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 2026-05-05. 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.
Cardarine is explicitly prohibited by the World Anti-Doping Agency under the class of PPARδ agonists. Its presence in urine or blood samples can be detected using mass spectrometry-based methods, often liquid chromatography-tandem mass spectrometry. Athletes who test positive may face sanctions, including bans from competition. The compound is also regulated as a prescription-only or unapproved drug in many countries. Enforcement varies by jurisdiction, and some regions treat it as a controlled substance. Online sales may occur despite these restrictions, creating quality and legal risks.
Laboratory detection of cardarine typically involves sample preparation followed by chromatographic separation and mass spectrometric identification. Urine is the most common matrix for anti-doping tests, though blood and hair have also been explored. Methods can target the parent compound or its metabolites, depending on the expected window of detection. Reference standards are required for accurate quantification. Matrix effects and dilution can influence results, so laboratories use internal standards and validation protocols. The exact detection window varies with dose, route, and individual metabolism.
| 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 |
Activation of PPARδ changes transcription of genes involved in fatty acid transport, mitochondrial function, and skeletal muscle fuel preference. In rodent studies, pharmacological PPARδ activation was associated with increased endurance and altered body composition. These findings generated interest in performance enhancement, but species differences and study designs limit direct extrapolation to humans. Small human trials were conducted in the 2000s and later discontinued. The extent to which cardarine produces similar metabolic or performance effects in people remains an open question.
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.
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.
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.
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.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
Throughout the times, there have been a variety of architectural styles, from those of indigenous peoples to contemporary ones, passing through colonial (military and religious), Republican, transition and modern styles.
9 October – 2024 Conservative Party leadership election: James Cleverly is knocked out of the leadership race, leaving Kemi Badenoch and Robert Jenrick to through to the final round, with the new leader chosen in a ballot of party members. Leena Sarah Farhat, a member of Llanfairfechan Town Council, is suspended by the Liberal Democrats after sharing a social media post that appeared to celebrate the 7 October attacks. 10 October – Starmer holds talks with Ukraine president Volodymyr Zelensky in Downing Street as Zelensky seeks ongoing support for the war against Russia. Starmer chairs the inaugural meeting of the Council of the Nations and Regions in Edinburgh, bringing together the leaders of the UK's devolved nations and regional mayors. Steve Davies, a former councillor with Ceredigion County Council and Aberystwyth Town Council, is disqualified from holding public office for three years after sending unwanted love letters and gifts to a number of women. 11 October – At the Plaid Cymru Annual Conference, the party's four Westminster MPs back a motion calling for a sporting and economic boycott of Israel over the war in Gaza. 12 October – Plaid Cymru votes to adopt the motion calling for a sporting and economic boycott of Israel. 13 October – Flags are lowered to half-mast at the Scottish Parliament following the death of former First Minister Alex Salmond the previous day. MSP John Mason is expelled from the SNP after posting on Twitter that there was "no genocide" in Gaza.
Spent nuclear fuel from normal light water reactors contains plutonium, but it is a mixture of plutonium-242, 240, 239 and 238. The mixture is not sufficiently enriched for efficient nuclear weapons, but can be used once as MOX fuel. Accidental neutron capture causes the amount of plutonium-242 and 240 to grow each time the plutonium is irradiated in a reactor with low-speed "thermal" neutrons, so that after the second cycle, the plutonium can only be consumed by fast neutron reactors. If fast neutron reactors are not available (the normal case), excess plutonium is usually discarded, and forms one of the longest-lived components of nuclear waste. The desire to consume this plutonium and other transuranic fuels and reduce the radiotoxicity of the waste is the usual reason nuclear engineers give to make fast neutron reactors. The most common chemical process, PUREX (Plutonium–URanium EXtraction), reprocesses spent nuclear fuel to extract plutonium and uranium which can be used to form a mixed oxide (MOX) fuel for reuse in nuclear reactors. Weapons-grade plutonium can be added to the fuel mix. MOX fuel is used in light water reactors and consists of 60 kg of plutonium per tonne of fuel; after four years, three-quarters of the plutonium is burned (turned into other elements). MOX fuel has been in use since the 1980s, and is widely used in Europe. Breeder reactors are specifically designed to create more fissionable material than they consume. MOX fuel improves total burnup.
Sources: en.wikipedia.org
== Medical applications == Vitamin E has been suggested as a supplement for helping many health conditions, mostly due to its antioxidant activity and potential to protect cells from oxidative damage. In the US, the vitamin is widely available as an over-the-counter supplement; however, medical evidence supporting its effectiveness and safety for treating or preventing a variety of health conditions is mixed. Vitamin E can also interact with some medications and other supplements. Vitamin E has been studied as a treatment for skin health and skin ageing, immune function, and managing conditions like cardiovascular disease or Alzheimer's disease (AD), or certain types of cancer. Most studies have found limited or inconclusive benefits and the potential for some risks. It is most often recommended to obtain vitamin E through a balanced diet because high-dose supplementation may have health risks. There is evidence that the sale of dietary supplement vitamin E has decreased by up to 33% following a report showing little or no effect of vitamin E in preventing cancer or cardiovascular disease. In 2023, it was the 290th most commonly prescribed medication in the United States, with more than 500,000 prescriptions.
Jaquelyn Patricia Longworth, Operational Safety and Policy Manager, Nuclear Electric Ltd. For services to Engineering Management. Walter Herbert Love. For services to Radio Journalism. Maurice Ernest Lowe, Engineering Manager, Vosper Thornycroft (UK) Ltd. For services to the Defence Industry. William Lowe. For services to the Library Service. June Valerie Lucas. For services to the community in Stanford Rivers, Essex. Brenda Germaine Lynn, Sub Divisional Officer, Special Constabulary, West Yorkshire Police. For services to the Police. Monica Lynskey, lately Administrative Officer, Office for Standards in Education. James Archibald MacDonald, Head Greenkeeper, Royal Lytham & St Annes Golf Club. For services to Golf. Thomas MacDougall, Retained Sub-Officer, Tayside Fire Brigade. For services to the Fire Service. Williamina MacGregor, School Cook, Lochardil Primary School, Inverness. For services to Education. Jean Macinnes. For services to the Citizens' Advice Bureau in Aberdeen. Laurence Macintyre, Chief Superintendent, Strathclyde Police. For services to the Police. John Kenneth MacKay, Crofter. For services to the community in Sutherlandshire. John Watson Mackay, Head of Recreation and Access Branch, Research and Advisory Services, Directorate, Scottish Natural Heritage. For services to Countryside Recreation. Florence King MacKenzie, Director, Scottish Churches Architectural Heritage Trust. For services to the Restoration of Church Buildings. George MacLean, lately Manager, Air Traffic Service, Sumburgh Airport (Shetland), Civil Aviation Authority.
Gynecomastia induced by spironolactone usually regresses after a few weeks following discontinuation of the medication. However, after a sufficient duration of gynecomastia being present (e.g., one year), hyalinization and fibrosis of the tissue occurs and drug-induced gynecomastia may become irreversible.
In conjunction, the Russian Interior Ministry issued an arrest warrant for the International Criminal Court's Prosecutor Karim Ahmad Khan, who was responsible for issuing Putin's arrest warrant in March 2023, while the Prosecutor-General of Russia deemed the environmental organization Greenpeace an "undesirable organization", calling it "a threat to the foundations of the constitutional order and security" of the country for interfering in the "internal affairs of the state" and spreading "anti-Russian propaganda" and calling for economic sanctions. The order prompted Greenpeace to halt its operations in Russia. Yevgeny Roizman, former mayor of Yekaterinburg and opposition politician, was convicted and fined 260,000 rubles ($3245) for discrediting the Russian army over comments made regarding the war in Ukraine. Ukraine was losing some 10,000 drones a month due to Russian electronic warfare according to report by the Royal United Services Institute.
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.
Yes, WADA prohibits cardarine as a PPARδ agonist. It appears on the prohibited list and can be detected in urine or blood. Athletes using it risk sanctions.