This is a working overview of Cardarine, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-06-21. Anything still debated is marked as such rather than presented as settled.
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.
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.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
| 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 |
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
Detection of GW501516 in biological samples generally relies on liquid chromatography coupled with tandem mass spectrometry. Urine is a common matrix in anti-doping analysis, while blood or plasma may be used in research settings. Sample preparation can involve enzymatic hydrolysis, protein precipitation, or solid-phase extraction before instrumental analysis. Because the compound undergoes metabolism, assays may target the parent molecule, one or more metabolites, or both. Detection windows are not fixed; they depend on factors such as dose, route, individual metabolism, and assay sensitivity. Reference standards are required for accurate identification and quantification.
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.
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.
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
== Introduction == Isozymes were first described by R. L. Hunter and Clement Markert (1957) who defined them as different variants of the same enzyme having identical functions and present in the same individual. This definition encompasses (1) enzyme variants that are the product of different genes and thus represent different loci (described as isozymes) and (2) enzymes that are the product of different alleles of the same gene (described as allozymes). Isozymes are usually the result of gene duplication, but can also arise from polyploidisation or nucleic acid hybridization. Over evolutionary time, if the function of the new variant remains identical to the original, then it is likely that one or the other will be lost as mutations accumulate, resulting in a pseudogene. However, if the mutations do not immediately prevent the enzyme from functioning, but instead modify either its function, or its pattern of expression, then the two variants may both be favoured by natural selection and become specialised to different functions. For example, they may be expressed at different stages of development or in different tissues. Allozymes may result from point mutations or from insertion-deletion (indel) events that affect the coding sequence of the gene. As with any other new mutations, there are three things that may happen to a new allozyme:
== Uses == PET is both a medical and research tool used in pre-clinical and clinical settings. It is used heavily in the imaging of tumors and the search for metastases within the field of clinical oncology, and for the clinical diagnosis of certain diffuse brain diseases such as those causing various types of dementias. PET is valued as a research tool to learn and enhance knowledge of the normal human brain, heart function, and support drug development. PET is also used in pre-clinical studies using animals. It allows repeated investigations into the same subjects over time, where subjects can act as their own control and substantially reduces the numbers of animals required for a given study. This approach allows research studies to reduce the sample size needed while increasing the statistical quality of its results. Physiological processes result in anatomical changes within the body. Because PET can detect biochemical activity and the expression of certain proteins, it can provide molecular-level information long before any anatomical alterations become visible. PET achieves this by using radiolabelled molecular probes, which are taken up at varying rates depending on the tissue. Regional tracer uptake in different anatomical structures can then be visualized and approximately quantified based on the amount of injected positron-emitting tracer detected in the scan, via metrics like the standardized uptake value. It is possible to acquire PET images using a conventional dual-head gamma camera fitted with a coincidence detector.
It is responsible for the removal of interstitial fluid from tissues It absorbs and transports fatty acids and fats as chyle from the digestive system It transports white blood cells to and from the lymph nodes into the bones The lymph transports antigen-presenting cells, such as dendritic cells, to the lymph nodes where an immune response is stimulated.
Sources: en.wikipedia.org
=== Infection === If a chronic wound becomes more painful this is a good indication that it is infected. A lack of pain however does not mean that it is not infected. Other methods of determination are less effective.
=== Function in pregnancy === Progesterone plays a crucial role in pregnancy by supporting fetal development and maintaining the pregnancy. It is involved in the menstrual cycle, implantation, and is required for pregnancy maintenance. During implantation, it plays a role in its preservation through modulating the maternal immune response and suppressing the inflammatory response. By decreasing the maternal immune response, progesterone can allow the pregnancy to be accepted. Progesterone prepares the endometrium for implantation, as the level of progesterone increases, the capillaries grow. These capillaries spread throughout the granulosa layer of cells which promotes vascularization and blood flow in the endometrium, ensuring an adequate blood supply to the developing placenta and fetus. On the other hand, when there is no pregnancy occurred, the level of progesterone will decrease, which leads to menstruation. This means that bleeding from women's menstruation is bleeding after progesterone withdrawal.
In medicine, endoscopic sleeve gastroplasty (ESG) is a minimally-invasive, non-surgical (incisionless), endoscopic weight loss procedure that is part of the field of endoscopic bariatric therapies. To perform ESG, a physician sutures a patient's stomach into a narrower, smaller tube-like configuration. The result is a more restricted stomach that forces patients to feel fuller sooner, eating fewer calories, which facilitates weight loss.
Sources: en.wikipedia.org
In a short period of time, the seventeen-year-old went from open-mic nights at the club to regular paid shows, building his reputation in the process. Parallel to his increasing local Toronto-area popularity as an impressionist stand-up comic, Carrey tried to break into sketch comedy, auditioning to be a cast member for the 1980–81 season of NBC's Saturday Night Live. Carrey ended up not being selected by the show's new executive producer Jean Doumanian who picked thirty-one-year-old Charles Rocket instead. Decades later, after establishing himself as a Hollywood film star, Carrey would host the show in May 1996, January 2011, and October 2014. After not getting Saturday Night Live, Carrey took a voice acting job performing Clutch Cargo-inspired bits on The All-Night Show, an overnight program airing locally on the CFMT-TV channel branded as Multilingual Television (MTV). Continuing to perform his stand-up act of contortionist impressions in the city of Toronto and surrounding towns, in February 1981, nineteen-year-old Carrey was booked as the opening act for the rock band Goddo at The Roxy Theatre in Barrie for two shows on consecutive nights; the rock crowd booed him offstage and he refused to return for the second night. Two weeks later, however, a review of one of Carrey's spots at Yuk Yuk's—alongside a sizable photo of him doing a stage impression of Sammy Davis Jr.—appeared in the Toronto Star on the front page of its entertainment section with the writer Bruce Blackadar raving about "a genuine star coming to life".
The party says those involved will no longer be involved in the election campaign. Prominent Conservative donor Sir John Hall endorses Reform UK. The final televised debate of the 2024 general election takes place on BBC One Northern Ireland and features representatives from Northern Ireland's five main parties. Labour lifts its suspension of Rhianon Passmore after police say they had found no offence was committed regarding the number plates on her car. 28 June – Sunak speaks of his hurt and anger at his daughters having to hear a racial slur used about him by Reform UK activists. Essex Police say they are urgently trying to establish whether any criminal offences have been committed as a result of comments made by the Reform campaigners. Mark Hoath, the Reform UK candidate for Sutton Coldfield, is referred to the police after saying that a rival candidate, the Liberal Democrats' John Sweeney, "loved" the IRA. Edinburgh City Council establishes an emergency polling booth at City Chambers after a number of people across Scotland reported not receiving their postal votes. The emergency polling booth, which allows those who did not receive a postal vote to cast their vote in person, will operate until 30 June. Fife Council also announces an emergency polling booth at Fife House, Glenrothes that will be open on 29 June. The Green Party of Northern Ireland launches its manifesto, which includes plans to take Lough Neagh into public ownership, reforms to Stormont, a tax on the richest one percent of people and protecting public services from cuts.
Both kill tissue and can cause considerable damage, including death. Subclinical diabetes See: Impaired glucose tolerance. Subcutaneous injection Putting a fluid into the tissue under the skin with a needle and syringe. See also: Injection. Sucrose Sugar A class of carbohydrates that taste sweet. Sugar is a quick and easy fuel for the body to use. Types of sugar are lactose, glucose, fructose, and sucrose. Sulfonylureas Pills or capsules that people take to lower the level of glucose (sugar) in the blood. See also: Oral hypoglycemic agents. Symptom An indication of disease; a departure from normal function or feeling which is noticed by the person experiencing it. Having to urinate often is a symptom of diabetes. A symptom can be verified only by the person who has it, whereas a sign can be verified by both that person and others. For example, skin redness is a sign. Syndrome A set of signs or a series of events occurring together that make up a disease or health problem. Syndrome X/Metabolic syndrome See: Metabolic syndrome. Syringe Systemic Conditions that affect the entire body. Diabetes is a systemic disease because it involves many parts of the body such as the pancreas, eyes, kidneys, heart, and nerves. Systolic blood pressure See: Blood pressure.
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 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.