GW501516 raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-05-18 and is reviewed periodically as new material appears.
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.
Laboratory detection of cardarine typically involves sample preparation followed by chromatographic separation and mass spectrometric identification. Urine is the most common matrix for anti-doping tests, though blood and hair have also been explored. Methods can target the parent compound or its metabolites, depending on the expected window of detection. Reference standards are required for accurate quantification. Matrix effects and dilution can influence results, so laboratories use internal standards and validation protocols. The exact detection window varies with dose, route, and individual metabolism.
Quality assessment for cardarine samples usually combines identity, purity, and impurity testing. Nuclear magnetic resonance spectroscopy and mass spectrometry can confirm molecular structure, while high-performance liquid chromatography estimates purity. Certificates of analysis from testing laboratories may list these results, but they do not establish safety or legality. In the absence of approved manufacturing, products sold online may contain the wrong compound, variable amounts, or unlisted contaminants. Independent verification is therefore central to analytical work and to interpreting any reported biological activity.
Laboratory detection of GW501516 commonly uses liquid chromatography coupled with tandem mass spectrometry. The method can identify the parent compound or its metabolites in urine and blood after sample cleanup. Protein precipitation, solid-phase extraction, or enzymatic hydrolysis may precede analysis, depending on the matrix. Reference standards are required for accurate quantification and confirmation. Because the compound is not approved, testing often occurs in anti-doping, forensic, or research settings rather than routine clinical care. Results are reported with limits of detection and quantification.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a PPARδ agonist. |
| Typical detection matrix | Urine | Most common sample for anti-doping analysis. |
| Common analytical method | LC-MS/MS | Liquid chromatography-tandem mass spectrometry. |
| Common synonyms | GW501516, GSK-516, endurobol | Names found in research and fitness contexts. |
| Typical detection window | Variable | Depends on dose, route, and individual metabolism. |
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
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.
Clinical development stopped after rodent studies showed tumors at multiple sites. Whether those findings predict human cancer risk remains an open question, but they led sponsors to discontinue programs. Human safety data are limited to small, short-term studies that were not designed to assess cancer risk. Reported effects in those studies included changes in blood lipids, but the evidence is insufficient for medical use. Long-term consequences of nonmedical use are not well characterized. Questions about dose, duration, and individual susceptibility remain unresolved.
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.
==== SEC/IEC ==== Hydrophobic interactions in protein SEC are relatively weak at low ionic strength, electrostatic effects may contribute significantly to retention, and this allows us to use an SEC column as a weak ion exchanger.
== Disaccharide phosphorylases == Different biocatalytic approaches have been developed toward the synthesis of glycosides in past decades, for which glycosyltransferases and glycoside hydrolases are among the most common catalysts. The former often needs expensive materials and the latter often shows low yields. De Winter et al. investigated use of cellobiose phosphorylase (CP) toward synthesis of alpha-glycosides in ionic liquids. The best condition for use of CP was found to be in the presence of the ionic liquid AMMOENG 101 and ethyl acetate.
These two components, used together, allow a much finer degree of substance identification than either unit used separately. It is not possible to make an accurate identification of a particular molecule by gas chromatography or mass spectrometry alone. The mass spectrometry process normally requires a very pure sample while gas chromatography using a traditional detector (e.g. Flame ionization detector) cannot differentiate between multiple molecules that happen to take the same amount of time to travel through the column (i.e. have the same retention time), which results in two or more molecules that co-elute. Sometimes two different molecules can also have a similar pattern of ionized fragments in a mass spectrometer (mass spectrum). Combining the two processes reduces the possibility of error, as it is extremely unlikely that two different molecules will behave in the same way in both a gas chromatograph and a mass spectrometer. Therefore, when an identifying mass spectrum appears at a characteristic retention time in a GC–MS analysis, it typically increases certainty that the analyte of interest is in the sample.
When I woke up just after dawn on September 28, 1928, I certainly didn't plan to revolutionize all medicine by discovering the world's first antibiotic, or bacteria killer. But I suppose that was exactly what I did. He concluded that the mould was releasing a substance that was inhibiting bacterial growth, and he produced culture broth of the mould and subsequently concentrated the antibacterial component. After testing against different bacteria, he found that the mould could kill only specific, Gram-positive bacteria. For example, staphylococcus, streptococcus, and diphtheria bacillus (Corynebacterium diphtheriae) were easily killed; but there was no effect on typhoid bacterium (Salmonella typhimurium) and a bacterium once thought to cause influenza (Haemophilus influenzae). He prepared a large-culture method from which he could obtain large amounts of the mould juice. He called this juice "penicillin", explaining the reason as "to avoid the repetition of the rather cumbersome phrase 'Mould broth filtrate'." He invented the name on 7 March 1929. In his Nobel lecture he gave a further explanation, saying:
Schymanski, Emma L.; Jeon, Junho; Gulde, Rebekka; Fenner, Kathrin; Ruff, Matthias; Singer, Heinz P.; Hollender, Juliane (18 February 2014). "Identifying Small Molecules via High Resolution Mass Spectrometry: Communicating Confidence". Environmental Science & Technology. 48 (4): 2097–2098. Bibcode:2014EnST...48.2097S. doi:10.1021/es5002105. ISSN 0013-936X. PMID 24476540. Schymanski, Emma L.; Singer, Heinz P.; Slobodnik, Jaroslav; Ipolyi, Ildiko M.; Oswald, Peter; Krauss, Martin; Schulze, Tobias; Haglund, Peter; Letzel, Thomas; Grosse, Sylvia; Thomaidis, Nikolaos S. (1 August 2015). "Non-target screening with high-resolution mass spectrometry: critical review using a collaborative trial on water analysis". Analytical and Bioanalytical Chemistry. 407 (21): 6237–6255. doi:10.1007/s00216-015-8681-7. hdl:10234/147867. ISSN 1618-2650. PMID 25976391. S2CID 29696368.
Sources: en.wikipedia.org
Undeveloped terrain is hilly to mountainous, with minimal flat land, and consists mostly of grassland, woodland, shrubland, or farmland. About 40% of the remaining land area is country parks and nature reserves. The territory has a diverse ecosystem; over 3,000 species of vascular plants occur in the region (300 of which are native to Hong Kong), and thousands of insect, avian, and marine species. Hong Kong UNESCO Global Geopark was inaugurated on 3 November 2009. It is a single entity of land area over 150 km2 across parts of the eastern and northeastern New Territories. On 18 September 2011, UNESCO listed the geopark as part of its Global Geoparks Network. The Hong Kong UNESCO Global Geopark consists of two geological regions:
Bukele created a scholarship program, known as the Dalton Project and funded by his salary, for youth in San Salvador to prevent them from joining gangs. Bukele also created the My New School project to modernize San Salvador's primary schools. In May 2015, he signed an agreement with Panama City mayor José Blandón to establish a sister city relationship between San Salvador and Panama City. In November 2015, Bukele signed an agreement with the Spanish National League of Professional Football to promote sports for San Salvador's youth. In September 2016, Bukele visited Washington, D.C. and met with Mayor Muriel Bowser to discuss the implementation of urban-development projects. Bukele received the keys to the city of Gaithersburg, Maryland, and 11 September was designated the "Day of Mayor Nayib Bukele" ("Día del alcalde Nayib Bukele"). He visited Taipei in February 2017 and met with Taiwanese president Tsai Ing-wen to enhance the sister-city relationship between San Salvador and Taipei. In February 2018, Bukele attended the 32nd International Mayors Conference in Jerusalem and prayed at the Western Wall.
The Central Command adds it struck roughly 140 military targets in Iran after the attack. CENTCOM declares that the strait is "open to all vessels" and "Iran does not control" it. CENTCOM announces that it conducted additional strikes on dozens of Iranian targets over attacks against vessels to further degrade the regime's capability to attack civilian sailors and commercial ships in the strait. The US forces use suicide drone boats in combat for the first time to strike an Iranian submarine and ship maintenance facility at Bandar Abbas Naval Base. Mitch McConnell releases a statement amidst ongoing speculation about his health, stating he was hospitalized for pneumonia. July 13 2026 Iran war: Trump announces that the US will reinstate the "Iranian blockade in the Strait of Hormuz" and impose a 20% toll on cargo shipping through the strait. According to Trump, "The U.S.A. will be, from this point forward, known as 'THE GUARDIAN OF THE HORMUZ STRAIT.'" Trump describes it as a matter of fairness, claiming that the toll would cover "any and all costs necessary to do the job of providing safety and security to this very volatile section of the world." American-led Combined Maritime Forces' Joint Maritime Information Centre (JMIC) announces that the US naval blockade on Iran will start the following day. Trump formally informs the US Congress that the country has renewed hostilities against Iran. Trump declares that the US will hit Iran hard on that day and the next day, saying that the MoU was a test that the regime did not honor.
Adenomatous polyposis coli protein 2 is a protein that in humans is encoded by the APC2 gene. This is a dual-functional protein which is especially prevalant in the developing brain, and involved in cell signaling (specifically Wnt signaling) and stabilizing the cytoskeleton. Frizzled receptors are a type of cell receptor involved in a variety of functions including embryonic development and cell proliferation. These receptors trigger a cascade of reactions called the Wnt signaling pathway that eventually leads to interaction with the DNA via the protein beta-catenin, which affects which proteins get produced by the cell. The APC2 protein promotes the formation of a protein complex which is involved in breaking down the protein beta-catenin. The APC2 protein stabilizes microtubules, which are part of the cell cytoskeleton. It may also be involved in the regulation of actin fibers my means of GTPase activation (specifically the Rho family).
The fragment molecular orbital method (FMO) was developed by Kazuo Kitaura and coworkers in 1999. FMO is deeply interconnected with the energy decomposition analysis (EDA) by Kazuo Kitaura and Keiji Morokuma, developed in 1976. The main use of FMO is to compute very large molecular systems by dividing them into fragments and performing ab initio or density functional quantum-mechanical calculations of fragments and their dimers, whereby the Coulomb field from the whole system is included. The latter feature allows fragment calculations without using caps. The mutually consistent field (MCF) method had introduced the idea of self-consistent fragment calculations in their embedding potential, which was later used with some modifications in various methods including FMO. There had been other methods related to FMO including the incremental correlation method by H. Stoll (1992). Later, other methods closely related to FMO were proposed including the kernel energy method of L. Huang and the electrostatically embedded many-body expansion by E. Dahlke, S. Hirata and later M. Kamiya suggested approaches also very closely related to FMO. Effective fragment molecular orbital (EFMO) method combines some features of the effective fragment potentials (EFP) and FMO. A detailed perspective on the fragment-based method development can be found in a review.
Sources: en.wikipedia.org
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.
Detection usually uses liquid chromatography-tandem mass spectrometry after sample cleanup. Laboratories look for the parent compound or metabolites. The method requires validated reference standards and controls.
Legality varies by country. In many places it is an unapproved drug and cannot be legally sold for human consumption. Purchasing from online vendors carries legal and quality risks.
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.