GW501516 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 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
| 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. |
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.
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.
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.
=== Confidence === The formation of the Bellido cabinet was instantly met with opposition, and in the opposition-controlled Congress, there was the risk that Congress would not give trust to the cabinet. Some believed that the Bellido cabinet was a "shock cabinet" with the attempt of baiting Congress into denying confidence twice so that it could be shut down, as it was during the 2019–2020 Peruvian constitutional crisis. A congressman from Free Peru claimed that Congress was attempting to impeach the President, and warned that if trust is denied twice then Congress will be dissolved. While Vice President Dina Boluarte rejected the possibility of dissolving Congress, it nonetheless remained a contentious issue. During the impeachment attempt against former Labor Minister Iber Maraví over his alleged link to Shining Path, then Prime Minister Guido Bellido threatened to use trust to defend Maraví. As a result, Congress passed a law which would reinterpret the question of confidence and would restrict its applicability. Justice Minister Aníbal Torres claimed that this reinterpretation would challenge the constitutional balance of power, and stated that he would challenge the reinterpretation bill via the Constitutional Court. It's worth noting that the makeup of the Constitutional Court is set to be replaced by Congress, as its current term expired in 2019 (the court remained in operation as Congress couldn't agree on successors).
Disease testing: Whether the sex of the fetus is male or female allows the determination of the risk of a particular X-linked recessive genetic disorder in a particular pregnancy, especially where the mother is a genetic carrier of the disorder. Preparation, for any sex-dependent aspects of parenting. Sex selection, which after preimplantation genetic diagnosis may be performed by selecting only embryos of the preferred sex, or, after post-implantation methods by performing sex-selective abortion depending on the test result and personal preference. In comparison to obstetric ultrasonography which is unreliable for sex determination in the first trimester and amniocentesis which carries a small risk of miscarriage, sampling of maternal plasma for analysis of cffDNA is without risk. The main targets in the cffDNA analysis are the gene responsible for the sex-determining region Y protein (SRY) on the Y chromosome and the DYS14 sequence.
corrects this dilution effect by multiplying the fraction of the susceptible population over the total population. It corrects the effective/transmissible interaction between an infectious person and the rest of the community when many of the interaction is immune in the middle to late stages of the disease spreading. Thus, when
The drills continued the following day and were closely monitored by the militaries of both Australia and New Zealand. The New Zealand Government allocates NZ$200 million of funding for the City Rail Link to removing level crossings in order to ease traffic congestion in Auckland. Andrew Bayly resigns as Minister of Commerce and Consumer Affairs after he "placed a hand" on a staff member's upper arm on 18 February, in what Bayly acknowledges as "overbearing" behavior. 22 February: Police investigate five suspected overnight church arson attempts in Masterton. Chinese warships conduct a second live firing exercise in the Tasman Sea. Prime Minister Luxon confirms that Australian and New Zealand naval forces including HMNZS Te Kaha are monitoring the Chinese vessels. 23 February: LGBT supporters gather in Auckland's Albert Park to protest against Destiny Church's disruption of Pride events on 15 February. The New Zealand Police confirm they are investigating graffiti at the former location of Auckland's Kadimah School, which was discovered on 6 February. 24 February – The Police confirmed they have seized 76 gang patches and filed 337 charges for alleged insignia breaches under the Gangs Act 2024. 25 February: Immigration Minister Erica Stanford announces the Government will ease residency rules to recruit more primary school teachers from overseas. Executive director Helen Potiki and legal counsels Nick Whittington and Kristy McDonald KC resign from the second phase of the Royal Commission of Inquiry into COVID-19 Lessons Learned.
Sources: en.wikipedia.org
In 1896, the engineer Wolfram Fuchs, based on his experience with numerous X-ray examinations, recommended keeping the exposure time as short as possible, staying away from the tube, and covering the skin with Vaseline. In 1897, Chicago doctors William Fuchs and Otto Schmidt became the first users to have to pay compensation to a patient for radiation damage. In 1901, dentist William Herbert Rollins (1852-1929) called for using lead-glass goggles when working with X-rays, for the X-ray tube to be encased in lead, and for all areas of the body to be covered with lead aprons. He published over 200 articles on the potential dangers of X-rays, but his suggestions were long ignored. A year later, Rollins wrote in despair that his warnings about the dangers of X-rays were not being heeded by either the industry or his colleagues. By this time, Rollins had demonstrated that X-rays could kill laboratory animals and induce miscarriages in guinea pigs. Rollins' achievements were not recognized until later. Since then, he has gone down in the history of radiology as the "father of radiation protection". He became a member of the Radiological Society of North America and its first treasurer.
== Early life and education == Friedler was born and raised in Haifa, Israel. He studied chemistry at the Hebrew University of Jerusalem, where he completed a Bachelor of Science degree in 1994. He subsequently began doctoral studies in organic chemistry at the Hebrew University under the supervision of Chaim Gilon. He completed his PhD in chemistry, with distinction, in 2000. In the same year, Friedler moved to the United Kingdom, where he was a postdoctoral fellow at the Medical Research Council Centre for Protein Engineering in Cambridge and worked in the laboratory of Sir Alan Fersht.
It has been indicated that one Mn2+ ion is tightly bound to His370, while the second is loosely bound to Asp276. Human prolidase has four crystal structures, HsProl-Mn, HsProl-Na-GlyPro, HsProl-Mg-LeuPro, and HsProl-Mn-Pro. The first of these structures, HsProl-Mn, pertains to the activity of serum prolidase before binding the substrate. Furthermore, HsProl-Na-GlyPro results from substrate degradation caused by the exchange of the Mn2+ ion with Na+. This is caused by the substrate GlyPro binding to the enzyme. The third crystal structure of serum prolidase is HsProl-Mg-LeuPro. This structure functions similarly to HsProl-Na-GlyPro; however, the substrate utilized in this structure is LeuPro. Additionally, Mn2+ is replaced by Mg2+. These differences cause the structure to be more stable with a lower turnover rate. The final crystal structure of serum prolidase is HsProl-Mn-Pro, which employs Pro as the substrate. This Pro comes from the reaction being catalyzed by this enzyme. The crystal structure of prolidase is well-researched and recorded in the Protein Data Bank.
=== PT Prachuap === Townsend left Kanchanaburi following their relegation from the top flight and joined fellow Thai club PT Prachuap in August 2026. In September 2026, Townsend was run over by a pitch roller during warmup for a league match, in what has been described as "a bizarre incident". He reportedly avoided serious injury.
=== Systemic === As its biological causes have been more precisely determined, it has become more widely recognized that while the primary disease process of OI happens in the bones, the most common types of OI—those caused by type I collagen gene mutations—affect virtually all of the human body's organs in some way. Type I collagen is present throughout the circulatory and respiratory systems: from the ventricles of the heart itself, to the heart valves, to the vasculature, it is an integral part of the connective tissue of the lungs. As such, cardiovascular complications, among them aortic insufficiency, aortic aneurysm, and arterial dissections, are sometimes comorbid with OI, but not as frequently as they are comorbid with Marfan syndrome. Respiratory illnesses are a major cause of death in OI. The most obvious source of respiratory problems in OI is pulmonary insufficiency caused by problems in the architecture of the thoracic wall. However, respiratory tract infections, such as pneumonia, are also more fatal among those with OI than the general population. Those with more severe ribcage deformities were found to have worse lung restriction in a small-scale 2012 study involving 22 Italian patients with OI types III and IV, plus 26 non-affected controls. OI—especially its severe form, type III—also has effects on the gastrointestinal system. It was found to be associated with recurrent abdominal pain and chronic constipation in two studies on patients affected by OI.
Sources: en.wikipedia.org
== Different types of Alpha Collagen == Collagen, type I, alpha 1 Collagen, type II, alpha 1 Collagen, type III, alpha 1 Collagen, type IV, alpha 1 Collagen, type V, alpha 1 Collagen, type VI, alpha 1 Collagen, type VII, alpha 1 Collagen, type VIII, alpha 1 Collagen, type IX, alpha 1 Collagen, type X, alpha 1 And many further types of alpha collagen are identified.
=== Osteoclast === Osteoclasts are very large multinucleate cells that are responsible for the breakdown of bones by the process of bone resorption. New bone is then formed by the osteoblasts. Bone is constantly remodeled by the resorption of osteoclasts and created by osteoblasts. Osteoclasts are large cells with multiple nuclei located on bone surfaces in what are called Howship's lacunae (or resorption pits). These lacunae are the result of surrounding bone tissue that has been reabsorbed. Because the osteoclasts are derived from a monocyte stem-cell lineage, they are equipped with phagocytic-like mechanisms similar to circulating macrophages. Osteoclasts mature and/or migrate to discrete bone surfaces. Upon arrival, active enzymes, such as tartrate-resistant acid phosphatase, are secreted against the mineral substrate. The reabsorption of bone by osteoclasts also plays a role in calcium homeostasis.
Although the term was coined in the late 1980s one of the first retroactively recognized examples of a killer application is the VisiCalc spreadsheet, released in 1979 for the Apple II. Because it was not released for other computers for 12 months, people spent US$100 (equivalent to $400 in 2025) for the software first, then $2,000 to $10,000 (equivalent to $9,000 to $44,000) on the requisite Apple II. Byte wrote in 1980, "VisiCalc is the first program available on a microcomputer that has been responsible for sales of entire systems", and Creative Computing's VisiCalc review is subtitled "reason enough for owning a computer". Others also chose to develop software, such as EasyWriter, for the Apple II first because of its higher sales, helping Apple defeat rivals Commodore International and Tandy Corporation. The co-creator of WordStar, Seymour Rubinstein, argued that the honor of the first killer app should go to that popular word processor, given that it came out a year before VisiCalc and that it gave a reason for people to buy a computer. However, whereas WordStar could be considered an incremental improvement (albeit a large one) over smart typewriters like the IBM Electronic Selectric Composer, VisiCalc, with its ability to instantly recalculate rows and columns, introduced an entirely new paradigm and capability unavailable on larger computers. Lotus 1-2-3 similarly benefited sales of the IBM PC. Noting that computer purchasers did not want PC compatibility as much as compatibility with certain PC software, InfoWorld suggested "let's tell it like it is.
The Kingdom of Naples passed to Charles' eight-year-old son, Ferdinand IV of the Two Sicilies, under the tutelage of a regency council dominated by Tanucci. This allowed the continuation of the minister's reform policies, particularly in the ecclesiastical field. This culminated in the expulsion of the Jesuits from the Kingdom in 1769 and the forfeiture of their property. Even after Ferdinand came of age, Tanucci remained in office, but in 1774 he was exonerated at the instigation of Queen Maria Carolina of Austria, who wanted to bring Naples into the Austrian sphere of influence. However, the king continued season, pandering to the Neapolitan Enlightenment (Ferdinando Galiani, Antonio Genovesi and Gaetano Filangeri). During this period Calabria experienced major natural disasters, accompanied by social and economic changes: the plague arrived in 1743, striking Reggio Calabria and its surroundings from Messina, delaying the compilation of the cadastre onciario by local universities. The earthquake of 1783 struck southern Calabria killing some 50,000 and destroying Reggio, which was rebuilt according to more rational and linear architectural criteria. TKing Ferdinand IV sent the prince of Strongoli, Francesco Pignatelli, to cope with emergencies in the earthquake-affected areas. To finance the immense reconstruction expenses, he established the Cassa Sacra, to manage funds derived from the expropriation of abolished ecclesiastical property and monasteries.
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 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.