GW501516 comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2025-09-19. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
A common misconception is that cardarine has been proven safe for human use. In reality, human clinical data are limited, and long-term animal studies have raised concerns about cancer. Another misconception is that it is a supplement or vitamin-like compound. It is a synthetic research chemical with no approved medical indication. Scientific discussion often focuses on its mechanism and detection rather than therapeutic use. Regulatory and anti-doping literature treats it primarily as a prohibited substance.
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.
| 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. |
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
Cardarine is a common name for GW501516, a synthetic compound first described in the 1990s as a selective agonist of the peroxisome proliferator-activated receptor delta. It was studied in preclinical models for metabolic and cardiovascular conditions, but it has not been approved as a medicine in the United States, Europe, or other major jurisdictions. Retail products labeled as cardarine are generally research chemicals or supplements, not pharmaceutical formulations. Because human safety and efficacy data remain limited, regulatory agencies treat it as an unapproved substance rather than a therapeutic product.
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.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
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.
=== Gastrointestinal === NSAIDs cause an increase in the risk of serious gastrointestinal adverse events including bleeding, ulceration, and perforation of the stomach or intestines, which can be fatal. Elderly patients are at greater risk for serious gastrointestinal events.
Ahizechukwu Chigoziem Eke is a Nigerian-American physician-scientist, obstetrician-gynecologist, and specialist in maternal-fetal medicine. He is a 2024 recipient of the NIH Director's Pioneer Award, and has led influential pharmacologic research in pregnant women. He is an Associate Professor in the Division of maternal-fetal medicine at the Johns Hopkins University School of Medicine, where he directs the integrated maternal-fetal medicine research program. Eke is internationally recognized for his research in pharmacology in pregnancy and lactation, with contributions spanning clinical pharmacology, infectious diseases in pregnancy, translational science, and implementation research.
=== Telechelic oligomer approach === The telechelic oligomer approach applies the usual polymerization manner except that one includes a monofunctional reactant to stop reaction at the oligomer stage, generally in the 50–3000 molecular weight. The monofunctional reactant not only limits polymerization but end-caps the oligomer with functional groups capable of subsequent reaction to achieve curing of the oligomer. Functional groups like alkyne, norbornene, maleimide, nitrite, and cyanate have been used for this purpose. Maleimide and norbornene end-capped oligomers can be cured by heating. Alkyne, nitrile, and cyanate end-capped oligomers can undergo cyclotrimerization, yielding aromatic structures.
== Classification == In the third edition of the International Classification of Sleep Disorders (ICSD-3), obstructive sleep apnea is classified amongst the sleep-related breathing disorders and is divided in two categories, namely adult OSA and pediatric OSA. Obstructive sleep apnea is differentiated from central sleep apnea (CSA), which is characterized by episodes of reduction or cessation in breathing attributable to decreased effort, rather than upper airway obstruction. The respiratory effort must then be assessed in order to correctly classify the apnea as obstructive given the specificity of the diaphragmatic activity in this condition: the inspiratory effort is continued or increased through the entire episode of absent airflow. When hypopneas are present alongside apneas, the term obstructive sleep apnea-hypopnea is used. If it is associated with daytime sleepiness and other daytime symptoms, it is known as obstructive sleep apnea-hypopnea syndrome. To be categorized as obstructive, the hypopnea must meet one or more of the following symptoms: (1) snoring during the event, (2) increased oronasal flow flattening, or (3) thoraco-abdominal paradoxical respiration during the event. If none of them are present during the event, then it is categorized as central hypopnea.
Sources: en.wikipedia.org
== Interactions == Collagen, type VII, alpha 1 forms a complex network with several other proteins in the basement membrane. It has been shown to interact with laminin 5 and fibronectin, as well as collagen IV, by binding these proteins in the NC-1 domain. The stability of the basement membrane and dermal-epidermal junction is thought to be due to these interactions.
l-Kynurenine is a metabolite of the amino acid l-tryptophan used in the production of niacin. Kynurenine is synthesized by the enzyme tryptophan dioxygenase, which is made primarily but not exclusively in the liver, and indoleamine 2,3-dioxygenase, which is made in many tissues in response to immune activation. An important source is the intestine. Kynurenine and its further breakdown products carry out diverse biological functions, including dilating blood vessels during inflammation and regulating the immune response. Some cancers increase kynurenine production, which increases tumor growth.
==== Water cleaning technology ==== In 2017 the RingwooditE Co Ltd was formed in order to explore Thermonuclear Trap Technology (TTT) for the purpose of cleaning all sources of water from pollution and toxic contents. This patented nanotechnology uses a high pressure and temperature chamber to separate isotopes that should by nature not be in drinking water to pure drinking water, as to the by the WHO´s established classification. This method has been developed by among others, by professor Vladimir Afanasiew, at the Moscow Nuclear Institution. This technology is targeted to clean Sea, river, lake and landfill waste waters. It even removes radioactive isotopes from the sea water, after Nuclear Power Stations catastrophes and cooling water plant towers. By this technology pharmaca rests are being removed as well as narcotics and tranquilizers. Bottom layers and sides at lake and rivers can be returned, after being cleaned. Machinery used for this purpose are much similar to those of deep sea mining. Removed waste items are being sorted by the process, and can be re used as raw material for other industrial production.
An example of an RNA aptamer therapy includes Pegaptanib (aka Macugen ® ), the only FDA-approved RNA aptamer treatment. Originally approved in 2004 to treat age-related macular degeneration, Pegaptanib is a 28 nucleotide RNA aptamer that acts as a VEGF antagonist. However, it is not as effective as antibody-based treatments such as bevacizumab and ranibizumab. Another example of an RNA aptamer therapeutic is NOX-A12, a 45 nucleotide RNA aptamer that is in clinical trials for chronic lymphocytic leukemia, pancreatic cancer, as well as other cancers. NOX-A12 acts as antagonist for CXCL12/SDF-1, a chemokine involved in tumor growth.
According to the February 1921 census, 3,123,000 native German speakers lived in Czechoslovakia, 23.4% of the total population. The controversies between the Czechs and the German-speaking minority lingered on throughout the 1920s and intensified in the 1930s. During the Great Depression, the mostly-mountainous regions populated by the German minority, together with other peripheral regions of Czechoslovakia, were hurt by the economic depression more than the interior of the country was. Unlike the less developed regions (Carpathian Ruthenia, Moravian Wallachia), the Sudetenland had a high concentration of vulnerable export-dependent industries (such as glass works, textile industry, paper-making and toy-making industry). Sixty percent of the bijouterie and glassmaking industry were located in the Sudetenland, and 69% of employees in the sector were German-speaking according to mother tongue, and 95% of bijouterie and 78% of other glassware was produced for export. The glass-making sector was affected by decreased spending power and by protective measures in other countries, and many German workers lost their work. The high unemployment, as well as the imposition of Czech in schools and all public spaces, made people more open to populist and extremist movements such as fascism, communism and German irredentism. In those years, parties of German nationalists and later the Sudeten German Party (SdP), with its radical demands gained immense popularity, among Germans in Czechoslovakia.
Sources: en.wikipedia.org
==== Service and development ==== Education Committee Higher Education and Scientific Research Committee Health Committee Agriculture and Food Security Committee Energy Committee Transport and Navigation Committee Tourism Committee Culture Committee Heritage and Cultural Diversity Committee
== Conservation == The conservation of hydrothermal vents has been the subject of sometimes heated discussion in the oceanographic community for the last 20 years. It has been pointed out that it may be that those causing the most damage to these fairly rare habitats are scientists. There have been attempts to forge agreements over the behaviour of scientists investigating vent sites, but, although there is an agreed code of practice, there is no formal international and legally binding agreement. Mineral extraction A key talking point surrounding the conservation of hydrothermal vent ecosystems is deep sea mining. There are four main mineral resources that are under consideration for commercial extraction: manganese nodules, cobalt-rich crusts, Seafloor massive sulfide deposits and phosphorite nodules. Seafloor massive sulfide depositions surrounding hydrothermal vents are a central area of discussion. As discussed above, black smokers produce an abundance of sulfides primarily through the production of Iron Sulfides, namely Pyrite. This sulfide production leads to high sulfide deposition local to many black smokers. Central to the conservation conversation, is weighing the possibilities for sustainable use of newly harvested sulfide against the effects of commercially attaining this sulfide via deep sea mining. The effects of commercially extracting deep sea minerals are largely unknown due to the extremely dynamic nature of a hydrothermal vents ecosystem.
== Prevalence == The prevalence of HLA-B27 varies markedly in the global population. In the United States, the estimated prevalence is 6-8%. 4% of North Africans, 2–9% of Chinese, and 0.1–0.5% of persons of Japanese descent possess the gene that codes for this antigen. Among the Sami in Northern Scandinavia (Sápmi), 24% of people are HLA-B27 positive, while 1.8% have associated ankylosing spondylitis, compared to 14-16% of Northern Scandinavians in general. In Finland, an estimated 14% of the population is positive for HLA-B27, while more than 95% of patients with ankylosing spondylitis and approximately 70–80% of patients with reactive arthritis have the genetic marker.
The parasagittal (Greek πᾰρᾰ́ (pará), beside) or paramedian or sagittal planes (Latin sagitta, arrow), which include the median or midsagittal plane and divide the body into left and right (in reference to the subject and not the observer). The frontal or coronal plane (Latin corona, crown), which divide the body into front and back. The axial or horizontal or transverse plane (Latin trans, across; vetere, to turn), which is perpendicular to the other two planes. The transpyloric plane, the subcostal plane, and the transumbilical plane planes are also considered in the division of the torso into the quadrants and regions of the abdomen. The three main axes of a human are the left-right (or horizontal or frontal), the craniocaudal (or rostrocaudal, longitudinal, or cephalocaudal), and the anteroposterior (or dorsoventral or sagittal) axes. Other anatomical lines include the axillary lines, parasternal line, and scapular line.
=== Factors determining accuracy === Lupus anticoagulant, a circulating inhibitor predisposing for thrombosis, may skew PT results, depending on the assay used. Variations between various thromboplastin preparations have in the past led to decreased accuracy of INR readings, and a 2005 study suggested that despite international calibration efforts (by INR) there were still statistically significant differences between various kits, casting doubt on the long-term tenability of PT/INR as a measure for anticoagulant therapy. Indeed, a new prothrombin time variant, the Fiix prothrombin time, intended solely for monitoring warfarin and other vitamin K antagonists has been invented and recently become available as a manufactured test. The Fiix prothrombin time is only affected by reductions in factor II and/or factor X and this stabilizes the anticoagulant effect and appears to improve clinical outcome according to an investigator initiated randomized blinded clinical trial, The Fiix-trial. In this trial thromboembolism was reduced by 50% during long-term treatment and despite that bleeding was not increased.
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.
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.