The short version of PPARδ agonist fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-01-03. Anything still debated is marked as such rather than presented as settled.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
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.
Cardarine is a common name for GW501516, a synthetic compound developed in the 1990s through research collaborations involving GlaxoSmithKline. It belongs to a class of molecules known as peroxisome proliferator-activated receptor delta agonists. Early studies explored its effects on lipid metabolism and energy expenditure in animal models. The compound was never approved as a human medicine, and clinical development was discontinued. In the years since, it has appeared in fitness and bodybuilding communities as a performance-enhancing substance. Regulatory agencies classify it as an unapproved drug.
PPARδ is a nuclear receptor that regulates gene expression related to fatty acid oxidation, glucose homeostasis, and mitochondrial function. GW501516 binds to this receptor with high affinity and activates downstream signaling in skeletal muscle and other tissues. Animal studies reported increased endurance and altered fuel preference, but human data remain limited and inconsistent. The precise relationship between receptor activation and observed physiological changes is still an area of active investigation. Researchers have also examined whether the compound affects inflammation or cell proliferation. No approved therapeutic indication exists for cardarine.
| Property | Value | Notes |
|---|---|---|
| Common name | Cardarine | Common internet and media name. |
| Research code | GW501516 | Also written GW-1516. |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator. |
| Development status | Discontinued | Clinical development halted after rodent cancer findings. |
| Regulatory status | Prohibited in sport | Listed by WADA; not approved as medicine. |
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.
Preclinical research reported that GW501516 increased running endurance in mice and improved lipid profiles in some animal species. Early human trials explored effects on high-density lipoprotein cholesterol, triglycerides, and glucose handling, but the program was discontinued. Published human data are sparse and do not establish efficacy for any condition. Studies also examined PPAR delta in cancer biology, with conflicting findings across models. The relationship between receptor activation, tissue context, and disease risk remains an active area of investigation.
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.
Cardarine has no approved therapeutic indication and is not marketed as a medicine. The World Anti-Doping Agency lists GW501516 as a prohibited substance at all times, covering both in-competition and out-of-competition periods. National laws vary: some countries treat it as an unapproved drug subject to import controls, while others have specific restrictions on sale for human consumption. It is often sold as a research chemical, a label that does not imply safety or legality. Enforcement actions have targeted online vendors and shipments.
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.
Women who became pregnant within approximately six months of the final dose showed vaccine efficacy estimates between 57% and 86% against parasitaemia in pregnancy. Because malaria and HIV infections frequently overlap geographically, PfSPZ Vaccine has been studied in HIV-positive adults. A randomized, double-blind, placebo-controlled trial in Tanzania administered five intravenous doses to HIV-negative and well-controlled HIV-positive participants. The vaccine was safe in both groups, but protection against CHMI was observed only in HIV-negative individuals, with an estimated vaccine efficacy of 80% in HIV-negative adults and no measurable efficacy in the HIV-positive cohort. Serological profiling indicated that HIV infection did not markedly diminish the magnitude of antibody responses to key sporozoite antigens, although cellular correlates of protection appear impaired in HIV-positive individuals. Recent analyses have examined the immune targets associated with PfSPZ-induced protection. Whole-proteome antibody profiling in Tanzanian trial participants revealed that vaccination elicits a focused IgG and IgM response to a limited set of Plasmodium falciparum antigens, including circumsporozoite protein and several liver- and blood-stage proteins. A whole-genome sieve analysis of parasites obtained from vaccinated and placebo recipients in West African field trials identified distinct parasite polymorphisms associated with vaccine breakthrough infections.
These oligosaccharides are used in combination to improve the beneficial gut bacteria while eliminating the harmful gut bacteria. The aging dog goes through changes in brain and cognitive health. There are two highly important ingredients that can be included in senior dog foods to help prevent cognitive decline and improve brain health. These ingredients are vitamin E and L-carnitine. Vitamin E acts as an antioxidant, which can prevent oxidative damage that occurs during aging. L-carnitine is used to improve mitochondrial function, which can also help to prevent and lower rates of oxidative damage. Skin and coat health is important in all dogs, but especially becomes important as dogs age. An important nutrient to look for in senior dog foods to support coat health is linoleic acid, which can be found in corn and soybean oil. Another important nutrient is vitamin A, which helps with keratinization of hair. Good sources of vitamin A for skin and coat health include egg yolk and liver. Immune system health has been shown to decline in aging dogs. The ratio of omega-6 to omega-3 fatty acids plays an important role in providing optimal health. Vitamin E can be used as an antioxidant in senior dog foods. Pre- and probiotics can also be added to senior dog foods to help improve the beneficial bacteria in the gut, providing support for the immune system.
Radio direction finding (RDF) – this is a general technique, used since the early 1900s, of using specialized radio receivers with directional antennas (RDF receivers) to determine the exact bearing of a radio signal, to determine the location of the transmitter. The location of a terrestrial transmitter can be determined by simple triangulation from bearings taken by two RDF stations separated geographically, as the point where the two bearing lines cross, this is called a "fix". Military forces use RDF to locate enemy forces by their tactical radio transmissions, counterintelligence services use it to locate clandestine transmitters used by espionage agents, and governments use it to locate unlicensed transmitters or interference sources. Older RDF receivers used rotatable loop antennas, the antenna is rotated until the radio signal strength is weakest, indicating the transmitter is in one of the antenna's two nulls. The nulls are used since they are sharper than the antenna's lobes (maxima). More modern receivers use phased array antennas which have a much greater angular resolution. Animal migration tracking – a widely used technique in wildlife biology, conservation biology, and wildlife management in which small battery-powered radio transmitters are attached to wild animals so their movements can be tracked with a directional RDF receiver. Sometimes the transmitter is implanted in the animal. The VHF band is typically used since antennas in this band are fairly compact.
Sources: en.wikipedia.org
In Ireland, most universities and technological universities are publicly funded but institutionally autonomous rather than directly state-owned. Higher education is provided by universities, technological universities, institutes of technology, colleges of education and specialist institutions. The Higher Education Authority is the statutory agency responsible for allocating exchequer funding to universities, institutes of technology and other higher education institutions. Under the Free Fees Initiative, the state pays undergraduate tuition fees for eligible students, while students are required to pay a student contribution charge. For the 2025/26 academic year, the student contribution charge is €2,500 per year. Independent and private higher education institutions also operate in Ireland. The Royal College of Surgeons in Ireland was authorised to use the title "university" in Ireland in 2019, becoming RCSI University of Medicine and Health Sciences; it describes itself as an independent, not-for-profit university.
== Function == Cytosolic and membrane-bound forms of glutathione S-transferase are encoded by two distinct supergene families. At present, eight distinct classes of the soluble cytoplasmic mammalian glutathione S-transferases have been identified: alpha, kappa, mu, omega, pi, sigma, theta, and zeta. This gene encodes a glutathione S-transferase that belongs to the mu class. The mu class of enzymes functions in the detoxification of electrophilic compounds, including some carcinogens, therapeutic drugs, environmental toxins and products of oxidative stress, by conjugation with glutathione. The genes encoding the mu class of enzymes are organized in a gene cluster on chromosome 1p13.3 and are known to be highly polymorphic. These genetic variations can change an individual's susceptibility to carcinogens and toxins as well as affect the toxicity and efficacy of certain drugs. Mutations of this class mu gene have been linked with a slight increase in a number of cancers, likely due to exposure with environmental toxins.
Ile-(C=O)O− + Lys-NH3+ → Ile-(C=O)NH-Lys + H2O Isopeptide bond formation is typically enzyme-catalyzed. The reaction between lysine and glutamine, as shown above, is catalyzed by a transglutaminase. Another example of enzyme-catalyzed isopeptide bond formation is the formation of the glutathione molecule. Glutathione, a tripeptide, contains a normal peptide bond (between cysteine and glycine) and an isopeptide bond (between glutamate and cysteine). The formation of the isopeptide bond between the γ-carboxyl group of glutamate and the α-amino group of cysteine is catalyzed by the enzyme γ-glutamylcysteine synthetase. The isopeptide bond is formed instead of a eupeptide bond because intracellular peptidases are unable to recognize this linkage and therefore do not hydrolyze the bond. An isopeptide bond can form spontaneously as observed in the maturation of the bacteriophage HK97 capsid. In this case, the ε-amino group of lysine autocatalytically reacts with the side chain carboxamide group of asparagine. Spontaneous isopeptide bond formation between lysine and asparagine also occurs in Gram-positive bacterial pili.
Sources: en.wikipedia.org
== People with the name == Link (singer) (Lincoln Browder, born 1964), American R&B singer Link (surname) Charles Lincoln "Link" Neal III of Rhett & Link (born 1978), American comedian and YouTuber Link Wray (1929–2005), American rock-and-roll guitarist
== Function == Fyn is a protein, present in the signaling pathway of integrins, which activates ras. Fyn is a tyrosine-specific phospho-transferase that is a member of the Src family of non-receptor tyrosine protein kinases. (This family also includes Abl, Src, focal adhesion kinase and Janus kinase.) Fyn is located downstream of several cell surface receptors, commonly associated with neuronal development and T-cell signaling. When fyn is activated it causes downstream activation of molecular signals that drive processes crucial to growth and motility of cells. Fyn is primarily localized to the cytoplasmic leaflet of the plasma membrane, where it phosphorylates tyrosine residues on key targets involved in a variety of different signaling pathways. Tyrosine phosphorylation of target proteins by Fyn serves to either regulate target protein activity, and/or to generate a binding site on the target protein that recruits other signaling molecules. Fyn also is a tumor suppressor. When this normal biology is compromised, the altered Fyn becomes involved in the neoplastic transformation of normal cells to cancerous ones following the pathway from pre-invasive, to invasive, and ultimately metastasis. Fyn also appears to play an important role in fertilization including in the rapid Inositol trisphosphate-mediated calcium signaling which occurs when oocyte and sperm interact. Fyn expression levels are much higher in oocytes than even neurons and T-cells and it has been suggested to be an 'oocyte-specific kinase'.
=== Surface Tension Uncut and On a Rail Uncut === In Surface Tension Uncut, the "Surface Tension" chapter was expanded to include certain areas of the original game that were not released along with the remake, as the developer had left before his work was finished. The developer, Chon Kemp, known on the Black Mesa: Community Forums by the pseudonym TextFAMGUY1, also modified the "On a Rail" chapter to include the areas cut from Black Mesa to make gameplay less tedious. Kemp was later hired by Crowbar Collective to remake Surface Tension Uncut for the Steam release, while the uncut version of "On a Rail" was published on the Steam Workshop.
=== Telescopes === Solar Submillimeter Telescope, located in the "El Leoncito" Astronomical Complex Space Surveillance Telescope, a military telescope located at Exmouth, Western Australia. Spitzer Space Telescope, NASA infrared space observatory Swedish Solar Telescope
Sources: en.wikipedia.org
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.
Preclinical rodent studies reported cancers, including liver and bladder tumors, at tested doses. The human relevance of those findings is uncertain, but development was discontinued. No approved human product resulted.
No. It remains an investigational compound without approved therapeutic labeling. Sports regulators prohibit its use, and health agencies have warned against consuming it.
Cardarine is a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.