If you have been reading about GW501516 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.
Last reviewed on 2026-06-27. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
| Property | Value | Notes |
|---|---|---|
| CAS Registry Number | 317318-70-0 | Unique identifier for the compound. |
| Chemical class | PPARδ agonist | Synthetic ligand for peroxisome proliferator-activated receptor delta. |
| Appearance | White to off-white solid | Typical form of research-grade material. |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water. |
| Typical storage | -20°C | Recommended for long-term storage of stock solutions. |
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
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.
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 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.
He then phoned Bouthaina Shaaban, asking her to write a speech for him, and told his presidential office that he was driving home for the night. In truth, Assad left for an airport, secretly boarded an airplane which then flew under the radar with the aircraft's transponder switched off to Khmeimim Air Base from where he fled to Russia. He informed none of his inner circle members or even close family members of his flight, with even his brother Maher al-Assad being left behind. The Telegram account of the Syrian presidency would later publish a statement attributed to Assad, saying that he had gone to a Russian military base in Latakia Governorate "to oversee combat operations" following the fall of Damascus, but was evacuated out of the country by Russia after coming under siege from rebel forces, adding that he had no intention of resigning or going into exile. After the president had disappeared, his media director Kamel Sakr initially told journalists that Assad was going to "deliver a statement very soon". Not long after, he stopped responding to calls, as did Minister of the Interior Mohammad Khaled al-Rahmoun. Government loyalists realized that Assad had fled upon learning that his home was deserted, with the Republican Guard also no longer deployed at his usual residence. As word of his escape spread, the remaining loyalist resistance completely collapsed. During the night, rebels announced that a "group" of senior government officials and military officers in Damascus were preparing to defect to the opposition.
Platelets play one of major roles in the hemostatic process. When platelets come across the injured endothelium cells, they change shape, release granules and ultimately become ‘sticky’. Platelets express certain receptors, some of which are used for the adhesion of platelets to collagen. When platelets are activated, they express glycoprotein receptors that interact with other platelets, producing aggregation and adhesion. Platelets release cytoplasmic granules such as adenosine diphosphate (ADP), serotonin and thromboxane A2. Adenosine diphosphate (ADP) attracts more platelets to the affected area, serotonin is a vasoconstrictor and thromboxane A2 assists in platelet aggregation, vasoconstriction and degranulation. As more chemicals are released more platelets stick and release their chemicals; creating a platelet plug and continuing the process in a positive feedback loop. 5-Hydroxykynurenamine, a metabolite of serotonin, has been found to inhibit serotonin-induced platelet aggregation. This indicates that it may regulate platelet activity during hemostasis and thrombogenesis by modulating the effects of serotonin on blood clot formation. Platelets alone are responsible for stopping the bleeding of unnoticed wear and tear of our skin on a daily basis. This is referred to as primary hemostasis.
A cDNA for this reductase has been cloned from the orchid Bromheadia finlaysoniana. Researchers in Japan have genetically manipulated roses by using RNA interference to knock out the endogenous enzyme and add a gene for an alternative reductase found in an iris; or add a gene for the blue pigment, delphinidin, to create a blue rose, which is being sold worldwide. Dihydrokaempferol 4-reductase is also an enzyme on the lignin biosynthesis pathway. In Arabidopsis thaliana, the enzyme uses sinapaldehyde or coniferyl aldehyde or coumaraldehyde to produce sinapyl alcohol or coniferyl alcohol or coumaryl alcohol respectively.
Sanlúcar de Barrameda is one of the three original towns forming the "triangle of xérès", or sherry-producing towns. (The other two are Jerez de la Frontera, for which sherry is named, and El Puerto de Santa María.) Although a seaside town, Sanlúcar de Barrameda is also home to the oldest horse races in Spain and some of the oldest in Europe. The races take place just before sunset along the beach at the mouth of the river Guadalquivir every August before thousands of spectators. Contested at distances of 1500 m and 1800 m, these were the first regulated horse races in Spain; the riders wear distinctive colours and caps. Other annual events include the Sanlúcar Tapas Fair, a local gastronomy competition; the Feria de la Manzanilla in late May, which is held at the beginning of the Noches de Bajo de Guía flamenco season; classical and jazz festivals; and the occasional concert by a major act. The city is also known for the Romería de El Rocío pilgrimage, one of the more popular expressions of the Roman Catholic faith; it can be compared to the pilgrimages to Santiago or Lourdes. Sanlúcar has had since ancient times a popular taste for bullfighting and has given the world of bullfighting several well-known bullfighters including Manuel Hermosilla y Llanera, José Martínez Ahumada ("Limeño"), Francisco Ojeda González ("Paco" Ojeda), Julio Vega Rodríguez ("Marismeño"), José Luis Parada, and Manuel Rodríguez Blanco ("El Manguin").
Sources: en.wikipedia.org
JRT is the analogue of the lysergamide lysergic acid diethylamide (LSD) in which the embedded tryptamine structure within the ergoline ring system of LSD has been replaced with an isotryptamine structure. Hence, JRT is not an ergoline, lysergamide, or tryptamine itself, but could be considered a cyclized isotryptamine. JRT exists as four enantiomers, including (+)-JRT and (–)-JRT, with (+)-JRT being the active enantiomer and the form used in scientific research.
In November 2004, club doctor Riccardo Agricola was given a 22-month prison sentence and fined €2,000 for sporting fraud by providing performance-enhancing drugs, specifically EPO, to players between 1994 and 1998, Leading hematologist Giuseppe d'Onofrio said that it was "practically certain" that midfielders Antonio Conte and Alessio Tacchinardi had taken EPO to overcome brief bouts of anemia, and that it was "very probable" that seven other players – Alessandro Birindelli, Alessandro Del Piero, Didier Deschamps, Dimas, Paolo Montero, Gianluca Pessotto and Moreno Torricelli – had taken EPO in small doses. In April 2005, the Court of Arbitration for Sport gave the following advisory opinion, in part: "The use of pharmaceutical substances which are not expressly prohibited by sports law, and which cannot be considered as substances similar or related to those expressly prohibited, is not to be sanctioned by disciplinary measures. However, regardless of the existence or not of any judgement rendered by a State court, sports authorities are under the obligation to prosecute the use of pharmaceutical substances which are prohibited by sports law or any other anti-doping rule violation in order to adopt disciplinary measures." In December 2005, Agricola was acquitted of the charges by Turin's court of appeal.
Afterwards, Xi gave a speech, stating he was glad to visit the "beautiful" United States, thanked Trump for the hospitality and said "On behalf of the 1.4 billion and more Chinese people, I wish to begin by extending sincere greetings to the American people and the warm congratulations on the 250th anniversary of the US independence". He said both countries are great countries with great people, and that he was visiting to continue the friendship and expand co-operation. He added that as two major countries, China and the US show "their historic responsibility of advancing human development and progress". He also said that he is ready to "work with Trump to steer the giant ship of the China-US relationship towards a steady future". Xi said that "China and the US are different... but through candid, in-depth, and continued dialogue, our two countries can understand each other better... and build up mutual trust". He stated he and Trump had "respect" for each other and stayed in touch, and that "We should co-operate with sincerity". He said even though cooperation between the two nations "may not solve every problem in the world", it would be hard to solve major problems without it.
=== Hair loss === Studies have reported that PRP is beneficial for alopecia areata and androgenetic alopecia and can be used as an alternative to minoxidil or finasteride. A review reported it to improve hair density and thickness in both genders. A minimum of 3 treatments, once a month for 3 months are recommended, and afterwards a 3-6 month period of continual appointments for maintenance. Factors that determine efficacy include number of sessions, double versus single centrifugation, age, gender, and the injection site.
Solar distillation relies on sunlight to warm and evaporate the water to be purified which then condenses and trickles into a container. In theory, a solar (condensation) still removes all pathogens, salts, metals, and most chemicals but in field practice the lack of clean components, easy contact with dirt, improvised construction, and disturbances result in cleaner, yet contaminated water.
Sources: en.wikipedia.org
=== Simplified clinical approach === Kalra has developed several clinically applicable concepts that simplify obesity management, including bariatric triage, gut guardianship, medical gastronomy, and obesity-friendly language. He has addressed the pathogenesis, comorbidities, and complications of obesity in multiple review papers, including a recent review on MASLD in Endocrine Clinics of North America. Several papers led by Kalra serve as practical guides for clinicians new to obesity management, outlining stepwise protocols for setting up obesity clinics and evaluating and managing obesity.
=== Gel permeation chromatography === The research that appeared to spark an onslaught of modified applications was a gel permeation chromatography technique of fixing poly(isopropyl acrylate) (PIPA) strands to glass beads and separating a mixture of dextrans, which was developed by Gewehr et al. They found that between the temperatures of 25–32 °C, the elution time of dextrans at different molecular weights exhibited a dependence on the temperature. Dextrans of the highest molecular weight eluted first since the PIPA chains exhibit hydrophilicity at temperatures below the LCST. As the temperature of the elution increased, when the chains behave in a more hydrophobic manner, the elution times increased for each of the analytes for the given range. The trend generally applies over the entire temperature range, but there is a flattening of the curve before 25 °C and after 32 °C (the approximate LCST for this experiment). Above the LCST, the PIPA acts as a typical nonpolar stationary phase that would be used in reverse-phased chromatography. There are also instances of the elution times increasing below 15 °C, which most likely can be attributed to the lower temperatures’ effects on mass transfer playing a more significant role on retention than the stationary phase behavior. This study showed that the resolution could essentially be tuned by adjusting the operating temperature. The scope of this study was limited to isothermal conditions and attaching polymer chains to glass beads.
== Targeted protein degradation == In 2001, work from the labs of Craig Crews and Raymond Deshaies described the development of proteolysis-targeting chimeras (PROTACs). Using a small molecule to recruit an E3 ubiquitin ligase to a target protein, this work demonstrated that induced proximity could be used to effect the ubiquitination and proteasomal degradation of a target protein. PROTACs have been frequently applied using the E3 ubiquitin ligases CRBN and VHL to degrade various targets of biological and therapeutic relevance. Multiple groups have sought out additional E3 ligases to co-opt for targeted protein degradation such as FBXO22 and KLHDC2. While PROTACs generally are heterobifunctional compounds linking an E3 ligase binder to a target protein binder, molecular glues also exist that induce protein-protein interactions with E3 ligases, leading to degradation of various substrate proteins. Molecular glues often have been discovered through serendipity, though various methodologies have been explored to expedite the discovery of molecular glues. Biologic modalities for targeted protein degradation have also been explored by fusing E3 ligases to target recognition domains such as nanobodies. These modalities are sometimes referred to as bioPROTACs. While bioPROTACs are advantageous for targeting proteins lacking small molecule ligands, challenges in delivery, pharmacokinetics, and immunogenicity have so far precluded clinical development. Studies exploring different delivery mechanisms have sought to address these shortcomings.
=== Role of U.S. Secretary of State Marco Rubio === On February 3, 2025, Secretary of State Marco Rubio announced his appointment as Acting Administrator of USAID by President Trump and that USAID was being merged into the State Department. The legality of these actions is disputed given the mandate for the agency's creation in the Foreign Assistance Act.It was announced that on February 6, 2025, at 11:59 pm (EST) all USAID direct hire personnel would be placed on administrative leave globally, with the exception of designated personnel responsible for mission-critical functions, core leadership and specially designated programs.
Sources: en.wikipedia.org
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.
No. Cardarine is not an anabolic steroid; it belongs to a different chemical class that targets PPARδ. Steroids act primarily through androgen receptors, while cardarine acts through a nuclear receptor involved in metabolism.
Some rodent studies reported increased endurance and changes in fat metabolism after cardarine exposure. Long-term studies in animals also raised concerns about cancer in certain tissues. Human trial data are limited, so these findings cannot be directly translated to people.
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.