Everything below concerns PPARδ agonist. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
Handling and quality assessment of cardarine reference material follow general laboratory practices for poorly characterized compounds. It typically appears as a white to off-white powder and is sparingly soluble in water but soluble in organic solvents such as dimethyl sulfoxide and ethanol. Storage recommendations usually specify a cool, dry, dark place, with long-term storage at low temperature and desiccation. Purity may be checked by high-performance liquid chromatography with ultraviolet detection, while identity is confirmed by mass spectrometry and nuclear magnetic resonance. No pharmacopeial monograph exists, so reported purity and stability depend on the supplier’s methods.
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
Detection of GW501516 in biological samples generally relies on liquid chromatography coupled with tandem mass spectrometry. Urine is a common matrix in anti-doping analysis, while blood or plasma may be used in research settings. Sample preparation can involve enzymatic hydrolysis, protein precipitation, or solid-phase extraction before instrumental analysis. Because the compound undergoes metabolism, assays may target the parent molecule, one or more metabolites, or both. Detection windows are not fixed; they depend on factors such as dose, route, individual metabolism, and assay sensitivity. Reference standards are required for accurate identification and quantification.
GW501516 acts on PPARδ, a nuclear receptor that helps regulate fatty acid oxidation and energy homeostasis. In animal studies, activation of this receptor was associated with increased endurance and changes in lipid metabolism. Human trials examined effects on blood lipids and other metabolic markers, but the compound did not advance to approval. Rodent studies later reported tumors in multiple tissues at doses used in those experiments. Whether those findings translate to human risk remains uncertain, and the clinical relevance of the animal data is still debated.
Regulatory bodies treat GW501516 as a prohibited substance in competitive sport. The World Anti-Doping Agency added it to the prohibited list, and it falls under classes covering metabolic modulators and hormone-related agents. It is not approved by drug regulators for human use, and it is not a lawful dietary supplement. Products sold under the cardarine name may contain unlisted ingredients or different compounds. Because no approved product exists, quality and identity are not guaranteed by pharmaceutical manufacturing standards.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual description for typical solid reference material. |
| Solubility | Poorly soluble in water; soluble in DMSO | Solubility depends on solvent, purity, and form. |
| Storage | Cool, dry, protected from light | Long-term storage often uses low temperature and desiccant. |
| Common analytical method | LC-MS/MS | Used for detection and quantification in biological matrices. |
| Common synonyms | GW-501516; GW501516; endurobol | Naming varies among literature, vendors, and databases. |
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
GW501516 acts as a ligand for PPAR delta, a nuclear receptor that regulates transcription of genes involved in fatty acid oxidation and energy use. Activation of this receptor in skeletal muscle shifts metabolism toward fat burning in animal models. The compound does not burn fat directly; it changes gene expression over hours to days. Researchers study it to understand metabolic flexibility and exercise adaptation. Effects observed in rodents are not automatically expected in humans.
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.
=== Laser === Argon laser trabeculoplasty (ALT) may be used to treat open-angle glaucoma, but this is a temporary solution, not a cure. A 50-μm argon laser spot is aimed at the trabecular meshwork to stimulate the opening of the mesh to allow more outflow of aqueous fluid. Usually, half of the angle is treated at a time. Traditional laser trabeculoplasty uses a thermal argon laser in an argon laser trabeculoplasty procedure. Nd:YAG laser peripheral iridotomy (LPI) may be used in patients susceptible to or affected by angle closure glaucoma or pigment dispersion syndrome. During laser iridotomy, laser energy is used to make a small, full-thickness opening in the iris to equalize the pressure between the front and back of the iris, thus correcting any abnormal bulging of the iris. In people with narrow angles, this can uncover the trabecular meshwork. In some cases of intermittent or short-term angle closure, this may lower the eye pressure. Laser iridotomy reduces the risk of developing an attack of acute angle closure. In most cases, it also reduces the risk of developing chronic angle closure or of adhesions of the iris to the trabecular meshwork. Computational fluid dynamics (CFD) simulations have shown that an optimal iridotomy size to relieve the pressure differential between the anterior and posterior side of the iris is around 0.1 mm to 0.2 mm. This coincides with clinical practice of LPI where an iridotomy size of 150 to 200 microns is commonly used. However, larger iridotomy sizes are sometimes necessary.
The first reference to Israel in non-biblical sources is found in the Merneptah Stele in c. 1209 BCE. The inscription is very brief and says: "Israel is laid waste and his seed is not". The inscription refers to a people, not an individual or nation state, who inhabit central Palestine or the highlands of Samaria. Some Egyptologists suggest that Israel appeared in earlier topographical reliefs, dating to the Eighteenth Dynasty or Nineteenth Dynasty (i.e. reign of Ramesses II) , but this reading remains controversial. In the Hebrew Bible, Israel first appears in Genesis 32:29, where an angel renames Jacob to Israel after Jacob fought with him. According to the folk etymology given in the text, Israel is derived from yisra, "to prevail over" or "to struggle with", and El, a Canaanite-Mesopotamian creator god that is tenuously identified with Yahweh. However, modern scholarship interprets El as the subject, "El rules/struggles", from sarar (שָׂרַר) 'to rule' (cognate with sar (שַׂר) 'ruler', Akkadian šarru 'ruler, king'), which is likely cognate with the similar root sara (שׂרה) "fought, strove, contended". Dr. Tzemah Yoreh clarifies that Israel is a combination of 'to strive with' (ש.ר.ה) and 'God' (אל) and that Jacob's name alternates between Jacob and Israel in the biblical narrative, even after his renaming, due to the authors having different opinions about Jacob's moral character. The gradual ethnonymic shift from "Israelites" to "Jews", regardless of their descent from Judah is made explicit in the Book of Esther (4th century BCE) of the Tanakh.
=== Leasing and sale of public lands === The law requires the leasing of at least 50% of public lands that private companies desire to lease for drilling, mining or logging. It cuts the royalties (the share of revenue) that the petroleum industry has had to pay for oil and gas extracted from public lands—costing taxpayers around $6 billion over a decade. It cuts the fee per acre that oil and gas companies have had to pay for initiating leasing of public lands. The law reinstates "noncompetitive leasing" of public lands for drilling, mining or logging that allows companies to purchase at a cheap price public lands that were not sold at auction. Over the next decade, the law requires four lease sales to oil and gas companies of lands inside Arctic National Wildlife Refuge, and six lease sales in the National Petroleum Reserve-Alaska along Alaska's northern coast. The law requires the Bureau of Land Management to hold quarterly onshore oil and gas lease sales.
In September 2022, NewsGuard Technologies reported that among the TikTok searches it had conducted and analyzed from the US, 19.4% surfaced misinformation such as questionable or harmful content about COVID-19 vaccines, homemade remedies, the 2020 US elections, the Russian invasion of Ukraine, the Robb Elementary School shooting, and abortion. NewsGuard suggested that in contrast, results from Google were of higher quality. Mashable's own test from Australia found innocuous results after searching for "getting my COVID vaccine" but suggestions such as "climate change is a myth" after typing in "climate change". In November 2023, Singaporean Law and Home Affairs Minister K. Shanmugam applied for court orders requiring TikTok to provide information on the identity of three users that he accuses of spreading false and defamatory information about him. The users had shared on TikTok an article published by celebscritic.com alleging that K. Shanmugam was involved in an extra-marital affair. According to an investigation published in September 2025 by Moldovan newspaper Ziarul de Gardă, before the 2025 Moldovan parliamentary election, hundreds of accounts with false identities were created to spread Russian propaganda in TikTok and Facebook. That month, Bloomberg reported, citing European officials and documents of undisclosed origin, that Russia had prepared a plan to interfere in the election, which would have included a disinformation campaign in both Romanian and Russian on Facebook, Telegram and TikTok.
Sources: en.wikipedia.org
Later, Justice Minister Aníbal Torres reassured the press that a question of confidence would not be used to defend Maraví. However, PM Bellido said that Torres' statement "is an opinion of the minister," and affirmed that using the question of confidence to defend Maraví wasn't ruled out. The press reported that Congress planned to wait until 7 October 2021, which was when a reinterpretation of the question of trust came into effect after having been approved on 17 September 2021. The reinterpretation would forbid the Prime Minister from raising the question of trust for constitutional reform bills and for issues that were the exclusive competence of the Congress of the Republic. According to sources consulted, the Congressional would claim that censuring ministers is a competence of the legislature in which the Government cannot intervene. Previously, Aníbal Torres criticized Congress' move to reinterpret the question of confidence, saying that it violated the balance of power established by the Constitution. Torres has stated that if Congress tries to promulgate the reinterpretation, then the Government will present an action of unconstitutionality. This case would be overseen by the Constitutional Court. It is worth noting that Congress has begun the election of new judges for the Constitutional Court. The mandate for the current Constitutional Court expired in 2019, but they kept serving as Congress couldn't agree on replacements. The Congressional opposition's attempt to impeach Iber Maraví was abruptly cut by the dissolution of the Bellido cabinet.
== Academic and professional career == Dawson has held several key positions at Scripps Research throughout his career. He began as an assistant professor in the Department of Cell Biology and later transitioned to the Department of Chemistry. In 2017, he was appointed as the Dean of Graduate and Postdoctoral Studie.
=== Central & East Indo-Pacific === 2024 Vietnamese export of pangasius maw has increased to about US$58,000,000, with 38% going to China and the rest to Thailand, Malaysia, Singapore and the USA. The Vietnam News Agency claims that the falling totoaba population has incentivized Chinese import of alternative maw. The island and seas of New Guinea see significant fish maw production. Since 2012, in and around the Kikori River delta of Papua New Guinea, the scaly croaker Nibea squamosa has been targeted in gillnetting for its extremely high-priced maw, selling for as much as US$15,615 per kilogram.
==== Noble and non-noble kava ==== Scholars make a distinction between the so-called noble and non-noble kava. The latter category comprises the so-called tudei (or "two-day") kavas, medicinal kavas, and wild kava (Piper wichmanii, the ancestor of domesticated Piper methysticum). Traditionally, only noble kavas have been used for regular consumption, due to their more favourable composition of kavalactones and other compounds that produce more pleasant effects and have lower potential for causing negative side effects, such as nausea, or "kava hangover". The perceived benefits of noble cultivars explain why only these cultivars were spread around the Pacific by Polynesian and Melanesian migrants, with presence of non-noble cultivars limited to the islands of Vanuatu, from which they originated. More recently, it has been suggested that the widespread use of tudei cultivars in the manufacturing of several kava products might have been the key factor contributing to the rare reports of adverse reactions to kava observed among the consumers of kava-based products in Europe. Tudei varieties have traditionally not been grown in Hawaii and Fiji, but in recent years there have been reports of farmers attempting to grow "isa" or "palisi" non-noble cultivars in Hawaii, and of imports of dried tudei kava into Fiji for further re-exporting. The tudei cultivars may be easier and cheaper to grow: while it takes up to 5 years for noble kava to mature, non-noble varieties can often be harvested just one year after being planted.
(death announced on this date) 14 October – Rosalind Howells, Baroness Howells of St Davids, 94, British politician, member of the House of Lords (1999–2019). 20 October – Oliver Colvile, 66, British politician, MP (2010–2017). 25 October – Dick Taverne, 97, British politician, MP (1962–1974) and member of the House of Lords (1996–2025). 3 November – John Marshall, 85, British politician, MEP (1979–1989) and MP (1987–1997). 11 November – Helen Newlove, Baroness Newlove, 63, British community reform activist, member of the House of Lords (since 2010). 16 November – Mark Fisher, 81, British politician, minister for the arts (1997–1998) and MP (1983–2010). 17 November – David Pryce-Jones, 89, British conservative commentator, author and historian. 27 November – Peter Whittle, 64, British politician, member of the London Assembly (2016–2021), cancer. 28 November – Sir John Stanley, 83, British politician, MP (1974–2015). 8 December – Kate Allsop, 71, British politician, mayor of Mansfield (2015–2019). (death announced on this date) 17 December – Sir Patrick McNair-Wilson, 96, English politician, MP (1964–1966, 1968–1997). (death announced on this date) 30 December – Joe Byrne, 72, Northern Ireland politician, MLA (1998–2003, 2011–2015). 31 December – Mary Bradley, 83, Northern Irish politician, MLA (2003–2011). (death announced on this date)
Sources: en.wikipedia.org
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.
Most methods use liquid chromatography with tandem mass spectrometry. Urine is common in anti-doping testing, and blood or plasma may be used in research.
Typical guidance is cool, dry, dark storage, often at low temperature and with desiccant. Stability data are limited, so storage conditions should be verified for each batch or supplier.
No. Cardarine is a PPARδ agonist, while selective androgen receptor modulators act on androgen receptors. The two classes differ in receptor target and downstream effects.