This is a working overview of GW501516, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-10-01. Anything still debated is marked as such rather than presented as settled.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | PPARδ agonist | Not an anabolic steroid. |
| Common synonyms | GW501516, GW-1516 | Cardarine is an informal name. |
| Appearance | White to off-white powder | Typical for research-grade solid. |
| Solubility class | Poorly soluble in water; soluble in some organic solvents | Such as DMSO or ethanol in laboratory settings. |
| Typical storage temperature | Cool, dry, protected from light | Specific conditions vary by supplier and form. |
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.
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.
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.
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.
=== Post-production === The filmmakers experimented with the visuals of Mega-City One, including the design and positioning of the city's tower blocks, to create the impression that the city had risen out of the remains of another. They found that replicating the comic visuals of blocks close together made the blocks appear small. Instead, they allowed more space between the buildings to emphasise the larger buildings and allow for the presence of roads and cars to allow for extrapolation outside of the picture. Outcrops and appendages were added to break up the buildings' straight lines. On 7 October 2011, the Los Angeles Times reported that Travis was prohibited from participating in the editing process following creative disagreements between producers and executives. Garland took over the editing process; his contribution was considered significant enough for him to seek a co-director credit—a situation considered unusual as Garland had never directed a film before and had not been in charge of any filming. The disagreement concerned a disapproval over the footage that Travis was providing. Although Travis was removed from the editing process, he was monitoring the progress of the film. On 10 October, Travis and Garland released a joint statement saying that they had agreed on an "unorthodox collaboration" before production began, that Travis was still involved in the film and that Garland was not seeking a co-director credit. In March 2018, Urban said that he believed Dredd should be considered Garland's directorial debut.
=== American Hospital Association (AHA) === The American Hospital Association has expressed concern that FDA's proposal to classify LDTs as medical devices exceeds the agency's appropriate regulatory scope, urging the FDA to continue to apply its enforcement discretion to hospital and health system LDTs and defer regulation of these tests mainly to CMS's strict CLIA oversight, the CAP accreditation and state law. The organization has called on Congress to either exclude hospitals and health systems from this device classification framework or to modernize LDT oversight in a way that promotes innovation while maintaining test accessibility, safety, and effectiveness.
== Career == At the institute, later Rockefeller University, he worked as an Assistant for Dr. D.W. Woolley on a dinucleotide growth factor he discovered in graduate school and on peptide growth factors that Woolley had discovered earlier. These studies led to the need for peptide synthesis and, eventually, to the idea for solid phase peptide synthesis (SPPS) in 1959. In 1963, he was sole author of a classic paper in the Journal of the American Chemical Society in which he reported a method he called "solid phase peptide synthesis". This article is the fifth most cited paper in the journal's history. In the mid-60s Dr. Merrifield's laboratory first synthesized bradykinin, angiotensin, desamino-oxytocin and insulin. In 1969, he and his colleague Bernd Gutte announced the first synthesis of the enzyme ribonuclease A. This work proved the chemical nature of enzymes. Dr. Merrifield's method greatly stimulated progress in biochemistry, pharmacology and medicine, making possible the systematic exploration of the structural basis of the activities of enzymes, hormones and antibodies. The development and applications of the technique continued to occupy his laboratory, where he remained active at the bench until recently. In 1993, Jeffrey I. Seeman published Life during a Golden Age of Peptide Chemistry, Merrifield's autobiography, in the series "Profiles, Pathways, and Dreams" for the American Chemical Society. He received the Association of Biomolecular Resource Facilities Award for outstanding contributions to Biomolecular Technologies in 1998.
==== United States of America ==== The U.S. Drug Enforcement Administration issued a temporary order for the classification of desmetramadol in schedule 1 of the Controlled Substances Act for the period of August 12, 2026 through August 12, 2028.
Fuel prices across North America have gone up significantly, beginning in early March, due to the market conditions shifting rapidly as the crisis continues. Liquefied natural gas prices have largely remained the same since the beginning of the energy crisis due to the lack of connectivity in the North American liquefied natural gas market, with minimal pipelines and export points. Gas prices have risen $1.16 a gallon in the United States since the start of the war, with prices expected to hit $5.00 a gallon if the Strait of Hormuz is not opened by mid-April. In California, a state heavily reliant on energy imports from Asia, gasoline prices surpassed $6 a gallon in seven counties as of March 30. In Canada, gas prices have risen approximately 30 percent from March to April. Jet fuel in North America has spiked 95 percent since the war began, causing multiple airlines to raise prices for checked baggage. Shipping services, such as the United States Postal Service, Amazon, and FedEx implemented fuel surcharges. On 24 April, U.S. exports of crude and petroleum products rose to nearly 12.9 million barrels a day. On 2 May 2026, Spirit Airlines ceased all operations citing rising fuel costs despite the Trump administration's attempts to save the company. In September 2026, Costco began rationing motor oil to two boxes per customer per week. The Strategic Petroleum Reserve fell to its lowest levels since November 1982 as 172 million barrels were planned to be drawn down.
Sources: en.wikipedia.org
Sulfur can also be removed from fuels before burning, preventing formation of SO2 when the fuel is burnt. The Claus process is used in refineries to produce sulfur as a byproduct. The Stretford process has also been used to remove sulfur from fuel. Redox processes using iron oxides can also be used, for example, Lo-Cat or Sulferox. Fuel additives such as calcium additives and magnesium carboxylate may be used in marine engines to lower the emission of sulfur dioxide gases into the atmosphere.
Waffle House has developed into a cultural icon. Part of Waffle House's fame is that they are prominent along Interstate highways in the South. A now defunct GeoCities website, The Waffle House Shrine, hosted employee and customer comments about their experiences with Waffle House. Waffle House has become known as an Internet meme for viral videos of fights on its premises, which have been attributed to the combination of being open 24/7 and its customers often being under the influence of alcohol, though this reputation has been described as a self-fulfilling prophecy with similar violence regularly taking place in other retail outlets.
The services and research activities at Genetics & IVF have been the subject of articles in newspapers, such as the New York Times. In 1998, the Institute opened a branch facility in Shanghai, China. The Institute's American activities involve a large donor egg program, a group of sperm banks and egg banks, preimplantation genetics testing centers, and oocyte cryopreservation via vitrification in addition to more conventional IVF, infertility, and genetic services.
Aβ is the main component of the kind of amyloid plaques that form in the brains of people with Alzheimer's disease. Aβ can also form the deposits that line cerebral blood vessels in cerebral amyloid angiopathy. The plaques are composed of aggregated Aβ oligomers called amyloid fibrils, a protein fold shared by other peptides such as the prions associated with protein misfolding disease, also known as proteinopathy.
Sources: en.wikipedia.org
Cardarine is commonly known as GW501516 or GW-1516. These names refer to the same synthetic compound. It is not a brand-name approved medicine.
No, cardarine is not a steroid. It is classified as a PPARδ agonist. Its structure and receptor target differ from anabolic steroids.
No regulatory agency has approved cardarine as a medicine. It was investigated in early research but development was discontinued. It is not available as a prescription drug.
Legal status varies by country. It is not approved as a medicine, and it is prohibited in sport. Some jurisdictions restrict import, sale, or possession.