metabolite is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-03-28. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516, GW-501516, GW 501516, endurobol | Names vary in research and anti-doping documents. |
| Chemical class | Synthetic PPARδ agonist | Small-molecule nuclear receptor ligand. |
| CAS Registry Number | 317318-70-0 | Identifier commonly associated with GW501516. |
| Appearance | White to off-white powder | Typical for purified research material. |
| Solubility | Low in water; soluble in DMSO and ethanol | Organic solvents are common for laboratory stock solutions. |
Anti-doping laboratories detect GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be used in some programs. Detection depends on factors such as dose, timing, metabolism, and the sensitivity of the assay. Published methods describe limits of detection in the low nanogram per milliliter range for related compounds. Exact detection windows are not fixed for all situations and remain an area of ongoing study.
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.
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.
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.
Anti-doping laboratories identify GW501516 and related metabolites using liquid chromatography coupled with tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be analyzed. The method targets the parent compound and phase I and phase II metabolites, which extend the detection window. Because the substance is prohibited at all times, athletes can be tested outside competition. Detection limits and windows depend on the assay, sample type, and individual metabolism.
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.
Casein kinase I isoform delta also known as CKI-delta or CK1δ is an enzyme that in humans is encoded by the gene CSNK1D, which is located on chromosome 17 (17q25.3). It is a member of the CK1 (formerly named casein kinase 1) family of serine/threonine specific eukaryotic protein kinases encompassing seven distinct isoforms (CK1α, γ1-3, δ, ε) as well as various post-transcriptionally processed splice variants (transcription variants, TVs) in mammalians. Meanwhile, CK1δ homologous proteins have been isolated from organisms like yeast, basidiomycetes, plants, algae, and protozoa.
The conquest of Armanum (location unknown but proposed as Tall Bazi) with its ruler Rid-Adad and Ebla (55 kilometers southwest of modern Aleppo) by Naram-Sin (Ebla was also defeated by his grandfather Sargon) is known from one of his year names "The year the king went on a campaign in Amarnum" and from an Old Babylonian copy of a statue inscription (IM 85461) found at Ur. There are also three objects, a marble lamp, a stone plaque, and a copper bowl, inscribed "Naram-Sin, the mighty, king of the four quarters, conqueror of Armanum and Ebla.". In 2010 a new stele fragment (IM 221139) describing the campaign was found at Tulul al-Baqarat (thought to be the ancient city of Kesh.
=== Domestic pressures in Israel === Netanyahu has faced charges for corruption, and the war may have helped him avoid dealing with these. The war may also help the Israeli government to overhaul Israel's Supreme Court, mitigate criticism of Israel's treatment of Palestinians, and help Netanyahu with the 2026 Israeli legislative election. The war has made Netanyahu more popular, increasing his approval rating from a tie with Naftali Bennett to 62%. Some analysts suggest that Netanyahu will call for a snap election due to the extra support from the war.
The National Association of Newspapers spoke about the case in a statement:The ANJ follows with concern and expresses its repudiation of attempts at intimidation against O Estado de S.Paulo and its Politics editor, Andreza Matais, after the newspaper disclosed the access of the wife of a leader of organized crime in Amazonas to offices of the Ministry of Justice. The use of intimidation methods against outlets and journalists is not consistent with democratic values and demonstrates blatant disrespect for freedom of the press. It also shows a practice characteristic of autocratic regimes of, with the support of political leaders, pro-government sites and influencers, attempting to divert attention from uncomfortable reporting by attacking those who investigate and disclose it. The ANJ expects such intimidation methods, especially against women journalists already employed in the recent past, to cease immediately, in the name of respect for freedom of the press and the free exercise of journalism and communication outlets.
=== Availability === Cyclofenil remains available today only in Brazil, Italy, and Japan. In the past, it has also been available in France, Germany, Mexico, Sweden, Switzerland, Turkey, and the United Kingdom.
Sources: en.wikipedia.org
These discoveries led numerous countries to begin working on the development of nuclear weapons and nuclear power. Despite fission having been discovered in Germany, the Uranverein ("uranium club") Germany's wartime project to research nuclear power and/or weapons was hampered by limited resources, infighting, the exile or non-involvement of several prominent scientists in the field and several crucial mistakes such as failing to account for impurities in available graphite samples which made it appear less suitable as a neutron moderator than it is in reality. Germany's attempts to build a natural uranium / heavy water reactor had not come close to reaching criticality by the time the Americans reached Haigerloch, the site of the last German wartime reactor experiment. On 2 December 1942, as part of the Manhattan Project, another team led by Enrico Fermi was able to initiate the first artificial self-sustained nuclear chain reaction, Chicago Pile-1. An initial plan using enriched uranium-235 was abandoned as it was as yet unavailable in sufficient quantities. Working in a lab below the stands of Stagg Field at the University of Chicago, the team created the conditions needed for such a reaction by piling together 360 tonnes of graphite, 53 tonnes of uranium oxide, and 5.5 tonnes of uranium metal, most of which was supplied by Westinghouse Lamp Plant in a makeshift production process.
== Clinical significance == Hepatokines can serve as biomarkers and are potential therapeutic targets for metabolic diseases. The liver through execretion of hepatokines regulates the whole bodies metabolism in response to stress signals. Secreted hepatokines in response to exercise induce favorable metabolic changes in fat, blood vessels, and skeletal muscle that can reduce metabolic diseases. Although substantial progress has been made in understanding disease-controlled production of hepatokines, there is still so much to discover. There is so much room for discovery. For example, "little is known about the inductive mechanism of transcriptional reprogramming, protein translation, modification, and secretion of hepatokines, particularly through the ER and Golgi, and more. The identification and functional characterization of hepatokines may provide significant insights that could help in better understanding of MetS pathogenesis.
Nederlandse Omroep Stichting (Dutch pronunciation: [ˈneːdərlɑntsə ˈʔɔmrup ˈstɪxtɪŋ]; NOS [ˌɛnoːˈɛs] or rarely [nɔs]; English: Dutch Broadcasting Foundation) is one of the broadcasting organisations making up the Dutch public broadcasting system. Funded by the Dutch government, it has a special statutory obligation to make news and sports programmes for the three Dutch public television channels and the public radio services. The foundation's remit derives from the Dutch Media Act 2008, which stipulates that NOS produce regular and frequent programming of a public service nature, including, notably, a full and impartial news service and coverage of parliamentary procedures and debates, as well as reporting on sporting and other national events. NOS also acts as a technical coordinator for the Dutch public broadcasting system as a whole. In the event of emergencies and/or the breaking of a major news story, it can assume control of the public networks to provide coordinated coverage of events in cooperation with the other members of the system. NOS has correspondents in multiple countries, including a permanent studio in Washington, D.C. Programmes produced by NOS include its daily television and radio bulletins, the NOS Journaal. Parliamentary reports are shown from a special studio in the Hague. It also supplies news programmes aimed at children (Jeugdjournaal), teens (NOS Stories), young adults (NOS op 3), and sports followers (NOS Langs de Lijn, NOS Studio Sport). Programmes are made available via television, radio, and online.
Staining is a technique used to enhance contrast in samples, generally at the microscopic level. Stains and dyes are frequently used in histology (microscopic study of biological tissues), in cytology (microscopic study of cells), and in the medical fields of histopathology, hematology, and cytopathology that focus on the study and diagnoses of diseases at the microscopic level. Stains may be used to define biological tissues (highlighting, for example, muscle fibers or connective tissue), cell populations (classifying different blood cells), or organelles within individual cells. In biochemistry, it involves adding a class-specific (DNA, proteins, lipids, carbohydrates) dye to a substrate to qualify or quantify the presence of a specific compound. Staining and fluorescent tagging can serve similar purposes. Biological staining is also used to mark cells in flow cytometry, and to flag proteins or nucleic acids in gel electrophoresis. Light microscopes are used for viewing stained samples at high magnification, typically using bright-field or epi-fluorescence illumination. Staining is not limited to only biological materials, since it can also be used to study the structure of other materials; for example, the lamellar structures of semi-crystalline polymers or the domain structures of block copolymers.
Sources: en.wikipedia.org
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.
No. Cardarine is not a steroid hormone; it targets the nuclear receptor PPARδ. Its classification in anti-doping rules differs from anabolic steroids, though it remains prohibited in sport.
Early rodent studies reported tumor formation at multiple sites, which raised safety concerns. Sponsors stopped clinical development, and no approved human product exists.
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.