This is a working overview of Pharmacopeial monograph, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-04-16. Anything still debated is marked as such rather than presented as settled.
Quality control for creatine monohydrate begins with identity confirmation and assay determination. Laboratories commonly use high-performance liquid chromatography with ultraviolet detection, often after derivatization or using a suitable column, to quantify creatine. Karl Fischer titration measures water content, which helps verify the monohydrate stoichiometry. Additional tests screen for heavy metals, residual solvents, and microbial contamination depending on the intended use. These tests establish composition and purity rather than biological effect.
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.
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 |
|---|---|---|
| Common synonyms | Creatine hydrate; N-carbamimidoyl-N-methylglycine monohydrate | Synonyms vary by naming convention |
| Typical assay method | HPLC-UV | Often paired with a reference standard |
| Water content method | Karl Fischer titration | Confirms monohydrate stoichiometry |
| Degradation product | Creatinine | Forms more readily in solution and with heat |
| Typical storage temperature | 15–25 °C | Keep dry and away from direct sunlight |
The term creatine monohydrate is often shortened to creatine in casual usage, though other creatine forms exist, including citrate, nitrate, and hydrochloride salts. These alternative forms differ in solubility, pH behavior, and the amount of creatine delivered per unit mass. Regulatory categories vary by country: some jurisdictions treat it as a food ingredient, while others place it under supplement or drug frameworks depending on claims and presentation. Standard reference texts list it as a naturally occurring nitrogenous organic acid rather than a vitamin or mineral.
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.
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.
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.
== Biological function == Prolyl hydroxylase catalyzes the formation of hydroxyproline. The modification has a significant impact on the stability of collagen, the major connective tissue of the human body. Specifically, hydroxylation increases the melting temperature (Tm) of helical collagen by 16 °C, as compared to unhydroxylated collagen, a difference that allows the protein to be stable at body temperature. Due to the abundance of collagen (about one third of total protein) in humans, and the high occurrence of this modification in collagen, hydroxyproline is quantitatively the most abundant post-translational modification in humans. The enzyme acts specifically on proline contained within the X-Pro-Gly motif – where Pro is proline. Because of this motif-specific behavior, the enzyme also acts on other proteins that contain this same sequence. Such proteins include C1q, elastins, PrP, Argonaute 2, and conotoxins, among others.
Alfred Stracher (1931-2013) was an American biochemist and the founder and editor-in-chief of Drug Delivery. During his lifetime, he was Distinguished Professor of Biochemistry at SUNY Downstate Medical Center. Alfred Stracher was born in Albany, New York in 1931. He graduated from Rensselaer Polytechnic Institute in 1952 with a Bachelor of Science in Chemistry. He received his PhD in Chemistry from Columbia University in 1956.
Selenium has six natural isotopes that occur in significant quantities, along with the trace isotope 79Se, which occurs in minute quantities in uranium ores. Five of these isotopes are stable: 74Se, 76Se, 77Se, 78Se, and 80Se. The last three also occur as fission products, along with 79Se, which has a half-life about 330,000 years, and 82Se, which has the very long half-life of 8.76×1019 years as it decays via double beta decay to krypton-82 and for practical purposes can be considered to be stable. There are 23 other unstable isotopes that have been characterized, the longest-lived after 79Se being 75Se with its half-life 119.78 days, 72Se at 8.40 days, and 73Se at 7.15 hours. The others are all under an hour and most do not exceed 38 seconds.
An Iranian frigate, IRIS Dena, was sunk in the Indian Ocean by United States Navy submarine USS Charlotte, about 40 nautical miles (74 km; 46 mi) south of Galle, Sri Lanka. The vessel was returning to Iran following its participation in the International Fleet Review 2026 and the multilateral Exercise MILAN at Visakhapatnam, India. The exercise required ships not to carry ammunition, and the US likely knew the Dena was defenseless, since it sent a maritime patrol aircraft to participate. It was the first ship sunk by a submarine in active combat since the Falklands War, and the first by an American submarine since World War II. 104 Iranians were killed. The government of Azerbaijan said on 5 March that drones from Iran struck Azerbaijan's Nakhchivan exclave damaging an airport and injuring two civilians. Keir Starmer confirmed UK's bases on Cyprus would be used to defend the airspace of Jordan from Iranian drones, while Italy, the Netherlands and Spain confirmed they would send warships to defend Cyprus. Ireland stated it was willing to protect Cyprus and join the European defense coalition mobilized around the island if requested. The IDF killed Hamas official Wassim Attallah al-Ali in Beddawi, Lebanon. Trump said on 6 March that there were "no time limits" for how long the war could continue. The Iranian tanker IRIS Bushehr was interned by the Sri Lanka Navy, marking the first instance of a warship being interned in a neutral country since World War II.
Sources: en.wikipedia.org
In 1964, the first franchise was purchased by former police officer Kermit Bekke. This location, located at 1654 West Carson Street in Torrance, California, had its grand opening on May 28, 1965. Bekke sold his franchise a year and a half later. This location closed in 1975 when it moved across the street to store #1130 at 1619 West Carson Street, which itself would close in the late 1990s and subsequently be repurposed. On January 20, 1967, the 100th Taco Bell grand opening took place in Anaheim, located at 400 South Brookhurst (store #63); this location would later be replaced by a new location at 324 South Brookhurst in 1993. The first Taco Bell restaurant east of the Mississippi River (the 270th to open, store #258) opened at 2050 East Main Street in Springfield, Ohio, on September 20, 1968. Original Taco Bells featured only walk-up window service without indoor seating or drive-thru service. Inside seating was added sporadically in 1968 and drive-thru service was not generally available until 1980. As of 2025, seven original mission-style operating Taco Bell restaurants still remain, located in California and Colorado. A mission-style location (opened in April 1976) that operated in Honolulu, Hawaii (store #1281) remodeled in 2024, and another Mission-style location in Scottsdale, Arizona (store #31, opened circa July 3, 1966) closed on April 12, 2025.
== Contraindications == This drug is contraindicated in people with cancers that secrete catecholamines (for example epinephrine), such as pheochromocytoma or paraganglioma, because as a COMT inhibitor it blocks catecholamine degradation. Other contraindications are a history of neuroleptic malignant syndrome (NMS) or non-traumatic rhabdomyolysis, and combination with monoamine oxidase inhibitors that are not used as antiparkinsonians, because of possible drug interactions. NMS and associated rhabdomyolysis have been rarely observed under the older COMT inhibitors tolcapone and entacapone. This typically occurs shortly after the beginning of a COMT inhibitor add-on therapy when the levodopa dose has been reduced, or after discontinuation of a COMT inhibitor. Opicapone is contraindicated in people with concomitant use of non-selective monoamine oxidase (MAO) inhibitors or people with pheochromocytoma, paraganglioma, or other catecholamine secreting neoplasms.
which makes radium, the heaviest alkaline earth element, well suited for constraining new physics beyond the standard model. Some radium isotopes, such as radium-225, have octupole deformed parity doublets that enhance sensitivity to charge parity violating new physics by two to three orders of magnitude compared to 199Hg. Radium is also a promising candidate for trapped ion optical clocks. The radium ion has two subhertz-linewidth transitions from the
Certain serotonergic psychedelics and related non-hallucinogenic drugs, acting as serotonin 5-HT2A receptor agonists, have been reported to have mild stimulant and/or "psychic energizing" (i.e., acute antidepressant) effects, both in animals and humans. These effects are often present at low or sub-hallucinogenic doses. Psychedelics are also known to promote wakefulness or cause insomnia. Psychedelic and related drugs that have been reported to produce stimulant effects include the phenethylamines 2,5-DMA (DOH), DOM, DOET, DOPR, DON, MTFEM, Ariadne (4C-DOM; BL-3912; Dimoxamine), 2C-B, 2C-D, 2C-G-N, and ASR-2001 (2CB-5PrO), and the tryptamines 5-MeO-DiPT and 5-MeO-MiPT, among others. The lysergamide LSD has also been reported to have mild stimulant effects. Conversely, psilocybin does not seem to produce the same stimulant effects. The non-hallucinogenic Ariadne was under development as a potential pharmaceutical drug to take advantage of such effects in the treatment of conditions like depression in the 1970s, and reached phase 3 clinical trials for such indications, but was shelved reportedly for strategic economic reasons. ASR-2001, which is likewise non-hallucinogenic, is under development for use as a stimulant-like medication for treatment of psychiatric disorders. Serotonin 5-HT2A receptor agonists have been found to increase dopamine levels in brain areas like the frontal cortex, striatum, and nucleus accumbens in animal studies.
=== Pesticide === Nicotine has been used as an insecticide since at least 1690, in the form of tobacco extracts or as pure nicotine sulfate (although other components of tobacco also seem to have pesticide effects). It acts on the nicotinic acetylcholine receptor, and gave the receptor its name. Nicotine is in IRAC group 4B. Between 1915 and 1992, nicotine sulfate was available for purchase a home insecticide in the United States under the trade name "Black Leaf 40". Nicotine insecticides have been banned in the US since 2014, including use on organic crops, and is not recommended for small gardeners. Nicotine pesticides have been banned in the EU since 2009. Foods are imported from countries in which nicotine pesticides are allowed, such as China, but foods may not exceed maximum nicotine levels.
Sources: en.wikipedia.org
Karl Fischer titration is a standard method for measuring water content in solid and liquid samples. The result helps confirm the expected monohydrate stoichiometry. Loss-on-drying can also indicate moisture but may not distinguish water from other volatile substances.
Creatinine forms through irreversible cyclization and loss of water from creatine, and the rate increases with temperature, moisture, and pH changes. In dry solid form, the reaction is slow. In solution, degradation can become noticeable over time.
A specification typically lists assay range, water content, appearance, identification, and limits for heavy metals, residual solvents, and microbial counts. It may also include particle size distribution or bulk density for handling purposes. These parameters are distinct from any claimed performance effect.
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.