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 2026-06-23 and is reviewed periodically as new material appears.
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.
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.
A common misconception is that cardarine has been proven safe for human use. In reality, human clinical data are limited, and long-term animal studies have raised concerns about cancer. Another misconception is that it is a supplement or vitamin-like compound. It is a synthetic research chemical with no approved medical indication. Scientific discussion often focuses on its mechanism and detection rather than therapeutic use. Regulatory and anti-doping literature treats it primarily as a prohibited substance.
Cardarine is explicitly prohibited by the World Anti-Doping Agency under the class of PPARδ agonists. Its presence in urine or blood samples can be detected using mass spectrometry-based methods, often liquid chromatography-tandem mass spectrometry. Athletes who test positive may face sanctions, including bans from competition. The compound is also regulated as a prescription-only or unapproved drug in many countries. Enforcement varies by jurisdiction, and some regions treat it as a controlled substance. Online sales may occur despite these restrictions, creating quality and legal risks.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a metabolic modulator. |
| Approved medical use | None in major jurisdictions | Not a registered drug. |
| Common test matrix | Urine | Most anti-doping samples use urine. |
| Typical detection method | LC-MS/MS | Detects parent compound and metabolites. |
| Reference standard storage | -20 °C, desiccated | Typical for analytical standards. |
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.
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.
Cardarine is a common name for GW501516, an investigational compound developed in the 1990s for metabolic conditions. It acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in lipid and energy metabolism. The compound is frequently mislabeled as a selective androgen receptor modulator, or SARM, but its molecular target is different. GW501516 reached early clinical testing before development was discontinued. It has no approved therapeutic use in any country. The name cardarine is not a formal international nonproprietary name.
Regulatory treatment varies, but cardarine is not approved as a medicine. Sports authorities list GW501516 as a prohibited substance, and it is banned at all times under the World Anti-Doping Agency code. Many countries restrict sales for human consumption, while online vendors market it as a research chemical. Such products may lack purity data, and their actual contents can differ from the label. Purchasing or possessing cardarine may carry legal consequences depending on jurisdiction. The compound is not a dietary supplement ingredient in regulated markets.
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.
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.
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
Laboratory studies have examined GW501516 in cell cultures and rodents for conditions such as dyslipidemia, insulin resistance, and obesity. Some trials in humans were initiated, but development was discontinued after preclinical findings raised concerns about cancer in certain models. Those findings do not prove that the compound causes cancer in people, but they contributed to regulatory caution. Later reviews often describe the evidence as preliminary and insufficient for assessing long-term safety.
== Potency == Index inducer or just inducer predictably induce metabolism via a given pathway and are commonly used in prospective clinical drug-drug interaction studies. Strong, moderate, and weak inducers are drugs that decreases the AUC of sensitive index substrates of a given metabolic pathway by ≥80%, ≥50% to <80%, and ≥20% to <50%, respectively.
{\displaystyle {\begin{array}{l}{}\\{\ce {^{6}_{4}Be->[5\ {\ce {zs}}]{^{4}_{2}He}+{2_{1}^{1}H}}}\\{\ce {{^{7}_{4}Be}+e^{-}->[53.22\ {\ce {d}}]{^{7}_{3}Li}}}\\{\ce {^{8}_{4}Be->[81.9\ {\ce {as}}]{2_{2}^{4}He}}}\\{\ce {^{10}_{4}Be->[1.387\ {\ce {Ma}}]{^{10}_{5}B}+e^{-}}}\\{\ce {^{11}_{4}Be->[13.76\ {\ce {s}}]{^{11}_{5}B}+e^{-}}}\\{\ce {^{11}_{4}Be->[13.76\ {\ce {s}}]{^{7}_{3}Li}+{^{4}_{2}He}+e^{-}}}\\{\ce {^{12}_{4}Be->[21.46\ {\ce {ms}}]{^{12}_{5}B}+e^{-}}}\\{\ce {^{12}_{4}Be->[21.46\ {\ce {ms}}]{^{11}_{5}B}+{^{1}_{0}n}+e^{-}}}\\{\ce {^{13}_{4}Be->[1\ {\ce {zs}}]{^{12}_{4}Be}+{^{1}_{0}n}}}\\{\ce {^{14}_{4}Be->[4.53\ {\ce {ms}}]{^{13}_{5}B}+{^{1}_{0}n}+e^{-}}}\\{\ce {^{14}_{4}Be->[4.53\ {\ce {ms}}]{^{14}_{5}B}+e^{-}}}\\{\ce {^{14}_{4}Be->[4.53\ {\ce {ms}}]{^{12}_{5}B}+{2_{0}^{1}n}+e^{-}}}\\{\ce {^{15}_{4}Be->[790\ {\ce {ys}}]{^{14}_{4}Be}+{^{1}_{0}n}}}\\{}{\ce {^{16}_{4}Be->[650\ {\ce {ys}}]{^{14}_{4}Be}+{2_{0}^{1}n}}}\\{}\end{array}}}
In early 1936, Thomas met Caitlin Macnamara (1913–1994), a 22-year-old dancer of Irish and French Quaker descent. She had run away from home, intent on making a career in dance, and aged 18 joined the chorus line at the London Palladium. Introduced by Augustus John, Caitlin's lover, they met in The Wheatsheaf pub on Rathbone Place in London's West End. Laying his head in her lap, a drunken Thomas proposed. Thomas liked to assert that he and Caitlin were in bed together ten minutes after they first met. Although Caitlin initially continued her relationship with John, she and Thomas began a correspondence, and in the second half of 1936 were courting. They married at the register office in Penzance, Cornwall, on 11 July 1937. For the first months of their relationship and marriage the couple lived at the Macnamara family home in Blashford, Hampshire. In May 1938 they moved to Wales, to the village of Laugharne, Carmarthenshire where they rented a cottage in Gosport Street before moving into 'Sea View', a larger property, a couple of months later. They left Laugharne in July 1940 and then led a peripatetic lifestyle over the next few years, returning to Blashford and subsequently living at Marshfield (1940), Bishopston (1940–41), Chelsea, in London (1942–43), Talsarn (1942–44), East Knoyle, Beaconsfield (1944), Bosham, Sussex (1944), Blaencwm (Llansteffan) (1944 and 1945), New Quay (1944–45), and in premises arranged by Margaret Taylor, one of Dylan's benefactors (the wife of the historian A. J. P.
=== Christian: The Angry Couch Potato === First aired 5 April 2009 Mayhem helps out Cameron and Brian, by dropping Conor "Hurricane" Heun in the cage with Christian, a lazy, couch potato with a thirst for the pain of others.
In enzymology, L-threonine 3-dehydrogenase (EC 1.1.1.103), or just threonine dehydrogenase, is an enzyme that participates in the process of breaking down threonine in certain non-human organisms like mice. In particular, it catalyzes the chemical reaction
Sources: en.wikipedia.org
=== Effects === ACE inhibitors block the conversion of angiotensin I (ATI) to angiotensin II (ATII). Arteriolar resistance is lowered, venous capacity is increased; cardiac output, cardiac index, stroke work, and volume is lowered; resistance in renal blood vessels is lowered; and lead to increased natriuresis (excretion of sodium in the urine). Bradykinin levels increase because angiotensin-converting enzyme also degrades bradykinin, and its inhibition reduces bradykinin inactivation. Under normal conditions, angiotensin II has these effects:
Studies suggest that smoking decreases appetite, but did not conclude that overweight people should smoke or that their health would improve by smoking, because this habit is a cause of heart disease. Smoking also decreases weight by overexpressing the gene AZGP1, which stimulates lipolysis. Smoking causes about 10% of the global burden of fire deaths, and smokers are placed at an increased risk of injury-related deaths in general, partly due to also experiencing an increased risk of dying in a motor vehicle crash. Smoking increases the risk of symptoms associated with Crohn's disease (a dose-dependent effect with use of greater than 15 cigarettes per day). There is some evidence for decreased rates of endometriosis in infertile smoking women, although other studies have found that smoking increases the risk in infertile women. There is little or no evidence of a protective effect in fertile women. Some preliminary data from 1996 suggested a reduced incidence of uterine fibroids, but overall the evidence is unconvincing. Current research shows that tobacco smokers who are exposed to residential radon are twice as likely to develop lung cancer as non-smokers. As well, the risk of developing lung cancer from asbestos exposure is twice as likely for smokers than for non-smokers. New research has found that women who smoke are at significantly increased risk of developing an abdominal aortic aneurysm, a condition in which a weak area of the abdominal aorta expands or bulges, and is the most common form of aortic aneurysm.
== Structure == ATP consists of three parts: a sugar, an amine base, and a phosphate group. More specifically, ATP consists of an adenine attached by the #9-nitrogen atom to the 1′ carbon atom of a sugar (ribose), which in turn is attached at the 5' carbon atom of the sugar to a triphosphate group. In its many reactions related to metabolism, the adenine and sugar groups remain unchanged, but the triphosphate is converted to di- and monophosphate, giving respectively the derivatives ADP and AMP. The three phosphoryl groups are labeled as alpha (α), beta (β), and, for the terminal phosphate, gamma (γ). In neutral solution, ionized ATP exists mostly as ATP4−, with a small proportion of ATP3−.
After this change, only the larger engine with lean-burn technology was available in the home market, now with 72 PS (53 kW; 71 hp) (JIS gross) and labelled Familia Presto 1300AP (for "Anti Pollution").
Sources: en.wikipedia.org
β-Carbolines and harmala alkaloids like harmine and harmaline contain DMT's close analogue NMT embedded in their structures. Triptans like sumatriptan, rizatriptan, eletriptan, almotriptan, frovatriptan, and zolmitriptan, which are antimigraine agents, all contain DMT in their structures. Similarly, the pertine antipsychotics including alpertine, milipertine, oxypertine, and solypertine are DMT derivatives. Bioisosteres of DMT in which the indole ring system has been replaced with a different ring system include isoDMT (an isoindole or isotryptamine), 2ZEDMA (an indolizine), and C-DMT (an indene), among others. The homologues of DMT in which the alkyl side chain has been shortened or lengthened by one carbon atom are gramine and dimethylhomotryptamine (DMHT), respectively. Further-extended homologues are also known. Deuterated isotopologues of DMT include deudimethyltryptamine (DMT-d10) or CYB004 (HLP004), SPL028 (D2-DMT; α,α-dideutero-DMT), and DMT-d4 (α,α,β,β-tetradeutero-DMT). Prodrugs of DMT such as 1-benzoyl-DMT and N-phosphonooxymethyl-DMT (N-POM-DMT) have also been described. Many of DMT's analogues and derivatives are serotonin receptor modulators and/or serotonergic psychedelics similarly to DMT itself.
=== 2006 === 13 March Beating Bird Flu, the May 1997 Hong Kong outbreak of H5N1 bird flu; Dutch virologist Ab Osterhaus at Erasmus MC in Rotterdam thought that the flu outbreak came from poultry markets; in January 2004 another bigger outbreak, 34 caught the virus but 25 died; Neil Ferguson of Imperial College; virologist John Oxford of the Royal London Hospital; virologist Chris Smith (The Naked Scientists) of the University of Cambridge; Alan Hay of the National Institute of Health Research; James Niven in Manchester in 1919, and the death rate was highest from ages 25 to 34; cyanosis occurred; historian Douglas Gill, and the British Army transit camp at Étaples, a possible source of the outbreak, where purulent bronchitis started in December 1916; the Armed Forces Institute of Pathology, where pathologist Jeffery Taubenberger sequenced the 1919 virus, which affected hemagglutinin receptors; the virus DNA had eight genes, which made ten proteins; virologist Terrence Tumpey at CDC Atlanta, who tested the 1919 virus on laboratory mice, where he found that neuraminidase helped the virus propagate; in the 1919 virus; the immune system could not recognise the 1919 virus sufficiently, and a cytokine storm occurred, which paradoxically happened most with people with the best immune systems, not older people; Neil Ferguson believed that a world pandemic would take two to three months to spread around the world, and would take 50 days to reach a peak in the UK, with one million cases per day.
== Centers and Institutes for Advanced Research & Education == Center for Advanced Photonics Research Center for Biophysics and Computational Biology Center for Computational Genetics and Genomics Center for Data Analytics and Biomedical Informatics Center for Materials Theory Institute for Computational Molecular Science Sbarro Health Research Organization
Sources: en.wikipedia.org
Legal status varies by country, but cardarine is not approved as a medicine in major jurisdictions. It is often sold as a research chemical, a category that may not be lawful for human use. Buyers should check local laws and product labels carefully.
Anti-doping laboratories use LC-MS/MS to detect GW501516 and its metabolites, usually in urine. The method can identify the parent compound at low concentrations. Detection windows vary with dose and individual factors.
No, cardarine has no approved medical uses in major jurisdictions. Early research explored metabolic conditions, but those programs were discontinued. It is not a registered treatment for any disease.
Yes, WADA prohibits cardarine as a PPARδ agonist. It appears on the prohibited list and can be detected in urine or blood. Athletes using it risk sanctions.