research chemical comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2025-09-05. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
| Property | Value | Notes |
|---|---|---|
| IUPAC name | {4-[({4-methyl-2-[4-(trifluoromethyl)phenyl]-1,3-thiazol-5-yl}methyl)sulfanyl]phenoxy}acetic acid | Systematic name for GW501516 |
| CAS Registry Number | 317318-70-0 | Unique identifier for the parent compound |
| Molecular formula | C21H18F3NO3S2 | Includes carbon, hydrogen, fluorine, nitrogen, oxygen, and sulfur |
| Molecular weight | 453.5 g/mol | Approximate value for the neutral form |
| Appearance | White to off-white powder | Typical description for purified laboratory material |
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.
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.
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.
Gottron's papules are violaceous erythematous papules that commonly occur overlying the dorsal interphalangeal (DIP) or metacarpophalangeal joints (MCP), as well as the elbows or knee joints. They are found in approximately 70 percent of patients diagnosed with dermatomyositis.
those with ST segment elevation or new bundle branch block (suspicious for acute injury and a possible candidate for acute reperfusion therapy with thrombolytics or primary PCI), those with ST segment depression or T wave inversion (suspicious for ischemia), and those with a so-called non-diagnostic or normal ECG. A normal ECG does not rule out acute myocardial infarction. Mistakes in interpretation are relatively common, and the failure to identify high risk features has a negative effect on the quality of patient care. It should be determined if a person is at high risk for myocardial infarction before conducting imaging tests to make a diagnosis. People who have a normal ECG and who are able to exercise, for example, do not merit routine imaging. Imaging tests such as stress radionuclide myocardial perfusion imaging or stress echocardiography can confirm a diagnosis when a person's history, physical exam, ECG and cardiac biomarkers suggest the likelihood of a problem.
=== Mechanism of action === Hydroxychloroquine increases lysosomal pH in antigen-presenting cells by two mechanisms: As a weak base, it is a proton acceptor and via this chemical interaction, its accumulation in lysozymes raises the intralysosomal pH, but this mechanism does not fully account for the effect of hydroxychloroquine on pH. Additionally, in parasites that are susceptible to hydroxychloroquine, it interferes with the endocytosis and proteolysis of hemoglobin and inhibits the activity of lysosomal enzymes, thereby raising the lysosomal pH by more than two orders of magnitude over the weak base effect alone. In 2003, a novel mechanism was described wherein hydroxychloroquine inhibits stimulation of the toll-like receptor (TLR) 9 family receptors. TLRs are cellular receptors for microbial products that induce inflammatory responses through activation of the innate immune system. As with other quinoline antimalarial drugs, the antimalarial mechanism of action of quinine has not been fully resolved. The most accepted model is based on hydrochloroquinine and involves the inhibition of hemozoin biocrystallization, which facilitates the aggregation of cytotoxic heme. Free cytotoxic heme accumulates in the parasites, causing death. Hydroxychloroquine increases the risk of low blood sugar through several mechanisms. These include decreased clearance of the hormone insulin from the blood, increased insulin sensitivity, and increased release of insulin from the pancreas.
=== Diet === Vitamin A, also known as retinoids, benefits the skin by normalizing keratinization, downregulating sebum production, which contributes to acne, and reversing and treating photodamage, striae, and cellulite. Vitamin D and analogues are used to downregulate the cutaneous immune system and epithelial proliferation while promoting differentiation. Vitamin C is an antioxidant that regulates collagen synthesis, forms barrier lipids, regenerates vitamin E, and provides photoprotection. Vitamin E is a membrane antioxidant that protects against oxidative damage caused most commonly in skin by UV rays.
Sources: en.wikipedia.org
== Examples == An early application of tetramer technology focused on the cell-mediated immune response to HIV infection. MHC tetramers were developed to present HIV antigens and used to find the percentage of CTLs specific to those HIV antigens in blood samples of infected patients. This was compared to results of cytotoxic assays and plasma RNA viral load to characterize the function of CTLs in HIV infection. The CTLs that bound to tetramers were sorted into ELIspot wells for analysis of cytokine secretion. Another study utilized MHC tetramer complexes to investigate the effectiveness of an influenza vaccine delivery method. Mice were given subcutaneous and intranasal vaccinations for influenza, and tetramer stains coupled with flow cytometry were used to quantify the CTLs specific to the antigen used in the vaccine. This allowed for comparison of the immune response (the number of T-cells that target a virus) in two different vaccine delivery methods.
In 2015, the world's first successful penis transplant took place in Cape Town, South Africa in a nine-hour operation performed by surgeons from Stellenbosch University and Tygerberg Hospital. The 21-year-old recipient, who had been sexually active, had lost his penis in a botched circumcision at 18.
MSPs vote 68–55 in favour of the 2024 Scottish budget, which includes a council tax freeze and 45% and 48% income tax rates for higher earners. Fergus Ewing loses his appeal against a week-long suspension from the SNP group at Holyrood in September 2023 after he criticised the party leadership. MPs vote to suspend Scott Benton from Parliament for 35 days, triggering a recall petition. 28 February – The UK government announces a £31m financial package to improve MPs security. Pro-Palestinian groups say they will continue to march after Home Secretary James Cleverly questioned whether holding regular marches "adds value" to calls for a ceasefire in Gaza during an interview with The Times. The High Court in Belfast rules that conditional immunity from prosecutions for Troubles-era crimes, contained in the Northern Ireland Troubles (Legacy and Reconciliation) Act 2023, is in breach of the European Convention on Human Rights. Addressing a meeting of police leaders, Sunak warns of a "growing consensus that mob rule is replacing democratic rule" and says that "a pattern of increasingly violent and intimidatory [sic] behaviour" cannot be allowed to stop elected representatives doing their job. 29 February – 2024 Rochdale by-election: In an unusually chaotic by-election, George Galloway wins for the Workers Party of Britain, marking his return to parliament. Independent candidate David Tully comes second, with the Conservative candidate Paul Ellison coming third. Both the Labour and Green Party candidates were disowned by their respective parties.
March 12 – 17: 2018 Youth Pan American Championships (Men) in Guadalajara In the final, Argentina defeated Mexico, 3–2. Canada took third place and Paraguay took fourth place. March 12 – 17: 2018 Youth Pan American Championships (Women) in Guadalajara In the final, Argentina defeated Uruguay, 4–0. Mexico took third place and Paraguay took fourth place. May 13 – 20: 2018 Asian Women's Hockey Champions Trophy in Donghae City South Korea defeated India, 1–0, to win their third Asian Women's Hockey Champions Trophy title. China took third place. October 18 – 28: 2018 Asian Men's Hockey Champions Trophy in Muscat Note: Due to heavy rain, both India and Pakistan took first place here. Malaysia took third place. July 11 – 15: IFA 2018 Fistball U18 World Championships in Roxbury Township July 24 – 28: IFA 2018 Fistball Women's World Championship in Linz
Waters was involved in mentorship of chemistry students from nontraditional and disadvantaged backgrounds as part of the American Chemical Society's Project SEED. She has advanced multiple campus groups encouraging women scholars in physical sciences. Waters mentored for TANDEMplusIDEA, the international mentoring program for female scientists from 2007 to 2009. Waters was on the board of directors for the Mesilla Chemistry Workshop held in July from 2006 to 2018. From 2011 to 2013, Waters was a UNC WOWS Scholar (Working on Women in Science). From 2013 to 2018, she was a Faculty Advisor for UNC WISE (Women in Science and Engineering, graduate student organization).
Sources: en.wikipedia.org
No. Major drug regulators have not approved GW501516 for treating any medical condition. Products sold as cardarine are typically unapproved research chemicals or supplements, so their contents and safety are not assured.
It is prohibited by the World Anti-Doping Agency as a hormone and metabolic modulator. Athletes who test positive for GW501516 can face sanctions, including suspensions and loss of results.
Cardarine is a common or trade-style name, while GW501516 is the research code for the same chemical entity. Some sources also use Endurobol or GSK-516. The names refer to the same compound, not distinct drugs.
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.