If you have been reading about LC-MS/MS 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 2025-11-16. Numbers and descriptions here follow the published literature rather than marketing material.
Regulatory treatment of cardarine differs by context and jurisdiction. In competitive sport, the World Anti-Doping Agency lists PPARδ agonists, including GW501516, as prohibited at all times. Outside sport, it lacks approval as a prescription medicine in major drug markets, and products sold for human consumption may be treated as unapproved drugs. Some countries also restrict importation or sale through general consumer protection and medicines laws. These classifications affect availability, testing, and legal risk without establishing therapeutic value.
Because cardarine is not an approved medicine, no pharmacopeial monograph defines its identity, purity, or storage requirements. Laboratories typically rely on in-house methods and reference standards when testing materials labeled as GW501516. Certificates of analysis may report purity and identity for a specific batch, but their scope varies and they do not guarantee safety or legal status. Independent verification can include high-performance liquid chromatography, mass spectrometry, nuclear magnetic resonance, and elemental analysis. The distinction between research chemical labeling and human use is significant because quality standards and oversight differ.
A persistent misconception is that cardarine is a fat-burning drug or a safe alternative to anabolic steroids. No approved therapeutic product exists, and human safety data are limited. The tumor findings in rodents remain a central concern in scientific reviews. Products sold online may contain inaccurate labels, impurities, or different compounds entirely, which complicates any assessment of effects. Independent testing of such products has reported frequent mislabeling. For these reasons, discussions in the literature emphasize risks and unknowns rather than benefits.
Cardarine is not approved for human therapeutic use in any major jurisdiction. It appears on the World Anti-Doping Agency Prohibited List as a PPARδ agonist within the hormone and metabolic modulators category. Sports organizations test for it because it has been detected in athlete samples and seized products. Regulatory actions against marketed research chemical versions have occurred in several countries, though enforcement varies. Availability through unregulated channels complicates oversight.
Analytical laboratories typically identify cardarine and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is a common matrix in anti-doping testing, while blood and tissue may be used in research settings. Detection windows depend on the assay, the sample matrix, and the compound's metabolism. Because cardarine is extensively metabolized, laboratories often target specific metabolites to improve sensitivity and confirmation. Reference standards are required for reliable quantification. Method validation includes checks for selectivity, linearity, and carryover.
| Property | Value | Notes |
|---|---|---|
| WADA classification | S4 Hormone and Metabolic Modulators | Prohibited at all times in sport. |
| Drug approval status | Not approved in major jurisdictions | No accepted therapeutic indication. |
| Common detection method | LC-MS/MS | Detects parent compound and metabolites. |
| Typical test matrix | Urine or blood | Urine is common in anti-doping testing. |
| Product labeling | Research chemical or supplement | Often not independently verified. |
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.
Human trials of GW501516 were small and short in duration. They examined lipid levels, glucose handling, and other metabolic markers, but the programs were halted after the animal cancer findings. No approved therapeutic product exists, and published human data are insufficient for establishing long-term safety. Reports of use for athletic performance come mainly from non-clinical settings and cannot be verified through controlled trials. Independent testing of products sold as cardarine has found inconsistent purity and labeling.
Laboratory studies indicate that GW501516 activates PPARδ, a nuclear receptor involved in fatty acid oxidation and energy metabolism. In rodent experiments, treated animals often showed increased endurance and reduced fat mass. These effects were observed under controlled conditions and do not establish safe or effective use in humans. The exact dose-response relationship in humans remains poorly characterized. Species differences in metabolism can affect how results translate across animals and people.
Safety concerns emerged from long-term animal studies. In rodents given the compound for extended periods, researchers found an increased incidence of certain cancers, including liver and bladder tumors. These findings contributed to the discontinuation of clinical development. Whether similar risks apply to short-term or low-level exposure in humans is not established, and controlled human safety data are limited. The relevance of high-dose rodent carcinogenicity findings to human use remains a subject of debate.
==== Fat ==== Based on the findings that FNDC5 induces thermogenin expression in fat cells, overexpression of FNDC5 in the liver of mice prevents diet-induced weight gain, and FNDC5 mRNA levels are elevated in human muscle samples after exercise, it has been proposed that irisin promotes the conversion of white fat to brown fat in humans, which would make it a health-promoting hormone. While this proposal has been challenged by evidence finding FNDC5 is upregulated only in highly active elderly humans, more recent literature has supported the hypothesis of FNDC5 and irisin having a necessary role in exercise related benefits.
=== Bronze Wolf Award === WOSM's Bronze Wolf Award is given for exceptional services to the international Scout Movement. It was first awarded to Robert Baden-Powell by a unanimous decision of the committee on the day the award was instituted in 1935.
=== Sports medicine, concussion, chronic traumatic encephalopathy (CTE), and hyperbaric oxygen therapy (HBO) === Maroon served as the team neurosurgeon for the Pittsburgh Steelers for 40 years, becoming one of the longest-tenured team neurosurgeons in the NFL. Although now retired from active surgical duties, he continues to serve as a medical consultant to the Steelers. He also served as medical director for WWE from 2009 to 2023 and remains a consultant to the organization. He is a past president of the Congress of Neurological Surgeons. Together with neuropsychologist Mark Lovell, Maroon developed ImPACT (Immediate Post-Concussion Assessment and Cognitive Testing), a tool to assess the presence and severity of concussion symptoms. It has become the standard assessment for sports-related concussions, with over 25 million tests administered worldwide. Maroon is interested in the prevention and treatment of concussions, specifically in football. In 2006, he joined the National Football League's Mild Traumatic Brain Injury Committee, which, in 2007, was renamed the Head, Neck, and Spine Committee. He has been consulted as an expert by American media on this subject. Based on his research into the predictors and scope of chronic traumatic encephalopathy (CTE), he has suggested a more cautious approach to characterizing the condition as an epidemic. He claims there is reason to be skeptical of the reported widespread incidence of CTE.
=== Search and discussion === One of the central discussion forums was Reddit's /r/DarkNetMarkets/, which has been the subject of legal investigation, as well as the Tor-based discussion forum, The Hub. On March 21, 2018, Reddit administrators shut down the popular subreddit /r/DarkNetMarkets citing new changes to their content policy that forbids the sale of "Drugs, including alcohol and tobacco, or any controlled substances". This led to the rise of Dread, the dedicated darknet discussion forum and the news site Darknetlive (since closed). Some marketplaces maintain their own dedicated discussion forums and subreddits. The majority of the marketplaces are in English, but some have opened in Chinese, Russian, and Ukrainian. The dedicated market search engine Grams (closed December 2017) allowed the searching of multiple markets directly without login or registration. Dark web news and review sites such as the former DeepDotWeb, and All Things Vice provide exclusive interviews and commentary into the dynamic markets. Uptime and comparison services provide sources of information about active markets as well as suspected scams and law enforcement activity. Due to the decentralized nature of these markets, phishing and scam sites are often maliciously or accidentally referenced. After discovering the location of a market, a user must register on the site, sometimes with a referral link, after which they can browse listings. A further PIN may be required to perform transactions, better protecting users against login credential compromise.
The catalytic reaction can be conducted in a continuous flow reactor instead of a batch reactor with no remains of the catalyst in the end product. Graphene coated cobalt nanoparticles have been used for that experiment since they exhibit a higher magnetization than Ferrite nanoparticles, which is essential for a fast and clean separation via external magnetic field.
Sources: en.wikipedia.org
=== Formulations === Codeine is marketed as both a single-ingredient drug and in combination preparations with paracetamol (as co-codamol: e.g., brands Paracod, Panadeine, and the Tylenol-with-codeine series, including Tylenol 3 and 1, 2, and 4); with aspirin (as co-codaprin); or with ibuprofen (as Nurofen Plus). These combinations provide greater pain relief than either agent alone (drug synergy). Codeine is also commonly marketed in products containing codeine with other pain killers or muscle relaxers, as well as codeine mixed with phenacetin (Emprazil with codeine No. 1, 2, 3, 4, and 5), naproxen, indomethacin, diclofenac, and others, as well as more complex mixtures, including such mixtures as aspirin + paracetamol + codeine ± caffeine ± antihistamines and other agents, such as those mentioned above. Codeine-only products can be obtained with a prescription as a time-release tablet. Codeine is also marketed in cough syrups with zero to a half-dozen other active ingredients, and a linctus (e.g., Paveral) for all of the uses for which codeine is indicated. Injectable codeine is available for subcutaneous or intramuscular injection only; intravenous injection is contraindicated, as this can result in nonimmune mast-cell degranulation and resulting anaphylactoid reaction. Codeine suppositories are also marketed in some countries
Oxymorphazone is an opioid analgesic drug related to oxymorphone. Oxymorphazone is a potent and long acting μ-opioid agonist which binds irreversibly to the receptor, forming a covalent bond which prevents it from detaching once bound. This gives it an unusual pharmacological profile, and while oxymorphazone is only around half the potency of oxymorphone, with higher doses the analgesic effect becomes extremely long lasting, with a duration of up to 48 hours when administered intraventricularly. However, tolerance to analgesia develops rapidly with repeated doses, as chronically activated opioid receptors are rapidly internalised by β-arrestins, similar to the results of non-covalent binding by repeated doses of agonists with extremely high binding affinity such as lofentanil.
Various medications are approved for treating obesity with varying rates of weight loss between 3-21%, but weight regain is very common after discontinuation. Medications are recommended to be used only in combination with lifestyle changes. After stopping treatment with GLP-1 agonists such as semaglutide, liraglutide and tirzepatide, people regain on average more than half (50–70%) of the lost weight within 1 year.
==== Construction and renovation ==== In a 2022 report on workplace lead exposure trends, the US CDC notes that construction is among the top four main industries at risk for lead exposure. In Ghana, workers who paint or spray/paint have been tested with the highest prevalence of elevated blood lead levels in a study conducted on blood lead levels in high-risk occupational groups. Amongst different paint usage in Iran, a small study found that car and building painters have elevated blood lead levels, in which car painters had higher blood lead levels than building painters.
== Genetics == Human factor XIII consist of A and B subunits. A subunit gene is F13A1. It is on chromosome 6 at the position 6p24–25. It spans over 160 kbp, has 14 introns and 15 exons. Its mRNA is 3.9 kbp. It has a 5' UTR of 84 bp and a 3' UTR of 1.6 kbp. F13A1 exon(s)
Sources: en.wikipedia.org
== Interactions == There have been reports of increased liver toxicity in people with HIV/AIDS on zidovudine or efavirenz when treated with amodiaquine-containing ACT regimens, therefore it is recommended that these people avoid amodiaquine.
In 1944, Oswald Avery, working at the Rockefeller Institute of New York, demonstrated that genes are made up of DNA (see Avery–MacLeod–McCarty experiment). In 1952, Alfred Hershey and Martha Chase confirmed that the genetic material of the bacteriophage, the virus which infects bacteria, is made up of DNA (see Hershey–Chase experiment). In 1953, James Watson and Francis Crick published a paper about the discovery of the double helical structure of the DNA molecule based on the discoveries made by Rosalind Franklin. In 1961, François Jacob and Jacques Monod demonstrated that the products of certain genes regulated the expression of other genes by acting upon specific sites at the edge of those genes. They also hypothesized the existence of an intermediary between DNA and its protein products, which they called messenger RNA. Between 1961 and 1965, the relationship between the information contained in DNA and the structure of proteins was determined: there is a code, the genetic code, which creates a correspondence between the succession of nucleotides in the DNA sequence and a series of amino acids in proteins. In April 2023, scientists, based on new evidence, concluded that Rosalind Franklin was a contributor and "equal player" in the discovery process of DNA, rather than otherwise, as may have been presented subsequently after the time of the discovery. The chief discoveries of molecular biology took place in a period of only about twenty-five years.
X-ray scattering techniques are some of the most useful techniques for determining the structural identification and shape of lipids. An X-ray beam of light is applied to the lipid in which a distinct X-ray pattern is revealed. This lattice pattern is based on the electron density and localization of electrons dispersed throughout the lipid in order to determine atomic positions. The disadvantage is that it can be difficult to determine patterns in lipids that are not well oriented such as non-lamellar phases. Although this can be a limitation in producing electron density reconstructions in lipids, X-ray diffraction is still a reliable method for obtaining structural information and distinguishing between lamellar and non-lamellar phases.
Narrated by Tim Pigott-Smith, produced by Patrick Uden, directed by Sheila Hayman, made by Uden Associates 4 September The Tin Snail, about the Citroën 2CV; the 2CV was first introduced in October 1948; André Citroën saw himself as a French Henry Ford, and met American automotive industrialists in October 1931, including Henry Ford at the newly opened Ford Engineering Laboratory; the industrial historian Patrick Fridenson; Citroën lit up the Eiffel Tower in Citroën regalia, for publicity; but although André Citroën followed and admired Henry Ford, Citroën were innovative themselves, on 18 April 1934 the company launched the world's first mass-produced front-wheel drive car, the Citroën Traction Avant, when the company was narrowly avoiding bankruptcy; André Citroën died in 1935 and his company, being heavily in debt, was taken over by Édouard Michelin (brother of André Michelin); Fiat introduced its similar Fiat 500 in 1935, designed by Dante Giacosa; Ferdinand Porsche designed a new mass-produced car with rear air-cooled horizontally-opposed four-cylinder engine; France did not have such a car to Germany, so Citroën developed the Toute Petite Voiture (TPV), a proposal of Pierre Michelin - he brought in André Lefèbvre, who had designed the front-wheel-drive system of the Traction Avant and was a former aircraft engineer of Voisin, and led by Pierre-Jules Boulanger; Lefèbvre came from the aviation industry, and to save weight, made the car out of aluminium; the car had a torsion bar suspension, with eight torsion bars; Flaminio Bertoni, an Italian, was head of exterior design at Citroën, from 1932 to 1964; Carl Olsen, head of Citroën exterior design from 1982 to 1987; Alex Moulton, the Cambridge-educated mechanical engineer, who designed the suspension for the innovative Mini, in the late 1950s; Lucien Gerard, from Talbot, and Walter Becchia, who designed the two-cylinder water-cooled horizontally opposed engine. Narrated by Peter Jones, produced by Patrick Uden, directed by Jeremy Llewellyn-Jones, made by Uden Associates 11 September Deep Trouble, about the North Sea oil industry; the beginning of 1986 saw peak production of North Sea oil; finding new oil reserves would be from deeper oil fields, that cost more money to extract; at the same time the oil price plummeted, with over 15,000 job losses in the British oil industry by the end of 1986; Vickers Ltd entered the oil exploration industry; submersible craft were helping exploration of oil, with remotely operated craft becoming important. Narrated by Martin Jarvis, produced by Patrick Uden, directed by Paul Fabricius, made by Uden Associates 18 September What They Don't Tell You When They Sell You a Computer, about professionalism in the computer hardware industry; Eddy Shah from the Today newspaper, and their new unreliable computer system; Brian Wilson of First Computer believed that the computer hardware retailing industry were largely unprofessional unscrupulous cowboys; the National Computing Centre (NCC) was set up by the government in 1966, to provide advice; BP opened its own Microshop, to circumvent the cowboys, and assist with technical jargon, and connecting devices; due to warp-drive technical obsolescence in the 1980s, yesterday's computers rapidly lost all total value; Iain Callaghan, operations director of John Menzies newspaper distribution business, and how computer databases could process newsagents' daily orders much quicker and reliably; Geoff Dalby, head of data at Woolwich Equitable Building Society, which had called off a merger with the Nationwide Building Society, as their computer systems would not work together; greater computer automation of the personal finance industry could lead to much less day-to-day contact with individual customers; David Bailey of Phillips & Drew. Narrated by Miriam Margolyes, produced by Michael Blakstad, directed by Catherine Robins, made by Workhouse Productions 25 September Precisely in Profit, about manufacturing to exact margins. Produced by Glyn Jones, directed by Eben Wilson, made by Quanta 2 October Now Eat This, about snack foods. Produced by Edward Poulter, directed by Mike Tomlinson, made by London Scientific Films 9 October Growing up with Rockets, a personal, and underreported, view of early elementary rocketry from 1950, starting with captured German V-2 rockets; the former 1970 class of Cocoa Beach High School; failed launches would land in the Banana River; NASA was formed in July 1958, in a coherent response to the Russian launches in 1957; the President visits Cocoa Beach to celebrate the US getting a man to orbit the Earth in February 1962; the nearby Patrick Air Force Base; Syncom 3 was launched on 19 August 1964, the world's first geostationary communication satellite, on a Delta rocket; the minutes leading up to the first launch of STS-1 in April 1981. Directed and a first hand account of Nancy Yasecko, produced by Patrick Uden, made by Uden Associates 16 October Shock Trauma, about the Baltimore Shock Trauma Center (R Adams Cowley Shock Trauma Center). A Canadian production, produced by Patrick Uden, made by National Film Board of Canada and Uden Associates 23 October Drink Drive and Murder; it featured two court cases in the US, where a 33 year old killed a couple in their 20s, and a 17 year old who killed a couple of teenagers, and a Californian drink-drive reform centre; in some US states, if you kill when drunk, the charge is murder. A Canadian production, made by Uden Associates and the National Film Board of Canada 30 October The New Magicians, about film special effects; Gertie the Dinosaur in 1914 and The Sinking of the Lusitania in 1918; the King Kong (1933 film); the 1950s and 1960s saw modest increases in special effects, notably Forbidden Planet in 1956, until 2001: A Space Odyssey was important in 1968; another important film was Star Wars (film) in 1977, along with Close Encounters of the Third Kind, Tron in 1982 and The Last Starfighter in 1984. A Canadian production, produced by Ken McKay, made by TV Ontario 6 November Pioneers of the Future, about the development of microchips, such as Steve Dorsey, who invented the word processor. A Canadian production, produced by Ken McKay, made by Uden Associates and TV Ontario 13 November Skyscraper, about Old Madison Square Gardens and skyscrapers in Chicago and New York; Arthur Nusbaum; architect Stanley Tigerman; the tallest masonry-only building was 16 storeys high; the Great Chicago Fire in October 1871, which allowed different, and stronger, structures of building to be built instead; the 1902 Flatiron Building; architect Jack Hartray; mechanical engineer George Strakosch; the 1908 600-feet Singer Building; the 1912 800-feet Woolworth Building; the 1915 Equitable Building (Manhattan); the 1930 900-feet Chrysler Building; the 1931 1250-feet Empire State Building; mechanical engineer David Stillman; structural engineer Charles Thornton; architect Robert Sobel; structural engineer Leslie E. Robertson; civil engineer Alan Garnett Davenport of the University of Western Ontario; architect Bruce Graham; architect Harry Weese; architect Moshe Safdie. Narrated by William Woollard, produced by Nicola Glucksmann, directed by Karl Sabbagh, made by InCA
==== Protease-specific Arrays ==== A protease specific protein array based on immobilized antibodies designed to capture specific proteases from biological samples offers a step up in analysis of protein levels beyond transcript expression. Capture antibodies spotted to nitrocellulose membranes can bind proteases in complex mixtures which have been pre-incubated and bound by detection antibodies allowing for parallel analysis of relative protease levels. These arrays offer parallelization of protein levels over traditional western blot. Unfortunately, these assays fail to provide insight on enzymatic function for proteases and suffer similar drawbacks to western blots regarding reliable quantification.
Sources: en.wikipedia.org
Anti-doping laboratories typically use LC-MS/MS to detect GW501516 and its metabolites in urine. The method is sensitive and can identify the compound at low concentrations. Detection depends on sample timing, metabolism, and the specific assay.
Legality varies by country and context. It lacks marketing approval as a medicine in major countries. Sports organizations prohibit its use at all times.
A certificate of analysis may report identity, purity, and testing methods for a specific batch. It does not guarantee safety or legal status. Independent verification can confirm whether the material matches the label.
No. Cardarine has not received approval for human therapeutic use in major jurisdictions. It remains an investigational compound.