The short version of Reference standard fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-12-22. Anything still debated is marked as such rather than presented as settled.
Cardarine is explicitly prohibited by the World Anti-Doping Agency under the class of PPARδ agonists. Its presence in urine or blood samples can be detected using mass spectrometry-based methods, often liquid chromatography-tandem mass spectrometry. Athletes who test positive may face sanctions, including bans from competition. The compound is also regulated as a prescription-only or unapproved drug in many countries. Enforcement varies by jurisdiction, and some regions treat it as a controlled substance. Online sales may occur despite these restrictions, creating quality and legal risks.
Laboratory detection of cardarine typically involves sample preparation followed by chromatographic separation and mass spectrometric identification. Urine is the most common matrix for anti-doping tests, though blood and hair have also been explored. Methods can target the parent compound or its metabolites, depending on the expected window of detection. Reference standards are required for accurate quantification. Matrix effects and dilution can influence results, so laboratories use internal standards and validation protocols. The exact detection window varies with dose, route, and individual metabolism.
Laboratory detection of GW501516 commonly uses liquid chromatography coupled with tandem mass spectrometry. The method can identify the parent compound or its metabolites in urine and blood after sample cleanup. Protein precipitation, solid-phase extraction, or enzymatic hydrolysis may precede analysis, depending on the matrix. Reference standards are required for accurate quantification and confirmation. Because the compound is not approved, testing often occurs in anti-doping, forensic, or research settings rather than routine clinical care. Results are reported with limits of detection and quantification.
Stability of GW501516 depends on form, temperature, light exposure, and moisture. Solid reference material is typically stored frozen or refrigerated in a desiccator and protected from light. Solutions in organic solvents such as dimethyl sulfoxide are often kept frozen in aliquots to reduce freeze-thaw cycling. Aqueous solubility is low, so aqueous stock solutions can be difficult to prepare without cosolvents. Degradation may appear as changes in chromatographic purity or mass spectral signal. Stability studies are needed to establish shelf life for any specific preparation.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a PPARδ agonist. |
| Typical detection matrix | Urine | Most common sample for anti-doping analysis. |
| Common analytical method | LC-MS/MS | Liquid chromatography-tandem mass spectrometry. |
| Common synonyms | GW501516, GSK-516, endurobol | Names found in research and fitness contexts. |
| Typical detection window | Variable | Depends on dose, route, and individual metabolism. |
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
Clinical development stopped after rodent studies showed tumors at multiple sites. Whether those findings predict human cancer risk remains an open question, but they led sponsors to discontinue programs. Human safety data are limited to small, short-term studies that were not designed to assess cancer risk. Reported effects in those studies included changes in blood lipids, but the evidence is insufficient for medical use. Long-term consequences of nonmedical use are not well characterized. Questions about dose, duration, and individual susceptibility remain unresolved.
Cardarine is a common name for GW501516, an investigational compound developed in the 1990s for metabolic conditions. It acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in lipid and energy metabolism. The compound is frequently mislabeled as a selective androgen receptor modulator, or SARM, but its molecular target is different. GW501516 reached early clinical testing before development was discontinued. It has no approved therapeutic use in any country. The name cardarine is not a formal international nonproprietary name.
Regulatory treatment varies, but cardarine is not approved as a medicine. Sports authorities list GW501516 as a prohibited substance, and it is banned at all times under the World Anti-Doping Agency code. Many countries restrict sales for human consumption, while online vendors market it as a research chemical. Such products may lack purity data, and their actual contents can differ from the label. Purchasing or possessing cardarine may carry legal consequences depending on jurisdiction. The compound is not a dietary supplement ingredient in regulated markets.
== Gene expression == The CCND1 gene encodes the cyclin D1 protein. The human CCND1 gene is located on the long arm of chromosome 11 (band 11q13). It is 13,388 base pairs long, and translates into 295 amino acids. Cyclin D1 is expressed in all adult human tissues with the exception of cells derived from bone marrow stem cell lines (both lymphoid and myeloid).
Naltrexone and its active metabolite 6β-naltrexol are competitive antagonists of the opioid receptors. Naltrexone is specifically an antagonist preferentially of the μ-opioid receptor (MOR), to a lesser extent of the κ-opioid receptor (KOR), and to a much lesser extent of the δ-opioid receptor (DOR). However, naltrexone is not actually a silent antagonist of these receptors but instead acts as a weak partial agonist, with Emax values of 14 to 29% at the MOR, 16 to 39% at the KOR, and 14 to 25% at the DOR in different studies. In accordance with its partial agonism, although naltrexone is described as a pure opioid receptor antagonist, it has shown some evidence of weak opioid effects in clinical and preclinical studies. By itself, naltrexone acts as an antagonist or weak partial agonist of the opioid receptors. In combination with agonists of the MOR such as morphine however, naltrexone appears to become an inverse agonist of the MOR. Conversely, the naltrexone remains a neutral antagonist (or weak partial agonist) of the KOR and DOR. In contrast to naltrexone, 6β-naltrexol is purely a neutral antagonist of the opioid receptors. The MOR inverse agonism of naltrexone, when it is co-present with MOR agonists, may in part underlie its ability to precipitate withdrawal in opioid-dependent individuals. This may be due to suppression of basal MOR signaling via inverse agonism. Occupancy of the opioid receptors in the brain by naltrexone has been studied using positron emission tomography (PET).
=== April === 1 April – Former Conservative government minister Sir Alister Jack, who admitted placing three bets on the outcome of the 2024 United Kingdom general election, is to be appointed to the House of Lords. Stephen Flynn, the Scottish National Party's leader at Westminster, confirms his intention to stand for the party in the 2026 Holyrood election. 2 April – Patrick Harvie announces he is standing down as co-leader of the Scottish Greens, but will stay on until an election is held in the summer. 3 April – The Labour Party campaign for the local elections is launched in Derbyshire. 4 April – Jamie Greene, an MSP who left the Scottish Conservatives the previous day, joins the Scottish Liberal Democrats, blaming his decision to leave the Conservative on them becoming "Trump-esque in both style and substance" in an attempt to win the support of right-wing voters. He subsequently says there is "growing disquiet" among former colleagues about the party's direction. Stephen Hartley, a Reform UK candidate for the local elections to Oxfordshire County Council, is suspended from the party after it was revealed he had posted comments in support of child abuser Jimmy Savile on social media. 5 April – Labour suspends Dan Norris, the MP for North East Somerset and Hanham, following his arrest on suspicion of rape, child sex offences, child abduction and misconduct in a public office. 6 April – Labour MPs Abtisam Mohamed and Yuan Yang say they are "astounded" to have been refused entry to Israel while on a trip to visit the West Bank.
Sources: en.wikipedia.org
is able to account for the decrease in viscosity observed in some solutions. Estimated values of these constants are shown below for sodium chloride and potassium iodide at temperature 25 °C (mol = mole, L = liter).
Thomson (1937), Roman Catholic priest, professor at Providence College Thomas Merton (1938), Trappist monk, writer, humanist; author of The Seven Storey Mountain Robert Farrar Capon (1946), Episcopal priest and author Wesley Frensdorff (1948), former Episcopal bishop of Nevada Haskel Lookstein (1953), Modern Orthodox Rabbi; spiritual leader of Congregation Kehilath Jeshurun and principal of Ramaz School since 1966 Harold Kushner (1955), rabbi and writer Adi Da (1961), born Franklin Albert Jones, spiritual teacher; founder of a new religious movement, Adidam Michael Lerner (1964), liberal rabbi and editor of Tikkun magazine Elliot N. Dorff (1965), conservative rabbi, chairman of the Rabbinical Assembly's Committee on Jewish Law and Standards Joseph Goldstein (1965), vipassana expert Alan Senauke (1969), Soto Zen priest, folk musician, and poet residing at the Berkeley Zen Center; former director of the Buddhist Peace Fellowship Taigen Dan Leighton (1971), Soto Zen priest and teacher, academic at the Institute of Buddhist Studies C. John McCloskey (1975), Catholic priest who helped prominent figures convert to Catholicism, including Newt Gingrich, Bernard Nathanson, Sam Brownback, and Lawrence Kudlow Haviva Ner-David (1991), Israeli feminist activist and rabbi Sharon Brous (1995), first woman to be named most influential rabbi by Newsweek
== Method == A model resonance ionization mass spectrometry (RIMS) set-up consists of a laser system (consisting of multiple lasers), sample from which the atoms are derived, and a suitable mass spectrometer which mass-selectively detects the photo ions created from resonance. In resonant ionization, atoms or molecules from ground state are excited to higher energy states by the resonant absorption of photons to produce ions. These ions are then monitored by appropriate detectors. In order to ensure a highly-efficient sensitivity and process saturation, the atomic or molecular beam must be formed from the ground state, the atoms should be efficiently excited and ionized, and each atom should be converted by the photon field of a short-timed pulsed laser to produce a positive ion and a valence electron. In a basic RIS process, a pulsed laser beam produces photons of the right energy in order to excite an atom initially in its ground state, a, to an excited level, b. During the laser pulse, the ion population of state b increases at the expense of that of state a. After a few minutes, the rate of stimulated emission from the excited state will equal rate of production so that the system is in equilibrium as long as the laser intensity is kept sufficiently high during a pulse. This high laser intensity translates into a photon fluence (photons per unit of beam area) large enough so that a necessary condition for the saturation of the RIS process has been met.
=== Cardiovascular === Like other NSAIDs, its use is associated with an increased risk of cardiovascular events such as heart attack and stroke. Although meloxicam inhibits formation of thromboxane A, it does not appear to do so at levels that would interfere with platelet function. A pooled analysis of randomized, controlled studies of meloxicam therapy of up to 60 days duration found that meloxicam was associated with a statistically significantly lower number of thromboembolic complications than the NSAID diclofenac (0.2% versus 0.8% respectively) but a similar incidence of thromboembolic events to naproxen and piroxicam. People with hypertension, high cholesterol, or diabetes are at risk for cardiovascular side effects. People with family history of heart disease, heart attack, or stroke should tell their treating physician as the potential for serious cardiovascular side effects is significant.
Sources: en.wikipedia.org
=== Niche uses === Triethylamine is commonly used in the production of anionic polyurethane dispersions (resins dispersed in water rather than solvents) as a neutralizing agent. Triethylamine is used to give salts of various carboxylic acid-containing pesticides, e.g. Triclopyr and 2,4-dichlorophenoxyacetic acid. Triethylamine is the active ingredient in FlyNap, a product for anesthetizing fruit flies. It is also used in mosquito and vector control labs to anesthetize mosquitoes. This is done to preserve any viral material that might be present during species identification. The bicarbonate salt of triethylamine (often abbreviated TEAB, triethylammonium bicarbonate [(CH3CH2)3NH]+HCO−3) is useful in reverse phase chromatography, often in a gradient to purify nucleotides and other biomolecules. Triethylamine was discovered by the Germans during the early 1940s to be hypergolic in combination with nitric acid, and was used as a component in the German Wasserfall rocket. The Soviet Scud missile used TG-02, a mixture of 50% xylidine and 50% triethylamine as a starting fluid to ignite its rocket engine.
In the final stage of elongation, called translocation, the deacylated tRNA (in the P site) and the dipeptidyl-tRNA (in the A site) along with its corresponding codons move to the E and P sites, respectively, and a new codon moves into the A site. This process is catalyzed by elongation factor G (EF-G). The deacylated tRNA at the E site is released from the ribosome during the next A-site occupation by an aminoacyl-tRNA again facilitated by EF-Tu. The ribosome continues to translate the remaining codons on the mRNA as more aminoacyl-tRNA bind to the A site, until the ribosome reaches a stop codon on mRNA(UAA, UGA, or UAG). The translation machinery works relatively slowly compared to the enzyme systems that catalyze DNA replication. Proteins in bacteria are synthesized at a rate of only 18 amino acid residues per second, whereas bacterial replisomes synthesize DNA at a rate of 1000 nucleotides per second. This difference in rate reflects, in part, the difference between polymerizing four types of nucleotides to make nucleic acids and polymerizing 20 types of amino acids to make proteins. Testing and rejecting incorrect aminoacyl-tRNA molecules takes time and slows protein synthesis. In bacteria, translation initiation occurs as soon as the 5' end of an mRNA is synthesized, and translation and transcription are coupled. This is not possible in eukaryotes because transcription and translation are carried out in separate compartments of the cell (the nucleus and cytoplasm).
Professor at the University of Groningen. Rachel Mamlok-Naaman, Israeli chemist, specialized in chemistry education Corine Mathonière, French materials chemist studying molecular magnetism, spin crossover molecules, and coordination chemistry Catherine J. Murphy, American chemist Nga Lee (Sally) Ng, atmospheric chemist studying particulates and their effects on air quality, climate, and human health Sarah O'Connor, American plant synthetic biologist working in England Kimberly Prather, American atmospheric chemist whose research contributed to understanding of atmospheric aerosols and their impact on air quality, climate, and human health Gillian Reid, British inorganic chemist. President elect (2020-present) and present (2022-present) of the Royal Society of Chemistry. Professor at the University of Southampton. Sarah E Reisman, American organic chemist Magdalena Titirici, materials chemist focusing on sustainable materials for energy applications. Professor at Imperial College London. Claudia Turro, American inorganic chemist who studies light-initiated reactions of metal complexes with application to disease treatment and solar energy conversion. Seble Wagaw, American process chemist and pharma exec Marcey Lynn Waters, American chemical biologist and supramolecular chemist Jenny Y Yang, American chemist and clean energy researcher at UCI Wendy Young, American medicinal chemist and pharmaceutical executive. Chair of ACS Medicinal Chemistry Division (2017). Jaqueline Kiplinger, American chemist working at the Los Alamos National Laboratory
Examples of this style include Joris Ivens' Rain (1928), which records a passing summer shower over Amsterdam; László Moholy-Nagy's Play of Light: Black, White, Grey (1930), in which he films one of his own kinetic sculptures, emphasizing not the sculpture itself but the play of light around it; Oskar Fischinger's abstract animated films; Francis Thompson's N.Y., N.Y. (1957), a city symphony film; and Chris Marker's Sans Soleil (1982). Expository documentaries speak directly to the viewer, often through an authoritative commentary employing voiceover or titles, proposing a strong argument and point of view. These films are rhetorical and try to persuade the viewer. They may use a rich and sonorous male voice. The (voice-of-God) commentary often sounds "objective" and omniscient. Images are often not paramount; they exist to advance the argument. The rhetoric insistently presses upon us to read the images in a certain fashion. Historical documentaries in this mode deliver an unproblematic and "objective" account and interpretation of past events. Examples: TV shows and films like Biography, America's Most Wanted, many science and nature documentaries, Ken Burns' The Civil War (1990), Robert Hughes' The Shock of the New (1980), John Berger's Ways of Seeing (1972), Frank Capra's wartime Why We Fight series, and Pare Lorentz's The Plow That Broke the Plains (1936).
== Historical recipes == Gochujang ingredients reported in Jeungbo sallim gyeongje were 18 litres (19 US quarts) of powdered and sieved meju (fermented soybeans), 540 mL (18+1⁄2 US fl oz) of chili powder, and 1.8 L (1+7⁄8 U.S. qt) of glutinous rice flour, as well as soup soy sauce for adjusting the consistency. The gochujang recipe in Gyuhap chongseo, an 1809 cookbook, uses powdered meju made from 18 L (19 US qt) of soybeans and 3.6 L (3+3⁄4 US qt) of glutinous rice, then adding 900–1,260 mL (30+1⁄2–42+1⁄2 US fl oz) of chili powder and bap made from 3.6 L (3.8 US qt) of glutinous rice.
Sources: en.wikipedia.org
Yes, WADA prohibits cardarine as a PPARδ agonist. It appears on the prohibited list and can be detected in urine or blood. Athletes using it risk sanctions.
Detection usually uses liquid chromatography-tandem mass spectrometry after sample cleanup. Laboratories look for the parent compound or metabolites. The method requires validated reference standards and controls.
Legality varies by country. In many places it is an unapproved drug and cannot be legally sold for human consumption. Purchasing from online vendors carries legal and quality risks.
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.