Prohibited substance comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2025-09-05. 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.
Laboratory detection of GW501516 commonly uses liquid chromatography coupled with tandem mass spectrometry. The method can identify the parent compound or its metabolites in urine and blood after sample cleanup. Protein precipitation, solid-phase extraction, or enzymatic hydrolysis may precede analysis, depending on the matrix. Reference standards are required for accurate quantification and confirmation. Because the compound is not approved, testing often occurs in anti-doping, forensic, or research settings rather than routine clinical care. Results are reported with limits of detection and quantification.
Stability of GW501516 depends on form, temperature, light exposure, and moisture. Solid reference material is typically stored frozen or refrigerated in a desiccator and protected from light. Solutions in organic solvents such as dimethyl sulfoxide are often kept frozen in aliquots to reduce freeze-thaw cycling. Aqueous solubility is low, so aqueous stock solutions can be difficult to prepare without cosolvents. Degradation may appear as changes in chromatographic purity or mass spectral signal. Stability studies are needed to establish shelf life for any specific preparation.
Quality assessment for cardarine samples usually combines identity, purity, and impurity testing. Nuclear magnetic resonance spectroscopy and mass spectrometry can confirm molecular structure, while high-performance liquid chromatography estimates purity. Certificates of analysis from testing laboratories may list these results, but they do not establish safety or legality. In the absence of approved manufacturing, products sold online may contain the wrong compound, variable amounts, or unlisted contaminants. Independent verification is therefore central to analytical work and to interpreting any reported biological activity.
| 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 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.
Laboratory detection of cardarine typically involves sample preparation followed by chromatographic separation and mass spectrometric identification. Urine is the most common matrix for anti-doping tests, though blood and hair have also been explored. Methods can target the parent compound or its metabolites, depending on the expected window of detection. Reference standards are required for accurate quantification. Matrix effects and dilution can influence results, so laboratories use internal standards and validation protocols. The exact detection window varies with dose, route, and individual metabolism.
A common misconception is that cardarine has been proven safe for human use. In reality, human clinical data are limited, and long-term animal studies have raised concerns about cancer. Another misconception is that it is a supplement or vitamin-like compound. It is a synthetic research chemical with no approved medical indication. Scientific discussion often focuses on its mechanism and detection rather than therapeutic use. Regulatory and anti-doping literature treats it primarily as a prohibited substance.
In April 2023, President Lula began his four-day trip during which he called Portugal relations with Brazil "extraordinary" and stated that "Portugal is not simply a foreign country but our home extension". In the 13th Brazil-Portugal Summit the countries signed several agreements such as a mutual recognition of professional degrees, driver's licenses, rights of persons with disabilities and a witness protection programme in both countries. Other agreements signed during the visit include education, science, tourism, energy and audiovisual areas. Lula also attended a high-level Brazilian-Portuguese business meeting in Matosinhos in which Brazilian aerospace giant Embraer and four Portuguese companies (OGMA, EMPORDEF, GMVIS Skysof and CEiiA) announced a deal to build a Brazilian-designed aircraft. Also in the meeting, Prime Minister António Costa announced Portugal companies EDP and Galp will be investing a total of €5.7 billion in projects in Brazil over the next years. On 24 April, Lula took part in a ceremony at the Queluz Palace to award Brazilian singer and songwriter Chico Buarque the Camões Prize.
==== Pain circuitry ==== The outcome of NOP activation on the brain's pain circuitry is site-specific. Within the central nervous system its action can be either similar or opposite to those of opioids depending on their location. In animal models, activation of NOP in the brain stem and higher brain regions has mixed action, resulting in overall anti-opioid activity. NOP activation at the spinal cord and peripheral nervous system results in morphine-comparable analgesia in non-human primates.
From the late 18th century it became apparent that a crystal of a substance was composed of units, whether thought of as atoms, ions, molecules, or polyhedra, in a regular spatial arrangement, termed its crystal structure. The most notable early theory for crystal structures was that of René Just Haüy. In 1801 Haüy, published his Traité de Minéralogie in four volumes, the last of which was an atlas of plates which was considered "among the most wonderful of the 19th century". It has been described as "a work of comprehensive insight, and much of it, written with literary fluency". In this work Haüy described how the law of rational indices establishes relationships between the orientations of the crystal faces, and explains that crystalline solids are formed by replicas of what would now be considered a unit cell. Haüy's theory called for fixed mineral species (based on their molécule intégrante), fixed crystal morphology, and constant chemical composition. This was a mineralogical equivalent to the law of definite proportions in chemistry. John G. Burke (1966) and Hans-Werner Schütt (1984) proposed Haüy's crystal structure theory as an example of a paradigm in the sense of The Structure of Scientific Revolutions by Thomas S. Kuhn (1962). In 1822 Haüy published Traité de Cristallographie an updated version of his work of 1801.
Sources: en.wikipedia.org
Stephen Dank (born c. 1963) is an Australian biochemist who worked as a sports scientist at several professional sports club. He is known for his key role in two major sports drug cheating scandals, the Essendon Football Club supplements saga and the Cronulla-Sutherland Sharks supplements saga, where he injected players with illegal substances to improve their performance. He is known for his unorthodox treatment and diagnostic methods, including using calf blood and profiling players' DNA. Des Hasler described Dank as 'a great analytical thinker', in particular highlighting his contributions in the area of GPS application, statistical science, and altitude simulation training. In light of his unorthodox treatment methods, in November 2016 Dank was given a life-long ban from association with the Australian Football League. On 28 November 2016, the Australian Sports Anti-Doping Authority (ASADA), (known as Sport Integrity Australia since July 1 2020), officially acknowledged the decision of the AFL Appeal Board He worked with National Rugby League clubs the Manly Sea Eagles and Cronulla Sharks and Australian rules football clubs, Essendon Football Club and the Gold Coast Suns.
The Beltrán-Leyva Cartel was founded by the four Beltrán Leyva brothers: Marcos Arturo, Carlos, Alfredo and Héctor. In 2004 and 2005, cartel leader Arturo Beltrán Leyva led groups of enforcers to compete for trafficking routes in northeastern Mexico against the Sinaloa Cartel. The Beltrán-Leyva Cartel infiltrated Mexico's political, judicial, and police institutions, including the Interpol in Mexico, to feed classified information about anti-drug operations against its rivals. Following the 2009 killing of Arturo Beltrán Leyva, the cartel entered into an internal power struggle between Arturo's brother, Héctor Beltrán Leyva, and his top enforcer Edgar Valdez Villarreal. Meanwhile, the cartel continued to dissolve with factions such as the South Pacific Cartel, La Mano Con Ojos, Independent Cartel of Acapulco, and La Barredora forming and the latter two cartels starting yet another intra-Beltrán Leyva Cartel conflict. The Mexican Federal Police considers the cartel to have been disbanded, and their last leader, Héctor Beltrán Leyva, was captured in October 2014.
==== Gamma Spectroscopy ==== Gamma spectroscopy yields results that are conceptually equivalent to alpha-particle spectroscopy, however, can result in sharper peaks due to reduced attenuation of energy. Some radionuclides produce discrete γ-rays that produce energy between a few KeV to 10 MeV which can be measured with a gamma-ray spectrometer. This can be accomplished without destroying the sample. The most common gamma-ray detector is a semiconductor germanium detector which allow for a greater energy resolution than alpha-particle spectroscopy, however gamma spectroscopy only has an efficiency of a few percent. Gamma spectroscopy is a less sensitive method due to low detector efficiency and high background. However, gamma spectroscopy has the advantage of having less time-consuming sample procedures and portable detectors for field use.
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.
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.