The short version of PPARδ agonist fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-09-22 and is reviewed periodically as new material appears.
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
Cardarine is a common name for GW501516, a synthetic compound first described in the 1990s as a selective agonist of the peroxisome proliferator-activated receptor delta. It was studied in preclinical models for metabolic and cardiovascular conditions, but it has not been approved as a medicine in the United States, Europe, or other major jurisdictions. Retail products labeled as cardarine are generally research chemicals or supplements, not pharmaceutical formulations. Because human safety and efficacy data remain limited, regulatory agencies treat it as an unapproved substance rather than a therapeutic product.
Sporting authorities added GW501516 to prohibited lists after it appeared in athlete samples and online markets. The World Anti-Doping Agency classifies it as a hormone and metabolic modulator, and its use can lead to an anti-doping rule violation. Some early laboratory work suggested effects on fatty acid oxidation and endurance-related metabolism in animals, but those findings do not establish safe or effective use in people. Reports of adverse events in humans are scarce and often anecdotal, which complicates risk assessment.
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.
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.
| Property | Value | Notes |
|---|---|---|
| IUPAC name | {4-[({4-methyl-2-[4-(trifluoromethyl)phenyl]-1,3-thiazol-5-yl}methyl)sulfanyl]phenoxy}acetic acid | Systematic name for GW501516 |
| CAS Registry Number | 317318-70-0 | Unique identifier for the parent compound |
| Molecular formula | C21H18F3NO3S2 | Includes carbon, hydrogen, fluorine, nitrogen, oxygen, and sulfur |
| Molecular weight | 453.5 g/mol | Approximate value for the neutral form |
| Appearance | White to off-white powder | Typical description for purified laboratory material |
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.
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.
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.
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.
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 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.
They formed the backbone of the southern political class. Illiteracy peaked in the Mezzogiorno at 90%. Even the extension of the Casati Law to the entire Kingdom, which introduced compulsory schooling for two years did not produce the hoped-for effects: the municipalities had to provide for the construction and maintenance of school buildings, as well as the recruitment and payment of elementary teachers, which was impossible for many southern municipalities, which did not build schools because they often had negative budgets orlacked the political will to start an effective school education system, as local leaders feared its potential and social claims. The same was true for the next school reform, the Coppino Law of 1877, which raised compulsory schooling to 9 years of age and granted low-interest loans to municipalities that built school buildings: southern municipalities, however, often did not get the work started, as they feared that the new school measure would make the peasant masses more aware of their rights, and thus local notables would lose their electoral clientele.
(2026) describe a late Pliocene proboscidean and even-toed ungulate assemblage (the Dongyancun Fauna) from the Sanmenxia Basin (Zhongtiao Mountains; China), including the first reported Pliocene record of Leptobos in northern China, and providing evidence of composition of large herbivore assemblages in northern China shortly before Quaternary climate changes, arrival of true horses and appearance of Mammuthus meridionalis. Shidqi et al. (2026) review the fossil record of Pleistocene mammals from Sumatra (Indonesia), reporting evidence of presence of mammals with Indochinese and Sundaic affinities and evidence of limited taxonomic losses since the late Middle Pleistocene. Zhang et al. (2026) report the discovery of new fossil material of Early Pleistocene mammals from the Yeka locality in the Shangri-La region (Yunnan, China), and interpret the composition of the studied assemblage as indicative of an environment including a forest mixed with a grassland landscape. Linchamps et al. (2026) study the composition of the Early Pleistocene small mammal assemblage from the Gondolin GD2 locality (South Africa), interpreted as indicative of environments dominated by grassland and open savannas.
Structures that are intraperitoneal are generally mobile, while those that are retroperitoneal are relatively fixed in their location. Some structures, such as the kidneys, are "primarily retroperitoneal", while others such as the majority of the duodenum, are "secondarily retroperitoneal", meaning that structure developed intraperitoneally but lost its mesentery and thus became retroperitoneal.
== Effects == The effects of strength training include greater muscular strength, improved muscle tone and appearance, increased endurance, cardiovascular health, and enhanced bone density. These benefits contribute not only to athletic performance but also to long-term health and independence, especially as individuals age. Regular resistance training supports metabolic function, helps regulate body weight, and can improve mental well-being through the release of endorphins.
=== Pharmacokinetics === Butane-1,4-diol is rapidly converted into GHB acid by the enzymes alcohol dehydrogenase and aldehyde dehydrogenase, and differing levels of these enzymes may account for differences in effects and side effects between users. While co-administration of ethanol and GHB already poses serious risks, co-administration of ethanol with 1,4-butanediol will interact considerably and has many other potential risks. This is because the same enzymes that are responsible for metabolizing alcohol also metabolize 1,4-butanediol so there is a strong chance of a dangerous drug interaction. Emergency room patients who overdose on both ethanol and 1,4-butanediol often present with symptoms of alcohol intoxication initially and as the ethanol is metabolized the 1,4-butanediol is then able to better compete for the enzyme and a second period of intoxication ensues as the 1,4-butanediol is converted into GHB.
Sources: en.wikipedia.org
Idiopathic pulmonary fibrosis (IPF): the most common subgroup, representing more than 30% of ILD Desquamative interstitial pneumonia (DIP) Acute interstitial pneumonia (AIP): also known as Hamman-Rich syndrome Nonspecific interstitial pneumonia (NSIP) Respiratory bronchiolitis-associated interstitial lung disease (RB-ILD) Cryptogenic organizing pneumonia (COP): also known by the older name bronchiolitis obliterans organizing pneumonia (BOOP) Lymphoid interstitial pneumonia (LIP)
Zolpidem is labeled for short-term (usually about two to six weeks) treatment of insomnia at the lowest possible dose. It may be used for both improving sleep onset, sleep onset latency, and staying asleep. Guidelines from NICE, the European Sleep Research Society, and the American College of Physicians recommend medication for insomnia (including possible zolpidem) only as a second-line treatment after non-pharmacological treatment options have been tried (e.g. cognitive behavioral therapy for insomnia). This is based in part on a 2012 review which found that Zolpidem's effectiveness is nearly as much due to psychological effects as to the medication itself.
== September == 2 September With the outcome of the war still in question, Chairman of the Workers' Party of Vietnam Hồ Chí Minh died on the morning of 2 September 1969, at his home in Hanoi at age 79 from heart failure.
Physician self-referral is the practice of a physician referring a patient to a medical facility in which the physician has a financial interest, be it ownership, investment, or a structured compensation arrangement. Critics argue that this practice is an inherent conflict of interest, because the physician benefits from the physician's own referral. They suggest that such arrangements may encourage overutilization of services, in turn driving up health care costs. In addition, they believe that it would create a captive referral system, which limits competition by other providers. Those who defend the practice contend that these problems are not widespread. They argue that physicians who own, invest in, or operate medical facilities are responding to a need for medical services which would otherwise not be met, particularly in medically under-served areas. In addition, it is often the case that physician owned entities present a lower-cost alternative to the facilities that are located at hospitals. This is due mostly to higher overhead costs that hospitals must pass down to their services.
Sources: en.wikipedia.org
The compound is now under active investigation by researchers at NIMH for potential clinical use, and it is hoped that use of HNK instead will mitigate the various concerns (such as abuse and dissociation) of using ketamine itself in the treatment of depression.
=== Yeast Metabolome Database === The Yeast Metabolome Database is a freely accessible, online database of >2,000 small molecule metabolites found in or produced by Saccharomyces cerevisiae (Baker's yeast). The YMDB contains two kinds of information:
Williams cites the Mahatanhasankhaya Sutta as showing how dependent origination is to be seen as an alternative theory to such views. According to Williams, dependent origination allows the Buddha to replace a view of the world based on unchanging selves "with an appeal to what he sees as being its essentially dynamic nature, a dynamism of experiences based on the centrality of causal conditioning." Bhikkhu Analayo writes that "dependent arising is the other side of the coin of emptiness, in the sense of the absence of a substantial and unchanging entity anywhere in subjective experience. Experience or existence is nothing but conditions. This leaves no room for positing a self of any type." According to Eisel Mazard, the twelve Nidanas are a description of "a sequence of stages prior to birth", as an "orthodox defense against any doctrine of a 'supernal self' or soul of any kind [...] excluding an un-mentioned life-force (jīva) that followers could presume to be additional to the birth of the body, the arising of consciousness, and the other aspects mentioned in the 12-links formula." According to Mazard, "many later sources have digressed from the basic theme and subject-matter of the original text, knowingly or unknowingly."
=== Reagents and Diagnostics === Affimer binders have been used across a number of platforms, including ELISA, surface plasmon resonance, affinity purification. Affimers that inhibit protein-protein interactions can be produced with the potential to express these inhibitors in mammalian cells modify signalling pathways as cell therapies.
== Chemical synthesis == The first total synthesis of gliotoxin was achieved by Fukuyama and Kishi in 1976. Gliotoxin contains a total of four asymmetric centers along with two ring systems—hydrated benzene and epidithiapiperazinedione. Fukuyama and Kishi first synthesized the thioacetal 1 from glycine sarcosine anhydride via a six-step synthesis with an overall 30% yield. A Michael reaction of 4-carbo-tert-butoxybenzene oxide 2 in excess in a solvent of dimethyl sulfoxide (DMSO) containing Triton B at room temperature produced the alcohol 3 in 88% overall yield. It is expected that there would be a trans-opening of the epoxide ring for 2, so the resulting epimers would differ in the relative configuration of the thioacetal bridge and the alcoholic group depending on the orientation of compounds 1 and 2 in the transition state. It was theorized that the orientation of 1 and 2 that produced the alcohol 3 would be unfavorable in non-polar solvents. Thus, desired stereochemistry was assigned to the alcohol 3, and this compound was used in the further synthesis.
Sources: en.wikipedia.org
No. Major drug regulators have not approved GW501516 for treating any medical condition. Products sold as cardarine are typically unapproved research chemicals or supplements, so their contents and safety are not assured.
It is prohibited by the World Anti-Doping Agency as a hormone and metabolic modulator. Athletes who test positive for GW501516 can face sanctions, including suspensions and loss of results.
Cardarine is a common or trade-style name, while GW501516 is the research code for the same chemical entity. Some sources also use Endurobol or GSK-516. The names refer to the same compound, not distinct drugs.
Legal status varies by country, but cardarine is not approved as a medicine in major jurisdictions. It is often sold as a research chemical, a category that may not be lawful for human use. Buyers should check local laws and product labels carefully.