GW501516 raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-09-12. Anything still debated is marked as such rather than presented as settled.
Cardarine is a common name for GW501516, an investigational compound developed in the 1990s for metabolic conditions. It acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in lipid and energy metabolism. The compound is frequently mislabeled as a selective androgen receptor modulator, or SARM, but its molecular target is different. GW501516 reached early clinical testing before development was discontinued. It has no approved therapeutic use in any country. The name cardarine is not a formal international nonproprietary name.
Regulatory treatment varies, but cardarine is not approved as a medicine. Sports authorities list GW501516 as a prohibited substance, and it is banned at all times under the World Anti-Doping Agency code. Many countries restrict sales for human consumption, while online vendors market it as a research chemical. Such products may lack purity data, and their actual contents can differ from the label. Purchasing or possessing cardarine may carry legal consequences depending on jurisdiction. The compound is not a dietary supplement ingredient in regulated markets.
Clinical development stopped after rodent studies showed tumors at multiple sites. Whether those findings predict human cancer risk remains an open question, but they led sponsors to discontinue programs. Human safety data are limited to small, short-term studies that were not designed to assess cancer risk. Reported effects in those studies included changes in blood lipids, but the evidence is insufficient for medical use. Long-term consequences of nonmedical use are not well characterized. Questions about dose, duration, and individual susceptibility remain unresolved.
Cardarine is explicitly prohibited by the World Anti-Doping Agency under the class of PPARδ agonists. Its presence in urine or blood samples can be detected using mass spectrometry-based methods, often liquid chromatography-tandem mass spectrometry. Athletes who test positive may face sanctions, including bans from competition. The compound is also regulated as a prescription-only or unapproved drug in many countries. Enforcement varies by jurisdiction, and some regions treat it as a controlled substance. Online sales may occur despite these restrictions, creating quality and legal risks.
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.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516; GW-1516; endurobol | GW501516 is the research code |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator |
| Molecular formula | C21H18F3NO3S2 | Established chemical formula |
| Molar mass | 453.5 g/mol | Calculated from the formula |
| Regulatory status | Prohibited in sport; not approved as medicine | Status varies by country |
Safety concerns emerged from long-term animal studies. In rodents given the compound for extended periods, researchers found an increased incidence of certain cancers, including liver and bladder tumors. These findings contributed to the discontinuation of clinical development. Whether similar risks apply to short-term or low-level exposure in humans is not established, and controlled human safety data are limited. The relevance of high-dose rodent carcinogenicity findings to human use remains a subject of debate.
Human trials of GW501516 were small and short in duration. They examined lipid levels, glucose handling, and other metabolic markers, but the programs were halted after the animal cancer findings. No approved therapeutic product exists, and published human data are insufficient for establishing long-term safety. Reports of use for athletic performance come mainly from non-clinical settings and cannot be verified through controlled trials. Independent testing of products sold as cardarine has found inconsistent purity and labeling.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
Activation of PPARδ changes transcription of genes involved in fatty acid transport, mitochondrial function, and skeletal muscle fuel preference. In rodent studies, pharmacological PPARδ activation was associated with increased endurance and altered body composition. These findings generated interest in performance enhancement, but species differences and study designs limit direct extrapolation to humans. Small human trials were conducted in the 2000s and later discontinued. The extent to which cardarine produces similar metabolic or performance effects in people remains an open question.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
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.
4 March COVID-19 in the UK: Lockdown Files: The latest leaked WhatsApp messages published by the Daily Telegraph indicate, according to BBC News who have not seen or verified the messages, that Matt Hancock and his staff deliberated over whether or not he had broken COVID-19 regulations after pictures of him kissing his aide, Gina Coladangelo, were published by The Sun newspaper. Other messages also show Hancock criticising the Eat Out to Help Out scheme for "causing problems" in areas where there were a high number of COVID-19 cases. Typhoon jets are scrambled from RAF Coningsby in Lincolnshire to help escort a civilian plane en route from Iceland to Kenya following a loss of communication caused by an equipment malfunction. A sonic boom is heard over parts of England after the jets are allowed to fly at supersonic speed. 5 March Train fares in England and Wales are increased by up to 5.9%, representing the largest increase in more than a decade. COVID-19 in the UK: Lockdown Files: News outlets including BBC News, Sky News and The Independent — who have not verified the messages — report that further WhatsApp messages published by The Telegraph appear to show discussions about how and when the government should reveal details of the Kent variant in order to ensure people would comply with COVID-19 regulations. The news outlets also say Hancock appears to suggest they should "frighten the pants off everyone", while in another conversation, head of the civil service Simon Case suggests the "fear/guilt factor" is an important element of the government's messaging.
Downstream processing refers to the recovery and the purification of biosynthetic products, particularly pharmaceuticals, from natural sources such as animal tissue, plant tissue or fermentation broth, including the recycling of salvageable components as well as the proper treatment and disposal of waste. It is an essential step in the manufacture of pharmaceuticals such as antibiotics, hormones (e.g. insulin and human growth hormone), antibodies (e.g. infliximab and abciximab) and vaccines; antibodies and enzymes used in diagnostics; industrial enzymes; and natural fragrance and flavor compounds. Downstream processing is usually considered a specialized field in biochemical engineering, which is itself a specialization within chemical engineering. Many of the key technologies were developed by chemists and biologists for laboratory-scale separation of biological and synthetic products, whilst the role of biochemical and chemical engineers is to develop the technologies towards larger production capacities. Downstream processing and analytical bioseparation both refer to the separation or purification of biological products, but at different scales of operation and for different purposes. Downstream processing implies manufacture of a purified product fit for a specific use, generally in marketable quantities, while analytical bioseparation refers to purification for the sole purpose of measuring a component or components of a mixture, and may deal with sample sizes as small as a single cell.
Iodine absorbed by the body is almost completely stored in the thyroid gland and has a biological half-life of about 120 days. If the iodine is radioactive (131I), it can irradiate and damage the thyroid gland in high doses during this time. Because the thyroid gland can only absorb a limited amount of iodine, prophylactic administration of non-radioactive iodine may result in iodine blockade. Potassium iodide in tablet form (colloquially known as "iodine tablets") reduces the uptake of radioactive iodine into the thyroid by a factor of 90 or more, thus acting as a radioprotector. All other radiation damage remains unaffected by taking iodine tablets. In Germany, the Potassium Iodide Ordinance (KIV) was enacted in 2003 to ensure "the supply of the population with potassium iodide-containing medicines in the event of radiological incidents". § 1 kiv (in German) Potassium iodide is usually stored in communities near nuclear facilities for distribution to the population in the event of a disaster. People over the age of 45 should not take iodine tablets because the risk of side effects is higher than the risk of developing thyroid cancer. In Switzerland, as a precautionary measure, tablets have been distributed every five years since 2004 to the population living within 20 km of nuclear power plants (from 2014, 50 km). In Austria, large stocks of iodine tablets have been kept in pharmacies, kindergartens, schools, the army and the federal reserve since 2002.
Sources: en.wikipedia.org
==== Defense and national security ==== While spending on defense and security becomes very important to examine when dealing with a country immersed in an armed conflict, the analysis on this issue is relatively recent. This can be explained because until the beginning of the second half of the nineties, defense and security spending had significant growth. Spending on defense and security includes, on one hand, the means by which the State must have to defend sovereignty and territorial integrity, and on the other, the costs involved in maintaining internal security. Various studies of National Planning suggest that the Colombian State spends a much greater percentage in defense and security than other Latin American countries. Between 1991 and 1996, the estimated value of these resources was $3.7 billion. That amounts to 2.6% of Colombia's GDP, while the average of this expentiure in Latin American countries was 1.7% of GDP. A study carried out by the Stockholm International Peace Research Institute (SIPRI) for the year 2001 shows that, "Colombia ranked 24th in the countries with the largest participation in military spending, out of a total of 116 investigated. The figure for the participation of military expenditures in GDP was 3.8% for Colombia, while in the countries of the American continent the closest figure is that of the United States with 3.1%, followed by Chile with 2.9%, Ecuador with 2.1%, and the rest of countries below 2.0% ". Thus, for the period 1999–2003, defense and security spending was $8,463,611.0 million, equivalent to 10.5% of GDP in 2003.
The Center for Surveillance, Epidemiology and Laboratory Services (CSELS) was a branch of the US Centers for Disease Control and Prevention (CDC) from 2013-2022 that provided scientific service, expertise, skills, and tools in support of national efforts to promote health; prevent disease, injury and disability; and prepare for emerging health threats. It was founded in 2013 and had over 700 employees and contractors before its divisions and office of the director were reorganized. CSELS managed over 30 programs across four divisions: Division of Health Informatics and Surveillance, Division of Laboratory Systems, Division of Public Health Information Dissemination, and the Division of Scientific Education and Professional Development.
== Detectors == A time-of-flight mass spectrometer (TOFMS) consists of a mass analyzer and a detector. An ion source (either pulsed or continuous) is used for lab-related TOF experiments, but not needed for TOF analyzers used in space, where the sun or planetary ionospheres provide the ions. The TOF mass analyzer can be a linear flight tube or a reflectron. The ion detector typically consists of microchannel plate detector or a fast secondary emission multiplier (SEM) where first converter plate (dynode) is flat. The electrical signal from the detector is recorded by means of a time to digital converter (TDC) or a fast analog-to-digital converter (ADC). TDC is mostly used in combination with orthogonal-acceleration (oa)TOF instruments. Time-to-digital converters register the arrival of a single ion at discrete time "bins"; a combination of threshold triggering and constant fraction discriminator (CFD) discriminates between electronic noise and ion arrival events. CFD converts nanosecond-long Gaussian-shaped electrical pulses of different amplitudes generated on the MCP's anode into common-shape pulses (e.g., pulses compatible with TTL/ESL logic circuitry) sent to TDC. Using CFD provides a time point correspondent to a position of peak maximum independent of variation in the peak amplitude caused by variation of the MCP or SEM gain.
== History == Flagler Global Logistics can trace its roots back to the original railroad and land development company founded by pioneering American businessman Henry M. Flagler in 1892. Flagler, who helped found Standard Oil, saw Florida's tourism potential and built a network of rail lines, depots, and associated infrastructure that eventually extended all the way from Jacksonville to Key West. As Florida's east coast was still lightly settled, Flagler was able to obtain wide swaths of land up and down the coast, including large tracts of property in what became Miami. After a long bankruptcy that began in 1931, Florida East Coast Railway was purchased by the Alfred I. duPont Testamentary Trust and operated as part of the St. Joe Company. In 1983, St. Joe's incorporated FOXX Holdings, which became the parent company of both Florida East Coast Railway and the railroad's new real estate arm, Flagler Development Company. FOXX was renamed Florida East Coast Industries in April 2000. In 2007, Florida East Coast Industries was purchased by Fortress Investment for $3.5 billion, and shortly afterwards, Florida East Coast Railway was spun off into a separate and distinct company from Florida East Coast Industries. To better take advantage of its strategic land holdings, and provide scalable third-party logistics, Florida East Coast Industries established South Florida Logistics Services as an LLC in Delaware in April 2013. The company officially incorporated in the state of Florida in May 2013.
Sources: en.wikipedia.org
No. Cardarine is GW501516, a PPARδ agonist, while SARMs act on androgen receptors. The two classes are often grouped in informal discussions despite different mechanisms.
No. It has no approved medical indication in any country. Regulatory agencies have not cleared it for treatment or prevention of any condition.
Early clinical work stopped after rodent carcinogenicity findings. Those animal results raised concerns about long-term human risk, although direct human evidence is lacking. The human relevance of the tumors remains an open scientific question.
Yes, WADA prohibits cardarine as a PPARδ agonist. It appears on the prohibited list and can be detected in urine or blood. Athletes using it risk sanctions.