The short version of LC-MS/MS fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-06-27. Anything still debated is marked as such rather than presented as settled.
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.
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic PPARδ agonist | Not a steroid or a selective androgen receptor modulator. |
| Common synonyms | Cardarine, GW501516, GW-501516, endurobol | Names vary by supplier and literature source. |
| Appearance | White to off-white powder | Consistent with many small-molecule research chemicals. |
| Solubility | Low in water; soluble in DMSO and ethanol | Often prepared in organic solvent for laboratory work. |
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid and energy metabolism. |
Clinical development stopped after rodent studies showed tumors at multiple sites. Whether those findings predict human cancer risk remains an open question, but they led sponsors to discontinue programs. Human safety data are limited to small, short-term studies that were not designed to assess cancer risk. Reported effects in those studies included changes in blood lipids, but the evidence is insufficient for medical use. Long-term consequences of nonmedical use are not well characterized. Questions about dose, duration, and individual susceptibility remain unresolved.
Cardarine is a common name for GW501516, an investigational compound developed in the 1990s for metabolic conditions. It acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in lipid and energy metabolism. The compound is frequently mislabeled as a selective androgen receptor modulator, or SARM, but its molecular target is different. GW501516 reached early clinical testing before development was discontinued. It has no approved therapeutic use in any country. The name cardarine is not a formal international nonproprietary name.
Regulatory treatment varies, but cardarine is not approved as a medicine. Sports authorities list GW501516 as a prohibited substance, and it is banned at all times under the World Anti-Doping Agency code. Many countries restrict sales for human consumption, while online vendors market it as a research chemical. Such products may lack purity data, and their actual contents can differ from the label. Purchasing or possessing cardarine may carry legal consequences depending on jurisdiction. The compound is not a dietary supplement ingredient in regulated markets.
Anti-doping laboratories identify GW501516 and related metabolites using liquid chromatography coupled with tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be analyzed. The method targets the parent compound and phase I and phase II metabolites, which extend the detection window. Because the substance is prohibited at all times, athletes can be tested outside competition. Detection limits and windows depend on the assay, sample type, and individual metabolism.
Cardarine is frequently described as a fat-burning or endurance-enhancing supplement, but these claims exceed the available evidence. The compound is not a hormone, steroid, or selective androgen receptor modulator. Research articles discuss it as a tool compound for studying PPARδ biology, while anti-doping literature focuses on its abuse and detection. Quality of unapproved products is uncertain, and independent analyses have found impurities or incorrect labeling. Open questions include whether human cancer risk resembles that seen in rodents and how often non-athletes use the substance.
Cardarine has no approved therapeutic indication and is not marketed as a medicine. The World Anti-Doping Agency lists GW501516 as a prohibited substance at all times, covering both in-competition and out-of-competition periods. National laws vary: some countries treat it as an unapproved drug subject to import controls, while others have specific restrictions on sale for human consumption. It is often sold as a research chemical, a label that does not imply safety or legality. Enforcement actions have targeted online vendors and shipments.
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.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
the preoptic area, where LHRH neurons are located, regulating dopamine responses and maternal behavior; the periventricular nucleus, where somatostatin neurons are located, regulating stress levels; the ventromedial hypothalamus, which regulates hunger and sexual arousal.
=== Intergenic ORFs as elementary structural modules === Analysis of the fold potential diversity shows that the majority of the amino acid sequences encoded by the intergenic ORFs of S. cerevisiae are predicted to be foldable. More importantly, these amino acid sequences with folding potential can serve as elementary building blocks for de novo genes or integrate into pre-existing genes.
==== Revision surgery ==== After a breast-augmentation surgery, the patient faces the possibility of a medical complication arising from the physical and the physiological changes undergone by the cut tissues of the body (chest muscles, underlying soft tissues, skin-envelope of the breast hemisphere), thus the surgical wounds are greatly susceptible to external contamination, bacterial infection, and physical damage — especially in the cases of women who underwent a breast-enlargement surgery whilst also undergoing scheduled radiation therapy. A woman with breast cancer usually undergoes a revision surgery to re-establish the symmetry between the nipple-areola complex of each breast and so recreate the natural appearance of her bust (size, form, feel). The rate of revision surgeries was three-point-zero per cent (3.0%) at the seven-year mark, compared to the re-operation rate of twenty per cent (20%) at the three-year mark. The therapeutic indications for a re-operation (revision surgery) of the augmented breast are: medical complications, capsular contracture, shell-rupture of the medical device, leakage of the silicone-gel filler material, and the rupture-and-deflation of the prosthetic breast.
This is achieved, in part, by reactivating foetal haemoglobin production in place of the haemoglobin S that causes sickling. Hydroxyurea lowers the expression of adhesion molecules on endothelial and red blood cells, which lowers the chance of small vessel blockages. Additionally, it encourages the release of nitric oxide, which enhances blood flow and inhibits clot formation. Hydroxyurea had previously been used as a chemotherapy agent. Some concern exists that long-term use may be harmful. A Cochrane review in 2022 found a weak evidence base for its use in sickle cell disease. Despite expanding progress in gene therapy for SCD treatment, hydroxyurea remains a cornerstone first line therapy. However, it is severely underutilized despite the reduction of vaso-occlusive crises by approximately 44% and reduced hospitalizations. In 2019, the United States granted accelerated approval to the medication Voxelotor to treat sickle cell disease. It was approved by the European Medicines Agency (EMA) in 2021. In trials, it had been shown to have disease-modifying potential by increasing haemoglobin levels and decreasing hemolysis indicators However, following an increased risk of vaso-occlusive seizures and death observed in registries and clinical trials, the manufacturer, Pfizer, withdrew it from the market worldwide.
Ross (1971), historian and professor at University of Southern California, 2018 Pulitzer Prize for History finalist Roy Rosenzweig (1971), historian and director of the Center for History and New Media at George Mason University Scott Atran (1972), anthropologist; director at Centre National de la Recherche Scientifique and presidential scholar at John Jay College of Criminal Justice Joel Black (1972), literature and film scholar Michael Gerrard (1972), professor at Columbia Law School Jerome Groopman (1972), Harvard Medical School professor and medical writer for The New Yorker Robert Hymes (1972), professor of Chinese history at Columbia University, winner of two Joseph Levenson Book Prizes George Klosko (1972), professor of philosophy at the University of Virginia Mark J. Roe (1972), professor at Harvard Law School John Servos (1972), professor and historian of science; president of the History of Science Society David Stern (1972), professor of Hebrew literature at Harvard University Tom R. Tyler (1972), professor of psychology at Yale Law School Harold Aram Veeser (1972), professor at City College of New York, known for contribution to new historicism Sean Wilentz (1972), historian and winner of the Bancroft Prize; chair of American Studies at Princeton University Angelo Falcón (1973), political scientist, president and founder of the National Institute for Latino Policy Steven Messner (1973), sociologist, professor of the University at Albany, SUNY, former president of the American Society of Criminology William C.
Sources: en.wikipedia.org
=== France === In France, a clinical biologist (biologiste médical) is a doctor in medicine or pharmacy who has completed a four-year specialization in medical biology. The profession is strictly regulated, and clinical biologists are responsible for overseeing and interpreting laboratory analyses. Their training includes a national competitive exam (internat de biologie médicale), followed by a structured residency program in clinical laboratories. They play a key role in laboratory diagnostics, clinical decision-making, and quality management of biological analyses.
=== Discovery of biomolecules through metagenomics === The advances in modern sequencing technologies in the late 1990s allowed scientists to investigate DNA of communities of organisms in their natural environments ("eDNA"), without culturing individual species in the lab. This metagenomic approach enabled scientists to study a wide selection of organisms that were previously not characterized due in part to an incompetent growth condition. Sources of eDNA include soils, ocean, subsurface, hot springs, hydrothermal vents, polar ice caps, hypersaline habitats, and extreme pH environments. Of the many applications of metagenomics, researchers such as Jo Handelsman, Jon Clardy, and Robert M. Goodman, explored metagenomic approaches toward the discovery of biologically active molecules such as antibiotics.
In the United Kingdom, it is a criminal offence to sell, supply, or import any medicinal product containing kava for human consumption. It is legal to possess kava for personal use or to import it for purposes other than human consumption (e.g., for animals). Until August 2018, Poland was the only EU country with an "outright ban on kava" and where the mere possession of kava was prohibited and may have resulted in a prison sentence. Under the new legislation, kava is no longer listed among prohibited substances and it is therefore legal to possess, import, and consume the plant, but it remains illegal to sell it within Poland for the purpose of human consumption. In the Netherlands the ban was never lifted, and it is still prohibited to prepare, manufacture, or trade kava or goods containing kava. Due to safety concerns, including reports of hepatotoxicity and limitations in clinical evidence, the Committee on Herbal Medicinal Products (HMPC) concluded in 2017 that the benefit-risk balance for the oral use of kava in the treatment of anxiety disorders is unfavorable, and therefore a European Union herbal monograph could not be established.
=== Bleeding === Bleeding is a known side effect of apixaban. The likelihood of bleeding increases when it is combined with other medications that affect blood clotting, such as anticoagulants, aspirin, antiplatelet medications, selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and nonsteroidal anti-inflammatory drugs (NSAIDs). Large clinical trials, including the ARISTOTLE trial, have shown that these combinations can modestly raise the risk of major bleeding. In clinical practice, healthcare providers carefully assess each patient's individual risk to ensure apixaban is used safely and effectively. In some cases, patients may also report fatigue or tiredness, which can occur as a secondary effect related to anemia or blood loss rather than a direct pharmacological action of apixaban. Andexanet alfa is a US Food and Drug Administration (FDA) approved antidote for apixaban in people with uncontrolled and life-threatening bleeding events. Andexanet alfa was voluntarily withdrawn from the U.S. market effective December 22, 2025.
== Regulation == In Arabidopsis, two chains of catalytic ALS (InterPro: IPR012846) is complexed with two regulatory small subunits (InterPro: IPR004789), AHASS2 and AHASS1. Such an arrangement is widespread in both bacterial and eukaryotic ALS. The hetromeric structure was demonstrated in E. coli in 1984 and in eukaryotes (S. cerevisiae and Porphyra purpurea) in 1997. Most of the regulatory proteins have an ACT domain (InterPro: IPR002912) and some of them have a NiKR-like C-terminal (InterPro: IPR027271) In bacteria (E. coli)), Acetolactate synthase consists of three pairs of isoforms. Each pair includes a large subunit, which is thought to be responsible for catalysis, and a small subunit for feedback inhibition. Each subunit pair, or ALS I, II, and III respectively, is located on its own operon, ilvBN, ilvGM, and ilvIH (where ilvN regulated ilvB, and vice versa). Together, these operons code for several enzymes involved in branched-chain amino acid biosynthesis. Regulation is different for each operon.
Sources: en.wikipedia.org
Between 2012 and 2017, the birth rate was 14.3 per thousand and the mortality rate was 10.4 per thousand: even though the Rate of natural increase is positive it does not compensate for the clearly negative net migration rate (-0.7%). In 2017 19% of Le Havre's population was under 15 years old and 39% were under 30 years old, which was above the average for metropolitan France. 24% of men and 26% of women were over 60 years old. The most populous quarters are the city centre, Sanvic, Caucriauville, Anatole France/Danton and Côte Ouest/Ormeaux. In 2009 the foreign population was estimated at 8,525 persons or 4.8% of the population. 12,148 immigrants lived in Havre, or 6.8% of the urban population. Most had North African (5060) or African (3114) origins. With the economic changes that have affected the city, the Professions and Socio-professional categories (PCS) have changed dramatically since the 1980s: between 1982 and 1999, the number of workers has declined by about a third (−10,593), their share of the active labour force was 16% in 1982 and 12.5% in 1999. The population of workers is concentrated in the southern suburbs close to the port and the industrial zone. At the same time the numbers of executives and intellectual professions increased by 24.5%, which is explained in part by the creation and development of the University of Le Havre. In 2017 the city had a lower proportion of managers and intellectual occupations than the national average (14.4% against 18.1%). The proportion of workers (22.5%) was higher than the national average (19.9%).
Cycling extract is a cell-free system derived from Xenopus eggs that autonomously undergoes repeated S phase and M phase cycles. It is prepared by artificially inducing intracellular responses that mimic fertilization, typically through calcium ionophore treatment or electrical stimulation of unfertilized eggs, followed by mechanical crushing of the eggs. This extract has been instrumental in elucidating fundamental mechanisms of cell cycle regulation. For example, it revealed that entry into M phase depends on the translation of cyclin B, which in turn activates maturation promoting factor (MPF). Cycling extracts are primarily used to study the regulation of cell cycle progression.
== Mechanism of action == Moxonidine is a selective agonist at the imidazoline receptor subtype 1 (I1). This receptor subtype is found in both the rostral ventro-lateral pressor and ventromedial depressor areas of the medulla oblongata. Moxonidine therefore causes a decrease in sympathetic nervous system activity and, therefore, a decrease in blood pressure. Compared to the older central-acting antihypertensives, moxonidine binds with much greater affinity to the imidazoline I1-receptor than to the α2-receptor. In contrast, clonidine binds to both receptors with near equal affinity. Moxonidine has an affinity for I1 that is 33 times greater than α2, compared to clonidine which is only four times greater. In addition, moxonidine may also promote sodium excretion, improve insulin resistance and glucose tolerance and protect against hypertensive target organ damage, such as kidney disease and cardiac hypertrophy.
The Netherlands Ministry of Education funds most public universities. Dutch citizens and those from European Union countries pay an annual tuition fee for their first bachelor's or master's degree; the fee was €1,951 in 2015. Non-European Union students and students who want to complete a second bachelor's or master's degree pay a legal school fee. Annually, these legal school fees range between €7,000 for bachelor programs and €30,000 for master's programs in medicine. The Ministry of Education supervises all universities, including private institutions.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist. It is not a steroid or a selective androgen receptor modulator. It was developed and studied as a research compound for metabolic pathways.
It binds to and activates PPARδ, a nuclear receptor that regulates genes related to fatty acid oxidation and energy use. This activation alters transcription in tissues such as skeletal muscle and liver. The full range of downstream effects in humans is not fully established.
No, cardarine is not known to occur naturally in plants, animals, or humans. It is a synthetic molecule produced for laboratory research. Products labeled as cardarine should therefore be treated as manufactured chemicals with variable purity.
It binds to and activates PPAR delta, a nuclear receptor that controls expression of genes related to fatty acid oxidation. This mechanism can alter energy metabolism in animal models. It is not a direct stimulant or fat-burning enzyme.