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.
Updated 2025-10-30. Numbers and descriptions here follow the published literature rather than marketing material.
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 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.
Detection of GW501516 in biological samples generally relies on liquid chromatography coupled with tandem mass spectrometry. Urine is a common matrix in anti-doping analysis, while blood or plasma may be used in research settings. Sample preparation can involve enzymatic hydrolysis, protein precipitation, or solid-phase extraction before instrumental analysis. Because the compound undergoes metabolism, assays may target the parent molecule, one or more metabolites, or both. Detection windows are not fixed; they depend on factors such as dose, route, individual metabolism, and assay sensitivity. Reference standards are required for accurate identification and quantification.
Handling and quality assessment of cardarine reference material follow general laboratory practices for poorly characterized compounds. It typically appears as a white to off-white powder and is sparingly soluble in water but soluble in organic solvents such as dimethyl sulfoxide and ethanol. Storage recommendations usually specify a cool, dry, dark place, with long-term storage at low temperature and desiccation. Purity may be checked by high-performance liquid chromatography with ultraviolet detection, while identity is confirmed by mass spectrometry and nuclear magnetic resonance. No pharmacopeial monograph exists, so reported purity and stability depend on the supplier’s methods.
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
| 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 |
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.
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 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.
A persistent misconception is that cardarine is a fat-burning drug or a safe alternative to anabolic steroids. No approved therapeutic product exists, and human safety data are limited. The tumor findings in rodents remain a central concern in scientific reviews. Products sold online may contain inaccurate labels, impurities, or different compounds entirely, which complicates any assessment of effects. Independent testing of such products has reported frequent mislabeling. For these reasons, discussions in the literature emphasize risks and unknowns rather than benefits.
Cardarine is not approved for human therapeutic use in any major jurisdiction. It appears on the World Anti-Doping Agency Prohibited List as a PPARδ agonist within the hormone and metabolic modulators category. Sports organizations test for it because it has been detected in athlete samples and seized products. Regulatory actions against marketed research chemical versions have occurred in several countries, though enforcement varies. Availability through unregulated channels complicates oversight.
Analytical laboratories typically identify cardarine and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is a common matrix in anti-doping testing, while blood and tissue may be used in research settings. Detection windows depend on the assay, the sample matrix, and the compound's metabolism. Because cardarine is extensively metabolized, laboratories often target specific metabolites to improve sensitivity and confirmation. Reference standards are required for reliable quantification. Method validation includes checks for selectivity, linearity, and carryover.
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.
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.
Mental health problems in children and adolescents contributed to a global prevalence of 13% in 2015. In 2019, about one in seven of the world's 10–19 year olds experienced a mental health disorder, a total of about 165 million young people. Adolescence is a critical and unique phase of development in psychological growth. Children having mental health problems can have adverse outcomes, such as poor school performance, social difficulties, substance abuse, and poor physical health. The adverse effects even extend beyond the children themselves - increased reliance on public sector services and healthcare services, loss productivity among parents or care-givers, and burden to society. More than half of mental health conditions start before a child reaches 20 years of age, with onset occurring in adolescence much more frequently than it does in early childhood or adulthood. However, pre-school children with early mental health problems are increasing in prevalence in the 21st century. Many such cases go undetected and untreated. In the United States, in 2021, at least roughly 17.5% of the population (ages 18 and older) were recorded as having a mental illness. The comparison between reports and statistics of mental health issues in newer generations (18–25 years old to 26–49 years old) and the older generation (50 years or older) signifies an increase in mental health issues as only 15% of the older generation reported a mental health issue whereas the newer generations reported 33.7% (18–25) and 28.1% (26–49).
In the 1950s and 1960s, most heroin was produced in Turkey and transshipped in France via the French Connection crime ring, with much of it arriving in the United States. This resulted in the record setting 26 April 1968 seizure of 246 lb (111.6 kg) of heroin smuggled in a vehicle on the SS France (1960) ocean liner. By the time of The French Connection (1971 film), this route was being supplanted. Then, until c. 2004, the majority of the world's heroin was produced in an area known as the Golden Triangle. However, by 2007, 93% of the opiates on the world market originated in Afghanistan. This amounted to an export value of about US$4 billion, with a quarter being earned by opium farmers and the rest going to district officials, insurgents, warlords and drug traffickers. Another significant area where poppy fields are grown for the manufacture of heroin is Mexico. In November 2023, a U.N report showed that in the entirety of Afghanistan, poppy cultivation dropped by over 95%, removing it from its place as being the world's largest opium producer. According to the United States Drug Enforcement Administration, the price of heroin is typically valued 8 to 10 times that of cocaine on American streets, making it a high-profit substance for smugglers and dealers. In Europe (except the transit countries Portugal and the Netherlands), for example, a purported gram of street heroin, usually consisting of 700–800 mg of a light to dark brown powder containing 5–10% heroin base, costs €30–70, making the effective value per gram of pure heroin €300–700.
==== Deuteron mass and radius ==== The deuterium nucleus is called a deuteron. It has a mass of 2.013553212544(15) Da (1875.61294500(58) MeV/c2). The charge radius of a deuteron is 2.12778(27)×10−15 m. Like the proton radius, measurements using muonic deuterium produce a smaller result: 2.12562(78) fm.
=== Available forms === Selenium disulfide is available in the form of a prescription drug as a 2.25% medical shampoo. In the United States, a 1% strength is available over-the-counter, and a 2.5% strength is also available with a prescription. In Canada, the 2.5% strength is available over-the-counter. Selsun Blue is an over-the-counter shampoo for dandruff with 1% selenium disulfide as its active ingredient.
Sources: en.wikipedia.org
Recipes intended for other cooking methods must be modified for slow cookers. Quantities of liquids may need adjustment, as there is a little evaporation, but there should be enough liquid to cover the food. Many published recipes for slow cookers are designed primarily for convenience and use few ingredients, and often use prepared sauces or seasonings. The long, moist cooking is particularly suitable for tough and cheap cuts of meat including pork shoulder, chuck steak and brisket. For many slow-cooked dishes, these cuts give better results than more expensive ones. They are also often used to cook while unattended, meaning the cook can fill the pot with its ingredients and come back several hours later to a ready meal.
=== Oxygen deficiency monitors === Oxygen sensors are used to measure oxygen levels in confined spaces and any place where nitrogen gas or liquid are stored or used. In the event of a nitrogen leak, and a decrease in oxygen to a pre-set alarm level, an oxygen deficiency monitor can be programmed to set off audible and visual alarms. Most commonly, the oxygen range to alert personnel is when oxygen levels drop below 19.5%. In the U.S., OSHA specifies that a hazardous atmosphere may include one where the oxygen concentration is below 19.5% or above 23.5%.
On August 10, 2022, Brian José Infante Machín, President of the Masonic Union for the Freedom of Cuba, published a Facebook post on the account of the Ibero-American-European Alliance against Communism, calling for a national strike on Fidel Castro's birthday, August 13. He told Freemasons that they should march in the streets in solidarity with those young people who had been mistreated by the government during the July 11th Protests. In September 2022, according to the 2022 edition of La Gran Logia (the magazine of the Grand Lodge of Cuba), the Supreme Court of Masonic Justice either expelled or ratified the expulsion of seven Freemasons from the fraternity in Cuba; Pavel Guillén Guzmán from Dos Ríos Lodge in Palma Soriano, Pedro Demesio Martínez González from Astrea Lodge in Centro Habana, Luis Alberto Reyes Expósito from Asilo de la Virtud Lodge in Cienfuegos, Brian José Infante Machín from Luz Caballero Lodge No. 81 in Marianao, Lester Damián Cañizares from Luz Caballero Lodge No. 81, and Manuel Arístides Suárez Álvarez from Victor Hugo Lodge in Matanzas.
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.
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.