This is a working overview of nuclear receptor, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-11-16 and is reviewed periodically as new material appears.
Because cardarine is not an approved medicine, no pharmacopeial monograph defines its identity, purity, or storage requirements. Laboratories typically rely on in-house methods and reference standards when testing materials labeled as GW501516. Certificates of analysis may report purity and identity for a specific batch, but their scope varies and they do not guarantee safety or legal status. Independent verification can include high-performance liquid chromatography, mass spectrometry, nuclear magnetic resonance, and elemental analysis. The distinction between research chemical labeling and human use is significant because quality standards and oversight differ.
Cardarine can be detected in biological samples and product materials using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The method separates compounds by chromatography and identifies them by mass-to-charge transitions, allowing low-level detection in urine or blood. Sample preparation often involves enzymatic hydrolysis, solid-phase extraction, or protein precipitation. Certified reference materials and isotope-labeled internal standards improve quantification. Detection windows depend on metabolism, matrix, and assay sensitivity, so no single universal window applies.
Regulatory treatment of cardarine differs by context and jurisdiction. In competitive sport, the World Anti-Doping Agency lists PPARδ agonists, including GW501516, as prohibited at all times. Outside sport, it lacks approval as a prescription medicine in major drug markets, and products sold for human consumption may be treated as unapproved drugs. Some countries also restrict importation or sale through general consumer protection and medicines laws. These classifications affect availability, testing, and legal risk without establishing therapeutic value.
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 |
|---|---|---|
| WADA classification | S4 Hormone and Metabolic Modulators | Prohibited at all times in sport. |
| Drug approval status | Not approved in major jurisdictions | No accepted therapeutic indication. |
| Common detection method | LC-MS/MS | Detects parent compound and metabolites. |
| Typical test matrix | Urine or blood | Urine is common in anti-doping testing. |
| Product labeling | Research chemical or supplement | Often not independently verified. |
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
Laboratory studies have examined GW501516 in cell cultures and rodents for conditions such as dyslipidemia, insulin resistance, and obesity. Some trials in humans were initiated, but development was discontinued after preclinical findings raised concerns about cancer in certain models. Those findings do not prove that the compound causes cancer in people, but they contributed to regulatory caution. Later reviews often describe the evidence as preliminary and insufficient for assessing long-term safety.
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 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.
critical point The end point of a phase equilibrium curve or pressure-temperature curve at which conditions are such that phase boundaries vanish and a substance's different phases, such as liquid and vapor, can coexist. The critical point is defined by the intersection of a critical temperature, Tc, and a critical pressure, pc; above this temperature and pressure, all distinction between phases disappears and the substance becomes a supercritical fluid.
For services to the community in Hockley Heath, West Midlands. Josephine Parkin. For services to the community in Wakefield, West Yorkshire. Rachel Frances Parkinson. For services to the community in Whitefield, Greater Manchester during Covid-19. Bryony Emily Kate Peall. For services to the community in Saxmundham, Suffolk during Covid-19. Diana Marian Pearman. For services to the community in Sonning Common, Oxfordshire. Michelle Louise Pearse. Quality and Business Support Manager, Nuclear Decommissioning Authority. For services to Education and to the community in West Cumbria. Pearl Ann Pearson-Brooke. For services to the community in Martham, Great Yarmouth, Norfolk. Doreen May Peck. For services to the community in Ashtead, Surrey. Captain (Rtd) Michael Neville Pemberton. Chief Executive Officer, Building Extraordinary Communities. For services to Regeneration and to the community in Cumbria. Michael James Penston. For services to the community in Southampton, Hampshire, during Covid-19. Betty Philipson. President, City Road Club (Hull). For services to Cycling and to the community in the East Riding of Yorkshire. Bryan Phillips. Volunteer, Irish Guards Association. For services to Armed Forces Charities in Northern Ireland. Malson Phillips. Chair, South Wales Shire Horse Society. For services to Conservation. Sukhdev Singh Phull. Engineer, Department for Transport. For services to Transport Technology and for charitable services through the Ekom Charity Trust. Brian Pilgrim. Lately Whitehall Area Workplace Services Manager, Government Property Agency.
== Awards == 2025 Fellow of the American Society for Mass Spectrometry 2024 The Analytical Scientist The Power List - Instrumental Innovators 2023 The Analytical Scientist The Power List - Innovators and Trailblazers 2022 American Society for Mass Spectrometry Biemann Medal 2022 International Mass Spectrometry Foundation Curt Brunnée Award 2021–2022 North Carolina State University Faculty Scholar 2021 The Analytical Scientist The Power List 2021 North Carolina State University Impact Scholars 2019 The Analytical Scientist The Power List 2017 Women Chemists Committee of the American Chemical Society Rising Star Award
== Pharmacokinetics == Famotidine has a delayed onset of action, beginning after 90 minutes. However, famotidine has a duration of effect of at least 540 minutes (9.0 h). At its peak effect, 210 minutes (3.5 h) after administration, famotidine reduces acid secretion by 7.3 mmol per 30 minutes.
Sources: en.wikipedia.org
Fluorescent labeling is known for its non-destructive nature and high sensitivity. This has made it one of the most widely used methods for labeling and tracking biomolecules. Several techniques of fluorescent labeling can be utilized depending on the nature of the target.
7 December Storm Darragh: Hundreds of thousands are left without power, while travel is disrupted and many planned events are called off, as winds of up to 93 mph (150 km/h) hit much of the UK, along with heavy rain. A rare red weather warning is in place in Wales and south-west England, meaning the storm poses a risk to life. The deaths of two men are reported, in Birmingham and Lancashire, due to trees falling on vehicles. A 61-year-old Elizabeth line worker dies following a serious assault at Ilford railway station on 4 December. A 28-year-old man is charged with grievous bodily harm, affray, and possession of a prohibited offensive weapon. 8 December Prime Minister Sir Keir Starmer welcomes the Fall of the Assad regime in Syria, which he describes as "barbaric", and calls for the restoration of "peace and stability". Emma Pinchbeck, the new chief executive of the UK government's Climate Change Committee, says the UK is "not ready" for the kind of extreme weather brought by Storm Darragh. Prince William helps to serve lunch at The Passage, a London-based homeless charity he first visited with his mother as a boy. 9 December – The UK pauses asylum claims from Syrian refugees following the overthrow of Bashar al-Assad. 10 December The UK government recommends a 2.8% pay rise for public sector workers from April 2025. In response, the Unison trade union describes the offer as "barely above the cost of living". King Charles III presents the first Elizabeth Emblems, recognising public servants such as police officers and firefighters who died while on duty.
== External links == JPL Develops High-Speed Test to Improve Pathogen Decontamination at the Wayback Machine (archived 2016-03-04) at JPL. Spotting Spores at the Wayback Machine (archived 2016-03-04) at Astrobiology Magazine.
Sources: en.wikipedia.org
=== Moondust: Knuckles Tech Demos === Moondust: Knuckles Tech Demos is a tech demo created for the Valve Index controllers which is set in the Portal universe. The game was released on Steam on June 21, 2018, however it is unlisted.
== Interactions == Interactions are important for SGLT2 inhibitors because most people with type 2 diabetes are taking many other medications. Gliflozins appear to increase the diuretic effect of thiazides, loop diuretics and related diuretics and may increase the risk of dehydration and hypotension. It is important to adjust the dose of antidiabetics if the treatment is combination therapy to avoid hypoglycemia. For example, interactions with sulfonylureas have led to severe hypoglycemia presumably due to cytochrome P450.
== See also == Breeding back – A form of selective breeding to recreate the traits of an extinct species, but the genome will differ from the original species Carcinisation – Evolution of crustaceans into crab-like forms Contingency (evolutionary biology) – effect of evolutionary history on outcomes Elvis taxon – Misidentification of later taxon superficially resembling earlier extinct taxon Incomplete lineage sorting – Characteristic of phylogenetic analysis: the presence of multiple alleles in ancestral populations might lead to the impression that convergent evolution has occurred Morphology (biology) – Study of external forms and structures of organisms Orthogenesis (contrastable with convergent evolution; involves teleology) Vavilovian mimicry – Type of biological mimicry in plants Polyphyly – Property of a group not united by common ancestry Recurrent evolution – Repeated evolution of a particular trait
In May 2013, Doug Matthews set an altitude record of 12,975 m (42,568 ft) in a P-51 named The Rebel for piston-powered aircraft weighing 3,000 to 6,000 kg (6,600 to 13,200 lb). Flying from a grass runway at Florida's Indiantown airport and over Lake Okeechobee, Matthews set world records for time to reach altitudes of 9,000 m (30,000 ft), 18 minutes and 12,000 m (39,000 ft), 31 minutes. He set a level-flight altitude record of 12,200 m (40,100 ft) in level flight and an absolute altitude record of 13,000 m (42,500 ft), breaking the previous record of 11,248 m (36,902 ft) set in 1954.
Sources: en.wikipedia.org
Anti-doping laboratories typically use LC-MS/MS to detect GW501516 and its metabolites in urine. The method is sensitive and can identify the compound at low concentrations. Detection depends on sample timing, metabolism, and the specific assay.
Legality varies by country and context. It lacks marketing approval as a medicine in major countries. Sports organizations prohibit its use at all times.
A certificate of analysis may report identity, purity, and testing methods for a specific batch. It does not guarantee safety or legal status. Independent verification can confirm whether the material matches the label.
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.