Everything below concerns LC-MS/MS. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-05-05. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport; not approved as medicine | Listed by WADA at all times. |
| Common synonyms | GW501516, GW-501516, endurobol | Cardarine is a colloquial name. |
| Typical analytical method | LC-MS/MS | Detects parent compound and metabolites. |
| Common test matrix | Urine | Blood and dried blood spots also possible. |
| Legal classification | Varies by country | Often treated as unapproved drug or research chemical. |
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.
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 synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
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.
== External links == "Cyanogen Bromide MSDS Number: C6600". J. T. Baker. 1996-08-12. Teeri, A. E. (1948). "Thiamine and the Cyanogen Bromide Reaction". Journal of Biological Chemistry. 173 (2): 503–505. doi:10.1016/S0021-9258(18)57422-6. PMID 18910706.
Nando's (; Afrikaans: [ˈnandœs]) is a South African multinational fast casual restaurant chain that specialises in Portuguese flame-grilled, peri-peri style chicken. The name is derived from a nickname for the male given name Fernando, in reference to one of the company's founders. Founded in Johannesburg in 1987, Nando's operates over 1,200 outlets in 30 countries. Their logo depicts the Rooster of Barcelos, one of Portugal's most common symbols. The company was wholly owned by Dick Enthoven until his death in 2022, and is now owned by his family.
Locals are "Districts"; national convention meets quadrennially; headquarters in Pittsburgh; in 1979 had $120,000,000 in insurance; also sponsored outings, baseball games, etc. While originally for German men and women, by 1979 the Union was open to men and women of all ethnic backgrounds. In 1923 the Union had 54,000 members, 50,000 in 1965, and 37,000 in 1979. Improved Order, Knights of Pythias Independent Order of Red Men North American Swiss Alliance - Founded July 14, 1865, as the Grütli Bund der Vereinigten Staaten von Nord Amerika in Cincinnati. Became Nordamerikanishcher Schweizerbund in July 1911. National convention meets quadrennially, locals are called branches or lodges. Open to Swiss, Swiss descendants, or spouses of Swiss. Membership 2,000 in 1965, 4,000 in 1978 and 3,350 in 1994, about 10 to 15% are social, uninsured members. Periodical originally called Gruetlianer changed to Der Schweizer in 1911. Headquarters in Cleveland in 1979, but it was an "organization on wheels" moving to several places every few years in the late 19th century Schwarzer Ritter, Deutscher Orden - Claimed great antiquity, though in 1899 it was said to have been present in the United States for about 30 years. Active in New York, New Jersey, Pennsylvania, and the District of Columbia. Sons of Hermann United League of America Workmen's Benefit Fund - Founded as the Workmen's Sick and Death Benefit Fund in 1884, this organization was licensed to provide insurance in February 1899. The current name was adopted in 1939. Membership opened to non-Germans in 1976.
Sources: en.wikipedia.org
While teens may dislike certain aspects of Facebook, such as excessive sharing, they continue to use it because participation is important in terms of socializing with peers. Teens typically keep their Facebook accounts private and make their Twitter accounts public, partly because of the number of adults on the former. Speed and reliability are important factors in choice of social networking platform. This need for quick communication is apparent in the popularity of apps like Vine or Snapchat and the prevalent use of emojis. By the early 2020s, TikTok has become one of the most popular social networks among teenagers and young adults, who frequently use it as a news source and a search engine. Young Americans are willing to ignore their own government's concerns over issues of user privacy and national security, as well as a possible nationwide ban. A notable number of people from Generation Z are the subject of their parents' social media posts. As they grow older, they have opinions about pictures or videos of them being posted online. While some parents do ask for their children's permission before posting, at least some of the time, others simply disregard what their children think. A 2010 report by cybersecurity firm AVG stated that an absolute majority of American children under the age of two had a digital footprint and one in three had their information and photographs posted online within weeks after they were born.
== Good clinical data management practice == Good clinical data management practice (GCDMP) is the current industry standards for clinical data management that consist of best business practice and acceptable regulatory standards. In all phases of clinical trials, clinical and laboratory information must be collected and converted to digital form for analysis and reporting purposes. The U.S. Food and Drug Administration and International Conference on Harmonisation of Technical Requirements for Registration of Pharmaceuticals for Human Use have provided specific regulations and guidelines surrounding this component of the drug and device development process. The effective, efficient and regulatory-compliant management of clinical trial data is an essential component of drug and device development. The Society for Clinical Data Management (SCDM) has created the Good Clinical Data Management Practices (GCDMP©) standard, a comprehensive document that provides guidance on accepted practices of clinical data management (CDM) that are not totally covered by current guidelines and regulations. This document is updated by Subject Matter Experts on a continuous basis.
Analytical application of the radiotracer method is a forerunner of isotope dilution. This method was developed in the early 20th century by George de Hevesy for which he was awarded the Nobel Prize in Chemistry for 1943. An early application of isotope dilution in the form of radiotracer method was determination of the solubility of lead sulphide and lead chromate in 1913 by George de Hevesy and Friedrich Adolf Paneth. In the 1930s, US biochemist David Rittenberg pioneered the use of isotope dilution in biochemistry enabling detailed studies of cell metabolism.
Sources: en.wikipedia.org
== Advantages == Although fluorescent dyes may not have the same sensitivity as radioactive probes, they are able to show real-time activity of molecules in action. Moreover, radiation and appropriate handling is no longer a concern. With the development of fluorescent tagging, fluorescence microscopy has allowed the visualization of specific proteins in both fixed and live cell images. Localization of specific proteins has led to important concepts in cellular biology such as the functions of distinct groups of proteins in cellular membranes and organelles. In live cell imaging, fluorescent tags enable movements of proteins and their interactions to be monitored. Latest advances in methods involving fluorescent tags have led to the visualization of mRNA and its localization within various organisms. Live cell imaging of RNA can be achieved by introducing synthesized RNA that is chemically coupled with a fluorescent tag into living cells by microinjection. This technique was used to show how the oskar mRNA in the Drosophila embryo localizes to the posterior region of the oocyte.
In southwestern Germany, territorial revision seemed to be a top priority since the border between the French and American occupation zones was set along the Autobahn Karlsruhe-Stuttgart-Ulm (today the A8). Article 118 stated "The division of the territory comprising Baden, Württemberg-Baden and Württemberg-Hohenzollern into Länder may be revised, without regard to the provisions of Article 29, by agreement between the Länder concerned. If no agreement is reached, the revision shall be effected by a federal law, which shall provide for an advisory referendum." Since no agreement was reached, a referendum was held on 9 December 1951 in four different voting districts, three of which approved the merger (South Baden refused but was overruled, as the result of total votes was decisive). On 25 April 1952, the three former states merged to form Baden-Württemberg.
=== Peripheral edema and hypoalbuminemia === Kwashiorkor is a form of protein deficiency, which can result in both osmotic imbalances and irregularities in the lymphatic system. Kwashiorkor is most notable for peripheral edema. The presence of edema in kwashiorkor is correlated with very low albumin concentration (hypoalbuminemia). Edema results from a loss of fluid balance between the hydrostatic and oncotic pressures across the capillary blood vessel walls due to the lack of protein which affects the body's ability to draw fluid from the tissues into the bloodstream. Low albumin concentration influences negatively the strength of oncotic pressure. Failure leads to fluid buildup in the abdomen, resulting in edema and belly distension. Furthermore, the release of antidiuretic hormone is stimulated by hypovolemia, also leading to the development of peripheral edema. Plasma renin is also stimulated, promoting sodium retention. It is important to distinguish the pathophysiology of marasmus and kwashiorkor when it comes to treating malnourished children who may have hypovolemic shock that is caused by an acute loss of salt and water. Children with severe albumin deficiency struggle physiologically to maintain their blood volume.
=== Viral coat proteins === There are five families of viral coat proteins in which processing occurs at an asparagine residue. These five families are included in three clans: Clan NA (Families N1, N2 and N8), clan NC (Family N7) and clan NE (Family N5). Family N1: The known autolytic cleavage is mediated by the nodavirus endopeptidase, from the C-terminus of the coat protein and only occurs within the assembled virion. Family N2: Includes tetraviruses endopeptidases. The known autolytic cleavage is from the C-terminus of the coat protein. The cleavage occurs during the late stages of virion assembly. Family N8: The known autolytic cleavage is in poliovirus VP0 viral capsid protein into VP2 and Vp4 in the provirion. Family N7: The known autolytic cleavage is from the N-terminus of the coat protein. Family N5: The known autolytic cleavage is from the N-terminus of the coat protein.
Sources: en.wikipedia.org
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.
Laboratories use liquid chromatography-tandem mass spectrometry to detect GW501516 and its metabolites. Urine is commonly tested, and testing can occur in and out of competition.
No, cardarine is not a SARM. It is a PPARδ agonist, which acts on a different receptor. The two classes are often confused in online discussions.
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.