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Background And Regulatory Status — Hands-On Walkthrough

By Editorial Desk · published 2026-07-12 · last reviewed 2026-08-01 · Faq

This is a working overview of WADA Prohibited List, written for readers who want more than a one-paragraph summary but less than a textbook.

Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.

Background and Regulatory Status

Sporting authorities added GW501516 to prohibited lists after it appeared in athlete samples and online markets. The World Anti-Doping Agency classifies it as a hormone and metabolic modulator, and its use can lead to an anti-doping rule violation. Some early laboratory work suggested effects on fatty acid oxidation and endurance-related metabolism in animals, but those findings do not establish safe or effective use in people. Reports of adverse events in humans are scarce and often anecdotal, which complicates risk assessment.

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.

Detection, Regulation, and Quality Context

Cardarine can be detected in biological samples and product materials using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The method separates compounds by chromatography and identifies them by mass-to-charge transitions, allowing low-level detection in urine or blood. Sample preparation often involves enzymatic hydrolysis, solid-phase extraction, or protein precipitation. Certified reference materials and isotope-labeled internal standards improve quantification. Detection windows depend on metabolism, matrix, and assay sensitivity, so no single universal window applies.

Regulatory treatment of cardarine differs by context and jurisdiction. In competitive sport, the World Anti-Doping Agency lists PPARδ agonists, including GW501516, as prohibited at all times. Outside sport, it lacks approval as a prescription medicine in major drug markets, and products sold for human consumption may be treated as unapproved drugs. Some countries also restrict importation or sale through general consumer protection and medicines laws. These classifications affect availability, testing, and legal risk without establishing therapeutic value.

Because cardarine is not an approved medicine, no pharmacopeial monograph defines its identity, purity, or storage requirements. Laboratories typically rely on in-house methods and reference standards when testing materials labeled as GW501516. Certificates of analysis may report purity and identity for a specific batch, but their scope varies and they do not guarantee safety or legal status. Independent verification can include high-performance liquid chromatography, mass spectrometry, nuclear magnetic resonance, and elemental analysis. The distinction between research chemical labeling and human use is significant because quality standards and oversight differ.

Cardarine at a glance

PropertyValueNotes
IUPAC name{4-[({4-methyl-2-[4-(trifluoromethyl)phenyl]-1,3-thiazol-5-yl}methyl)sulfanyl]phenoxy}acetic acidSystematic name for GW501516
CAS Registry Number317318-70-0Unique identifier for the parent compound
Molecular formulaC21H18F3NO3S2Includes carbon, hydrogen, fluorine, nitrogen, oxygen, and sulfur
Molecular weight453.5 g/molApproximate value for the neutral form
AppearanceWhite to off-white powderTypical description for purified laboratory material

Regulation and Analytical Detection

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.

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.

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Mechanism and Safety Research

GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.

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.

Background and Research Context

Cardarine is a common name for GW501516, a synthetic compound developed in the 1990s through research collaborations involving GlaxoSmithKline. It belongs to a class of molecules known as peroxisome proliferator-activated receptor delta agonists. Early studies explored its effects on lipid metabolism and energy expenditure in animal models. The compound was never approved as a human medicine, and clinical development was discontinued. In the years since, it has appeared in fitness and bodybuilding communities as a performance-enhancing substance. Regulatory agencies classify it as an unapproved drug.

PPARδ is a nuclear receptor that regulates gene expression related to fatty acid oxidation, glucose homeostasis, and mitochondrial function. GW501516 binds to this receptor with high affinity and activates downstream signaling in skeletal muscle and other tissues. Animal studies reported increased endurance and altered fuel preference, but human data remain limited and inconsistent. The precise relationship between receptor activation and observed physiological changes is still an area of active investigation. Researchers have also examined whether the compound affects inflammation or cell proliferation. No approved therapeutic indication exists for cardarine.

Reference notes

The resulting Treaty of Córdoba, which was signed on 24 August, kept all existing laws, including the 1812 Constitution, in force until a new constitution for Mexico could be written. O'Donojú became part of the provisional governing junta until his death on 8 October. Both the Spanish Cortes and Ferdinand VII rejected the Treaty of Córdoba, and the final break with the mother country came on 19 May 1822, when the Mexican Congress conferred the throne on Iturbide. Spain initiated attempts to reconquer Mexico and it did not recognize Mexico's independence until 1836. Central America gained its independence along with New Spain. On 15 September 1821, an Act of Independence was signed in Guatemala City which declared Central America (Guatemala, Honduras, El Salvador, Nicaragua, and Costa Rica) independent from Spain. The regional elites supported the terms of the Plan of Iguala and orchestrated the union of Central America with the Mexican Empire in January 1822. One years later, following Iturbide's downfall, the region, with the exception of Chiapas, peacefully seceded from Mexico on 1 July 1823, establishing the Federal Republic of Central America. The new state existed for seventeen years, centrifugal forces pulling the individual provinces apart by 1840.

==== Francium ==== Francium is also predicted to show some differences due to its high atomic weight, causing its electrons to travel at considerable fractions of the speed of light and thus making relativistic effects more prominent. In contrast to the trend of decreasing electronegativities and ionisation energies of the alkali metals, francium's electronegativity and ionisation energy are predicted to be higher than caesium's due to the relativistic stabilisation of the 7s electrons; also, its atomic radius is expected to be abnormally low. Thus, contrary to expectation, caesium is the most reactive of the alkali metals, not francium. All known physical properties of francium also deviate from the clear trends going from lithium to caesium, such as the first ionisation energy, electron affinity, and anion polarisability, though due to the paucity of known data about francium many sources give extrapolated values, ignoring that relativistic effects make the trend from lithium to caesium become inapplicable at francium. Some of the few properties of francium that have been predicted taking relativity into account are the electron affinity (47.2 kJ/mol) and the enthalpy of dissociation of the Fr2 molecule (42.1 kJ/mol). The CsFr molecule is polarised as Cs+Fr−, showing that the 7s subshell of francium is much more strongly affected by relativistic effects than the 6s subshell of caesium.

Edgar Degas's 1876 painting The Absinthe Drinker or Glass of Absinthe (L'Absinthe) can be seen at the Musée d'Orsay epitomising the popular view of absinthe addicts as sodden and benumbed, and Émile Zola described its effects in his novel L'Assommoir. In 1905, Swiss farmer Jean Lanfray murdered his wife and two children and then attempted to kill himself after drinking absinthe. Lanfray had drunk a lot of wine and brandy before the killings, but that was overlooked or ignored, and blame for the murders was placed solely on his consumption of two glasses of absinthe. The Lanfray murders were the tipping point in this hotly debated topic, and a subsequent petition collected more than 82,000 signatures to ban it in Switzerland. A referendum was held on 5 July 1908. It was approved by voters, and the prohibition of absinthe was written into the Swiss constitution. In 1906, Belgium and Brazil banned the sale and distribution of absinthe although these were not the first countries to take such action. It had been banned as early as 1898 in the colony of the Congo Free State. The Netherlands banned it in 1909, Switzerland in 1910, the United States in 1912, and France in 1914. The prohibition of absinthe in France eventually led to the popularity of pastis, and to a lesser extent, ouzo, and other anise-flavoured spirits that do not contain wormwood.

Sources: en.wikipedia.org

Notes from published material

Arbitration by consent, s 240. Workplace determinations, s 275 50% vote to approve by staff after final offer of employer, s 182 Process to approve an agreement, ss 180–186 Agreements approved by FWC, not below NES and pass BOOT, s 55 BOOT, each employee must be better off than in an awards 193 Variation by same process as making: ss 207–224 FWC can approve termination if in public interest, s 225 - back to award unless terms incorporated - or if out of date, it limits productivity, etc.

=== Climate change === Ectomycorrhizal communities can be affected by increased CO2 and the consequent effects of climate change. In some studies, elevated CO2 levels increased fungal mycelium growth and increased EcM root colonization. Other EcM associations showed little response to elevated CO2. Increased temperatures also give a range of responses, some negative, and others positive. The EcM response to drought is complex since many species provide protection against root desiccation and improve the ability of the roots to take up water. Thus, EcMs protect their host plants during times of drought, although they may themselves be affected over time.

Seven Hezbollah members were killed during the clashes. The IDF shelled Meiss Ej Jabal Hospital, injuring a doctor. Lebanon's Ministry of Public Health condemned the attack, saying that "Israeli authorities were fully responsible for this unjustifiable act, which would have led to catastrophic results", and called for an investigation. The Amal Movement, an ally of Hezbollah, announced that a fighter was killed in a missile attack in the village of Rab El Thalathine which also wounded two other members on 11 November. These were the first casualties from the group since it joined the fighting. On 12 November, Hezbollah anti-tank missile and mortar attacks killed an employee of the Israel Electric Corporation who was conducting repair work and injured 21 other Israelis, including seven IDF members and six of the fatality's colleagues. Hezbollah also struck an IDF bulldozer in a separate attack. The IDF said it had launched a drone strike at a militant cell that tried to launch antitank missiles near Metula. Further clashes also killed one Hezbollah member. Following a Hezbollah strike on 13 November, the IDF responded with heavy shelling across southern Lebanon which reportedly killed two people, according to a first-responder organisation affiliated to the Hezbollah-allied Amal Movement. Unidentified fighters fired anti-tank guided missiles that injured two Israelis near Netu'a. An Israeli rocket struck near journalists in Yaroun, Lebanon, no casualties were reported. Hezbollah condemned the attack, which happened while the journalists were on a public tour in the town.

Sources: en.wikipedia.org

Frequently asked questions

Is cardarine approved for human use?

No. Major drug regulators have not approved GW501516 for treating any medical condition. Products sold as cardarine are typically unapproved research chemicals or supplements, so their contents and safety are not assured.

Why is cardarine banned in sport?

It is prohibited by the World Anti-Doping Agency as a hormone and metabolic modulator. Athletes who test positive for GW501516 can face sanctions, including suspensions and loss of results.

What is the difference between cardarine and GW501516?

Cardarine is a common or trade-style name, while GW501516 is the research code for the same chemical entity. Some sources also use Endurobol or GSK-516. The names refer to the same compound, not distinct drugs.

How is cardarine detected in anti-doping tests?

Anti-doping laboratories typically use LC-MS/MS to detect GW501516 and its metabolites in urine. The method is sensitive and can identify the compound at low concentrations. Detection depends on sample timing, metabolism, and the specific assay.

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