If you have been reading about dietary supplement 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 2026-07-15. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Storage recommendations generally emphasize a cool, dry place away from direct sunlight and strong oxidizers. Sealed containers limit humidity exchange, which helps prevent clumping and gradual conversion to creatinine. Long-term stability studies usually monitor appearance, moisture, and purity at intervals under defined temperature and humidity conditions. Accelerated tests at elevated temperature can reveal degradation pathways, but they do not perfectly predict room-temperature shelf life. Questions remain about how much creatinine formation is acceptable in different product categories and how packaging choices affect that rate over time.
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.
| 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 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.
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.
Identity and purity are assessed with several complementary methods. High-performance liquid chromatography can separate creatine from creatinine and related impurities, often with ultraviolet detection. Nuclear magnetic resonance and infrared spectroscopy provide structural confirmation, while Karl Fischer titration measures water content. Elemental analysis and mass spectrometry may be used for additional confirmation, especially in research or forensic settings. No single method captures every quality attribute, so laboratories typically combine results and compare them against a specification.
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.
Iran dismisses a peace plan proposed by the U.S., calling the demands "excessive". The White House warns Iran that Donald Trump will "ensure they are hit harder than ever before" if the country refuses to accept defeat. The U.S. Supreme Court unanimously holds that internet service providers are not liable for the copyright infringement of their users if the ISP did not intend its services to be used for infringement. Trump signs an executive order requiring proof of U.S. citizenship for voter registration.
Neutrino experiments include ICARUS and MicroBooNE, both of which use high-purity liquid argon in a time projection chamber for fine grained three-dimensional imaging of neutrino interactions. At Linköping University, Sweden, the inert gas is being utilized in a vacuum chamber in which plasma is introduced to ionize metallic films. This process results in a film usable for manufacturing computer processors. The new process would eliminate the need for chemical baths and use of expensive, dangerous and rare materials.
==== Childhood ==== Thomas wrote a number of accounts of his childhood growing up in Swansea, and there are also accounts available by those who knew him as a young child. Thomas wrote several poems about his childhood and early teenage years, including "Once it was the colour of saying" and "The hunchback in the park", as well as short stories such as The Fight and A Child's Christmas in Wales. Thomas's four grandparents played no part in his childhood. For the first ten years or so of his life, Thomas's Swansea aunts and uncles helped with his upbringing. These were his mother's three siblings, Polly and Bob, who lived in the St Thomas district of Swansea and Theodosia, and her husband, the Rev. David Rees, in Newton, Swansea, where parishioners recall Thomas sometimes staying for a month or so at a time. All four aunts and uncles spoke Welsh and English. Thomas's childhood also featured regular summer trips to the Llansteffan peninsula, a Welsh-speaking part of Carmarthenshire. In the land between Llangain and Llansteffan, his mother's family, the Williamses and their close relatives, worked a dozen farms with over a thousand acres between them. The memory of Fernhill, a dilapidated 15-acre farm rented by his maternal aunt, Ann Jones, and her husband, Jim Jones, is evoked in the 1945 lyrical poem "Fern Hill", but is portrayed more accurately in his short story, The Peaches.
Focke-Wulf A 3 Focke-Wulf A 4 Focke-Wulf A 5 Focke-Wulf A 6 Focke-Wulf A 7 Focke-Wulf A 16 – light transport aircraft, 1924. First design built by Focke-Wulf. Focke-Wulf A 17 Möwe (Gull) – 8-passenger airliner, 1927. Focke-Wulf A 20 Habicht (Hawk) – 4-passenger feederliner, 1927. Focke-Wulf A 21 Photomöwe – aerial photography version of A 17, 1929. Focke-Wulf A 26 – engine testbed Focke-Wulf A 28 – A 20 with Bristol Titan engine Focke-Wulf A 29 – production version of A 17, 1929. Focke-Wulf A 32 Bussard (Buzzard) – airliner, 1930. Focke-Wulf A 33 Sperber (Sparrowhawk) – 3-passenger airliner, 1930. Focke-Wulf A 36 Mastgans (Mast Goose) – mail plane, 1931. Focke-Wulf A 38 Möwe (Gull) – 10-passenger airliner, 1931. Focke-Wulf F 19 Ente (Duck) – experimental civil utility aircraft, 1927. Focke-Wulf GL 18 – light transport aircraft developed from the A 16, 1926. Focke-Wulf GL 22 – revised GL 18, 1927. Focke-Wulf K 23 Buchfink (Chaffinch) – two-seat reconnaissance aircraft, 1928. Focke-Wulf AL 101 D Albatros Focke-Wulf S 1 – trainer, 1925. Focke-Wulf S 2 – two-seat trainer, 1928. Focke-Wulf S 24 Kiebitz (Lapwing) – two-seat sports biplane, 1928. Focke-Wulf S 39 – two-seat reconnaissance parasol monoplane, 1931-1932. Focke-Wulf W 4 – reconnaissance floatplane, 1927. Focke-Wulf W 7 – maritime patrol biplane, 1932.
=== Magnetic === In 2015 researchers announced a graphene-based magnetic sensor 100 times more sensitive than an equivalent device based on silicon (7,000 volts per amp-tesla). The sensor substrate was hexagonal boron nitride. The sensors were based on the Hall effect, in which a magnetic field induces a Lorentz force on moving electric charge carriers, leading to deflection and a measurable Hall voltage. In the worst case graphene roughly matched a best case silicon design. In the best case graphene required lower source current and power requirements.
Sources: en.wikipedia.org
==== Post-war German culture ==== At the same time Adorno struck up relationships with contemporary German-language poets such as Paul Celan and Ingeborg Bachmann. Adorno's 1949 dictum—" To write poetry after Auschwitz is barbaric"—posed the question of what German culture could mean after Auschwitz; his own continual revision of this dictum—in Negative Dialectics, for example, he wrote that "Perennial suffering has as much right to expression as a tortured man has to scream"; while in "Commitment," he wrote in 1962 that the dictum "expresses in negative form the impulse which inspires committed literature"—was part of post-war Germany's struggle with history and culture. Adorno additionally befriended the writer and poet Hans Magnus Enzensberger as well as the film-maker Alexander Kluge. In 1963, Adorno was elected to the post of chairman of the German Sociological Society, where he presided over two important conferences: in 1964, on "Max Weber and Sociology" and in 1968, on "Late Capitalism or Industrial Society." A debate launched in 1961 by Adorno and Karl Popper, later published as the Positivist Dispute in German Sociology, arose out of disagreements at the 1959 14th German Sociology Conference in Berlin. Adorno's critique of the dominant climate of post-war Germany was also directed against the pathos that had grown up around Heideggerianism, as practiced by writers like Karl Jaspers and Otto Friedrich Bollnow, and which had subsequently seeped into public discourse.
Other adverse events included spinal epidural hematoma (in the cervical, thoracic and lumbar spine), chylothorax, injuries of abdominal organs and tissues, injuries in the neck region, injuries to the eyes, including orbital hemorrhage, traumatic cataract, injury of the oculomotor nerve and retinal puncture, hemorrhage to the cheeks and the hypoglottis, peripheral motor-nerve injuries and subsequent motor dysfunction, local allergic reactions to metal needles, stroke, and cerebral hemorrhage after acupuncture. A causal link between acupuncture and the adverse events cardiac arrest, pyknolepsy, shock, fever, cough, thirst, aphonia, leg numbness, and sexual dysfunction remains uncertain. The same review concluded that acupuncture can be considered inherently safe when practiced by properly trained practitioners, but the review also stated there is a need to find effective strategies to minimize the health risks. Between 1999 and 2010, the Korean-language literature contained reports of 1104 adverse events. Between the 1980s and 2002, the Japanese-language literature contained reports of 150 adverse events.
=== In humans === In 2004, a German boy was diagnosed with a mutation in both copies of the myostatin-producing gene, making him considerably stronger than his peers. His mother has a mutation in one copy of the gene. An American boy born in 2005 was diagnosed with a clinically similar condition, but with a somewhat different cause: his body produces a normal level of functional myostatin, but because he is stronger and more muscular than most others his age, a defect in his myostatin receptors is thought to prevent his muscle cells from responding normally to myostatin. He appeared on the television show World's Strongest Toddler.
===== Epidermis ===== The entire surface of the plant consists of a single layer of cells called epidermis or surface tissue. The entire surface of the plant has this outer layer of the epidermis. Hence, it is also called surface tissue. Most of the epidermal cells are relatively flat. The outer and lateral walls of the cell are often thicker than the inner walls. The cells form a continuous sheet without intercellular spaces. It protects all parts of the plant. The outer epidermis is coated with a waxy thick layer called Cutin, which prevents loss of water. The epidermis also consists of stomata (singular:stoma), which helps in transpiration.
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.
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.