The short version of GW501516 fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-03-15 and is reviewed periodically as new material appears.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.
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.
| Property | Value | Notes |
|---|---|---|
| Primary target | PPARδ | Nuclear receptor; not androgen receptor |
| Studied indications | Dyslipidemia; obesity; diabetes | Early clinical research; development discontinued |
| Rodent toxicity | Tumor formation in multiple tissues | Dose-dependent findings in some studies |
| Human approval | None | No approved therapeutic use |
| Typical analytical method | LC-MS/MS | Used for identity and quantification |
Human trials of GW501516 were small and short in duration. They examined lipid levels, glucose handling, and other metabolic markers, but the programs were halted after the animal cancer findings. No approved therapeutic product exists, and published human data are insufficient for establishing long-term safety. Reports of use for athletic performance come mainly from non-clinical settings and cannot be verified through controlled trials. Independent testing of products sold as cardarine has found inconsistent purity and labeling.
Laboratory studies indicate that GW501516 activates PPARδ, a nuclear receptor involved in fatty acid oxidation and energy metabolism. In rodent experiments, treated animals often showed increased endurance and reduced fat mass. These effects were observed under controlled conditions and do not establish safe or effective use in humans. The exact dose-response relationship in humans remains poorly characterized. Species differences in metabolism can affect how results translate across animals and people.
Safety concerns emerged from long-term animal studies. In rodents given the compound for extended periods, researchers found an increased incidence of certain cancers, including liver and bladder tumors. These findings contributed to the discontinuation of clinical development. Whether similar risks apply to short-term or low-level exposure in humans is not established, and controlled human safety data are limited. The relevance of high-dose rodent carcinogenicity findings to human use remains a subject of debate.
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.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
== Phylogeny == The five currently known genera of FAP organisms are Chloroflexus, Choronema, Oscillochloris, Roseiflexus, and Heliothrix. Of these five, only two do not contain chlorosomes: Roseiflexus and Heliothrix. Roseiflexus and Heliothrix are both red due to only having Bchl a as a photosynthetic pigment. In most other aspects, both phenotypically and genetically, the genera Roseiflexus and Heliothrix are different from each other. Little is known about the taxonomy of the Roseiflexus genus due to it only containing one known species: Roseiflexus casternholzii.
== Detailed description == The Aschoff nodules are foci of T lymphocytes, occasional plasma cells, and activated macrophages (Anitschkow cells) pathognomonic of rheumatic fever. These macrophages have abundant cytoplasm and central round nuclei in which chromatin condenses into a central, slender, wavy ribbon, the reason why they are sometimes called "caterpillar cells". They are especially found in the vicinity of small blood vessels in the myocardium and endocardium and occasionally in the pericardium, and also the adventitia of the proximal part of the aorta. Lesions similar to the Aschoff nodules may also be found in extra-cardiac tissues.
=== Biomimetic mineralization === Biomolecules can be incorporated during the MOF crystallization process. Biomolecules including proteins, DNA, and antibodies could be encapsulated within ZIF-8. Enzymes encapsulated in this way were stable and active even after being exposed to harsh conditions (e.g. aggressive solvents and high temperature). ZIF-8, MIL-88A, HKUST-1, and several luminescent MOFs containing lanthanide metals were used for the biomimetic mineralization process. In addition, individual living cells were encapsulated within MOF shells via single-cell nanoencapsulation (SCNE).
In 1876, the former GOCA Freemason and high-ranking member in the Provincial Mother Lodge member Aurelio Almeida y González went on a tour of the United States. Here, he obtained broad support from the Masonic bodies of North America. In July 1876, back in Cuba, the Mother Lodge started asking questions about the money that the Supreme Council had been asking the Lodges to pay, and insisted on a proper accounting – but their effort was suppressed. Later in July, Almeida y González sent a telegraph cable to the Mother Lodge. On July 28, 1876, days after Almeida y González's telegraph arrived in Cuba, the Mother Lodge dissolved itself. On August 1, 1876, representatives from thirteen Cuban lodges (9 chartered lodges and 4 under dispensation) met in Havana to form the Gran Logia de la Isla de Cuba (English: Grand Lodge of the Island of Cuba). Under the charter of the Grand Lodge of Island of Cuba, the Higher Degrees were overseen in Cuba by the Grand Orient of Spain and Práxedes Mateo Sagasta. Within a month, the Grand Lodge of Cuba possessed 17 lodges. The new "Cuban" Freemasonry was effectively a restructuring and reorganization of GOCA Freemasonry and its Lodges, but the Grand Lodge of Cuba was now considered "regular and correct," officially abandoning GOCA's ideology of direct political action. This allowed them to obtain recognition from the majority of Grand Lodges in North America. In mainland Spain, the Spanish Restoration was underway, and the Cuban government was starting to introduce new legislation and freedoms with the aim to end the Ten Years' War.
== Scope of accreditation == NABL's scope for accreditation extends to:- Testing Laboratories: Biological, Chemical, Diagnostic Radiology QA testing, Electrical, Electronics, Fluid-Flow, Forensic, Mechanical, Non-Destructive testing, Photometry, Radiological and Software & IT system testing. Calibration Laboratories: Electro-Technical, Mechanical, Fluid Flow, Thermal & Optical, Radiological, Thermal. Medical Laboratories: Clinical Biochemistry, Clinical Pathology, Haematology & Immunohaematology, Microbiology and Infectious Disease Serology, Molecular Diagnostics, Histocompatibility & Immunogenetics, Medical Imaging, Histopathology, Cytopathology, Flow cytometry, Cytogenetics.
Sources: en.wikipedia.org
== External links == A more advanced video detailing the different types of post-translational modifications and their chemical structures A useful video visualising the process of converting DNA to protein via transcription and translation Video visualising the process of protein folding from the non-functional primary structure to a mature, folded 3D protein structure with reference to the role of mutations and protein mis-folding in disease
== Side effects == Common side effects include abdominal pain, decreased appetite, nausea, erectile dysfunction, feeling tired, dizziness, and urinary retention. Atomoxetine has been found to modestly increase heart rate and blood pressure. A 2020 meta-analysis found that atomoxetine was associated with appetite suppression, weight loss, and hypertension, rating it as a "potentially least preferred agent based on safety" for treating ADHD. The drug can produce insomnia as a side effect, especially in CYP2D6 poor metabolizers, but has less overall risk of insomnia than methylphenidate or amphetamines. As of 2019, safety in pregnancy and breastfeeding is not clear; a 2018 review stated that, "because of lack of data, the treating physician should consider stopping atomoxetine treatment in women with ADHD during pregnancy." Serious side effects may include angioedema, liver problems, psychosis, heart problems, suicide, and aggression. Atomoxetine does not appear to increase the risk of stroke in adults nor the risk of sudden death. On the other hand, the FDA label notes that sudden death, stroke, and heart attack have been reported in association with atomoxetine and that such complications may be more likely in people with pre-existing cardiovascular disease. The drug can dramatically increase blood pressure in people with central autonomic failure, even at very low doses. Rarely, atomoxetine can cause drug-induced liver injury or liver failure. Atomoxetine may increase the likelihood of aggression and hostility in children with ADHD, although such events are rare. The U.S.
== January 18, 1982 (Monday) == A simultaneous crash of four T-38 jets killed the four pilots for the Thunderbirds stunt flying team of the U.S. Air Force, as they were flying in formation at Indian Springs Air Force Auxiliary Field in Nevada in preparation of a flying show set for March. U.S. Army Lieutenant Colonel Charles R. Ray, an assistant military attache in France, was shot and killed, in front of his home in Paris as he was leaving his apartment to drive to his job at the U.S. Embassy. Georges Ibrahim Abdallah, a terrorist from Lebanon who had founded the Lebanese Armed Revolutionary Factions, would be arrested almost three years later in Lyon, convicted of complicity in the murder of Lt. Col. Ray and of the March 31 killing of Israeli diplomat Yacov Barsimantov, and would serve 41 years of a life sentence before being released in 2025. Born: Joanna Newsom, American folk singer; in Grass Valley, California Phạm Phương Thảo, Vietnamese folk singer; in Nghi Lộc district, Nghệ An province Died: Juan O'Gorman, 76, Mexican artist and architect, was found dead from an apparent suicide. Frank C. Baxter, 85, American literature professor and television host of the CBS series Shakespeare on TV and the ABC series Telephone Time, winner of seven Emmy Awards, including Outstanding Male Performer (1954), and 1960 for Outstanding Male Personality (1960). Josef Mai, 94, German fighter ace with 30 victories in World War One; Trent Lehman, 20, former American child actor known for Nanny and the Professor, hanged himself.
Kipa-Williams thought it would be good to have a character that was not "a player" and instead he was shown wanting a committed relationship. Kipa-Williams gave viewers hope of a reconciliation for Ari and Mac, saying "I think there's always a chance for rekindling relationships. Mack has become quite hurt from it all though." Kipa-Williams said events surrounding the break-up would be "heartbreaking". He predicted tears would be shed and was interested in the audience reaction, adding "something happens that almost rips everyone apart..." Writers scripted a pregnancy for Mac, which she keeps secret from Ari as she decides whether or not to have an abortion. The decision is taken out of her hand when she suffers an ectopic pregnancy and miscarries. Mac returns to work at Salt, but when Ari turns up with Mia and attempts to talk to her, Mac cannot face being in the same room as him. Weir said it was "too painful" for Mac, who is "rattled" by his presence. Weir also said that Mac is feeling confused and abandoned by Ari. Shortly after, Mac collapses and Tane takes her to the hospital, where Ari, who has learned the truth about the pregnancy, comforts her as she cries in his arms.
Felines, especially domestic cats, are well known for having penile spines. Upon withdrawal of a cat's penis, the spines rake the walls of the female's vagina, which may serve as a trigger for ovulation. Many other felid species have penile spines, but they are relatively small in jaguars and pumas, and do not occur in margays. Penile spines in chimpanzees and mice are small surface projections made by the piling up of keratinized cell layers in the outermost skin surface. They occur in wombats, koalas, spotted hyenas, fossas, echidnas, primates, bats, and several rodent species. Penile spines are often found in primate species that form copulatory plugs after mating. In galagos, penile spines may form a "genital lock" during copulation.
Sources: en.wikipedia.org
It targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not act primarily on androgen receptors. This distinction separates it from SARMs.
Rodent studies found dose-dependent tumors in several organs. The sponsor discontinued the program over cancer concerns. Human risk from long-term use remains unknown.
Controlled human endurance trials are lacking. Animal studies show increased exercise capacity under some conditions. Anecdotal reports are not equivalent to clinical evidence.
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.