If you have been reading about Anti-doping and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-10-23. Where a claim depends on a specific study, the study is described rather than over-claimed.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
Activation of PPARδ changes transcription of genes involved in fatty acid transport, mitochondrial function, and skeletal muscle fuel preference. In rodent studies, pharmacological PPARδ activation was associated with increased endurance and altered body composition. These findings generated interest in performance enhancement, but species differences and study designs limit direct extrapolation to humans. Small human trials were conducted in the 2000s and later discontinued. The extent to which cardarine produces similar metabolic or performance effects in people remains an open question.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic PPARδ agonist | Not a steroid or a selective androgen receptor modulator. |
| Common synonyms | Cardarine, GW501516, GW-501516, endurobol | Names vary by supplier and literature source. |
| Appearance | White to off-white powder | Consistent with many small-molecule research chemicals. |
| Solubility | Low in water; soluble in DMSO and ethanol | Often prepared in organic solvent for laboratory work. |
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid and energy metabolism. |
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 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.
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.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
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.
== Commercialization == There are several liposome medicines currently available commercially, which helps set the regulatory pathway for immunoliposome therapies. As immunoliposome therapy has progressed in research, big market players in pharmaceutical research and manufacturing have invested in the development of these therapies. A relevant example of this is a phase I/II trial that examined the effectiveness of PDS0101 in combination with pembrolizumab, an immune checkpoint inhibitor (sold under the brand name Keytruda). The study is funded by PDS Biotechnology and in partnership with Merck. The purpose of the study is to determine the effectiveness of PDS0101 + pembrolizumab in shrinking tumors in patients with virus-related oropharyngeal cancer tumors in humans. PDS0101 is a peptide-based vaccine that aids in the immune response to kill tumor cells. The study also relies on pembrolizumab monoclonal antibodies to help the body's immune system attack the cancer and interfere with the spread of tumor cells. Although immunoliposome therapy exhibits clinical and commercial promise, there are several known challenges in the translation from laboratory studies to clinical studies and ultimately to commercialization. One obstacle is that immunoliposome therapy is limited by having a short half-life and retention time once it reaches the tumor microenvironment. Additionally, immunoliposome therapies are often individualized which requires close clinical monitoring and comprehensive evaluation methods.
== D == DE – Delayed extraction DADI – Direct analysis of daughter ions DAPPI – Desorption atmospheric pressure photoionization DEP – Direct exposure probe DESI – Desorption electrospray ionization DIOS – Desorption/ionization on silicon DIP – Direct insertion probe DART – Direct analysis in real time DLI – Direct liquid introduction DIA – Data independent acquisition
This is mathematically incorrect (if the rule was precisely accurate the required temperature increase would be about 15.8 °C (28.4 °F)), and in any case the rule is only a rough approximation and cannot always be relied on. Chemists often use the more comprehensive Arrhenius equation for better estimations. The same is true, up to a point, of the chemical reactions of living things. They are usually catalyzed by enzymes which change reaction rates, but with no variation in catalytic action, the rule of thumb is still mostly applicable. In the case of bacteria and fungi, the reactions needed to feed and reproduce speed up at higher temperatures, up to the point that the proteins and other compounds in their cells themselves begin to break down, or denature, so quickly that they cannot be replaced. This is why high temperatures kill bacteria and other micro-organisms: 'tissue' breakdown reactions reach such rates that they cannot be compensated for and the cell dies. On the other hand, 'elevated' temperatures short of these result in increased growth and reproduction; if the organism is harmful, perhaps to dangerous levels. Just as temperature increases speed up reactions, temperature decreases reduce them. Therefore, to make explosives stable for longer periods, or to keep rubber bands springy, or to force bacteria to slow down their growth, they can be cooled. That is why shelf life is generally extended by temperature control: (refrigeration, insulated shipping containers, controlled cold chain, etc.) and why some medicines and foods must be refrigerated.
=== Vitrification === Vitrification is a flash-freezing (ultra-rapid cooling) process that helps to prevent the formation of ice crystals and helps prevent cryopreservation damage. Researchers Greg Fahy and William F. Rall helped to introduce vitrification to reproductive cryopreservation in the mid-1980s. As of 2000, researchers claim vitrification provides the benefits of cryopreservation without damage due to ice crystal formation. The situation became more complex with the development of tissue engineering as both cells and biomaterials need to remain ice-free to preserve high cell viability and functions, integrity of constructs and structure of biomaterials. Vitrification of tissue engineered constructs was first reported by Lilia Kuleshova, who also was the first scientist to achieve vitrification of oocytes, which resulted in live birth in 1999. For clinical cryopreservation, vitrification usually requires the addition of cryoprotectants before cooling. Cryoprotectants are macromolecules added to the freezing medium to protect cells from the detrimental effects of intracellular ice crystal formation or from the solution effects, during the process of freezing and thawing. They permit a higher degree of cell survival during freezing, to lower the freezing point, to protect cell membrane from freeze-related injury. Cryoprotectants have high solubility, low toxicity at high concentrations, low molecular weight and the ability to interact with water via hydrogen bonding. Instead of crystallizing, the syrupy solution becomes an amorphous ice—it vitrifies.
== Overdose == There have been cases of death with dimethyltryptamine (DMT). In terms of extrapolated human lethal dose based on animal studies and human case reports, the lethal dose of ayahuasca relative to a typical recreational or entheogenic dose is estimated to be 50-fold.
Sources: en.wikipedia.org
== Career and contributions == After receiving his Ph.D., Nasatir taught Latin American History for one year at the University of Iowa. Beginning in 1927, taught for 50 years at San Diego State University. In 1986 SDSU named a wing of its social sciences building in his honor, along with a named endowed chair in the SDSU History department. Nasatir was the recipient of four Fulbright fellowships, and traveled to France, Spain and Chile for research. He published 19 books, and is credited with publishing some 300,000 pages of documents, studies and translations. He was named Distinguished Professor of the California State College System. He received the Henry R. Wagner Medal of Honor. He presided over the international chapter of Phi Alpha Theta, an international history honor society. In 1985 Nasatir's house was among those destroyed in the Normal Heights fire, along with 500,000 documents and 2,500 books in his possession. Although this was a truly significant loss, Nasatir had published or used extensively as sources in publication such a large percentage of the documents he had in his possession that the loss was not as devastating as it would have otherwise been. Some of his papers ended up being restored through a freeze-drying salvage process.
=== Drug interactions === Administration of chloramphenicol concomitantly with bone marrow depressant drugs is contraindicated, although concerns over aplastic anaemia associated with ocular chloramphenicol have largely been discounted. Chloramphenicol is a potent inhibitor of the cytochrome P450 isoforms CYP2C19 and CYP3A4 in the liver. Inhibition of CYP2C19 causes decreased metabolism and therefore increased levels of, for example, antidepressants, antiepileptics, proton-pump inhibitors, and anticoagulants if they are given concomitantly. Inhibition of CYP3A4 causes increased levels of, for example, calcium channel blockers, immunosuppressants, chemotherapeutic drugs, benzodiazepines, azole antifungals, tricyclic antidepressants, macrolide antibiotics, SSRIs, statins, cardiac antiarrhythmics, antivirals, anticoagulants, and PDE5 inhibitors.
=== 19S regulatory particle === The 19S particle in eukaryotes consists of 19 individual proteins and is divisible into two subassemblies, a 9-subunit base that binds directly to the α ring of the 20S core particle, and a 10-subunit lid. Six of the nine base proteins are ATPase subunits from the AAA Family, and an evolutionary homolog of these ATPases exists in archaea, called PAN (proteasome-activating nucleotidase). The association of the 19S and 20S particles requires the binding of ATP to the 19S ATPase subunits, and ATP hydrolysis is required for the assembled complex to degrade folded and ubiquitinated proteins. Note that only the step of substrate unfolding requires energy from ATP hydrolysis, while ATP-binding alone can support all the other steps required for protein degradation (e.g., complex assembly, gate opening, translocation, and proteolysis). In fact, ATP binding to the ATPases by itself supports the rapid degradation of unfolded proteins. However, while ATP hydrolysis is required for unfolding only, it is not yet clear whether this energy may be used in the coupling of some of these steps.
=== Hormonal === Inhibition of ceramide synthesis with myriocin in obese mice may lead to both improved leptin signaling and decreased insulin resistance by decreasing SOCS-3 expression. An elevated level of ceramide can cause insulin resistance by inhibiting the ability of insulin to activate the insulin signal transduction pathway and/or via the activation of JNK.
The Unionists, by and large, regarded Germany as a dangerous rival, and rejoiced at the chance to destroy her. They meant to fight a hard-headed war by ruthless methods; they condemned Liberal 'softness' before the war and now. The Liberals insisted on remaining high-minded. Many of them had come to support the war only when the Germans invaded Belgium. [...] Entering the war for idealistic motives, the Liberals wished to fight it by noble means and found it harder to abandon their principles than to endure defeat in the field. The 1915 coalition fell apart at the end of 1916, when the Conservatives withdrew their support from Asquith and gave it instead to Lloyd George, who became prime minister at the head of a new coalition largely made up of Conservatives. Asquith and his followers moved to the opposition benches in Parliament and the Liberal Party was deeply split once again.
Sources: en.wikipedia.org
Despite protests against a plan to incinerate the hazardous waste in Pithampur, on January 1, 2025, an overnight caravan of a dozen semi trucks with police escort, a quick-response team, fire engines and ambulances delivered 377 tons of waste to Pithampur Industrial Area for incineration. Despite promises that the several hundred tons of toxic waste will be processed safely and responsibly, protests continued in Pithampur.
The regular formation of alpha-sheet by unfolded proteins inevitably involves many L amino acid residues readily adopting the alphaL conformation, which appears at first sight to go against textbook chemistry, which is that, of the 20 amino acids, it is glycine that strongly favours this conformation. The conundrum is resolved by realizing that the alphaL region comprises two overlapping areas, here called γL and αL, which should be considered separately. It turns out that, while the γL conformation is adopted, almost exclusively, by glycine, the αL conformation of alpha-sheet is more commonly, or about as commonly, adopted by any of 15 L-amino acids compared to glycine, the exceptions being proline, threonine, valine and isoleucine, which are rare at this conformation. Hence, of the 20 amino acids, 16 readily adopt the αL conformation.
== Operating units == NOCS currently has four facilities with over 15,000,000 cubic feet of refrigerated space located in three strategic port cities: New Orleans, LA; Houston, TX; and Charleston, SC.
Flay opened a second Mesa Grill at Caesars Palace in Las Vegas in 2004, and in 2005 he opened Bar Americain, an American Brasserie, in Midtown Manhattan. He continued to expand his restaurants by opening Bobby Flay Steak in the Borgata Hotel Casino & Spa in Atlantic City, New Jersey. This was followed by a third Mesa Grill in the Bahamas, located in The Cove at Atlantis Paradise Island, which opened on March 28, 2007. The Las Vegas Mesa Grill earned Flay his only Michelin Star in 2008, which was taken away in the 2009 edition. Michelin did not publish a 2010 or 2011 Las Vegas edition, so the star could not be re-earned. Bolo Bar & Restaurant closed its doors on December 31, 2007, to make way for a condominium. Aside from his restaurants and television shows, Flay has been a master instructor and visiting chef at the French Culinary Institute. Although he is not currently teaching classes, he occasionally visits when his schedule permits. Flay established the Bobby Flay Scholarship in 2003. This full scholarship to the French Culinary Institute is awarded annually to a student in the Long Island City Culinary Arts Program. Flay personally helps select the awardee each year. Flay opened his first Bobby's Burger Palace (BBP) at the Smith Haven Mall in Lake Grove, Long Island, on July 15, 2008. At its peak, BBP had nineteen locations in eleven states and the District of Columbia. The original Mesa Grill in New York closed in September 2013 following a proposed rent increase by the landlord.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist. It is not a steroid or a selective androgen receptor modulator. It was developed and studied as a research compound for metabolic pathways.
It binds to and activates PPARδ, a nuclear receptor that regulates genes related to fatty acid oxidation and energy use. This activation alters transcription in tissues such as skeletal muscle and liver. The full range of downstream effects in humans is not fully established.
No, cardarine is not known to occur naturally in plants, animals, or humans. It is a synthetic molecule produced for laboratory research. Products labeled as cardarine should therefore be treated as manufactured chemicals with variable purity.
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.