A practical reference on Nuclear receptor: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-05-08 and is reviewed periodically as new material appears.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| IUPAC name | {4-[({4-methyl-2-[4-(trifluoromethyl)phenyl]-1,3-thiazol-5-yl}methyl)sulfanyl]phenoxy}acetic acid | Systematic name for GW501516 |
| CAS Registry Number | 317318-70-0 | Unique identifier for the parent compound |
| Molecular formula | C21H18F3NO3S2 | Includes carbon, hydrogen, fluorine, nitrogen, oxygen, and sulfur |
| Molecular weight | 453.5 g/mol | Approximate value for the neutral form |
| Appearance | White to off-white powder | Typical description for purified laboratory material |
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
GW501516 binds and activates PPARδ, a nuclear receptor that influences transcription of genes involved in fatty acid oxidation and energy use. Activation shifts some metabolic pathways in preclinical models, which is why the compound has been studied for lipid disorders and exercise-related endpoints. The exact downstream effects in humans are incompletely mapped. PPARδ is expressed in many tissues, including skeletal muscle, liver, and adipose tissue, so broad activation may have varied consequences. Researchers continue to examine how selective or partial activation might alter the balance between benefits and risks.
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
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.
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.
Mutations in CaV1.2, a voltage gated Ca2+ channel, lead to Timothy syndrome, which causes severe cardiac arrhythmia (long-QT) along with syndactyly and similar craniofacial defects to Andersen-Tawil syndrome including cleft or high-arched palate, micrognathia, low set ears, syndactyly and brachydactyly. While these channelopathies are rare, they show that functional ion channels are important for development. Furthermore, in utero exposure to anti-epileptic medications that target some ion channels also cause increased incidence of birth defects such as oral cleft. The effects of both genetic and exogenous disruption of ion channels lend insight into the importance of bioelectric signaling in development.
India will allow foreign groups to own up to 51 per cent in "multi-brand retailers", as supermarkets are known in India, in the most radical pro-liberalisation reform passed by an Indian cabinet in years; single brand retailers, such as Apple and Ikea, can own 100 percent of their Indian stores, up from the previous cap of 51 percent; both multi-brand and single brand stores in India will have to source nearly a third of their goods from small and medium-sized Indian suppliers; all multi-brand and single brand stores in India must confine their operations to 53-odd cities with a population over one million, out of some 7935 towns and cities in India. It is expected that these stores will now have full access to over 200 million urban consumers in India; multi-brand retailers must have a minimum investment of US$100 million with at least half of the amount invested in back end infrastructure, including cold chains, refrigeration, transportation, packing, sorting and processing to considerably reduce the post harvest losses and bring remunerative prices to farmers; the opening of retail competition will be within India's federal structure of government. In other words, the policy is an enabling legal framework for India. The states of India have the prerogative to accept it and implement it, or they can decide to not implement it if they so choose. Actual implementation of policy will be within the parameters of state laws and regulations. The opening of retail industry to global competition is expected to spur a retail rush to India.
Among the British firms that dominated the colony in the late 19th century was the Belize Estate and Produce Company, which eventually acquired half of all privately held land and eventually eliminated peonage. Belize Estate's influence accounts in part for the colony's reliance on the mahogany trade throughout the rest of the 19th century and the first half of the 20th century. The Great Depression of the 1930s caused a near-collapse of the colony's economy as British demand for timber plummeted. The effects of widespread unemployment were worsened by a devastating hurricane that struck the colony in 1931. Perceptions of the government's relief effort as inadequate were aggravated by its refusal to legalize labour unions or introduce a minimum wage. Economic conditions improved during World War II, as many Belizean men entered the armed forces or otherwise contributed to the war effort.
There are more than 50 types of treatments for CTS with varied levels of evidence and recommendations across healthcare guidelines, with evidence most strongly supporting surgery, steroids, splinting for wrist positioning, and physical or occupational therapy interventions. When selecting treatment, it is important to consider the severity and chronicity of the CTS pathophysiology and to distinguish treatments that can alter the natural history of the pathophysiology (disease-modifying treatments) and treatments that only alleviate symptoms (palliative treatments). The strongest evidence for disease-modifying treatment in chronic or severe CTS cases is carpal tunnel surgery to change the shape of the carpal tunnel. The American Academy of Orthopedic Surgeons recommends proceeding conservatively with a course of nonsurgical therapies tried before release surgery is considered. A different treatment should be tried if the current treatment fails to resolve the symptoms within 2 to 7 weeks. Early surgery with carpal tunnel release is indicated where there is evidence of median nerve denervation or a person elects to proceed directly to surgical treatment. Recommendations may differ when carpal tunnel syndrome is found in association with the following conditions: diabetes mellitus, coexistent cervical radiculopathy, hypothyroidism, polyneuropathy, pregnancy, rheumatoid arthritis, and carpal tunnel syndrome in the workplace. CTS related to another pathophysiology is addressed by treating that pathology.
Sources: en.wikipedia.org
== History == EcPLA was first described in the scientific literature by a team that included Adam Halberstadt, Alexander Stratford, Jason Wallach, and David E. Nichols in 2019. It was developed by Lizard Labs. The drug was encountered online as a novel designer drug in around 2020 and became more widely available in early 2022.
== In popular culture == In Monty Python's Life of Brian (1979), some people mishear parts of the Sermon on the Mount's beatitudes, including "Blessed are the cheesemakers" rather than "Blessed are the peacemakers" (Matthew 5:9). Cheesemaking has served as the theme of several fictional works and games. This includes Fromage, a 2024 strategy board game.
=== Australia === Pizza Hut expanded to Australia in 1970, opening its first dine-in restaurant in Belfield in April 1970. In September 2016, private equity firm Allegro Funds and a local management team bought the master franchise agreement for Pizza Hut in Australia from Yum! Brands. In November 2016, Pizza Hut acquired Australian pizza chain Eagle Boys. Half of the Eagle Boys stores were converted to Pizza Hut stores by Christmas 2016 while the remainder were converted by April 2017. In June 2023, Allegro sold Pizza Hut Australia to US franchise operator Flynn Restaurant Group. As of June 2023, there are about 260 Pizza Hut stores in Australia. In May 2024, Australian franchisee Pizza Pan Group was penalized with a AU$2.5 million fine for sending 10 million marketing spam messages over four months in violation of Australian spam laws. It had been directed to report regularly to the Australian Communications and Media Authority.
Mephedrone acts as a potent substrate for monoamine transporters, including the dopamine transporter (DAT), serotonin transporter (SERT), and norepinephrine transporter (NET). It inhibits the reuptake of these neurotransmitters and promotes their release. The drug induces a rapid and significant increase in extracellular levels of dopamine, serotonin, and norepinephrine. This effect is more pronounced for serotonin compared to dopamine, which distinguishes mephedrone from much of the other psychostimulants. The pharmacodynamic profile of mephedrone is often compared to MDMA and methamphetamine. Like MDMA, it has a greater effect on serotonin than dopamine release. Similar to methamphetamine, it causes rapid dopamine release. Mephedrone has been found to be a full releaser of serotonin but a partial releaser of dopamine. In addition to induction of monoamine release via the monoamine transporters, mephedrone shows significant affinity for various receptors, including the serotonin 5-HT2A, 5-HT2B, 5-HT2C, and α2-adrenergic receptors, as well as the trace amine-associated receptor 1 (TAAR1). Mephedrone is a potent and near-full agonist of the serotonin 5-HT2A receptor, whereas it was inactive as an agonist of the serotonin 5-HT2B receptor. Mephedrone binds to and activates the rat and mouse TAAR1 with micromolar potencies, but is not an agonist of the human TAAR1 (EC50Tooltip half-maximal effective concentration > 30 μM).
=== Discovery === Darmstadtium was first discovered on November 9, 1994, at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung, GSI) in Darmstadt, Germany, by Peter Armbruster and Gottfried Münzenberg, under the direction of Sigurd Hofmann. The team bombarded a lead-208 target with accelerated nuclei of nickel-62 in a heavy ion accelerator and detected a single atom of the isotope darmstadtium-269:
Sources: en.wikipedia.org
Many drivers have blood levels far exceeding the therapeutic dose range and often in combination with alcohol, illegal, or addictive prescription drugs, suggesting a high degree of potential for non-medical use of benzodiazepines, zolpidem, and zopiclone. Zopiclone, which at prescribed doses causes moderate impairment the next day, has been estimated to increase the risk of vehicle accidents by 50%, causing an increase of 503 excess accidents per 100,000 persons. Zaleplon or other nonimpairing sleep aids were recommended be used instead of zopiclone to reduce traffic accidents. Zopiclone, as with other hypnotic drugs, is sometimes used to carry out criminal acts such as sexual assaults. Zopiclone has crosstolerance with barbiturates and is able to suppress barbiturate withdrawal symptoms. It is frequently self-administered intravenously in studies on monkeys, suggesting a high risk of addictive potential. Zopiclone is in the top ten medications obtained using a false prescription in France.
==== Blood pressure ==== In the short term, nicotine causes a transient increase in blood pressure. Long term, epidemiological studies generally show increased blood pressure and hypertension among nicotine users.
Film laboratories or darkrooms Clandestine labs for the production of illegal drugs Computer labs Crime labs used to process crime scene evidence Language labs Medical labs (involves handling of chemical compounds) Public health labs Cleanrooms
Using various modifiers, the activity of the enzyme can be regulated, enabling control of the biochemistry of the cell as a whole. The structure of proteins is traditionally described in a hierarchy of four levels. The primary structure of a protein consists of its linear sequence of amino acids; for instance, "alanine-glycine-tryptophan-serine-glutamate-asparagine-glycine-lysine-...". Secondary structure is concerned with local morphology (morphology being the study of structure). Some combinations of amino acids will tend to curl up in a coil called an α-helix or into a sheet called a β-sheet; some α-helixes can be seen in the hemoglobin schematic above. Tertiary structure is the entire three-dimensional shape of the protein. This shape is determined by the sequence of amino acids. In fact, a single change can change the entire structure. For example, the beta chain of hemoglobin contains 146 amino acid residues; substitution of the glutamate residue at position 6 with a valine residue changes the behavior of hemoglobin so much that it results in sickle-cell disease. Finally, quaternary structure is how separately polypeptide chains interact with one another to form the final protein. This applies only to proteins composed of multiple chains, such as hemoglobin with its four subunits, whereas many others have only one chain.
Sources: en.wikipedia.org
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.
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.
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.
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.