If you have been reading about metabolite and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-10-22. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 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 |
|---|---|---|
| Common name | Cardarine | Common internet and media name. |
| Research code | GW501516 | Also written GW-1516. |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator. |
| Development status | Discontinued | Clinical development halted after rodent cancer findings. |
| Regulatory status | Prohibited in sport | Listed by WADA; not approved as medicine. |
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.
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.
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.
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.
== See also == Torricelli's law Coandă effect Euler equations – for the flow of an inviscid fluid Hydraulics – applied fluid mechanics for liquids Navier–Stokes equations – for the flow of a viscous fluid Teapot effect Terminology in fluid dynamics
== Function == In myocytes, sarcomeres adhere to the sarcolemma via costameres, which align at Z-discs and M-lines. The two primary cytoskeletal components of costameres are desmin intermediate filaments and gamma-actin microfilaments. It has been shown that gamma-actin interacting with another costameric protein dystrophin is critical for costameres forming mechanically strong links between the cytoskeleton and the sarcolemmal membrane. Additional studies have shown that gamma-actin colocalizes with alpha-actinin and GFP-labeled gamma actin localized to Z-discs, whereas GFP-alpha-actin localized to pointed ends of thin filaments, indicating that gamma actin specifically localizes to Z-discs in striated muscle cells. During development of myocytes, gamma actin is thought to play a role in the organization and assembly of developing sarcomeres, evidenced in part by its early colocalization with alpha-actinin. Gamma-actin is eventually replaced by sarcomeric alpha-actin isoforms, with low levels of gamma-actin persisting in adult myocytes which associate with Z-disc and costamere domains. Insights into the function of gamma-actin in muscle have come from studies employing transgenesis. In a skeletal muscle-specific knockout of gamma-actin in mice, these animals showed no detectable abnormalities in development; however, knockout mice showed muscle weakness and fiber necrosis, along with decreased isometric twitch force, disrupted intrafibrillar and interfibrillar connections among myocytes, and myopathy.
=== Government and NGO reports === National Drug Threat Assessment 2009 from the United States Department of Justice War On Drugs: Legislation in the 108th Congress and Related Developments, a 2003 report from the Congressional Research Service via the State Department website The Report of the Canadian Government Commission of Inquiry into the Non-Medical Use of Drugs – 1972 Drug Enforcement Administration (2017), Drugs of abuse: A DEA resource guide (PDF) (2017 ed.), Washington, D.C.: Author, archived from the original (PDF) on December 3, 2016, retrieved January 23, 2018 Revealing the missing link to Climate Justice: Drug Policy, a 2023 report from the International Coalition on Drug Policy Reform and Environmental Justice
Sources: en.wikipedia.org
=== Treatment === The opioid epidemic is often discussed in terms of prevention, but helping those who are already addicted is addressed less frequently. Opioid dependence can lead to a number of consequences like contraction of HIV and overdose. For addicted persons who wish to treat their addiction, there are two classes of treatment options available: medical and behavioral. Neither is guaranteed to successfully treat opioid addiction. Which treatment, or combination of treatments, is most effective varies from person to person. These treatments are doctor-prescribed and -regulated, but differ in their treatment mechanism. Popular treatments include kratom, naloxone, methadone, and buprenorphine, which are more effective when combined with a form of behavioral treatment. Accessing treatment, however, can be difficult. The strict regulation of opioid treatment programs dates back to the early 20th century. Before 1919, physicians prescribed milder forms of opiates to help wean patients off opium. In Webb v. United States, the Supreme Court ruled that doctors could no longer prescribe narcotics to aid in treating a narcotic use disorder. Thus, morphine dispensaries emerged in communities to fill the treatment gap and were the early precedents to modern methadone clinics. It is still difficult for providers to prescribe opioids for medication-assisted treatment despite the data that show individuals addicted to opioids have better outcomes with that than abstinence-based treatment programs.
== History == Charles River was founded in 1947 by Henry Foster, a young veterinarian who purchased one thousand rat cages from a Virginia farm and set up a one-person laboratory in Boston overlooking the Charles River. He supplied local researchers with laboratory animals. In 1955, the company's headquarters were relocated to their current home in Wilmington, Massachusetts. The organization became an international entity in 1966 by opening a new animal production facility in France. The first commercial, comprehensive genetic monitoring program was implemented by Charles River in 1981. Three years later, they were acquired by Bausch & Lomb. In 1988, the organization began creating transgenic mice and rats. In the 1990s, they began in vitro endotoxin testing. In the 1990s, Jim Foster bought Charles River back from Bausch & Lomb, and the company later went public on the New York Stock Exchange. Charles River launched the Humane Care Imperative in 2002, designed to raise awareness and train employees on animal welfare's importance. The same year, they were named "Company of the Year" by The Boston Globe. The company introduced preconditioning services in 2005 to provide customers with study-ready animals. In 2008, Charles River signed a ten-year contract to partner with the National Cancer Institute and opened a facility in Frederick, Maryland. In April 2019, Charles River announced it would cease its San Diego operations, moving the breeding of rodents for testing compounds to Hollister, California.
At this tungsten element the non-refractory components of the particle beam are flash vaporized and then ionized by EI. Once ionized, the sample can be analyzed with either a quadruple (Q), time-of-flight (ToF), or high-resolution (HR)-ToF mass analyzer.
Sources: en.wikipedia.org
=== Marienwerder / Kwidzyn Plebiscite Area === Parts of the Marienwerder Government Region were confined as the Marienwerder Plebiscite Area. The commission for the plebiscite area reached Marienwerder (Kwidzyn) on 17 February 1920. Upon its arrival, it found an Italian battalion of Bersaglieri on guard that then marched past at the double. The commission had about 1,400 uniformed German police under its authority. Beaumont was accused by Poles of having a cold and ironic attitude toward them.
ribose A monosaccharide sugar which, as D-ribose in its pentose ring form, is one of three primary components of the ribonucleotides from which ribonucleic acid (RNA) molecules are built. Ribose differs from its structural analog deoxyribose only at the 2' carbon, where ribose has an attached hydroxyl group that deoxyribose lacks.
=== Taxpayer Bill of Rights === In 1998, Kennedy advocated for the passage of Act 136, a bill that established a Taxpayer's Bill of Rights. The bill guaranteed that taxpayers would be treated with respect, have access to instructions "written in plain English", receive quick responses to questions from the Department of Revenue, and receive notice if they were in violation of the tax policy, among other things. Kennedy used the Taxpayer's Bill of Rights as a foundation to advocate for more tax code changes. In 1999, he proposed tax code changes that would protect people from prosecution for tax crimes that their spouses committed without their knowledge. He also proposed "Fair Interest" policies that halted the accrual of interest on tax liabilities held by people whom the Department of Revenue did not notify were in violation of state tax policy. Kennedy said the efforts helped ensure Louisiana residents had a tax system that was as "fair, easy, and convenient as possible", adding, "We look upon taxpayers as our customers...not our enemies."
== List == The Madras Presidency, based at Fort St. George, was a presidency of India that was established in 1652 by the English East India Company to be the headquarters of the English settlements on the Coromandel Coast. The territory under the presidency consisted of the village of Madrasapattinam and its surrounding regions. After a series of wars including the Anglo-French wars, Anglo-Mysore wars, and Polygar wars, and the consequent alliance with the Nawab of Arcot, it was expanded to cover the region from the Northern Circars to Cape Comorin, and included present-day Tamil Nadu, the Malabar region of North Kerala, the coastal and Rayalaseema regions of Andhra Pradesh, and the Bellary, Dakshina Kannada, and Udupi districts of Karnataka. The Indian Councils Act 1861 set up the Madras Legislative Council as an advisory body, without powers, through which the colonial administration obtained advice and assistance from able and willing Indian leaders. However, the members were appointed and not elected by the public. With the enactment of the Government of India Act 1919, the first elected legislature was formed in 1920 after the general elections. The term of the legislative council was three years. It had 132 members, of whom 34 were nominated by the governor and the rest were elected. As per the Government of India Act 1935, a bicameral legislature was set up with a legislative assembly consisting of 215 members and a legislative council having 56 members. The first legislative assembly under this act was constituted in July 1937.
Sources: en.wikipedia.org
No. Cardarine is a PPARδ agonist, while selective androgen receptor modulators act on androgen receptors. The two classes differ in receptor target and downstream effects.
Preclinical rodent studies reported cancers, including liver and bladder tumors, at tested doses. The human relevance of those findings is uncertain, but development was discontinued. No approved human product resulted.
No. It remains an investigational compound without approved therapeutic labeling. Sports regulators prohibit its use, and health agencies have warned against consuming it.
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.