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.
Updated 2025-08-16. Numbers and descriptions here follow the published literature rather than marketing material.
Laboratory studies have examined GW501516 in cell cultures and rodents for conditions such as dyslipidemia, insulin resistance, and obesity. Some trials in humans were initiated, but development was discontinued after preclinical findings raised concerns about cancer in certain models. Those findings do not prove that the compound causes cancer in people, but they contributed to regulatory caution. Later reviews often describe the evidence as preliminary and insufficient for assessing long-term safety.
In the fitness and bodybuilding literature, cardarine is frequently discussed as an endurance agent or fat-loss compound, although such claims are not supported by robust clinical evidence. Online descriptions often mix animal data, user anecdotes, and marketing language. Researchers who study PPARδ agonists distinguish between receptor activation in controlled experiments and unsupervised use of unverified products. The latter introduces unknown purity, dose, and interactions, making reported experiences difficult to interpret scientifically.
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.
| Property | Value | Notes |
|---|---|---|
| Solubility | Soluble in dimethyl sulfoxide and some organic solvents; practically insoluble in water | Solvent choice affects laboratory handling |
| Typical storage | -20 °C, desiccated, protected from light | Common condition for research samples |
| Analytical method | Liquid chromatography–tandem mass spectrometry (LC-MS/MS) | Used for identification and quantification in biological or product samples |
| Common synonyms | GW501516, GW-501516, GSK-516, Endurobol | Names found in research and anti-doping literature |
| Regulatory status | Unapproved therapeutic; prohibited in competitive sport | Status can vary by country and context |
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.
Analytical laboratories typically identify cardarine and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is a common matrix in anti-doping testing, while blood and tissue may be used in research settings. Detection windows depend on the assay, the sample matrix, and the compound's metabolism. Because cardarine is extensively metabolized, laboratories often target specific metabolites to improve sensitivity and confirmation. Reference standards are required for reliable quantification. Method validation includes checks for selectivity, linearity, and carryover.
A persistent misconception is that cardarine is a fat-burning drug or a safe alternative to anabolic steroids. No approved therapeutic product exists, and human safety data are limited. The tumor findings in rodents remain a central concern in scientific reviews. Products sold online may contain inaccurate labels, impurities, or different compounds entirely, which complicates any assessment of effects. Independent testing of such products has reported frequent mislabeling. For these reasons, discussions in the literature emphasize risks and unknowns rather than benefits.
Cardarine is not approved for human therapeutic use in any major jurisdiction. It appears on the World Anti-Doping Agency Prohibited List as a PPARδ agonist within the hormone and metabolic modulators category. Sports organizations test for it because it has been detected in athlete samples and seized products. Regulatory actions against marketed research chemical versions have occurred in several countries, though enforcement varies. Availability through unregulated channels complicates oversight.
Banting stated that the reporter had betrayed his confidence, but did not retract his statement and reaffirmed that HBC was responsible for the death of indigenous residents by supplying the wrong kind of food and introducing diseases into the Arctic. As A. Y. Jackson notes in his memoir, since neither the governor nor the general manager had been to the Arctic, the meeting ended with them asking Banting's advice on what HBC ought to do: "He gave them some good advice and later he received a card at Christmas with the Governor's best wishes."
Nanotechnology. Actin-myosin systems act as molecular motors that permit the transport of vesicles and organelles throughout the cytoplasm. It is possible that actin could be applied to nanotechnology as its dynamic ability has been harnessed in a number of experiments including those carried out in acellular systems. The underlying idea is to use the microfilaments as tracks to guide molecular motors that can transport a given load. That is actin could be used to define a circuit along which a load can be transported in a more or less controlled and directed manner. In terms of general applications, it could be used for the directed transport of molecules for deposit in determined locations, which would permit the controlled assembly of nanostructures. These attributes could be applied to laboratory processes such as on lab-on-a-chip, in nanocomponent mechanics and in nanotransformers that convert mechanical energy into electrical energy.
This is evidenced by different projections of AgRP neurons to various areas of the brain driving different food related behaviors; for example, certain projections will promote increased food consumption, but not increased food odor investigation.
Although a systematic survey has not been done to identify all chemosynthetic communities in the Gulf of Mexico, there is evidence indicating that many more such communities may exist. The depth limits of discoveries probably reflect the limits of exploration (lack of submersibles capable of depths over 1,000 metres (3,300 feet)). MacDonald et al. (1993 and 1996) have analyzed remote-sensing images from space that reveal the presence of oil slicks across the north-central Gulf of Mexico. Results confirmed extensive natural oil seepage in the Gulf of Mexico, especially in water depths greater than 1,000 metres (3,300 feet). A total of 58 additional potential locations were documented where seafloor sources were capable of producing perennial oil slicks. Estimated seepage rates ranged from 4 bbl/d (0.64 m3/d) to 70 bbl/d (11 m3/d) compared to less than 0.1 bbl/d (0.016 m3/d) for ship discharges (both normalized for 1,000 mi2 (640,000 ac)). This evidence considerably increases the area where chemosynthetic communities dependent on hydrocarbon seepage may be expected. The densest aggregations of chemosynthetic organisms have been found at water depths of around 500 metres (1,600 feet) and deeper. The best known of these communities was named Bush Hill by the investigators who first described it. It is a surprisingly large and dense community of chemosynthetic tube worms and mussels at a site of natural petroleum and gas seepage over a salt diapir in Green Canyon Block 185.
Folgers is an American brand of coffee produced and sold in the United States, with additional distribution in Asia, Canada and Mexico. It forms part of the food and beverage division of the J.M. Smucker Company. Folgers roasts its coffee in New Orleans.
Sources: en.wikipedia.org
An insulin pump allows the replacement of slow-acting insulin for basal needs with a continuous infusion of rapid-acting insulin. The insulin pump delivers a single type of rapid-acting insulin in two ways:
Physical presence may be required for women who are in relationships for the testosterone–partner interaction, where same-city partnered women have lower testosterone levels than long-distance partnered women.
=== Preclinical === CF-602 – adenosine A3 receptor modulator – erectile dysfunction [36] S1B-307 – "central nervous system modulator" – anorgasmia, female sexual dysfunction [37] S1B-408 – undefined mechanism of action – anorgasmia [38] S1B-3006 (S1B0-3006; S1B3006) – "central nervous system modulator" – sexual function disorders [39]
The aromatic acids 3-phenylpropionic acid (3PPA) and 3-(4-hydroxyphenyl)propionic acid (HPPA) are important commodities used in the chemical, pharmaceutical, and food industrial sectors. A biosynthetic route to synthetize these compounds was designed by combining the Escherichia coli phenylalanine pathway with non-native enzymes like tyrosine ammonia lyase (TAL) and the clostridial EnoR. The full pathway was assembled in Escherichia coli, which led to the production of HPPA and cinnamyl alcohol. Optimization of individual enzyme expression levels produced 3PPA and HPPA with a concentration of 367 and 225 mg/L, in this case the oxygen-sensitive EnoRs were catalytically active under the microaerophilic fermentation conditions. The 2-methylsuccinic acid (2-MSA) is used to synthetize polymers that have application as bioplastics, cosmetic solvents and coatings. A pathway for its synthesis was designed using Escherichia coli, combining native pyruvate and acetyl-CoA biosynthesis with methanogenic citramalate synthase (CimA), isopropylmalate isomerase (LeuCD), and the ER YqjM or KpnER from Klebsiella pneumoniae. The successful production of 2-MSA was achieved with a concentration of 0.96 g/L using KpnER.
=== Organic and inorganic synthesis === Due to its explosion hazard, sodium azide is of only limited value in industrial-scale organic synthesis. In the laboratory, it is used to introduce the azide functional group by displacement of halides. The azide functional group can thereafter be converted to an amine by reduction with either SnCl2 in ethanol or lithium aluminium hydride or a tertiary phosphine, such as triphenylphosphine in the Staudinger reaction, with Raney nickel or with hydrogen sulfide in pyridine. Oseltamivir, an antiviral medication, is currently produced in commercial scale by a method which utilizes sodium azide. Sodium azide is a versatile precursor to other inorganic azide compounds, e.g., lead azide and silver azide, which are used in detonators as primary explosives. These azides are significantly more sensitive to premature detonation than sodium azide and thus have limited applications. Lead and silver azide can be made via double displacement reaction with sodium azide and their respective nitrate (most commonly) or acetate salts. Sodium azide also can react with the chloride salts of certain alkaline earth metals in aqueous solution, such as barium chloride or strontium chloride to respectively produce barium azide and strontium azide, which are also relatively sensitive primarily explosive materials. These azides can be recovered from solution through careful desiccation.
Sources: en.wikipedia.org
Further studies demonstrate that supportive settings significantly reduce the likelihood of adverse reactions, including panic, paranoia, or psychological distress. Positive therapeutic outcomes are strongly correlated with the participant's trust in the environment and the facilitators.
Notes: % monoesters and HLB reported in this table are the approximative values indicated by the suppliers for each blend. B= Behenate (22 carbon chain) - S = stearate (18 carbon chain) - O = Oleate (18 carbon chain, 1 unsaturation) - P = Palmitate (16 carbon chain) - M = myristate (14 carbon chain) - L = Laurate (12 carbon chain) It means that a transposition of the HLB scale of the PEO surfactants has been made for defining the HLB of sucrose esters, because both families of surfactants are non-ionic surfactants. There are two issues with this transposition. The first one is that in this numerical transposition of the Griffin's scale to sucrose esters, the monoesters content is supposed to correspond the hydrophilic part of the surfactant what is a strong approximation because the monoesters fraction is not purely hydrophilic, since it also contains a high proportion of hydrophobic fatty chains in mass percent. It means also that, for example, a sucrose laurate blend (a sucrose grafted with a 12 carbon fatty acid) and a sucrose stearate blend (a sucrose grafted with a 18 carbon fatty acid) have the same HLB (see Table), despite the fact that sucrose laurates are really more hydrophilic and water-soluble than sucrose stearates. The second issue is that this HLB scale, established for non-ionic PEO surfactants on the basis of experimental data, is valid only for the latter. This scale has a genuine predictive value for choosing the right PEO surfactant for a given application, typically oil-in-water or water-in-oil emulsification.
=== Nucleic acid delivery === Nucleic acid-based macromolecules such as siRNA, antisense oligonucleotide, decoy DNA, and plasmid are promising biological and pharmacological therapeutics in regulation of gene expression. However, unlike other small-molecular drugs, their development and applications are limited by high molecular weight and negative charges, which results in poor uptake efficiency and low cellular traffic. To overcome these problems, several different delivery systems have been developed, including CPP-nucleic acid conjugate, which is a powerful tool.
Clomipramine, sold under the brand name Anafranil among others, is a tricyclic antidepressant (TCA). It is used in the treatment of various conditions, most notably obsessive–compulsive disorder but also many other disorders, including hyperacusis, panic disorder, major depressive disorder, trichotillomania, body dysmorphic disorder and chronic pain. It has also been notably used to treat premature ejaculation and the cataplexy associated with narcolepsy. It may also address certain fundamental features surrounding narcolepsy besides cataplexy (especially hypnagogic and hypnopompic hallucinations). The evidence behind this, however, is less robust. As with other antidepressants (notably including selective serotonin reuptake inhibitors), it may paradoxically increase the risk of suicide in those under the age of 25, at least in the first few weeks of treatment. It is typically taken by mouth, although intravenous preparations are sometimes used. Common side effects include dry mouth, constipation, loss of appetite, sleepiness, weight gain, sexual dysfunction, and trouble urinating. Serious side effects include an increased risk of suicidal behavior in those under the age of 25, seizures, mania, and liver problems. If stopped suddenly, a withdrawal syndrome may occur with headaches, sweating, and dizziness. It is unclear if it is safe for use in pregnancy. Its mechanism of action is not entirely clear but is believed to involve increased levels of serotonin and norepinephrine. Clomipramine was discovered in 1964 by the Swiss drug manufacturer Ciba-Geigy.
Sources: en.wikipedia.org
It binds and activates PPARδ, a nuclear receptor that influences gene expression related to fatty acid metabolism and energy balance. This mechanism has been studied mainly in animals and cell models, not established as a safe human therapy.
No. It is not an anabolic-androgenic steroid; it is a synthetic PPARδ agonist. Because it is banned in sport, it is sometimes grouped with doping agents even though its chemical class differs from steroids.
Human data are limited and development was discontinued, so major effects and long-term risks are not well characterized. Some early studies examined metabolic markers, but they do not provide a basis for unsupervised use.
Rodent studies reported increased endurance and fat oxidation after GW501516 exposure. Long-term studies also found higher rates of some tumors, which led to halted development.