PPARδ agonist 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.
Updated 2026-03-16. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516, GW-501516, GW 501516, endurobol | Names vary in research and anti-doping documents. |
| Chemical class | Synthetic PPARδ agonist | Small-molecule nuclear receptor ligand. |
| CAS Registry Number | 317318-70-0 | Identifier commonly associated with GW501516. |
| Appearance | White to off-white powder | Typical for purified research material. |
| Solubility | Low in water; soluble in DMSO and ethanol | Organic solvents are common for laboratory stock solutions. |
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 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.
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.
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.
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.
1983: Indian immunologist Indira Nath became the first female scientist to receive the Shanti Swaroop Bhatnagar Award in the Medical Sciences category. 1983: Geologist Sudipta Sengupta and marine biologist Aditi Pant became the first Indian women to visit the Antarctic. 1984: American computer scientist and engineer Thelma Estrin, one of the first scientists to apply computer technology to healthcare and medical research, is awarded the IEEE Centennial Medal. 1985: After identifying HIV as the cause of AIDS, Chinese-American virologist Flossie Wong-Staal became the first scientist to clone and genetically map the HIV virus, enabling the development of the first HIV blood screening tests. 1986: Italian neurologist Rita Levi-Montalcini received the Nobel Prize in Physiology or Medicine, shared with Stanley Cohen, "for their discoveries of growth factors". 1988: American biochemist and pharmacologist Gertrude B. Elion received the Nobel Prize in Physiology or Medicine along with James W. Black and George H. Hitchings "for their discoveries of important principles for drug treatment". 1988: American scientist and inventor Patricia Bath (born 1942) became the first African-American to patent a medical device, namely the Laserphaco Probe for improving the use of lasers to remove cataracts.
Elion (1918–1999), American biochemist and recipient of the 1988 Nobel Prize in Physiology or Medicine for innovative methods of rational drug design Conrad Elvehjem (1901–1962), American biochemist who identified two vitamins, nicotinic acid (niacin) and nicotinamide Harry Julius Emeléus (1903–1993), British inorganic chemist known for work on fluorine chemistry Gladys Anderson Emerson (1903–1984), American chemist and early nutritionist, and the first person to isolate Vitamin E Emil Erlenmeyer (1825–1909), German chemist known for the early development of the theory of chemical structure and formulating the Erlenmeyer rule. Richard R. Ernst (1933–2021), Swiss physical chemist, 1991 Nobel Prize in Chemistry for the development of Fourier transform nuclear magnetic resonance spectroscopy Gerhard Ertl (born 1936), German physical chemist who laid the foundation of modern surface chemistry, 2007 Nobel prize in chemistry Margaret C. Etter (1943–1992), American chemist and developer of solid state chemistry for crystalline organic compounds Hans von Euler-Chelpin (1873–1964), Swedish chemist, winner of the 1929 Nobel Prize in Chemistry for work on the fermentation of sugar and enzymes Henry Eyring (1901–1981), Mexico-born American theoretical chemist known for the absolute rate theory of chemical reactions
Transcriptional regulators, as well as a growing number of other factors, regulate the induction of beige fat. Four regulators of transcription are central to WAT browning and serve as targets for many of the molecules known to influence this process. These include peroxisome proliferator-activated receptor gamma (PPARγ), PRDM16, peroxisome proliferator-activated receptor gamma coactivator 1 alpha (PGC-1α), and Early B-Cell Factor-2 (EBF2). The list of molecules that influence browning has grown in direct proportion to the popularity of this topic and is constantly evolving as more knowledge is acquired. Among these molecules are irisin and fibroblast growth factor 21 (FGF21), which have been well-studied and are believed to be important regulators of browning. Irisin is secreted from muscle in response to exercise and has been shown to increase browning by acting on beige preadipocytes. FGF21, a hormone secreted mainly by the liver, has garnered a great deal of interest after being identified as a potent stimulator of glucose uptake and a browning regulator through its effects on PGC-1α. It is increased in BAT during cold exposure and is thought to aid in resistance to diet-induced obesity FGF21 may also be secreted in response to exercise and a low protein diet, although the latter has not been thoroughly investigated. Data from these studies suggest that environmental factors like diet and exercise may be important mediators of browning.
=== Microscopic characteristics === In deposit, the spores are a deep reddish purple-brown color. The use of an optical microscope can reveal further details: the spores are oblong when seen in side view, and oblong to oval in frontal view, with dimensions of 10.5–15 by 6.5–8.5 μm. The basidia (spore bearing cells of the hymenium), are 20–31 by 5–9 μm, four-spored, and have clamps at their bases; there are no basidia found on the sterile gill edge. The cheilocystidia (cystidia on the gill edge) measure 15–30 by 4–7 μm, and are flask-shaped with long thin necks that are 1–3.5 μm wide. P. semilanceata does not have pleurocystidia (cystidia on the gill face). The cap cuticle is up to 90 μm thick, and is made of a tissue layer called an ixocutis—a gelatinized layer of hyphae lying parallel to the cap surface. The hyphae comprising the ixocutis are cylindrical, hyaline, and 1–3.5 μm wide. Immediately under the cap cuticle is the subpellis, made of hyphae that are 4–12 μm wide with yellowish-brown encrusted walls. There are clamp connections present in the hyphae of all tissues.
Using one of the above definitions, dinosaurs can be generally described as archosaurs with hind limbs held erect beneath the body. Other prehistoric animals, including pterosaurs, mosasaurs, ichthyosaurs, plesiosaurs, and Dimetrodon, while often popularly conceived of as dinosaurs, are not taxonomically classified as dinosaurs. Pterosaurs are distantly related to dinosaurs, being members of the clade Ornithodira. The other groups mentioned are, like dinosaurs and pterosaurs, members of Sauropsida (the reptile and bird clade), except Dimetrodon (which is a synapsid). None of them had the erect hind limb posture characteristic of true dinosaurs. Dinosaurs were the dominant terrestrial vertebrates of the Mesozoic Era, especially the Jurassic and Cretaceous periods. Other groups of animals were restricted in size and niches; mammals, for example, rarely exceeded the size of a domestic cat and were generally rodent-sized carnivores of small prey. Dinosaurs have always been recognized as an extremely varied group: over 900 non-avian dinosaur genera have been confidently identified (2018) with 1,124 species (2016). Estimates put the total number of dinosaur genera preserved in the fossil record at 1850, nearly 75% still undiscovered, and the number that ever existed (in or out of the fossil record) at 3,400. A 2016 estimate put the number of dinosaur species living in the Mesozoic at 1,543–2,468, compared to the number of modern-day birds (avian dinosaurs) at 10,806 species.
Sources: en.wikipedia.org
In 2002, the Nobel Prize in Chemistry was awarded to John Bennett Fenn for the development of electrospray ionization (ESI) and Koichi Tanaka for the development of soft laser desorption and their application to the ionization of biological macromolecules, especially proteins.
Hardtack is a mainstay in parts of Canada. Purity Factories is one maker of traditional hardtack. They specialize in a high density, high caloric product that is well suited for use by expeditions. Located in St. John's, Newfoundland and Labrador, they currently produce three varieties of hardtack:
Fluspirilene (Redeptin, Imap, R6218) is a diphenylbutylpiperidine typical antipsychotic drug, used for the treatment of schizophrenia. It is administered intramuscularly. It was discovered at Janssen Pharmaceutica in 1963. A 2007 systematic review investigated the efficacy of fluspirilene decanoate for people with schizophrenia:
=== Prostitution === Shortly after giving birth to her second child, Rose began to work as a prostitute, operating from an upstairs room at Cromwell Street and advertising her services in a local contact magazine. Fred encouraged Rose to seek clients in Gloucester's West Indian community through these advertisements. In addition to her prostitution, Rose engaged in casual sex with both male and female lodgers within their household, and individuals Fred encountered via his work. She also bragged to several people that no man or woman could completely satisfy her. When engaging in sexual relations with women, Rose would gradually increase the level of brutality to which she subjected her partner, with acts such as partially asphyxiating her partner or inserting increasingly large dildos into her partner's body. If the woman resisted or expressed any pain or fear, Rose would become greatly excited and typically ask: "Aren't you woman enough to take it?" To many of these women, it became apparent Rose and her husband (who regularly participated in threesomes with his wife and her lovers) took a particular pleasure from taking women beyond their sexual limits—typically via sessions involving bondage. The Wests openly admitted to taking a particular pleasure from any form of sex involving a strong measure of dominance, violence and pain. To cater to these fetishes, they amassed a large collection of bondage and restraining devices, magazines and photographs, later expanding this collection to include videos depicting bestiality and graphic child sexual abuse.
Sources: en.wikipedia.org
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.
No. Cardarine is not a steroid hormone; it targets the nuclear receptor PPARδ. Its classification in anti-doping rules differs from anabolic steroids, though it remains prohibited in sport.
Early rodent studies reported tumor formation at multiple sites, which raised safety concerns. Sponsors stopped clinical development, and no approved human product exists.
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.