GW501516 is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2025-10-07. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Published literature on cardarine includes in vitro assays, rodent experiments, and a small number of human studies. Reports describe effects on exercise capacity and lipid metabolism in animals, while human evidence is sparse. Many online descriptions present the compound as a proven endurance aid, a claim not supported by regulatory approval or large clinical trials. Analytical studies focus on identifying the parent compound and its metabolites in biological samples. Important uncertainties include species differences, dose-response relationships, and the relevance of rodent tumor findings to humans.
Cardarine is the common name for GW501516, a synthetic compound studied as a peroxisome proliferator-activated receptor delta agonist. Researchers developed it to explore treatments for lipid disorders and metabolic conditions. It is not an approved medicine in any country. Early clinical work examined changes in HDL cholesterol and triglycerides, but development was discontinued after animal studies raised concerns about cancer. The compound remains available as a research chemical and appears in discussions of performance enhancement.
At the molecular level, GW501516 binds and activates PPARδ, a nuclear receptor that regulates transcription. Activation shifts expression of genes involved in fatty acid oxidation, energy expenditure, and lipid transport in skeletal muscle and liver. Animal studies report increased endurance and altered lipid profiles after exposure. Human data are limited to small trials and do not establish long-term safety or efficacy. PPARδ also has roles in cell proliferation, so the relationship between activation and cancer risk remains an open question.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual description for typical solid reference material. |
| Solubility | Poorly soluble in water; soluble in DMSO | Solubility depends on solvent, purity, and form. |
| Storage | Cool, dry, protected from light | Long-term storage often uses low temperature and desiccant. |
| Common analytical method | LC-MS/MS | Used for detection and quantification in biological matrices. |
| Common synonyms | GW-501516; GW501516; endurobol | Naming varies among literature, vendors, and databases. |
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.
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.
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 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.
=== Depression === Amphetamine was used to treat depression starting in the 1930s and has been described as the first antidepressant. In clinical studies in the 1970s and 1980s, psychostimulants, including amphetamine and methylphenidate, were found to transiently improve mood in a majority of people with depression and to increase psychomotor activation in almost all individuals. Some clinical trials that used lisdexamfetamine as an add-on therapy with a selective serotonin reuptake inhibitor (SSRI) or serotonin-norepinephrine reuptake inhibitor (SNRI) for treatment-resistant depression indicated that this is no more effective than the use of an SSRI or SNRI alone. Other studies indicated that psychostimulants potentiated antidepressants, and were under-prescribed for treatment-resistant depression. In those studies, patients showed significant improvement in energy, mood, and psychomotor activity. Clinical guidelines advise caution in the use of stimulants for depression and advise them only as second- or third-line adjunctive agents. In February 2014, Shire announced that two late-stage clinical trials had found that Vyvanse was not an effective treatment for depression, and development for this indication was discontinued. A 2018 meta-analysis of randomized controlled trials of lisdexamfetamine for antidepressant augmentation in people with major depressive disorder—the first to be conducted—found that lisdexamfetamine was not significantly better than placebo in improving Montgomery–Åsberg Depression Rating Scale scores, response rates, or remission rates.
Blood dyscrasias (e.g., agranulocytosis, leukopenia, and neutropaenia), which is more common in patients on clozapine. Metabolic syndrome and other metabolic problems such as type II diabetes mellitus — particularly common with clozapine, olanzapine and zotepine. In American studies African Americans appeared to be at a heightened risk for developing type II diabetes mellitus. Evidence suggests that females are more sensitive to the metabolic side effects of first-generation antipsychotic drugs than males. Metabolic adverse effects appear to be mediated by antagonizing the dopamine D2, the histamine H1 and serotonin 5-HT2C receptors and perhaps by interacting with other neurochemical pathways in the central nervous system. Neuroleptic malignant syndrome, a potentially fatal condition characterized by: Autonomic instability, which can manifest with tachycardia, nausea, vomiting, diaphoresis, etc. Hyperthermia — elevated body temperature. Mental status change (confusion, hallucinations, coma, etc.) Muscle rigidity Laboratory abnormalities (e.g., elevated creatine kinase, reduced iron plasma levels, electrolyte abnormalities, etc.) Pancreatitis QT interval prolongation — more prominent in those treated with amisulpride, pimozide, sertindole, thioridazine and ziprasidone. Torsades de pointes Seizures, particularly in people treated with chlorpromazine and clozapine. Thromboembolism Myocardial infarction Stroke Pisa syndrome Some atypical antipsychotics are associated with considerable weight gain, diabetes, and the risk of metabolic syndrome.
For example, a green solution of trivalent chromium sulfate or chloride refuses to crystallize without slowly changing into the violet form, even if boiled until it concentrates into a tarry mass. When suspended in the waterglass solution, that tar forms downward twig-like growths. This is because all the fluid inside the membrane is too dense to float and thereby exerts a downward force. The concentration of sodium silicate becomes important in growth rate. After the growth has ceased, the sodium silicate solution can be removed by a continuous addition of water at a very slow rate. This prolongs the life of the garden. In one specific experimental variation, researchers produced the chemical garden with a single growth "tube". In many modern chemical garden growth experiments, the solid reactant seed is replaced by the continuous injection of the corresponding reactant solution at a controlled flow rate, or more recently, under controlled osmotic pressure.
The Altıkulaç Sarcophagus, or Çan sarcophagus, is an early 4th century BCE (400–375 BCE) sarcophagus. It is sometimes said to be in the Greco-Persian style. The sarcophagus was found in 1998 in a circular corbel-vaulted tomb within the Çingenetepe tumulus, in the village of Altıkulaç, near Çan, in the eastern Troad, about halfway between Troy and Daskyleion, in what was anciently Hellespontine Phrygia. It was looted and damaged in the process, but a large part of the reliefs remained intact. It is made of painted marble carved in low relief, and dated to the 1st quarter 4th century BCE. It was made at about the same time as the famous tombs in Lycia. The sarcophagus can probably be attributed to an Anatolian dynast of Hellespontine Phrygia. The longer face of the sarcophagus is decorated with two hunting scenes, the hunting of a fallow buck on the left portion, and the hunting of a boar on the right portion. The shorter face of the sarcophagus is decorated with a battle scene, with a mounted, armoured warrior, accompanied by his henchman, spearing a fallen light-armed soldier, probably a Greek psilos. The rider was almost certainly the dynast to whom the sarcophagus belonged. His henchman, judging from his appearance, was probably a Greek mercenary in the service of the cavalryman, a common occurrence at the time. The other two sides are undecorated. The sarcophagus nevertheless derives from a long tradition of royal iconography in the Near East, especially visible in the tombs of Asia Minor.
Additionally, francium superoxide (FrO2) is expected to have significant covalent character, unlike the other alkali metal superoxides, because of bonding contributions from the 6p electrons of francium.
Sources: en.wikipedia.org
=== Mutations === Mutations in myostatin do more than just affect the amount of muscle mass an organism can produce; they also have variable effects on other phenotypes for different species. For example, a Belgian Blue bovine with a mutation that inhibits myostatin production will exhibit a dramatic increase in muscle mass but will also lead to dystocia. Other species with myostatin deficiency mutation such as humans or Whippet dogs do not get obstructed labor.
Panamanian President Juan Carlos Varela announced Noriega's death shortly before midnight, writing, "The death of Manuel A. Noriega closes a chapter in our history; his daughters and his relatives deserve to bury him in peace." Noriega was cremated.
Sandbuster Sand-Resistant Oil SPF 2 Tropical Deluxe SPF 4 Mega-Tan SPF 4 Mademoiselle (SPF 4, SPF 8, and SPF 15) All Day (SPF 4, SPF 8, SPF 15, SPF 30, Kids SPF 30, and Gentle Block SPF 30) SPF + Color (SPF 8, SPF 15, SPF 20) - line renamed to "Sunless Tanning Creme with Sunblock" Sunless (Light, Dark, Deep Dark, Tanning Spray Dark, and Tanning Spray Deep Dark) Apres Soleil After Sun Revitalizing Aloe Mist Apres Soleil After Sun Moisture Replenishing Lotion Orange Gelee (SPF 4, SPF 8, SPF 15, and SPF 30) Ecran Solaire (SPF 15 and SPF 30 Kids) - Canada Product development scientists at Pfizer CHCG were John A. Scott (group manager), Alice Scheiner (after sun and high-SPF products), Eric M. Stroud (sunless products), Judy Meyer, Andrew Ortega, and Mary Williams (packaging). Two innovations in 1,3-dihydroxyacetone stability were invented during this time. The entire brand was eventually divested on October 7, 1999, to Schering-Plough.
At the end of its ten-year license, BMS re-formulated Videx as Videx EC and patented that, which reformulation the FDA approved in 2000. The new formulation is a smaller capsule containing coated microspheres instead of using a buffering compound. It is approved by the FDA for once-a-day dosing. Also at the end of that ten-year period, the NIH licensed didanosine to Barr Laboratories under a non-exclusive license, and didanosine became the first generic anti-HIV drug marketed in the United States. One of the patents for ddI expired in the United States on 29 August 2006, but other patents extend beyond that time.
Sources: en.wikipedia.org
Neutron capture reactions (n,γ), which are represented in the figure by a short right arrow. The (n,2n) reactions and the less frequently occurring (γ,n) reactions are also taken into account, both of which are marked by a short left arrow. Even more rarely and only triggered by fast neutrons, the (n,3n) reaction occurs, which is represented in the figure with one example, marked by a long left arrow. In addition to these neutron- or gamma-induced nuclear reactions, the radioactive conversion of actinide nuclides also affects the nuclide inventory in a reactor. These decay types are marked in the figure by diagonal arrows. The beta-minus decay, marked with an arrow pointing up-left, plays a major role for the balance of the particle densities of the nuclides. Nuclides decaying by positron emission (beta-plus decay) or electron capture (ϵ) do not occur in a nuclear reactor except as products of knockout reactions; their decays are marked with arrows pointing down-right. Due to the long half-lives of the given nuclides, alpha decay plays almost no role in the formation and decay of the actinides in a power reactor, as the residence time of the nuclear fuel in the reactor core is rather short (a few years). Exceptions are the two relatively short-lived nuclides 242Cm (T1/2 = 163 d) and 236Pu (T1/2 = 2.9 y). Only for these two cases, the α decay is marked on the nuclide map by a long arrow pointing down-left.
== Function == The Hsp70 system interacts with extended peptide segments of proteins as well as partially folded proteins to cause aggregation of proteins in key pathways to downregulate activity. When not interacting with a substrate peptide, Hsp70 is usually in an ATP bound state. Hsp70 by itself is characterized by a very weak ATPase activity, such that spontaneous hydrolysis will not occur for many minutes. As newly synthesized proteins emerge from the ribosomes, the substrate binding domain of Hsp70 recognizes sequences of hydrophobic amino acid residues, and interacts with them. This spontaneous interaction is reversible, and in the ATP bound state Hsp70 may relatively freely bind and release peptides. However, the presence of a peptide in the binding domain stimulates the ATPase activity of Hsp70, increasing its normally slow rate of ATP hydrolysis. When ATP is hydrolyzed to ADP the binding pocket of Hsp70 closes, tightly binding the now-trapped peptide chain. Further speeding ATP hydrolysis are the so-called J-domain cochaperones: primarily Hsp40 in eukaryotes, and DnaJ in prokaryotes. These cochaperones dramatically increase the ATPase activity of Hsp70 in the presence of interacting peptides.
=== Religion === As of 2011, 41.5% identified themselves as Christian, 18.6% Muslim, 17.8% Hindu and 10.6% with no religion. Brent is home of the Neasden Temple, once the largest Hindu Mandir outside India; and JFS, the largest Jewish school in Europe. There is also an Islamic school called Islamia Primary School founded by Cat Stevens. The following table shows the religious identity of residents residing in Brent according to the 2001, 2011 and the 2021 censuses.
== Structure == Glutamine can exist in either of two enantiomeric forms, L-glutamine and D-glutamine. The L-form is found in nature. Glutamine contains an α-amino group which is in the protonated −NH3+ form under biological conditions and a carboxylic acid group which is in the deprotonated −COO− form, known as carboxylate, under physiological conditions.
=== Nicaragua === The Castillo Administration refused to recognize the results of the 2021 Nicaraguan general election, saying it did not meet the minimum criteria for free elections. Free Peru's leader Vladimir Cerrón blamed Foreign Minister Óscar Maúrtua for the refusal to recognize Nicaragua's election. Cerrón released a statement saying "Regrettable position adopted by the Ministry of Foreign Affairs - Foreign Ministry of Peru, regarding the elections in Nicaragua, the same position adopted by the reactionary forces to ignore the electoral victory of Pedro Castillo."
Sources: en.wikipedia.org
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.
Most methods use liquid chromatography with tandem mass spectrometry. Urine is common in anti-doping testing, and blood or plasma may be used in research.
Typical guidance is cool, dry, dark storage, often at low temperature and with desiccant. Stability data are limited, so storage conditions should be verified for each batch or supplier.
Cardarine is a common name for the investigational compound GW501516. It acts as a PPARδ agonist and is not approved for human use. It is prohibited in sport.