LC-MS/MS is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-05-07. Numbers and descriptions here follow the published literature rather than marketing material.
Regulatory bodies treat GW501516 as a prohibited substance in competitive sport. The World Anti-Doping Agency added it to the prohibited list, and it falls under classes covering metabolic modulators and hormone-related agents. It is not approved by drug regulators for human use, and it is not a lawful dietary supplement. Products sold under the cardarine name may contain unlisted ingredients or different compounds. Because no approved product exists, quality and identity are not guaranteed by pharmaceutical manufacturing standards.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
Anti-doping laboratories detect GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be used in some programs. Detection depends on factors such as dose, timing, metabolism, and the sensitivity of the assay. Published methods describe limits of detection in the low nanogram per milliliter range for related compounds. Exact detection windows are not fixed for all situations and remain an area of ongoing study.
Products sold as cardarine have been found to contain incorrect compounds, variable amounts, or no active ingredient at all. Independent testing is required to verify identity and purity. Common analytical approaches include high-performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance for structural confirmation. These methods can distinguish GW501516 from related PPAR agonists and from unrelated steroids. For regulators and researchers, such verification is central to interpreting both biological results and adverse event reports.
| Property | Value | Notes |
|---|---|---|
| Common name | Cardarine | Common internet and media name. |
| Research code | GW501516 | Also written GW-1516. |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator. |
| Development status | Discontinued | Clinical development halted after rodent cancer findings. |
| Regulatory status | Prohibited in sport | Listed by WADA; not approved as medicine. |
Published studies have examined GW501516 in animal models of obesity, insulin resistance, and exercise endurance. Early human trials reportedly ended, and development was discontinued after preclinical findings raised concerns about cancer in some rodent studies. Regulatory agencies have not approved cardarine for any medical use. Its availability through non-pharmaceutical channels raises questions about identity, purity, and legal status that are separate from its laboratory pharmacology. Those questions are often addressed through analytical testing rather than assumptions about product labels.
Cardarine is a common name for GW501516, also GW-1516, a synthetic compound developed as a peroxisome proliferator-activated receptor delta (PPARδ) agonist. It belongs to a class of agents that modulate gene transcription related to lipid and energy metabolism. The compound was studied in preclinical and early clinical research for metabolic and cardiovascular conditions, but it did not progress to approved therapeutic use. Its name appears in fitness and sports contexts despite not being approved as a drug.
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.
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.
Having a Type V Collagen deficiency has been associated with loss of corneal transparency and classic Ehlers-Danlos syndrome. Studies have shown that an overexpression of Type V Collagen can lead to harmful responses in the body. Collagen V overexpression has been found in cancer, granulation tissue, inflammation and atherosclerosis. It is also linked to fibrosis of the lungs, skin, kidneys, adipose tissue, and liver. Increases in Type V Collagen are associated with both early and advanced hepatic fibrosis. Studies show that increased synthesis of abnormal Type V Collagen is linked to the pathogenesis of Systemic Sclerosis Autoimmunity against type V collagen is associated with lung transplant failure.
In a 2014 paper detailing the experimental results of the chemical characterization of flerovium, the GSI group wrote: "[flerovium] is the least reactive element in the group, but still a metal." Nevertheless, in a 2016 conference about chemistry and physics of heavy and superheavy elements, Alexander Yakushev and Robert Eichler, two scientists who had been active at GSI and FLNR in determining flerovium's chemistry, still urged caution based on the inconsistencies of the various experiments previously listed, noting that the question of whether flerovium was a metal or a noble gas was still open with the known evidence: one study suggested a weak noble-gas-like interaction between flerovium and gold, while the other suggested a stronger metallic interaction. The longer-lived isotope 289Fl has been considered of interest for future radiochemical studies. Experiments published in 2022 suggest that flerovium is a metal, exhibiting lower reactivity towards gold than mercury, but higher reactivity than radon. The experiments could not identify if the adsorption was due to elemental flerovium (considered more likely), or if it was due to a flerovium compound such as FlO that was more reactive towards gold than elemental flerovium, but both scenarios involve flerovium forming chemical bonds.
γ-Butyrolactone (GBL) or gamma-butyrolactone is an organic compound with the formula O=CO(CH2)3. It is a hygroscopic, colorless, water-miscible liquid with a pleasant odor. It is the simplest 4-carbon lactone. It is mainly used as an intermediate in the production of other chemicals, such as N-methyl-2-pyrrolidone. In humans, GBL acts as a prodrug for gamma-hydroxybutyric acid (GHB) and is often used as a recreational drug. GHB acts as a central nervous system (CNS) depressant with effects similar to those of barbiturates.
Bryant, Chad (2009). Prague in Black Nazi Rule and Czech Nationalism. Harvard University Press: Cambridge. ISBN 978-0-674-26166-2. Gruner, Wolf (2015). "Protectorate of Bohemia and Moravia". The Greater German Reich and the Jews: Nazi Persecution Policies in the Annexed Territories 1935–1945. War and Genocide. Berghahn Books. pp. 99–135. ISBN 978-1-78238-444-1. Mahoney, William (2011), The History of the Czech Republic and Slovakia, Santa Barbara: Greenwood Publishing Group, ISBN 978-0-313-36305-4 Miller, Daniel (2005). "The Czech Republic". In Richard C. Frucht (ed.). Eastern Europe An Introduction to the People, Lands, and Culture. Santa Monica: ABC-CLIO. pp. 203–283. ISBN 978-1-57607-800-6. Murray, Williamson (1984). The Change in the European Balance of Power, 1938–1940. Princeton: Princeton University Press. Overy, Richard (1999). "Germany and the Munich Crisis: A Multilated Victory?". In Igor Lukes & Erik Goldstein (ed.). The Munich Crisis, 1938, Prelude to World War II. London: Frank Cass. pp. 191–215. ISBN 0-7146-8056-7. Rothwell, Victor (2001). The Origins of the Second World War. Manchester: Manchester University Press. ISBN 978-0-7190-5958-2. Tooze, Adam (2006). The Wages of Destruction The Making and Breaking of the Nazi Economy. London: Allan Lane. ISBN 978-0-7139-9566-4.
Sources: en.wikipedia.org
Israel–Hezbollah conflict (2023–present): The Ministry of Defence announces that 700 British troops will be deployed to Cyprus in anticipation of an evacuation of British citizens from Lebanon. Starmer advises British nationals in Lebanon to "leave immediately" as tension between Hezbollah and Israel increases. 25 September – Petrol prices fall to their lowest level in three years, with the average price for a litre of unleaded costing about £1.35. 27 September Lexi Secker, a transgender woman who raped a woman on a night out prior to identifying as a woman, is jailed for six and a half years with the sentence to be served in a male prison. Two 13-year-old boys are detained for at least eight and a half years for the 2023 murder of Shawn Seesahai in Wolverhampton, carried out using a machete when they were 12. They are the youngest killers to be sentenced since the murder of James Bulger in 1993. Sir Brian May resigns as vice president of the Royal Society for the Prevention of Cruelty to Animals (RSPCA) over what he describes as "damning evidence" of animal welfare failings related to its food certification label. 28 September – Labour MP Rosie Duffield quits the party over what she describes as leader Keir Starmer's "cruel" policies and "staggering hypocrisy" over his acceptance of gifts. In her resignation letter to Starmer she says, "The sleaze, nepotism and apparent avarice are off the scale.
Their global dissemination is driven in part by horizontal gene transfer on plasmids and has been associated with selection pressure from colistin use, particularly in food-producing animals. Mobile colistin resistance genes also occur in settings without local agricultural colistin use. A 2026 genomic study from New Zealand, where colistin has never been licensed for use in food-producing animals, characterized 71 mcr-positive clinical isolates and compared them with 1,543 mcr-carrying plasmids sampled from 60 countries and regions between 1984 and 2024. The analysis resolved 14 major plasmid lineages associated with different mcr variants and found frequent co-carriage of other antimicrobial-resistance genes, indicating that transmissible plasmid backbones and co-selection by other resistance determinants can contribute to the persistence and dissemination of mcr genes even where direct colistin selection pressure is limited. The emergence of the mcr-9 gene is quite remarkable. Use of colistin to treat Acinetobacter baumannii infections has led to the development of resistant bacterial strains. They have also developed resistance to the antimicrobial compounds LL-37 and lysozyme, produced by the human immune system. This cross-resistance is caused by gain-of-function mutations to the pmrB gene, which controls the expression of lipid A phosphoethanolamine transferases (similar to mcr-1) located on the bacterial chromosome. Similar results have been obtained with mcr-1 positive E.
MVT-602 (other developmental code names RVT-602, TAK-448) is a kisspeptin receptor agonist which is under development for the treatment of female infertility and hypogonadism. It has been found to increase luteinizing hormone levels in premenopausal women. As of March 2021, MVT-602 is in phase 2 clinical trials for the treatment of female infertility and hypogonadism. It was also under development for the treatment of prostate cancer, but development for this indication was discontinued.
Because of imperial expansion, immigration, and trading, ingredients and cooking techniques from other cultures have been integrated into Chinese cuisines over time and Chinese culinary influences have spread worldwide. There are numerous regional, religious, and ethnic styles of Chinese cuisine found within China and abroad. Chinese cuisine is highly diverse and most frequently categorised into provincial divisions, although these province-level classifications consist of many more styles within themselves. During the Qing dynasty, the most praised Four Great Traditions in Chinese cuisine were Chuan, Lu, Yue, and Huaiyang, representing cuisines of West, North, South, and East China, respectively. For example, in Northern China, the dry, temperate climate makes it suitable for the cultivation of wheat, millet and other grains. As such, noodles, porridge and bread are dietary staples. In 1980, a modern grouping from Chinese journalist Wang Shaoquan's article published in the People's Daily newspaper identified the Eight Cuisines of China as Anhui (徽菜; Huīcài), Guangdong (粵菜; Yuècài), Fujian (閩菜; Mǐncài), Hunan (湘菜; Xiāngcài), Jiangsu (蘇菜; Sūcài), Shandong (魯菜; Lǔcài), Sichuan (川菜; Chuāncài), and Zhejiang (浙菜; Zhècài).
With Prussia on the verge of official dissolution (1947), Hanoverian politicians in 1946 took advantage of the opportunity and advocated that the Control Commission for Germany (British Element) (CCG/BE) revive Hanoverian statehood, reconstituting the Prussian Province of Hanover as the State of Hanover. The state saw itself in the tradition of the kingdom. Its prime minister, Hinrich Wilhelm Kopf, played a central role when the state of Lower Saxony was founded just a few months later by merging Hanover with several smaller states, with the city of Hanover as its capital. The former territory of Hanover makes up 85 per cent of Lower Saxony and is the origin of its coat of arms.
Sources: en.wikipedia.org
No. Cardarine is a PPARδ agonist, while selective androgen receptor modulators act on androgen receptors. The two classes differ in receptor target and downstream effects.
Preclinical rodent studies reported cancers, including liver and bladder tumors, at tested doses. The human relevance of those findings is uncertain, but development was discontinued. No approved human product resulted.
No. It remains an investigational compound without approved therapeutic labeling. Sports regulators prohibit its use, and health agencies have warned against consuming it.
Legal status varies by country, but cardarine is not approved as a medicine in major jurisdictions. It is often sold as a research chemical, a category that may not be lawful for human use. Buyers should check local laws and product labels carefully.