PPARδ agonist is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2025-08-29. Numbers and descriptions here follow the published literature rather than marketing material.
Anti-doping laboratories identify GW501516 and related metabolites using liquid chromatography coupled with tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be analyzed. The method targets the parent compound and phase I and phase II metabolites, which extend the detection window. Because the substance is prohibited at all times, athletes can be tested outside competition. Detection limits and windows depend on the assay, sample type, and individual metabolism.
Cardarine is frequently described as a fat-burning or endurance-enhancing supplement, but these claims exceed the available evidence. The compound is not a hormone, steroid, or selective androgen receptor modulator. Research articles discuss it as a tool compound for studying PPARδ biology, while anti-doping literature focuses on its abuse and detection. Quality of unapproved products is uncertain, and independent analyses have found impurities or incorrect labeling. Open questions include whether human cancer risk resembles that seen in rodents and how often non-athletes use the substance.
Cardarine is a common name for GW501516, also GW-1516, a synthetic compound developed as a peroxisome proliferator-activated receptor delta (PPARδ) agonist. It belongs to a class of agents that modulate gene transcription related to lipid and energy metabolism. The compound was studied in preclinical and early clinical research for metabolic and cardiovascular conditions, but it did not progress to approved therapeutic use. Its name appears in fitness and sports contexts despite not being approved as a drug.
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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport; not approved as medicine | Listed by WADA at all times. |
| Common synonyms | GW501516, GW-501516, endurobol | Cardarine is a colloquial name. |
| Typical analytical method | LC-MS/MS | Detects parent compound and metabolites. |
| Common test matrix | Urine | Blood and dried blood spots also possible. |
| Legal classification | Varies by country | Often treated as unapproved drug or research chemical. |
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.
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.
==== Risk of an oil spill ==== The FSO Safer, a floating oil storage and offloading tanker moored off Yemen’s Red Sea coast and holding around 1.1 million barrels of oil, has become a major humanitarian concern for the country. Since 2015, the vessel has not received proper maintenance, and experts have warned that corrosion or technical failure could lead to a large spill. Modelling exercises suggest that a serious spill could force the closure of major Red Sea ports such as Hudaydah and Salif, with the port of Aden possibly also affected in the Gulf of Aden. Such a scenario would cause an interruption of food assistance and a dramatically acute fuel shortage, among other consequences, and worsen the already severe humanitarian challenges the country is facing.
This "conversion" is called saccharification which occurs between the temperatures 60–70 °C (140–158 °F). The result of the mashing process is a sugar-rich liquid or "wort", which is then strained through the bottom of the mash tun in a process known as lautering. Prior to lautering, the mash temperature may be raised to about 75–78 °C (167–172 °F) (known as a mashout) to free up more starch and reduce mash viscosity. Additional water may be sprinkled on the grains to extract additional sugars (a process known as sparging). The wort is moved into a large tank known as a "copper" or kettle where it is boiled with hops and sometimes other ingredients such as herbs or sugars. This stage is where many chemical reactions take place, and where important decisions about the flavour, colour, and aroma of the beer are made. The boiling process serves to terminate enzymatic processes, precipitate proteins, isomerise hop resins, and concentrate and sterilise the wort. Hops add flavour, aroma and bitterness to the beer. At the end of the boil, the hopped wort settles to clarify in a vessel called a "whirlpool", where the more solid particles in the wort are separated out. After the whirlpool, the wort is drawn away from the compacted hop trub, and rapidly cooled via a heat exchanger to a temperature where yeast can be added. A variety of heat exchanger designs are used in breweries, with the most common a plate-style. Water or glycol run in channels in the opposite direction of the wort, causing a rapid drop in temperature.
=== Farmer equity practices === Starbucks began drafting plans for corporate social responsibility in 1994. Since Starbucks has partnered with Conservation International (CI) to draft plans and audit its coffee and farmer equity (C.A.F.E.) program, Starbucks's C.A.F.E. practices are based on a rating system of 249 indicators. Farmers who earn high overall scores receive higher prices than those who achieve lower scores. Ratings categories include economic accountability, social responsibility, environmental leadership in coffee growing and processing. Indicators for social responsibility have evolved and now include 'zero tolerance' indicators that require workers to be paid in cash, check, or direct deposit, ensure that all workers are paid the established minimum wage, that workplaces are free of harassment and abuse, that workplaces are nondiscriminatory and do not employ persons under the age of 14, and several more. Starbucks has moved 90% of its coffee purchases to preferred C.A.F.E. certified providers, and the company is approaching its stated goal to purchase 100% of its coffee through C.A.F.E. or other 'ethically sourced' certification systems. Washington State University Assistant Professor Daniel Jaffee argues that Starbucks's C.A.F.E. practices merely 'green wash' "to burnish their corporate image".
Sources: en.wikipedia.org
Because isotopes differ in mass from each other by a nearly integer amount of Da, the many isotopic peaks tend to group into so-called isotopometric clusters in a mass spectrum, with each cluster smearing into one peak. For large molecules, this most abundant peak may be different from the monoisotopic peak, and can be calculated using either a full prediction of all peaks (using the natural abundances) or approximately to integer precision using pre-calculated tables derived from a binomial distribution.
=== Cardiovascular === Like other NSAIDs, its use is associated with an increased risk of cardiovascular events such as heart attack and stroke. Although meloxicam inhibits formation of thromboxane A, it does not appear to do so at levels that would interfere with platelet function. A pooled analysis of randomized, controlled studies of meloxicam therapy of up to 60 days duration found that meloxicam was associated with a statistically significantly lower number of thromboembolic complications than the NSAID diclofenac (0.2% versus 0.8% respectively) but a similar incidence of thromboembolic events to naproxen and piroxicam. People with hypertension, high cholesterol, or diabetes are at risk for cardiovascular side effects. People with family history of heart disease, heart attack, or stroke should tell their treating physician as the potential for serious cardiovascular side effects is significant.
=== June === 6 June MPs vote to suspend Margaret Ferrier, the MP for Rutherglen and Hamilton West, from the House of Commons for 30 days for breaching COVID-19 regulations, almost certainly triggering a by-election in her constituency. Kevin Stewart resigns as Minister for Transport after experiencing poor mental health. 7 June – Circular Economy Minister Lorna Slater confirms that Scotland's Deposit Return Scheme is to be delayed until at least October 2025, meaning it will launch at a similar time to similar projects in other parts of the UK. 8 June – Members of the National Union of Rail, Maritime and Transport Workers at ScotRail vote to accept a 5% pay increase for 2023–24. 11 June – Police Scotland arrest former First Minister Nicola Sturgeon as part of their ongoing investigation into the SNP's finances. She is subsequently released without charge. 12 June – First Minister Humza Yousaf tells BBC News he will not suspend Nicola Sturgeon from the SNP following her arrest. 13 June BMA Scotland announces that junior doctors have rejected a 14.5% pay offer from the Scottish Government and will stage a 72-hour strike from 12 to 15 July. Màiri McAllan, Scotland's Cabinet Secretary for Net Zero and Just Transition, is additionally appointed as Minister for Transport, replacing Kevin Stewart in the role. 14 June – Jo Farrell, the current Chief Constable of Durham Constabulary, is appointed as Police Scotland's first female Chief Constable; she will replace Sir Iain Livingstone, who retires in August.
Sources: en.wikipedia.org
== Changes during ontogeny == In the rat blood plasma, the GPx-3 activity is low during the first two weeks after birth and rapidly increasing during transition from milk nutrition to solid food. Aging is accompanied by decrease in GPx-3 activity: in the blood plasma of rats it occurs around 23-26 months of age.
Sodium oxybate has also been investigated and been of interest to improve sleep and associated symptoms in other conditions with sleep disruption, such as myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and long COVID, which also have high rates of non-restorative sleep. In addition, sodium oxybate was limitedly studied to improve insomnia in people with depression or bipolar disorder. However, it was reported to paradoxically disrupt sleep and induce narcolepsy-like changes in these individuals. Moreover, concerns about misuse have limited use of sodium oxybate for other medical conditions. GHB has also garnered a reputation as a date-rape drug, although the actual prevalence of this appears to be much lower than popular perception. The GABAB receptor agonist baclofen has also been more limitedly investigated for improvement of sleep and has been found to be effective in enhancing sleep similarly to sodium oxybate. However, in people with narcolepsy, baclofen and sodium oxybate both improved sleep but only sodium oxybate reduced daytime sleepiness. In any case, research in this area is limited, and there remains significant interest in baclofen in the potential treatment of sleeping problems. Unlike sodium oxybate, baclofen is not a controlled substance and has much less or no misuse potential. Baclofen and sodium oxybate have been found to activate the GABAB receptor differently, which is thought to underlie the differences in their effects.
==== Megastigmatrienone ==== Tobacco aroma is due to the presence of different volatile compounds; megastigmatrienone is the key flavor compound in tobacco. Megastigmatrienone is used as flavor in tobacco products as well. Megastigmatrienone, a cyclohexenone, and a carotenoid-derived aromatic compound, produces spice notes associated with wine. Megastigmatrienone is a metabolite of Brewer's yeast. Megastigmatrienone, as Tabanone, is manufactured by Symrise as a perfume ingredient.
=== Non-medical use === Combining a muscle relaxant like carisoprodol with opioids and benzodiazepines is known as "The Holy Trinity" as it has been reported to increase the power of the "high". Recreational users of carisoprodol usually seek its potentially heavy sedating, relaxant, and anxiolytic effects. Because of its potentiating effects on narcotics, it is often used in conjunction with opioids. Carisoprodol is not tested for on standard drug testing screens, although tests for it do exist. On 26 March 2010 the DEA issued a Notice of Hearing on a proposal for placing carisoprodol in schedule IV of the Controlled Substances Act, later confirming its classification under schedule IV. Carisoprodol is sometimes mixed with date rape drugs.
Sources: en.wikipedia.org
Legal status varies by country. It is not approved as a medicine, and it is prohibited in sport. Some jurisdictions restrict import, sale, or possession.
Laboratories use liquid chromatography-tandem mass spectrometry to detect GW501516 and its metabolites. Urine is commonly tested, and testing can occur in and out of competition.
No, cardarine is not a SARM. It is a PPARδ agonist, which acts on a different receptor. The two classes are often confused in online discussions.
Cardarine is commonly known as GW501516 or GW-1516. These names refer to the same synthetic compound. It is not a brand-name approved medicine.