment methods, that indicates a common evolutionary origin among the aligned sequences. A homology domain is generally longer than motifs. The domain may include all of a given protein sequence or only a portion of the sequence. Some domains are complex and made up of several smaller homology domains that became joined to form a larger one during evolution. A domain that covers an entire sequence is called the homeomorphic domain by PIR (Protein Information Resource).
Electricity was originally understood to be a kind of fluid. This hydraulic analogy is still conceptually useful for understanding circuits. This analogy is also used to study the frequency response of fluid-mechanical networks using circuit tools, in which case the fluid network is termed a hydraulic circuit. Poiseuille's law corresponds to Ohm's law for electrical circuits, V = IR. Since the net force acting on the fluid is equal to ΔF = SΔp, where S = πr2, i.e. ΔF = πr2 ΔP, then from Poiseuille's law, it follows that
Sources: en.wikipedia.org
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.
Yes, endogenous synthesis occurs mainly in the liver, kidney, and pancreas. Meat and fish also contribute creatine to the diet.
Other forms contain creatine paired with different counterions or lacking water, so their mass and solubility differ. After dissolution, creatine itself is the shared active molecule.
Yes, especially when exposed to moisture or heat, where it converts to creatinine. In dry, sealed containers at room temperature, degradation is slow and the product may remain within specification for two to three years.