The short version of LC-MS/MS fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-02-28 and is reviewed periodically as new material appears.
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.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Common name | Cardarine | Also called GW501516 and endurobol. |
| Chemical formula | C21H18F3NO3S2 | Molecular weight about 453.5 g/mol. |
| Appearance | White to off-white solid | Form depends on synthesis and purity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, protected from light | Common for research chemicals. |
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.
Laboratory detection of GW501516 commonly uses liquid chromatography coupled with tandem mass spectrometry. The method can identify the parent compound or its metabolites in urine and blood after sample cleanup. Protein precipitation, solid-phase extraction, or enzymatic hydrolysis may precede analysis, depending on the matrix. Reference standards are required for accurate quantification and confirmation. Because the compound is not approved, testing often occurs in anti-doping, forensic, or research settings rather than routine clinical care. Results are reported with limits of detection and quantification.
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 binds and activates PPARδ, a nuclear receptor that influences transcription of genes involved in fatty acid oxidation and energy use. Activation shifts some metabolic pathways in preclinical models, which is why the compound has been studied for lipid disorders and exercise-related endpoints. The exact downstream effects in humans are incompletely mapped. PPARδ is expressed in many tissues, including skeletal muscle, liver, and adipose tissue, so broad activation may have varied consequences. Researchers continue to examine how selective or partial activation might alter the balance between benefits and risks.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
=== Indirect effects of labor division === Gender-based differences in job type, role, sector, and working hours are among the primary contributors to the wage gap. An estimated 75% of the overall wage gap can be attributed to these structural factors, with working hours being the most influential. Even when controlling for working time, educational background, professional experience, qualifications, region, sector, and job position, men's salaries remain approximately 10% higher than those of women.
A small amount of blood (10 millilitres (0.35 imp fl oz; 0.34 US fl oz) per tube) is harvested and spun in a centrifuge for eight minutes at 1300 RPM. A fibrin clot packed with blood-derived growth factors, extracellular matrix and hematopoietic stem cells is fabricated and implanted into the gums above the area of gum recession. Advanced platelet-rich fibrin stimulates tissue growth in the patient's own gums eliminating the need to harvest tissue from the palate or the use of allografting.
=== Urban soils === The British Geological Survey reported the amount and distribution of PAH compounds including parent and alkylated forms in urban soils at 76 locations in Greater London. The study showed that parent (16 PAH) content ranged from 4 to 67 mg/kg (dry soil weight) and an average PAH concentration of 18 mg/kg (dry soil weight) whereas the total PAH content (33 PAH) ranged from 6 to 88 mg/kg and fluoranthene and pyrene were generally the most abundant PAHs. Benzo[a]pyrene (BaP), the most toxic of the parent PAHs, is widely considered a key marker PAH for environmental assessments; the normal background concentration of BaP in the London urban sites was 6.9 mg/kg (dry soil weight). London soils contained more stable four- to six-ringed PAHs which were indicative of combustion and pyrolytic sources, such as coal and oil burning and traffic-sourced particulates. However, the overall distribution also suggested that the PAHs in London soils had undergone weathering and been modified by a variety of pre-and post-depositional processes such as volatilization and microbial biodegradation.
On 30 November, the National Guard claimed a "coup d'état" by Raed al-Matni and Assem Abo Fakhr, where they were arrested together with people related to Syrian government forces, Sources indicated that the incident was an attempted assault on the government building and police headquarters, carried out by "Gandhi Abo Fakhr and a group affiliated with him, in coordination with Suleiman Abdul Baqi, with the aim of "overthrowing al-Sheikh al-Hijri".
=== Endocrinopathies === The most commonly included disorders of the endocrine system are congenital hypothyroidism (CH) and congenital adrenal hyperplasia (CAH). Testing for both disorders can be done using blood samples collected on the standard newborn screening card. Screening for CH is done by measuring thyroxin (T4), thyrotropin (TSH) or a combination of both analytes. Elevated 17α-hydroxyprogesterone (17α-OHP) is the primary marker used when screening for CAH, most commonly done using enzyme-linked immunosorbant assays, with many programs using a second tier tandem mass spectrometry test to reduce the number of false positive results. Careful analysis of screening results for CAH may also identify cases of congenital adrenal hypoplasia, which presents with extremely low levels of 17α-OHP. When the immunoassay method is utilized as a screening method for quantifying 17α-OHP in dried blood spots, it exhibits a significant rate of false positive results. As per the clinical practice guideline issued by the Endocrine Society in 2018, employing LC-MS/MS to measure 17α-OHP and other adrenal steroid hormones (such as 21-deoxycortisol and androstenedione) is recommended as a supplementary screening approach to enhance the accuracy of positive predictions. CH was added to many newborn screening programs in the 1970s, often as the second condition included after PKU.
Sources: en.wikipedia.org
=== The Lancet COVID-19 Commission task force === In November 2020, Richard Horton, editor of The Lancet, appointed economist Jeffrey Sachs as chair of its COVID-19 Commission, with wide-ranging goals relating to the virus and pandemic. Sachs set up a number of task forces, including one on the origins of the virus. Sachs appointed Peter Daszak, a colleague of Sachs' at Columbia, to head this task force, two weeks after the Trump administration prematurely ended a federal grant supporting a project led by Daszak, EcoHealth Alliance, which worked with the Wuhan Institute of Virology. This appointment was criticised as creating a conflict of interest, for instance by Richard Ebright, chemical biologist at Rutgers University, who called the commission an "entirely Potemkin commission" in the National Review. Daszak stated that the task force was formed to "conduct a thorough and rigorous investigation into the origins and early spread of SARS-CoV-2". The task force has twelve members with backgrounds in One Health, outbreak investigation, virology, lab biosecurity and disease ecology. The task force planned to analyse scientific findings and did not plan to visit China. However, as Sachs became increasingly drawn to the lab leak theory, he came into conflict with Daszak and his task force. In June 2021, The Lancet announced that Daszak had recused himself from the commission. On 25 September 2021, the task force work was folded after procedural concerns and a need to broaden its scope to examine transparency and government regulation of risky laboratory research.
In addition to containing the 24-hour ration, the outside of the cardboard box has a range card printed on its side for use by the soldier to record key features and their range from their position. Other variations designed for specific environments exist. The rations are issued with a new folding cooker and fire-lighting fuel called FireDragon made in Wales by BCB International Ltd.
It is the object of various attitudes and emotions, such as concern for others as well as feelings of pity, envy, and ill will. Well-being is the state that egoists seek for themselves, and altruists aim to increase for others. Many disciplines examine or are guided by considerations of well-being, including ethics, psychology, sociology, economics, education, public policy, law, and medicine. The word well-being comes from the Italian term benessere. It entered the English language in the 16th century.
On 11 January 1922, Leonard Thompson, a 14-year-old diabetic who lay dying at the Toronto General Hospital, was given the first injection of insulin. However, the extract was so impure that Thompson had a severe allergic reaction, and further injections were cancelled. Over the next 12 days, Collip worked day and night to improve the ox-pancreas extract. A second dose was injected on 23 January, eliminating the glycosuria that was typical of diabetes without causing any obvious side-effects. The first American patient was Elizabeth Hughes, the daughter of U.S. Secretary of State Charles Evans Hughes. The first patient treated in the U.S. was future woodcut artist James D. Havens; John Ralston Williams imported insulin from Toronto to Rochester, New York, to treat Havens. Banting and Best never worked well with Collip, regarding him as something of an interloper, and Collip left the project soon after. Over the spring of 1922, Best managed to improve his techniques to the point where large quantities of insulin could be extracted on demand, but the preparation remained impure. The drug firm Eli Lilly and Company had offered assistance not long after the first publications in 1921, and they took Lilly up on the offer in April. In November, Lilly's head chemist, George B. Walden discovered isoelectric precipitation and was able to produce large quantities of highly refined insulin. Shortly thereafter, insulin was offered for sale to the general public.
==== Systemic criminality ==== It is often said that all or most users sustain their addiction via crime, however academic Mark Hunter shows that the majority work for extremely low pay, often for other poor people.
Sources: en.wikipedia.org
== External links == Center for Oral History. "Miguel A. Ondetti". Science History Institute. Bohning, James J. (12 January 1995). Miguel Angel Ondetti, Transcript of an Interview Conducted by James J. Bohning at Princeton, New Jersey on 12 January 1995 (PDF). Philadelphia, PA: Chemical Heritage Foundation. Hall of Fame, Inventor Profile: Miguel Ondetti
== Side effects == The most common side effects reported with naltrexone are gastrointestinal complaints such as diarrhea and abdominal cramping. These adverse effects are analogous to the symptoms of opioid withdrawal, as the μ-opioid receptor blockade will increase gastrointestinal motility. The side effects of naltrexone by incidence are as follows:
== Assessments == A December 2024 Gallup poll found that 54% of Americans thought Biden's presidency was below average or poor, 26% average, and 19% above average or outstanding. Gallup found that Americans largely offered negative assessments of Biden's presidency on economic, national, and international issues. Of 18 issue areas Gallup tracked, a majority of Americans said the U.S. lost ground in six, including the economy in general, immigration, and the country's position in the world. A plurality found that the U.S. declined in six other areas, including national infrastructure and energy, education, and trade relations with other countries. A plurality felt the U.S. made progress in only one indicator under Biden: the conditions of gay, lesbian, and transgender people. When Biden left office in 2025, journalists and many Democrats viewed his presidency as a failure due to age and health concerns, public frustration over inflation, and Harris's loss to Trump in the 2024 presidential election. The Guardian called the conclusion of Biden's presidency a "tragedy".
=== As a fumigant === In the beginning of the 20th century sulfur dioxide was used in Buenos Aires as a fumigant to kill rats that carried the Yersinia pestis bacterium, which causes bubonic plague. The application was successful, and the application of this method was extended to other areas in South America. In Buenos Aires, where these apparatuses were known as Sulfurozador, but later also in Rio de Janeiro, New Orleans and San Francisco, the sulfur dioxide treatment machines were brought into the streets to enable extensive disinfection campaigns, with effective results.
Sources: en.wikipedia.org
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.
It activates PPARδ, a nuclear receptor that influences gene expression related to lipid and energy metabolism. Animal studies show changes in endurance and lipid levels. Human effects and risks are not well established.
No, cardarine is not a steroid. It belongs to a different chemical class, the PPARδ agonists. It is also not a selective androgen receptor modulator.
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.