This is a working overview of GW501516, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-10-06 and is reviewed periodically as new material appears.
Products sold as cardarine have been found to contain incorrect compounds, variable amounts, or no active ingredient at all. Independent testing is required to verify identity and purity. Common analytical approaches include high-performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance for structural confirmation. These methods can distinguish GW501516 from related PPAR agonists and from unrelated steroids. For regulators and researchers, such verification is central to interpreting both biological results and adverse event reports.
Cardarine is prohibited in competitive sport under the World Anti-Doping Agency code, where it is classified as a metabolic modulator. It is not approved as a prescription medicine in the United States, European Union, or other major markets. Regulatory action has focused on its presence in sports and in products marketed as research chemicals. Because it has no accepted medical indication, supply is often unregulated. This status creates legal and safety uncertainties for anyone who encounters the substance.
GW501516 acts on PPARδ, a nuclear receptor that helps regulate fatty acid oxidation and energy homeostasis. In animal studies, activation of this receptor was associated with increased endurance and changes in lipid metabolism. Human trials examined effects on blood lipids and other metabolic markers, but the compound did not advance to approval. Rodent studies later reported tumors in multiple tissues at doses used in those experiments. Whether those findings translate to human risk remains uncertain, and the clinical relevance of the animal data is still debated.
Regulatory bodies treat GW501516 as a prohibited substance in competitive sport. The World Anti-Doping Agency added it to the prohibited list, and it falls under classes covering metabolic modulators and hormone-related agents. It is not approved by drug regulators for human use, and it is not a lawful dietary supplement. Products sold under the cardarine name may contain unlisted ingredients or different compounds. Because no approved product exists, quality and identity are not guaranteed by pharmaceutical manufacturing standards.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a metabolic modulator. |
| Approved medical use | None in major jurisdictions | Not a registered drug. |
| Common test matrix | Urine | Most anti-doping samples use urine. |
| Typical detection method | LC-MS/MS | Detects parent compound and metabolites. |
| Reference standard storage | -20 °C, desiccated | Typical for analytical standards. |
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
Cardarine is frequently described as a fat-burning or endurance-enhancing supplement, but these claims exceed the available evidence. The compound is not a hormone, steroid, or selective androgen receptor modulator. Research articles discuss it as a tool compound for studying PPARδ biology, while anti-doping literature focuses on its abuse and detection. Quality of unapproved products is uncertain, and independent analyses have found impurities or incorrect labeling. Open questions include whether human cancer risk resembles that seen in rodents and how often non-athletes use the substance.
Cardarine has no approved therapeutic indication and is not marketed as a medicine. The World Anti-Doping Agency lists GW501516 as a prohibited substance at all times, covering both in-competition and out-of-competition periods. National laws vary: some countries treat it as an unapproved drug subject to import controls, while others have specific restrictions on sale for human consumption. It is often sold as a research chemical, a label that does not imply safety or legality. Enforcement actions have targeted online vendors and shipments.
Published studies have examined GW501516 in animal models of obesity, insulin resistance, and exercise endurance. Early human trials reportedly ended, and development was discontinued after preclinical findings raised concerns about cancer in some rodent studies. Regulatory agencies have not approved cardarine for any medical use. Its availability through non-pharmaceutical channels raises questions about identity, purity, and legal status that are separate from its laboratory pharmacology. Those questions are often addressed through analytical testing rather than assumptions about product labels.
Cardarine is a common name for GW501516, also GW-1516, a synthetic compound developed as a peroxisome proliferator-activated receptor delta (PPARδ) agonist. It belongs to a class of agents that modulate gene transcription related to lipid and energy metabolism. The compound was studied in preclinical and early clinical research for metabolic and cardiovascular conditions, but it did not progress to approved therapeutic use. Its name appears in fitness and sports contexts despite not being approved as a drug.
PPARδ is a nuclear receptor that influences transcription of genes involved in fatty acid oxidation, lipid transport, and energy homeostasis. GW501516 binds and activates this receptor with high selectivity relative to PPARα and PPARγ in laboratory assays. Activation alters expression of target genes in skeletal muscle, liver, and adipose tissue in animal models. The exact clinical consequences of these changes in humans remain incompletely characterized, and observed effects in animals do not establish therapeutic benefit or safety.
=== Distribution === Following absorption, 2,6-DCBQ distributes predominantly to highly perfused organs, such as the liver and the kidneys. Its moderate lipophilicity facilitates the crossing of cellular membranes. The quinone structure allows for redox cycling between quinone and hydroquinone within tissues. This process can lead to the formation of reactive oxygen species (ROS), contributing to intracellular oxidative stress. Due to its high reactivity and its metabolic transformation, 2,6-DCBQ does not significantly accumulate in adipose tissue.
γ-Amino-β-hydroxybutyric acid (GABOB), also known as β-hydroxy-γ-aminobutyric acid (β-hydroxy-GABA), sold under the brand name Gamibetal among others, is an anticonvulsant which is used for the treatment of epilepsy in Europe, Japan, and Mexico. It is a GABA analogue, or an analogue of the neurotransmitter γ-aminobutyric acid (GABA), and has been found to be an endogenous metabolite of GABA.
==== Riots ==== Heseltine became the troubleshooter to deal with the explosion of violence in Britain's inner cities in the aftermath of the Brixton and Toxteth riots of 1981. Unemployment had reached 20% in Liverpool as a whole, but 60% among young black residents in Toxteth. Tear gas had had to be used, and the Cabinet contemplated deploying the Army. A few weeks before the riots, a Cabinet thinktank had proposed that the area be left to go into "managed decline". Thatcher visited Merseyside and it was decided that a minister should go for a longer visit. Heseltine was already chairman of the Merseyside Partnership, set up by his predecessor Peter Shore, to channel government money into Liverpool (six other partnerships existed). Heseltine visited Liverpool accompanied by a dozen or so officials from different ministries. Timothy Raison, a junior Home Office minister, went ostensibly to check on race matters but actually to ensure that Heseltine did not interfere in police matters. Heseltine visited council estates, often accompanied by gangs of grinning children trying to be noticed on television, and his flamboyance as a self-made man went down surprisingly well in a City famous for turning out flamboyant figures in the entertainment industry. He talked to black community leaders, who complained about police bias and brutality, and he later had an awkward private meeting with the Chief constable Kenneth Oxford about the matter.
Dimerization of two monomeric receptor kinases or stabilization of a loose dimer. Many ligands of receptor tyrosine kinases are multivalent. Some tyrosine receptor kinases (e.g., the platelet-derived growth factor receptor) can form heterodimers with other similar but not identical kinases of the same subfamily, allowing a highly varied response to the extracellular signal. Trans-autophosphorylation (phosphorylation by the other kinase in the dimer) of the kinase. Autophosphorylation stabilizes the active conformation of the kinase domain. When several amino acids suitable for phosphorylation are present in the kinase domain (e.g., the insulin-like growth factor receptor), the activity of the kinase can increase with the number of phosphorylated amino acids; in this case, the first phosphorylation switches the kinase from "off" to "standby".
Sources: en.wikipedia.org
Directed by Sheila Hayman, made by Uden Associates 8 November Rebuilding Berlin, how German telecommunication and electrical engineers found great difficulty in connecting the infrastructure and technology of East and West Berlin, which were largely totally incompatible, and why the two technological systems were so different; East and West Germany were founded in 1953; the trains in East (Deutsche Reichsbahn or DR) and West Germany ran on electric motors that worked in opposite ways; Erich Kratky of Berliner Verkehrsbetriebe (former West Berlin Public Transport) and how East Berlin drivers had 60% of those in West Berlin; Mahlow station, on the S2 line on the Berlin S-Bahn, was completely rebuilt in 1991, opening on 31 August 1992; before 1989, West Berlin could not connect to any neighbouring electrical power networks, so had to make all of its own power itself, by nine power stations; in 1992 West Berlin could not make enough electrical power;Jürgen Beyer of the East Berlin Electricity Board; in 1992 East and West Germany could not connect their electricity systems together; Klaus Krämer of the West Berlin Electricity Board, and how East German load frequency control (LFC) was not good enough for West Germany; East German power stations were polluting; Müggelsee in East Berlin; East Berlin had natural gas - from Russia - but West Berlin did not have natural gas, and had to produce its own gas from processing, and there were many more gas leaks in East Berlin, run by the Berlin Gas Board, and British Gas plc was installing most of the new plastic gas mains in East Berlin; one fifth of housing in East Berlin was uninhabitable, due to lack of renovation and unsafe electrical wiring; much housing in East Berlin did not have any bathrooms; the post system in East Berlin was three times slower than West Berlin, as it was all sorted by hand, and mail hand to be sent in standard envelopes only, in East Germany - the two post systems were incompatible, and East and West Germany had totally different postcode systems, although both had four digits, so a letter was put in front of each Deutsche Post postcode, to show if it was an East or West German postcode; in 1952, telephone connections between East and West Germany were stopped, but four lines were installed in 1972; the East German telephone exchanges were all mechanical, and could not transmit any digital communications; one in ten people in East Berlin had a phone - telecommunications in East Berlin were hopeless and expensive; in 1992 Deutsche Telekom connected East and West Berlin, and the price would be a local call, not the price of an international call, under the phrase Wir schaffen Verbingdungen; not only were East German telecommunications often impossible, but the Stasi secret police were listening in to most calls; Rudolf Reichel of the former East German Economic Institute; science research in East Germany had been greatly restricted; Volker Hassemer; East Germans viewed West Germans as selfish, and West Germans viewed East Germans as backward. Narrated by Su-Lin Looi, directed by Cosima Dannoritzer, produced by Karl Sabbagh, made by Skyscraper Productions 15 November 21st Century Jet, how the Boeing 777 moved from the drawing board to manufacture in 1992, with the innovative new method called CATIA; the Boeing 777 was the largest jet aircraft to have been developed mostly by computer, with assembly beginning in January 1993; there were 10,000 people in the 777 programme, who met the managers in a weekly meeting; meeting the needs of Robert Crandall of American Airlines, and competition from the new Airbus A340; parts of the tail were built in Australia; the nose cone and flaps were made in Italy; the landing gear was made in Canada, the US, and France; parts of the wing ribs and passenger doors were made in Japan; the nose landing gear door was made in Belfast; some of the electronics was made in England; there were about 230 design teams, from different manufacturers; the CATIA system was a digital mockup; Thomas Gaffney, head of passenger doors; Henry Shomber, one of the chief engineers; John Roundhill, a chief project engineer; United Airlines placed the first order, which started the project; Al Tyler of Aerospace Technologies of Australia (ASTA), who made the 777 rudder - the company became Boeing Australia; John King, Baron King of Wartnaby of British Airways visits to look at legroom for the new 777. Narrated by Simon Prebble, directed by Karl Sabbagh, made by Skyscraper Productions 22 November The Puzzle of HIV, scientists after ten years did not understand how HIV worked; immunologists Anthony Fauci and Max Essex; Angus Dalgleish of St George's, University of London; virologist Stephen S. Morse, and the origination of viruses, and how most pandemics originated in China; Stella Knight of the MRC, and dendritic cells, researched by Brigid Balfour; French immunologist Jean-Claude Ameisen of the Pasteur Institute of Lille; virologist Jonas Salk; Claude Nicolau, and the CD4 glycoprotein. Narrated by Scottish actress Sandra Clark, directed by Nigel Maslin, produced by Chris Haws, made by InCA Productions 29 November The Alpha Link, much of medical understanding of radiation protection and health comes from what occurred in Japan in August 1945. Martin Gardner (1940–93), an epidemiologist, and Professor of Medical Statistics at the University of Southampton, thought that health was affected by working in a nuclear power station, which the British nuclear industry vehemently would not believe. Directed by Vivienne King, made by Box Productions 6 December Toying with the Future, about electronic children's toys, visiting Ocean Software in Manchester; Brian Sutton-Smith of the University of Pennsylvania, and how toys were small replicas of large world events; Eugene F. Provenzo of the University of Miami and how the culture of childhood began in the early 1700s, and how German Friedrich Fröbel developed educational toys in the early 1800s, but it often lacked fun; Meccano Ltd sets, developed by Frank Hornby, launching the international Meccano Guild network of children's mechanical clubs in 1919, publicised by the Meccano Magazine; Richard Gregory, neuropsychologist at the University of Bristol, and his Exploratory Hands-on Science Centre, which closed in 1999, replaced by We the Curious in 2000; toy designer Patrick Rylands; Gary Bracey of Ocean Software; Keith Tinman, computer game musician; Elizabeth Curran of GameTek; Ocean Software designers Ray Coffey, James Higgins and Dawn Drake. Directed by Christopher Rawlence, produced by Debra Hauer, made by Rawlence Hauer Productions 13 December The Elements, a repeat of the 20 October 1991 episode 20 December E.T. Please Phone Earth, about the SETI Institute, with Prof Philip Morrison, a professor of physics at MIT, who played a starring if not dangerous role in the Manhattan Project; Jill Tarter at the Hat Creek Radio Observatory in California; Dr John Billingham, a British medical doctor at the Ames Research Center in California; Prof Antony Hewish of the University of Cambridge, who discovered pulsars in 1967; Frank Drake, and his work at the National Radio Astronomy Observatory in Green Bank, West Virginia; Barney Oliver of SETI; David Blair of the University of Western Australia; Paul Horowitz of Harvard University; the Ohio State University Radio Observatory (known as Big Ear) and its 1977 Wow! signal; Jack Cohen; chemist Stanley Miller and his 1953 experiment; blind SETI investigator Kent Cullers; and biologist Jared Diamond from UCLA. Jointly made with ABC of Australia, narrated by Heather Couper, directed by Richard Smith, produced by Stuart Carter, made by Pioneer Productions
== Awards and recognition == Eberlin was named among the Forbes "30 Under 30" list in 2015. She won the Marion Milligan Mason Award of the American Association for the Advancement of Science in 2016. The award is given every two years to promising young female researchers in chemistry. She won the MacArthur "Genius" Fellowship from the John D. and Catherine T. MacArthur Foundation in 2018 for her research on the use of mass spectrometry "to differentiate more quickly and accurately diseased from healthy tissues during surgery". She is the first UT Austin professor to win MacArthur grant this century. The award consists of a $625,000 no-strings-attached grant. According to the foundation, this award goes to "extraordinarily talented and creative individuals as an investment in their potential". She also won the Moore Inventor Fellowship in 2018. She received the 2020 Curt Brunnée Award from the International Mass Spectrometry Foundation. She was named on the Power List by the Analytical Scientist in 2014, 2018, 2019, 2021, 2022, 2023, and 2024. She received the 2024 Norman Hackerman Award from the Welch Foundation and the Biemann Medal from the American Society for Mass Spectrometry in 2025.
Those opposed to the term argue that while new tensions between Russia and the West over the Ukraine conflict have similarities with those during the Cold War, there are also major differences, and provide Russia with new avenues for exerting influence, such as in Belarus and Central Asia, which have not seen the type of direct military action in which Russia engaged in less cooperative former Soviet states like Ukraine and the Caucasus region. In June 2014, the Ministry of Defense of North Macedonia published an article asserting that the term "Cold War II" was as a misnomer. In February 2016, at the Munich Security Conference, NATO secretary general Jens Stoltenberg said that NATO and Russia were "not in a cold-war situation but also not in the partnership that we established at the end of the Cold War", while Russian Prime Minister Dmitry Medvedev, speaking of what he called NATO's "unfriendly and opaque" policy on Russia, said "One could go as far as to say that we have slid back to a new Cold War". In October 2016 and March 2017, Stoltenberg said that NATO did not seek "a new Cold War" or "a new arms race" with Russia.
The Atlantic drew parallels between Logan's abusive form of love for his children with the Lear line "Love's not love / when it is mingled with regards that stand / Aloof from th' entire point." The impossibility of Logan's aspirations was likened to that of Lear's by DePaul Law Review, with both figures simultaneously trying to accept their impeding deaths while refusing to abandon their positions in life.
=== Ethnopharmacological Perspectives === The Journal of Ethnopharmacology provides extensive documentation of insect based treatments in indigenous medicine. Ethnopharmacological research has revealed that insects are integral to traditional healing systems in many cultures. In South America ant and wasp venoms are used in pain management and inflammation control. Also in India scorpions and centipedes have been incorporated into Ayurvedic medicine for treating neurological disorders. These case studies illustrate the cultural diversity in insect based medicine and underscore the potential for modern pharmacological applications.
Sources: en.wikipedia.org
==== Colombia ==== According to a 2010 USDA Foreign Agricultural Service report, each small town in Colombia typically has a fresh food market that is supplied by local production and opens at least once a week. The report described both retail and wholesale markets that provide food products for "Mom'n Pop stores". It estimated the number of such markets at around 2,000, but noted that the number was slowly decreasing in large cities despite the presence of large markets like Corabastos in Bogotá.
To infect host cells SeV must first bind to cell surface receptors using its hemagglutinin-neuraminidase (HN) protein. The receptor-virus attaching process triggers a conformational change in HN, which allosterically promotes the viral fusion (F) protein to promote virus envelope – cell membrane fusion. The receptor attachment is cooperative with respect to receptor density. SeV cell entry receptors are represented mainly by glycoproteins and glycolipids. The table below lists all the molecules that have been shown to function as SeV receptors. Human sialoglycoprotein – cluster of differentiation (CD 235a) is an example of glycoproteins that facilitates SeV cell entry. However, other type of proteins that are not glycoproteins also can assist SeV to penetrate cells. Thus, C-type lectin represented by asialoglycoprotein receptor (ASGP-R), ASGR1) has been shown to be able to function as a SeV cell entry receptor. Among glycosphingolipids two types of glycans are serving as SeV receptors. The first type is represented by fucosylated glycans and the second one by sialylated glycans. The number, positioning, and chemical linkage of sialic acid-containing receptors can be an important determinant of the strength and efficiency of viral attachment, which can play an important role both in host and tissue tropism. The expression of molecules that can facilitate SeV cell entry, frequently accelerates carcinogenesis and metastasis development. The asialoglycoprotein receptor is highly expressed in liver cancers.
Genetic associations include mutations in pulmonary surfactant proteins A1, A2, C (SFTPA1, SFTPA2B) and mucin (MUC5B). A remarkable aspect of the MUC5B variant is its high frequency of detection, as it is found in approximately 20% of individuals with Northern and Western European ancestry and in 19% of the Framingham Heart Study population. Mutations in human telomerase genes are also associated with familial pulmonary fibrosis and in some patients with sporadic IPF (e.g. the TERT, TERC genes). Recently an X-linked mutation in a third telomerase-associated gene, dyskerin (DKC1), has been described in a family with IPF.
Ojos Locos (pronounced [ˈo.xos ˈlo.kos], Spanish for "Crazy Eyes") was founded in 2010 by restaurateurs Randy DeWitt, Jack Gibbons, Rich Hicks, and Todd East. DeWitt, the owner of parent company Front Burner Restaurants, had previously founded Twin Peaks, a chain of wilderness lodge-themed breastaurants, in 2005. The 2010 opening of the first Ojos Locos restaurant in Dallas coincided closely with the 2010 FIFA World Cup and the chain has consistently emphasized soccer as a principal sport to watch at its locations. Ojos Locos has been called a "Mexican Hooters" or "Twin Peaks for a Hispanic customer base" and markets itself to working class Hispanic men. Workers at the chain frequently speak both Spanish and English and The New York Times has singled out the restaurant as an example of an establishment that has thrived even during an anti-Spanish-language political environment. D Magazine cited it as being the best sports bar in Dallas in 2013. The servers at Ojos Locos are known as "chicas" and wear short skirts along with cleavage and midriff-baring outfits, leading the chain to colloquially be referred to as a "breastaurant". The food served is a mix of Mexican and Southwestern American food developed by chef John Franke, with tacos being a particular specialty. They are also known for their tall beer pitchers called "balones" that contain 100 US fluid ounces (3.0 L). As of 2020, there were thirteen locations across Texas, Arizona, and New Mexico.
Historically, the birth rate of teenagers peaked in the late 1950s and early 1960s. However, at that time, most teenage parents were married. In the early twenty-first century, nine in ten births to the age group 15-19 are to unmarried mothers. Social norms have changed; it is now not unusual for teenagers to delay or avoid sexual intercourse altogether. Younger teenagers are more likely to practice abstinence than their older counterparts. A report published by the Center for Disease Control and Prevention (CDC) in early 2018 found the number of high school students who have had sex fell from 47% in 2005 down to 41% in 2015, with the most dramatic drop taking place between 2013 and 2015. On top of that, among never-married teens who have had sex, overwhelming majorities reported they used contraception the first time they did it. There are a few reasons for this. First, Millennials and Generation Z are more focused on the consequences of sex than their predecessors were. Second, there has been growing concern over unwanted sexual advances, especially in the wake of the Me-too movement. Writing for The Spectator, Douglas Murray dubbed this the "sexual counter-revolution." Third, as a consequence of the precarious contemporary economy, young adults today are more likely to be living with their parents rather than on their own, with a romantic partner, or a spouse. A 2016 analysis by the CDC discovered that teenage birthrates nosedived between 1991, when they reached a crisis point, and 2014, when they dropped by 60%, a record low.
Sources: en.wikipedia.org
Legal status varies by country, but cardarine is not approved as a medicine in major jurisdictions. It is often sold as a research chemical, a category that may not be lawful for human use. Buyers should check local laws and product labels carefully.
Anti-doping laboratories use LC-MS/MS to detect GW501516 and its metabolites, usually in urine. The method can identify the parent compound at low concentrations. Detection windows vary with dose and individual factors.
No, cardarine has no approved medical uses in major jurisdictions. Early research explored metabolic conditions, but those programs were discontinued. It is not a registered treatment for any disease.
No. Cardarine is a PPARδ agonist, while selective androgen receptor modulators act on androgen receptors. The two classes differ in receptor target and downstream effects.