The short version of anti-doping fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-07-14 and is reviewed periodically as new material appears.
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.
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.
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.
| 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 |
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.
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.
GW501516 acts as a ligand for PPAR delta, a nuclear receptor that regulates transcription of genes involved in fatty acid oxidation and energy use. Activation of this receptor in skeletal muscle shifts metabolism toward fat burning in animal models. The compound does not burn fat directly; it changes gene expression over hours to days. Researchers study it to understand metabolic flexibility and exercise adaptation. Effects observed in rodents are not automatically expected in humans.
Preclinical research reported that GW501516 increased running endurance in mice and improved lipid profiles in some animal species. Early human trials explored effects on high-density lipoprotein cholesterol, triglycerides, and glucose handling, but the program was discontinued. Published human data are sparse and do not establish efficacy for any condition. Studies also examined PPAR delta in cancer biology, with conflicting findings across models. The relationship between receptor activation, tissue context, and disease risk remains an active area of investigation.
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
Bone marrow transplant (heme-oncology intervention): The replacement of the bone marrow with bone marrow from an individual without spherocytosis. The transplanted progenitor cells do not have the genetic mutations found in individuals with hereditary spherocytosis, and therefore do not produce spherocytes. This results in an individual with biconcave-disc-shaped erythrocytes. This treatment is not standard of care, and is not offered as it has only been documented incidentally during treatment for other diseases, such as myelodysplastic syndrome. Symptomatic treatments:
== History == The original interface between capillary zone electrophoresis and mass spectrometry was developed in 1987 by Richard D. Smith and coworkers at Pacific Northwest National Laboratory, and who also later were involved in development of interfaces with other CE variants, including capillary isotachophoresis and capillary isoelectric focusing.
== Side effects == The most common side effects are flatulence (in 5% of people taking the drug), diarrhea (4%), constipation (4%), stool color change (4%), nausea (3%), vomiting (3%), and abdominal discomfort, bloating and pain (1%). Ferric maltol may cause serious side effects including increased risk of inflammatory bowel disease flare and iron overload in the body.
Sources: en.wikipedia.org
At the first years of war, during Spanish constitutional period, the main military effort of Spain was aimed at preserving the island of Cuba and the viceroyalty of Mexico in North America. But in 1814, with the restoration of Ferdinand VII, the strategic line of the war changed drastically, directing the major Spanish military effort towards South America. By 1815 the general outlines of which areas were controlled by royalists and pro-independence forces were established and a general stalemate set in the war. In areas where royalists controlled the main population centers, most of the fighting by those seeking independence was done by isolated guerrilla bands. In New Spain, the two main guerrilla groups were led by Guadalupe Victoria in Puebla and Vicente Guerrero in Oaxaca. In northern South America, New Granadan and Venezuelan Patriots, under leaders such as Simón Bolívar, Francisco de Paula Santander, Santiago Mariño, Manuel Piar and José Antonio Páez, carried out campaigns in the vast Orinoco River basin and along the Caribbean coast, often with material aid coming from Curaçao and Haiti. Also, as mentioned above, in Upper Peru, guerrilla bands controlled the isolated, rural parts of the country.
In addition, acetylcysteine in aqueous solution can undergo hydrolysis, leading to the breakdown of the amide bond in the molecule. Still, aqueous solutions of acetylcysteine are generally stable when stored properly: the solutions should be kept in tightly sealed containers and stored at controlled room temperature to prolong the stability. Acetylcysteine has been reported to have a pH of 2.2 when administered through inhalation.
== History == April 2016: initiation of Phase 2b trial December 2017: initiation of JADE Mono-1 Phase 3 trial May 2018: Results of Phase 2b trial posted October 2019: Results of Phase 3 trial presented June 2020: Results of second Phase 3 trial published The US Food and Drug Administration (FDA) approved abrocitinib based on evidence from three controlled clinical trials enrolling a total of 1615 participants supporting efficacy and safety. Two of the trials enrolled participants twelve years of age and older with moderate-to-severe atopic dermatitis and one trial enrolled adults with moderate-to-severe atopic dermatitis. The trials were conducted at multiple sites in 18 countries (i.e., United States, Canada, Australia, Mexico, Chile, Great Britain, Poland, Germany, Bulgaria, Hungary, Czech Republic, Latvia, Slovakia, Spain, Italy, Japan, Korea, Taiwan). In addition, safety analyses were performed on the combined results of these 3 controlled clinical trials and one additional controlled study in a total of 1,540 participants. All three trials evaluated two doses of abrocitinib: 100 mg and 200 mg. The monotherapy trials were identically designed, 16-week, randomized, multicenter, double-blind, placebo-controlled, parallel group, phase 3 trials. Trial-AD-3 with concomitant background therapy was a 24-week, multicenter, randomized, double-blind, active-comparator (dupilumab) and placebo-controlled, phase 3 trial.
Sources: en.wikipedia.org
The acetylcholinesterase inhibitor chemical class includes neostigmine and rivastigmine, both of which have a chemical structure based on the natural alkaloid physostigmine. The tranquilizer, sedative-hypnotic, and muscle relaxant, meprobamate (branded Miltown) was commonly prescribed from the 1950s through the 1970s. Soma (carisoprodol) is a CNS depressant and a prodrug of meprobamate; initially acting primarily as a mildy-sedating muscle relaxant and muscle pain reliever; after 2-3 hours, 20-30% of initial dose converts into active metabolite meprobamate, synergistically working together to potentiate, or add on to/increase, the existing sedation and muscle relaxation and analgesia. Valmid or Valamin was a carbamate derivative chemically named ethinamate. It was withdrawn from the market in the U.S. and Netherlands around 1990. The protease inhibitor darunavir for HIV treatment also contains a carbamate functional group. Ephedroxane, an aminorex analogue used as a stimulant, also falls into the carbamate category. Felbamate is an anticonvulsant used in the treatment of epilepsy, with high risk of potentially fatal aplastic anemia and/or liver failure limiting the drug's usage to severe refractory epilepsy.
Lord Norton, a former Oxford classmate of Charles’, tells Yasmin he always knew Charles to be a sexual predator going back to his Oxford days. Later, Yasmin hires Alondra—the woman from the yacht—who implies Charles abused girls as young as twelve and gently suggests Yasmin may have been a victim as well, causing Yasmin to break down. At the end of series 4, Yasmin, who has herself become a predatory figure by trafficking escorts to powerful men, repeatedly listens to Charles' final voicemail inviting her on the boat trip.
The news began spreading immediately: the West German Deutsche Presse-Agentur issued a bulletin at 19:04 which reported that East German citizens would be able to cross the inner German border "immediately". Excerpts from Schabowski's press conference were broadcast on West Germany's two main news programs that night—at 19:17 on ZDF's heute, which came on the air as the press conference was ending, and as the lead story at 20:00 on ARD's Tagesschau. As ARD and ZDF had broadcast to nearly all of East Germany since the late 1950s, were far more widely viewed than the East German channels, and had become accepted by the East German authorities, this is how most of the population heard the news. Later that night, on ARD's Tagesthemen, anchorman Hanns Joachim Friedrichs proclaimed, "This 9 November is a historic day. The GDR has announced that, starting immediately, its borders are open to everyone. The gates in the Wall stand open wide." In 2009, Ehrman claimed that a member of the Central Committee had called him and urged him to ask about the travel law during the press conference, but Schabowski called that absurd. Ehrman later recanted this statement in a 2014 interview with an Austrian journalist, admitting that the caller was Günter Pötschke, head of the East German news agency ADN, and he only asked if Ehrman would attend the press conference.
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.
Cardarine is a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.