PPARδ agonist 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 2025-08-17. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
| 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 |
Because cardarine is not an approved medicine, no pharmacopeial monograph defines its identity, purity, or storage requirements. Laboratories typically rely on in-house methods and reference standards when testing materials labeled as GW501516. Certificates of analysis may report purity and identity for a specific batch, but their scope varies and they do not guarantee safety or legal status. Independent verification can include high-performance liquid chromatography, mass spectrometry, nuclear magnetic resonance, and elemental analysis. The distinction between research chemical labeling and human use is significant because quality standards and oversight differ.
Cardarine can be detected in biological samples and product materials using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The method separates compounds by chromatography and identifies them by mass-to-charge transitions, allowing low-level detection in urine or blood. Sample preparation often involves enzymatic hydrolysis, solid-phase extraction, or protein precipitation. Certified reference materials and isotope-labeled internal standards improve quantification. Detection windows depend on metabolism, matrix, and assay sensitivity, so no single universal window applies.
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.
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.
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.
Laboratory studies indicate that GW501516 activates PPARδ, a nuclear receptor involved in fatty acid oxidation and energy metabolism. In rodent experiments, treated animals often showed increased endurance and reduced fat mass. These effects were observed under controlled conditions and do not establish safe or effective use in humans. The exact dose-response relationship in humans remains poorly characterized. Species differences in metabolism can affect how results translate across animals and people.
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.
The territory of Hanover had earlier been a principality within the Holy Roman Empire before being elevated into an electorate in 1708, when Hanover was formed by the union of the dynastic divisions of the Duchy of Brunswick-Lüneburg, excepting the Principality of Brunswick-Wolfenbüttel. After his accession in 1714, George Louis of the House of Hanover ascended the throne of Great Britain as George I, and Hanover was joined in a personal union with Great Britain. In 1803, Hanover was conquered by the French and Prussian armies in the Napoleonic Wars. The Treaties of Tilsit in 1807 joined it to territories from Prussia and created the Kingdom of Westphalia, ruled by Napoleon's youngest brother, Jérôme Bonaparte. French control lasted until October 1813, when the territory was overrun by Russian Cossacks. The Battle of Leipzig, shortly thereafter, spelled the definitive end of the Napoleonic client states, and the electorate was restored to the House of Hanover. The terms of the Congress of Vienna in 1814 not only restored Hanover but also elevated it to an independent kingdom with its Prince-Elector, George III of the United Kingdom, as King of Hanover. The new kingdom was also greatly expanded and became the fourth-largest state in the German Confederation (behind Prussia, Austria and Bavaria) and the second-largest in northern Germany. George III never visited the kingdom during his 60-year reign.
=== Tigecycline === Tigecycline, a member of the glycylcyclines antibiotics, has proven to be an effective therapy against Enterobacteriaceae that typically display tetracycline resistance, because tigecycline has a higher binding affinity with ribosomal sites than tetracycline has. Tigecycline is capable of killing almost all of the ESBLs and multidrug-resistant (MDR) E. coli isolates and the large majority of ESBL and MDR isolates of Klebsiella species. A 2008 review of 42 studies of in vitro susceptibility of bacteria to tigecycline showed that MDR K. pneumoniae and E. coli, including those that were carbapenem resistant, were susceptible more than 90% of the time. A limited number of patients have been treated with tigecycline, but the FDA has approved it in certain cases with synergies of other drugs. The limited number of patients indicates that more trials are needed to determine the overall clinical effectiveness. Although tigecycline is one of the first lines of defense against carbapenemase-producing isolates, negative clinical outcomes with tigecycline have occurred. Both urinary tract and primary blood infections can make tigecycline ineffective, because it has limited penetration and rapid tissue diffusion after being intravenously infused, respectively.
There were proposals to extend this corridor 7 miles to Chapel Hill with light rail technology. However, in 2006 Triangle Transit deferred implementation indefinitely when the Federal Transit Administration declined to fund the program due to low ridership projections. The region's two metropolitan planning organizations appointed a group of local citizens in 2007 to reexamine options for future transit development in light of Triangle Transit's problems. The Special Transit Advisory Commission (STAC) retained many of the provisions of Triangle Transit's original plan but recommended adding new bus services and raising additional revenues by adding a new local half-cent sales tax to fund the project. Greyhound Lines provides an inter-city bus service to Durham, Charlotte, Richmond, Washington, D.C., Atlanta, and other cities.
Even edible mushrooms may produce allergic reactions in susceptible individuals, from a mild asthmatic response to severe anaphylactic shock. Even the cultivated A. bisporus contains small amounts of hydrazines, the most abundant of which is agaritine (a mycotoxin and carcinogen). However, the hydrazines are destroyed by moderate heat when cooking. A number of species of mushrooms are poisonous; although some resemble certain edible species, consuming them could be fatal. Eating mushrooms gathered in the wild is risky and should only be undertaken by individuals knowledgeable in mushroom identification. Common best practice is for wild mushroom pickers to focus on collecting a small number of visually distinctive, edible mushroom species that cannot be easily confused with poisonous varieties. Common mushroom hunting advice is that if a mushroom cannot be positively identified, it should be considered poisonous and not eaten. In Jainism, the consumption of mushrooms and other edible fungi is strictly prohibited. This dietary restriction is fundamentally rooted in the religion's core ethical principle of nonviolence (ahimsa). Classical Jain taxonomy classifies mushrooms as ananthkay, meaning they are considered to be bodies that harbor an infinite number of microscopic souls or lifeforms (nigoda). Furthermore, because mushrooms frequently grow in dark environments or on decaying organic matter, traditional Jain biology views them as continuous breeding grounds for mobile microorganisms (trasa jiva).
After the discovery of the gene encoding myostatin in 1997, several laboratories cloned and established the nucleotide sequence of a myostatin gene in two breeds of cattle, Belgian Blue and Piedmontese. They found mutations in the myostatin gene (various mutations in each breed) which in one way or another lead to absence of functional myostatin. Unlike mice with a damaged myostatin gene, in these cattle breeds, muscle cells multiply rather than enlarge. People describe these cattle breeds as "double-muscled", but the total increase in all muscles is no more than 40%. Animals lacking myostatin or animals treated with substances such as follistatin that block the binding of myostatin to its receptor have significantly larger muscles. Thus, reduction of myostatin could potentially benefit the livestock industry, with even a 20 percent reduction in myostatin levels potentially having a large effect on the development of muscles. However, the animal breeds developed as homozygous for myostatin deficiency have reproduction issues due to their unusually heavy and bulky offspring, and require special care and a more expensive diet to achieve a superior yield. This negatively affects economics of myostatin-deficient breeds to the point where they do not usually offer an obvious advantage. While hypertrophic meat (e.g.
Sources: en.wikipedia.org
== History == Gordon C. Sharp first described mixed connective tissue disease (MCTD) in 1972 as an entity with mixed features of systemic sclerosis (SSc), systemic lupus erythematosus (SLE), polymyositis/dermatomyositis (PM/DM), and rheumatoid arthritis (RA) along with an elevated level of high-titre anti-U1small nuclear (sn) anti-ribonucleoprotein (anti-RNP) antibodies.
=== Double bond position === Each cannabinoid may exist in different forms depending on the double bond position in the alicyclic carbon ring. Under the dibenzopyran numbering system, the major form of THC is Δ9-THC, and the minor form is Δ8-THC. In the alternate terpene numbering system, these are Δ1-THC and Δ6-THC, respectively.
The four major broadcasters in the U.S. are the National Broadcasting Company (NBC), Columbia Broadcasting System (CBS), American Broadcasting Company (ABC), and Fox Broadcasting Company (Fox). The four major broadcast television networks are all commercial entities. The Public Broadcasting Service (PBS) is the country's major non-commercial public broadcast network; it also provides educational programming through local PBS stations. The U.S. cable television system offers hundreds of channels catering to a variety of niches. In 2021, about 83% of Americans over age 12 listened to broadcast radio, while about 40% listened to podcasts. In the prior year, there were 15,460 licensed full-power radio stations in the U.S. according to the Federal Communications Commission (FCC). Public radio broadcasting is largely supplied by National Public Radio (NPR), incorporated in February 1970 under the Public Broadcasting Act of 1967. U.S. newspapers with a global reach and reputation include The Wall Street Journal, The New York Times, The Washington Post, and USA Today. About 800 publications are produced in Spanish. With few exceptions, newspapers are privately owned, either by large chains such as Gannett or McClatchy, which own dozens or even hundreds of newspapers; by small chains that own a handful of papers; or, in an increasingly rare situation, by individuals or families. Major cities often have alternative newspapers to complement the mainstream daily papers, such as The Village Voice in New York City and LA Weekly in Los Angeles.
== Abstracting and indexing == The journal is abstracted and indexed in Chemical Abstracts, Current Contents/Clinical Medicine, Index Medicus/MEDLINE/PubMed, Science Citation Index Expanded, and Scopus. According to the Journal Citation Reports, the journal has a 2015 impact factor of 1.224.
N-Linked glycans derive their name from the fact that the glycan is attached to an asparagine (Asn, N) residue, and are amongst the most common linkages found in nature. Although the majority of N-linked glycans take the form GlcNAc-β-Asn other less common structural linkages such as GlcNac-α-Asn and Glc-Asn have been observed. In addition to their function in protein folding and cellular attachment, the N-liked glycans of a protein can modulate the protein's function, in some cases acting as an on-off switch.
Sources: en.wikipedia.org
=== Pharmacokinetics === Amitriptyline is readily absorbed from the gastrointestinal tract (90–95%). Absorption is gradual with the peak concentration in blood plasma reached after about 4 hours. Extensive metabolism on the first pass through the liver leads to average bioavailability of about 50% (45%-53%). Amitriptyline is metabolized mostly by CYP2C19 into nortriptyline and by CYP2D6 leading to a variety of hydroxylated metabolites, with the principal one among them being (E)-10-hydroxynortriptyline (see metabolism scheme), and to a lesser degree, by CYP3A4. Nortriptyline, the main active metabolite of amitriptyline, is an antidepressant on its own right. Nortriptyline reaches 10% higher level in the blood plasma than the parent drug amitriptyline and 40% greater area under the curve, and its action is an important part of the overall action of amitriptyline. Another active metabolite is (E)-10-hydroxynortriptyline, which is a norepinephrine uptake inhibitor four times weaker than nortriptyline. (E)-10-hydroxynortiptyline blood level is comparable to that of nortriptyline, but its cerebrospinal fluid level, which is a close proxy of the brain concentration of a drug, is twice higher than nortriptyline's. Based on this, (E)-10-hydroxynortriptyline was suggested to significantly contribute to the antidepressant effects of amitriptyline. Blood levels of amitriptyline and nortriptyline and pharmacokinetics of amitriptyline in general, with clearance difference of up to 10-fold, vary widely between individuals.
In this study, the UK school children had a low baseline cellular immunity to mycobacteria which was increased by BCG; in contrast, the Malawi school children had a high baseline cellular immunity to mycobacteria and this was not significantly increased by BCG. Whether this natural immune response is protective is not known. An alternative explanation is suggested by mouse studies; immunity against mycobacteria stops BCG from replicating and so stops it from producing an immune response. This is called the block hypothesis. Interference by concurrent parasitic infection In another hypothesis, simultaneous infection with parasites such as helminthiasis changes the immune response to BCG, making it less effective. As Th1 response is required for an effective immune response to tuberculous infection, but concurrent infection with various parasites produces a simultaneous Th2 response, which blunts the effect of BCG.
=== Military use === Fenethylline is a major stimulant, sometimes dubbed the "jihad drug", used by some jihadist fighters. It quickly produces a euphoric intensity in users, allowing them to stay awake for a very long time, remaining more calm and focused under the effects of the drug, which allows the senses to stay at more operational levels. It also helps to subdue feelings of fear and hunger during lengthy operations. Psychiatrist Robert Keisling said that the drug "gives you a sense of well-being and euphoria", along with the thought that "you're invincible and that nothing can harm you." Those who go on jihad missions take high doses to prepare, says a former fighter associated with the Muslim Brotherhood. He described the effect: "They go blank. Their heart rate spikes. They lose all connection to their emotions and thoughts." Some commented on this effect as a "zombie-like detachment". An illegal Syrian manufacturer told New York Magazine in 2015 of the effect the drug had on fighters: "[If] someone takes many pills, like 30 or so, they become violent and crazy, paranoid, unafraid of anything. They'll have a thirst for fighting and killing and will shoot at whatever they see. They lose any feeling or empathy for the people in front of them and can kill them without caring at all." According to some commentators, fighters taking the drug in Syria were better able to tolerate the pain of being shot. A drug control officer in the central city of Homs told Reuters that protestors and fighters were able to resist painful interrogations better while on fenethylline.
=== In production === Pneumatic tube systems are used in production plants. Uses include conveying spare parts, measuring instruments, tools, or work pieces alongside conveyor belts or in the production process. In industrial laboratories samples are transported through the pneumatic tube systems. These can be conveyed in any physical state (solid, liquid, gas) and at any temperature. For example, the industrial company ThyssenKrupp sends 900 °C (1,650 °F) steel samples through pneumatic tubes at a rate of 22 m (72 ft) per second from the furnace to the laboratory.
=== Pharmacodynamics === MCCAM acts as a selective pseudo-irreversible partial agonist of the μ-opioid receptor (MOR). It shows both opioid agonist- and antagonist-like effects in animals. More specifically, it has analgesic effects, mixed reinforcing effects, appears to lack significant respiratory depression, alleviates opioid withdrawal symptoms, and provides long-lasting blockade and protection against the effects of MOR full agonists (including their reinforcing effects as well as their toxic and lethal effects, for instance in overdose). Due to its pseudo-irreversible nature, MCCAM is insurmountable by conventional reversible MOR ligands, for instance morphine, alfentanil, and naltrexone. MCCAM is buprenorphine-like in many regards, but differs from buprenorphine in its pseudo-irreversibility.
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.
No. Cardarine has not received approval for human therapeutic use in major jurisdictions. It remains an investigational compound.