Everything below concerns research chemical. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-07-30. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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 |
|---|---|---|
| Appearance | White to off-white solid | Typical form of reference material |
| Solubility | Low in water; soluble in DMSO | Used to prepare stock solutions |
| Typical storage | -20 °C, desiccated, protected from light | Common laboratory practice |
| Analytical method | LC-MS/MS | Detects parent compound and metabolites |
| Common test matrix | Urine or blood | Used in anti-doping analysis |
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.
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.
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.
== Geography == The boundaries formed in the 12th century were not changed substantially over the county's existence. There are four English historic counties and two Scottish counties that it borders: Northumberland and County Durham to the east; Westmorland to the south, the Furness part of Lancashire to the southwest; Dumfriesshire to the north and Roxburghshire to the northeast. To the west the county is bounded by the Solway Firth and the Irish Sea. The northern boundary is formed by the Solway Estuary and the border with Scotland running east to Scotch Knowe at Kershope Burn. The boundary runs south from Scotch Knowe along the Cheviot Hills, then followed a tributary of the River Irthing and crossed Denton Fell to the River Tees. From Tees Head the boundary crosses the Pennines to descend Crowdundale Beck, from where it followed the rivers Eden and Eamont to the centre of Ullswater. The line follows Glencoin Beck to the top of Helvellyn ridge at Wrynose Pass and along the River Duddon (near Millom) to the sea . The highest point of the county is Scafell Pike, at 3,208 feet (978 m), the highest mountain in England. Carlisle is the county town.
More recent evidence suggests that estrogen promotes cholestasis via its metabolite estradiol-17-β-D-glucuronide (E2). E2 secreted into the canaliculi by MRP2 was found to repress the transcription of bile salt export pump (BSEP), the apical ABC transporter responsible for exporting monoanionic conjugated bile acids from hepatocytes into bile canaliculi. E2 was also found to upregulate miR-148a, which represses expression of the pregnane X receptor (PXR). PXR is a nuclear receptor in hepatocytes that senses intracellular bile acid concentrations and regulates gene expression accordingly to increase bile efflux. Genetic predisposition for ICP is suggested by familial and regional clustering of cases. Several studies have implicated heterozygous mutations of the genes ABCB11 and ABCB4 in ICP, which respectively encode the canalicular transport proteins BSEP and multidrug resistance protein 3 (MDR3). MDR3 is responsible for exporting phosphatidylcholine, the major lipid component of bile, into bile canaliculi where it forms micelles with bile salts to prevent the latter from damaging luminal epithelium. Bile flow requires canalicular secretion of both bile salts and phosphatidylcholine. MDR3 mutations are an established predisposing factor, found in 16% of ICP cases. More recently, studies have demonstrated involvement of BSEP mutations in at least 5% of cases. The V444A polymorphism of ABCB11 in particular may lead to ICP by causing a reduction in hepatic BSEP expression and consequently decreased bile salt export.
This article incorporates text by Laura J. Cobb, Changhan Lee, Jialin Xiao, Kelvin Yen, Richard G. Wong, Hiromi K. Nakamura, Hemal H. Mehta, Qinglei Gao, Carmel Ashur, Derek M. Huffman, Junxiang Wan, Radhika Muzumdar, Nir Barzilai, and Pinchas Cohen2 available under the CC BY 4.0 license.
==== Antarctica ==== In 1982, Mahathir discussed the governance of Antarctica at the United Nations Convention on the Law of the Sea (UNCLOS). He emphasized that Antarctica should be regarded as the common heritage of mankind, opposing any unilateral claims of sovereignty and advocating for international cooperation in its management and resource utilization. At the time, there were concerns that minerals could be exploited in Antarctica, and the media regarded Mahathir's stance as the only political challenge ever mounted to the Antarctic Treaty in decades. In 1984, Mahathir stated that while the Antarctic Treaty system had contributed positively, there was a need to establish a broader foundation for international cooperation in Antarctica, and he proposed the formation of a "special committee on Antarctica" to conduct an in-depth study and build consensus on a new administrative framework for the continent and the mechanisms required to achieve it. Later, in October 1999, Malaysia sent four scientists to Antarctica to conduct research, focusing on air pollution as part of Universiti Malaya's air pollution research unit. Then, in November 2001, Malaysia launched a second mission, sending two scientists from Universiti Malaya to conduct research on marine and biological sciences. In February 2002, Mahathir led a Malaysian delegation, including his wife, Siti Hasmah Mohamad Ali, and several cabinet members, on a visit to Antarctica. They travelled from Ushuaia, Argentina, aboard the Russian icebreaker Kapitan Dranitsyn.
Sources: en.wikipedia.org
Protriptyline, sold under the brand name Vivactil among others, is a tricyclic antidepressant (TCA), specifically a secondary amine. Uniquely among most of the TCAs, protriptyline tends to be energizing instead of sedating, and is sometimes used for narcolepsy to achieve a wakefulness-promoting effect. TCAs including protriptyline are also used to reduce the incidence of recurring headaches such as migraine, and for other types of chronic pain.
== Predicted properties == Other than nuclear properties, no properties of meitnerium or its compounds have been measured; this is due to its extremely limited and expensive production and the fact that meitnerium and its parents decay very quickly. Properties of meitnerium metal remain unknown and only predictions are available.
By the late 1930s, Thomas was embraced as the "poetic herald" for a group of English poets, the New Apocalyptics. Thomas refused to align himself with them and declined to sign their manifesto. He later stated that he believed they were "intellectual muckpots leaning on a theory". Despite this, many of the group, including Henry Treece, modelled their work on Thomas's. In the politically charged atmosphere of the 1930s Thomas's sympathies were very much with the radical left, to the point of his holding close links with the communists; he was also decidedly pacifist and anti-fascist. He was a supporter of the left-wing No More War Movement and boasted about participating in demonstrations against the British Union of Fascists. Bert Trick has provided an extensive account of an Oswald Mosley rally in the Plaza cinema in Swansea in July 1933 that he and Thomas attended.
=== Garret: The King of Tustin === First aired: Online Robert and Kyle have one major problem: Garrett. This self-proclaimed King of Tustin makes their lives miserable. The Queen of Tustin is crowned, courtesy of MMA Middleweight Jake Shields.
Biocatalyzed kinetic resolution is utilized extensively in the purification of racemic mixtures of synthetic amino acids. Many popular amino acid synthesis routes, such as the Strecker Synthesis, result in a mixture of R and S enantiomers. This mixture can be purified by (I) acylating the amine using an anhydride and then (II) selectively deacylating only the L enantiomer using hog kidney acylase. These enzymes are typically extremely selective for one enantiomer leading to very large differences in rate, allowing for selective deacylation. Finally the two products are now separable by classical techniques, such as chromatography.
Sources: en.wikipedia.org
Anti-doping and clinical laboratories commonly use liquid chromatography-tandem mass spectrometry. The method can identify GW501516 and its metabolites in urine or blood. Detection depends on sample timing and the amount present.
PPARδ is a nuclear receptor that regulates genes linked to fatty acid oxidation and energy metabolism. Activation can alter lipid handling and energy use in experimental models. The full range of effects in humans is still under study.
The solid compound is generally stable when kept cold, dry, and protected from light. Solutions may degrade faster, so laboratory protocols often specify fresh preparation or cold storage. Stability can depend on solvent, concentration, and container.
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.