Everything below concerns Laboratory compound. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-10-13. Where a claim depends on a specific study, the study is described rather than over-claimed.
Activation of PPARδ changes transcription of genes involved in fatty acid transport, mitochondrial function, and skeletal muscle fuel preference. In rodent studies, pharmacological PPARδ activation was associated with increased endurance and altered body composition. These findings generated interest in performance enhancement, but species differences and study designs limit direct extrapolation to humans. Small human trials were conducted in the 2000s and later discontinued. The extent to which cardarine produces similar metabolic or performance effects in people remains an open question.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
GW501516 acts as a ligand for PPAR delta, a nuclear receptor that regulates transcription of genes involved in fatty acid oxidation and energy use. Activation of this receptor in skeletal muscle shifts metabolism toward fat burning in animal models. The compound does not burn fat directly; it changes gene expression over hours to days. Researchers study it to understand metabolic flexibility and exercise adaptation. Effects observed in rodents are not automatically expected in humans.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic PPARδ agonist | Not a steroid or a selective androgen receptor modulator. |
| Common synonyms | Cardarine, GW501516, GW-501516, endurobol | Names vary by supplier and literature source. |
| Appearance | White to off-white powder | Consistent with many small-molecule research chemicals. |
| Solubility | Low in water; soluble in DMSO and ethanol | Often prepared in organic solvent for laboratory work. |
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid and energy metabolism. |
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.
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.
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.
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.
== Procedure == After fasting overnight, a catheter is passed into the patient's duodenum. The patient receives sequential intravenous injections of first secretin then either CKK or a synthetic 8-residue peptide representing the C-terminal 8 of CKK (ceruletide). Duodenal fluid is collected at 15 minute intervals for at least an hour, and the properties of the fluid are used to assess exocrine function of the pancreas. The CCK test may be administered in conjunction with an ultrasound test to visually monitor gall bladder contraction. While the test is usually administered in a supine position, Dr. William Smedley of Wilkes Barre, Pennsylvania has detected previously missed gallbladder abnormalities by administering the test in an erect position. The concentration and output of bicarbonate with the secretin-CCK test is similar to what has been observed with the standard secretin test. The secretin-induced rapid flow of water results in lower and often unreliable enzyme concentrations. CCK also induces gallbladder contraction and the release of bile, which may further dilute enzyme concentrations. As a result, the quantification of total enzyme output (units/min) must be determined through continuous collection of duodenal fluid with or without the use of perfusion markers. Measurement of more than one enzyme (i.e. amylase, lipase, and tryptase) and bicarbonate may improve sensitivity since some patients may possess deficiencies of one parameter and not the others.
== UPSC Museum == The Museum Building is located within the premises of the UPSC, the Dholpur House, Shahjahan Road, New Delhi. There prevailed for a long time a feeling that an institution like the Union Public Service Commission that has in its possession a rich treasure of archival material: original Pamphlets, Documents, reports, and other Records not easily accessible to the public, should have a Museum providing the public a window to have a vision of the great journey of this august institution. Accordingly, the Union Public Service Commission decided to set up a A museum where such materials could be aesthetically displayed for discerning visitors.
At the 1955 Tokyo conference, Pincus had also presented the first findings of ovulation inhibition by oral progestins in animals, specifically 19-nortestosterone derivatives like noretynodrel and norethisterone. These progestins were far more potent than progesterone, requiring much smaller doses orally. By December 1955, inhibition of ovulation by oral noretynodrel and norethisterone had been demonstrated in women. These findings as well as results in animals were published in 1956. Noretynodrel and norethisterone did not show the problems associated with oral progesterone—in the studies, they fully inhibited ovulation and did not produce menstruation-related side effects. Consequently, oral progesterone was abandoned as a hormonal contraceptive in women. The first birth control pills to be introduced were a noretynodrel-containing product in 1957 and a norethisterone-containing product in 1963, followed by numerous others containing a diversity of progestins. Progesterone itself has never been introduced for use in birth control pills. More modern clinical studies of oral progesterone demonstrating elevated levels of progesterone and end-organ responses in women, specifically progestational endometrial changes, were published between 1980 and 1983. Up to this point, many clinicians and researchers apparently still thought that oral progesterone was inactive. It was not until almost half a century after the introduction of progesterone in medicine that a reasonably effective oral formulation of progesterone was marketed.
Sources: en.wikipedia.org
=== Streptomyces === Daptomycin is another naturally occurring lipidated peptide, produced by the Gram positive bacterium Streptomyces roseoporous. The structure of Daptomycin consists of a decanoyl lipid chain attached to a partially cyclised peptide head group. It has very potent antimicrobial properties and is used as an antibiotic to treat life-threatening conditions caused by Gram positive bacteria including MRSA (methicillin-resistant Staphylococcus aureus) and vancomycin resistant Enterococci. As with the Bacillus subtilis lipidated peptides, the permeation of the cell membrane is what gives it its properties, and the mechanism of action with daptomycin is thought to involve the insertion of the decanoyl chain into the bacterial membrane to cause disruption. This then causes a serious depolarization resulting in the inhibition of various synthesis processes including those of DNA, protein and RNA, leading to apoptosis.
=== Minimum wages === In May 2026, the Karnataka government revised minimum wages by approximately 60 percent across 81 scheduled sectors. Under the revised structure, the minimum monthly wage for unskilled workers in the Greater Bengaluru area was reported at ₹23,376, while highly skilled workers were entitled to ₹31,114. Rates elsewhere in Karnataka ranged between ₹19,300 and ₹21,251 depending on location and category. Lad described the revision as a long-standing demand of the labour community and said the revised framework was intended to provide greater economic security to workers in the unorganized and specified sectors.
Instead, the German forces were equipped with US nuclear weapons. On 13 November 1957, in the Konzerthaus (Concert Hall) in Vienna, Hahn warned of the "dangers of A- and H-bomb-experiments", and declared that "today war is no means of politics anymore – it will only destroy all countries in the world". His highly acclaimed speech was transmitted internationally by the Austrian radio, Österreichischer Rundfunk (ÖR). On 28 December 1957, Hahn repeated his appeal in an English translation for the Bulgarian Radio in Sofia, which was broadcast in all Warsaw pact states.
== Other animals == Hyaluronan is used in treatment of articular disorders in horses, in particular those in competition or heavy work. It is indicated for carpal and fetlock joint dysfunctions, but not when joint sepsis or fracture are suspected. It is especially used for synovitis associated with equine osteoarthritis. It can be injected directly into an affected joint, or intravenously for less localized disorders. It may cause mild heating of the joint if directly injected, but this does not affect the clinical outcome. Intra-articularly administered medicine is fully metabolized in less than a week. According to Canadian regulation, hyaluronan in HY-50 preparation should not be administered to animals to be slaughtered for horse meat. In Europe, however, the same preparation is not considered to have any such effect, and edibility of the horse meat is not affected.
Sources: en.wikipedia.org
Deprotonation of carboxylic acids gives carboxylate anions; these are resonance stabilized, because the negative charge is delocalized over the two oxygen atoms, increasing the stability of the anion. Each of the carbon–oxygen bonds in the carboxylate anion has a partial double-bond character. The carbonyl carbon's partial positive charge is also weakened by the −1/2 negative charges on the 2 oxygen atoms.
Libya suffered a humiliating defeat as it was completely expelled from Chad and its commander Khalifa Haftar captured, along with 600-700 Libyan soldiers. Gaddafi disavowed Haftar and the other prisoners; one possible contributing factor to this repudiation may have been that Gaddafi had signed an agreement to withdraw Libyan forces, and Haftar's operations had been in violation of this. An embittered Haftar then joined the anti-Gaddafi National Front for the Salvation of Libya, became a CIA asset, and was given refuge in the US. Many African nations were tired of Libya's interference in their affairs; by 1980, nine African states had severed diplomatic relations, while in 1982 the OAU cancelled its scheduled conference in Tripoli to prevent Gaddafi gaining chairmanship. Some African states, however, such as Jerry Rawlings's Ghana and Thomas Sankara's Burkina Faso, had warm relations with Libya during the 1980s. Proposing political unity with Morocco, in August 1984, Gaddafi and Moroccan monarch Hassan II signed the Oujda Treaty, forming the Arab–African Union; such a union was considered surprising due to the political differences and longstanding enmity that existed between the two. In a sign of warming relations, Gaddafi promised to stop funding the Polisario Front and Hassan II extradited former RCC member Umar Muhayshi to Libya, where he was immediately killed. But relations deteriorated, particularly due to Morocco's friendship with the US and Israel; in August 1986, Hassan abolished the union.
== Abundance == Proteins exist as an ensemble of similar structures with some regions more constrained than others. IDPs occupy the extreme end of this spectrum of flexibility and include proteins of considerable local structure tendency or flexible multidomain assemblies. Intrinsic disorder is particularly elevated among proteins that regulate chromatin and transcription, and bioinformatic predictions indicate that is more common in genomes and proteomes than in known structures in the protein database. Based on DISOPRED2 prediction, long (>30 residue) disordered segments occur in 2.0% of archaean, 4.2% of eubacterial and 33.0% of eukaryotic proteins, including certain disease-related proteins.
One method based on the chemical constitution of the non-glucose part of the molecules has been proposed that posits four groups: (1) alkyl derivatives, (2) benzene derivatives, (3) styrolene derivatives, and (4) anthracene derivatives. A group may also be constructed to include the cyanogenic glucosides, i.e. those containing prussic acid. Alternate classifications follow a botanical classification, which has several advantages; in particular, plants of allied genera contain similar compounds. This article follows the chemical classification and discusses only the more important compounds.
== Biological role == Surface proteins of Gram-positive bacteria play an important role in the pathogenesis of human infections such as Clostridioides difficile infection. These surface/adhesion proteins mediate the initial attachment of bacteria to host tissues. These proteins are covalently linked to the peptidoglycan of the bacterial cell wall. As more and more pathogens become resistant to antibiotics, inhibition of sortases may offer a novel strategy against gram-positive bacterial infections. SrtB, in particular, has gained much attention and is recognized as a promising target and deletion of its gene in gram-positive bacteria will lead to serious virulence defects. Crystal structures of these SrtB enzymes from different species have been solved with ligands/inhibitors bound to their active site. With knowledge of the active site, the development of better therapeutics against these bacteria species can be done.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist. It is not a steroid or a selective androgen receptor modulator. It was developed and studied as a research compound for metabolic pathways.
It binds to and activates PPARδ, a nuclear receptor that regulates genes related to fatty acid oxidation and energy use. This activation alters transcription in tissues such as skeletal muscle and liver. The full range of downstream effects in humans is not fully established.
No, cardarine is not known to occur naturally in plants, animals, or humans. It is a synthetic molecule produced for laboratory research. Products labeled as cardarine should therefore be treated as manufactured chemicals with variable purity.
It binds to and activates PPAR delta, a nuclear receptor that controls expression of genes related to fatty acid oxidation. This mechanism can alter energy metabolism in animal models. It is not a direct stimulant or fat-burning enzyme.