If you have been reading about preclinical models 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 2025-12-08. Numbers and descriptions here follow the published literature rather than marketing material.
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
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.
Stability of GW501516 depends on form, temperature, light exposure, and moisture. Solid reference material is typically stored frozen or refrigerated in a desiccator and protected from light. Solutions in organic solvents such as dimethyl sulfoxide are often kept frozen in aliquots to reduce freeze-thaw cycling. Aqueous solubility is low, so aqueous stock solutions can be difficult to prepare without cosolvents. Degradation may appear as changes in chromatographic purity or mass spectral signal. Stability studies are needed to establish shelf life for any specific preparation.
Quality assessment for cardarine samples usually combines identity, purity, and impurity testing. Nuclear magnetic resonance spectroscopy and mass spectrometry can confirm molecular structure, while high-performance liquid chromatography estimates purity. Certificates of analysis from testing laboratories may list these results, but they do not establish safety or legality. In the absence of approved manufacturing, products sold online may contain the wrong compound, variable amounts, or unlisted contaminants. Independent verification is therefore central to analytical work and to interpreting any reported biological activity.
| 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 |
== See also == Butyric acid α-Aminobutyric acid (homoalanine) 2-Hydroxybutyric acid (α-hydroxybutyric acid) Other oxobutanoic acids 3-Oxobutanoic acid (acetoacetic acid) 4-Oxobutanoic acid (succinic semialdehyde)
== Personal life == Carrey has depression and took Prozac to combat the symptoms for years. He later said that he no longer takes medications of any kind and abstains from coffee, alcohol, and drugs. He received U.S. citizenship in October 2004 and remains a dual citizen of the United States and his native Canada. Carrey owns various properties in Los Angeles and has lived in Brentwood since 1994. In November 2022, the Russian Ministry of Foreign Affairs banned 100 Canadians, including Carrey, from entering Russia as a reciprocity for the international sanctions which had been introduced due to the 2022 Russian invasion of Ukraine.
In the late 20th and early 21st centuries, fishing off the European and American coasts severely depleted stocks and become a major political issue. The necessity of restricting catches to allow stocks to recover upset the fishing industry and politicians who are reluctant to hurt employment.
. The preferred decay channel of those theories is p → e+ + π0. GUT theories find strong support in the convergence of the three Standard Model running coupling constants. These correspond to the fundamental interactions: α1 for the electromagnetic (hypercharge) interaction, α2 for the weak interaction, and α3 for the strong interaction. They follow renormalization group equations: α3 increases at low energies (asymptotic freedom below ~1 GeV), while α1 and α2 decrease, so that they converge, but not exactly meet, at an energy of the order of 1015 GeV, which results to be the natural energy scale of GUTs, as it is displayed in the following Figure.
Sources: en.wikipedia.org
=== Pediatrics === Fever is often viewed with greater concern by parents and healthcare professionals than might be deserved, a phenomenon known as fever phobia, which is based in both caregiver's and parents' misconceptions about fever in children. Among them, many parents incorrectly believe that fever is a disease rather than a medical sign, that even low fevers are harmful, and that any temperature even briefly or slightly above the oversimplified "normal" number marked on a thermometer is a clinically significant fever. They are also afraid of harmless side effects like febrile seizures and dramatically overestimate the likelihood of permanent damage from typical fevers. The underlying problem, according to professor of pediatrics Barton D. Schmitt, is that "as parents we tend to suspect that our children's brains may melt." As a result of these misconceptions parents are anxious, give the child fever-reducing medicine when the temperature is technically normal or only slightly elevated, and interfere with the child's sleep to give the child more medicine.
Static-active stretching includes holding an extended position with just the strength of the muscles such as holding the leg in front, side or behind. Static-active flexibility requires a great deal of strength, making it the hardest to develop.
Dystrophinopathy refers to a spectrum of diseases due to mutations in the DMD gene, which encodes for the dystrophin protein found in muscle. The severe end of the spectrum includes Duchenne muscular dystrophy (DMD), Becker muscular dystrophy (BMD), and DMD-associated dilated cardiomyopathy. The mild end of the spectrum includes asymptomatic increases in serum creatine kinase and muscle cramps with myoglobinuria. Because dystrophin is located on the X chromosome, dystrophinopathy mainly affects males, whereas females range from being carriers, to having delayed-onset and mild disease, to having severe DMD.
Sources: en.wikipedia.org
=== Media === The most influential newspapers in the country were the Rhodesia Herald in Salisbury and The Chronicle in Bulawayo. Following UDI, in 1976, the state-run Rhodesian Broadcasting Corporation (RBC) took over the privately owned Rhodesia Television (RTV) service, in which it had previously acquired a 51 percent stake. Among the news magazines published in Rhodesia under UDI were the Illustrated Life Rhodesia, while The Valiant Years by Beryl Salt told the history of Rhodesia from 1890 to 1978 entirely through the medium of facsimile reproduction of articles and headlines from Rhodesian newspapers.
The melting and boiling points of iron, along with its enthalpy of atomization, are lower than those of the earlier 3d elements from scandium to chromium, showing the lessened contribution of the 3d electrons to metallic bonding as they are attracted more and more into the inert core by the nucleus; however, they are higher than the values for the previous element manganese because that element has a half-filled 3d sub-shell and consequently its d-electrons are not easily delocalized. This same trend appears for ruthenium but not osmium. The melting point of iron is experimentally well defined for pressures less than 50 GPa. For greater pressures, published data (as of 2007) still varies by tens of gigapascals and over a thousand kelvin.
== Surrogate endpoint == A surrogate endpoint (or marker) is a measure of effect of a specific treatment that may correlate with a real clinical endpoint but doesn't necessarily have a guaranteed relationship. The National Institutes of Health (USA) define surrogate endpoint as "a biomarker intended to substitute for a clinical endpoint".
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.
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.