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 2026-06-10. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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.
Cardarine can be detected in biological samples and product materials using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The method separates compounds by chromatography and identifies them by mass-to-charge transitions, allowing low-level detection in urine or blood. Sample preparation often involves enzymatic hydrolysis, solid-phase extraction, or protein precipitation. Certified reference materials and isotope-labeled internal standards improve quantification. Detection windows depend on metabolism, matrix, and assay sensitivity, so no single universal window applies.
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.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516; GW-1516; endurobol | GW501516 is the research code |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator |
| Molecular formula | C21H18F3NO3S2 | Established chemical formula |
| Molar mass | 453.5 g/mol | Calculated from the formula |
| Regulatory status | Prohibited in sport; not approved as medicine | Status varies by country |
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.
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.
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.
Stability of GW501516 depends on form, temperature, light exposure, and moisture. Solid reference material is typically stored frozen or refrigerated in a desiccator and protected from light. Solutions in organic solvents such as dimethyl sulfoxide are often kept frozen in aliquots to reduce freeze-thaw cycling. Aqueous solubility is low, so aqueous stock solutions can be difficult to prepare without cosolvents. Degradation may appear as changes in chromatographic purity or mass spectral signal. Stability studies are needed to establish shelf life for any specific preparation.
A study on the relationship between morphology and ecology of extant and extinct members of Feliformia is published by Barrett & Hopkins (2026), who identify three adaptive zones within the studied group, and find that hypercarnivorous feliforms, unlike members of the group with broader diets, can be reliably identified on the basis of the study of their dental morphology. Kargopoulos et al. (2026) revise the composition of the ictitheriine hyaenid assemblage from the Miocene strata from the Venta del Moro (Spain), reporting possible evidence of presence of a second species in addition to Hyaenictitherium wongii. Kargopoulos et al. (2026) identify bite punctures in skulls of Adcrocuta eximia from the Miocene strata from the Torrentet dels Traginers site and Chasmaporthetes lunensis from the Pleistocene strata from the La Puebla de Valverde site (Spain), interpreted as possible evidence of intraspecific aggression. A study on Pliocene coprolites from the Odesa catacombs (Ukraine), providing evidence of extensive bone and hair consumption by members of the genus Pliocrocuta interpreted as indicative of scavenging as primary feeding strategy, is published by Brachaniec et al. (2026). Evidence of morphological changes in the skull of Pachycrocuta brevirostris from the Pleistocene strata from the Taurida Cave (Crimea) during its ontogeny is presented by Lavrov et al. (2026). Evidence of increased adaptation of postcanine teeth of Pachycrocuta brevirostris to hypercarnivory and bone-cracking throughout the evolutionary history of the species is presented by Khantemirov et al.
== Epidemiology == In European populations, cellulite is thought to occur in 80–90% of post-adolescent females. Its existence as a real disorder has been challenged, and the prevailing medical opinion is that it is merely the "normal condition of many women". It is rarely seen in males.
=== Training volume === Training volume is commonly defined as sets × reps × load. That is, an individual moves a certain load for some number of repetitions, rests, and repeats this for some number of sets, and the volume is the product of these numbers. For non-weightlifting exercises, the load may be replaced with intensity, the amount of work required to achieve the activity. Training volume is one of the most critical variables in the effectiveness of strength training. There is a positive relationship between volume and hypertrophy. The load or intensity is often normalized as the percentage of an individual's one-repetition maximum (1RM). Due to muscle failure, the intensity limits the maximum number of repetitions that can be carried out in one set, and is correlated with the repetition ranges chosen. Depending on the goal, different loads and repetition amounts may be appropriate:
== Etymology == The Sanskrit noun dharma (धर्म) is a derivation from the root dhṛ 'to hold, maintain, keep', and means 'what is established or firm'. The word derives from the Vedic Sanskrit n-stem dharman- with the meaning "bearer, supporter". The historical Vedic religion apparently conceived of dharma as an aspect of Ṛta.
=== Resistance === Development of bacterial resistance under therapy is a frequent occurrence and makes fosfomycin unsuitable for sustained therapy of severe infections. Mutations that inactivate the nonessential glycerophosphate transporter render bacteria resistant to fosfomycin. Still, fosfomycin can be used to treat MRSA bacteremia. Prescribing fosfomycin together with at least another active drug reduces the risk of developing bacterial resistance. Fosfomycin acts synergistically with many other antibiotics, including aminoglycosides, carbapenems, cephalosporins, daptomycin and oritavancin. Enzymes conferring resistance to fosfomycin have also been identified and are encoded both chromosomally and on plasmids. Three related fosfomycin resistance enzymes (named FosA, FosB, and FosX) are members of the glyoxalase superfamily. These enzymes function by nucleophilic attack on carbon 1 of fosfomycin, which opens the epoxide ring and renders the drug ineffective. The enzymes differ by the identity of the nucleophile used in the reaction: glutathione for FosA, bacillithiol for FosB, and water for FosX. In general, FosA and FosX enzymes are produced by Gram-negative bacteria, whereas FosB is produced by Gram-positive bacteria. FosC uses ATP and adds a phosphate group to fosfomycin, thus altering its properties and making the drug ineffective.
Sources: en.wikipedia.org
=== Amino acid propensities === Large aromatic residues (tyrosine, phenylalanine, tryptophan) and β-branched amino acids (threonine, valine, isoleucine) are favored to be found in β-strands in the middle of β-sheets. Different types of residues (such as proline) are likely to be found in the edge strands in β-sheets, presumably to avoid the "edge-to-edge" association between proteins that might lead to aggregation and amyloid formation.
At Nagapatnam, Pulicat, and elsewhere, the company purchased 8,000–10,000 slaves, the bulk of whom were sent to Ceylon, while a small portion were exported to Batavia and Malacca. Finally, following a long drought in Madurai and southern Coromandel, in 1673, which intensified the prolonged Madurai-Maratha struggle over Tanjavur and punitive fiscal practices, thousands of people from Tanjavur, mostly children, were sold into slavery and exported by Asian traders from Nagapattinam to Aceh, Johor, and other slave markets. In September 1687, 665 slaves were exported by the English from Fort St. George, Madras. And, in 1694–96, when warfare once more ravaged South India, a total of 3,859 slaves were imported from Coromandel by private individuals into Ceylon. The volume of the total Dutch Indian Ocean slave trade has been estimated to be about 15–30% of the Atlantic slave trade, slightly smaller than the trans-Saharan slave trade, and one-and-a-half to three times the size of the Swahili and Red Sea coast and the Dutch West India Company slave trades. According to Sir Henry Bartle Frere (who sat on the Viceroy's Council), there were an estimated 8 or 9 million slaves in India in 1841. About 15% of the population of Malabar were slaves. Slavery was legally abolished in the possessions of the East India Company by the Indian Slavery Act, 1843.
== Carbon dioxide emissions == The BP Statistical Review of World Energy 2019 ranked Thailand the second highest CO2 emitter in ASEAN in 2018, estimating its emissions at 302 million tonnes. The other five largest ASEAN economies generated: Indonesia, 543 Mt; Malaysia, 250 Mt; Singapore, 230 Mt; Vietnam, 225 Mt; and Philippines, 134 Mt. In 1965, Thailand's CO2 emissions were 7.4 Mt. Global Carbon Project: In the Global Carbon Atlas 2014, of 216 nation states/territories, Thailand ranked 18 (1=most emissions, 216=fewest emissions) in CO2 emissions, up from 19 in 2013.
Photograph 1. – Open rhinoplasty: The incisions are endonasal (in the nose), and thus are hidden. The skin-incision to the columella aids the plastic surgeon in precisely suturing to hide the scar—except for the columellar incision (red-dot guideline) across the nasal base. The columellar incision allows the surgeon to view the size, shape, and condition of the nasal cartilages and bones to be corrected. Photograph 2. – Open rhinoplasty: The nasal interior. The scissors indicate the lower lateral cartilage (blue), which is one of the wing-shaped cartilages that conform the tip of the nose. The jagged red delineation indicates the locale of the columellar incision. Once the skin has been lifted from the bone-and-cartilage framework, the surgeon performs the nasal correction tasks. Photograph 3. – Open rhinoplasty: To narrow the tip of a too-wide nose, the surgeon first determines the cause of the excess nasal width. The suture being emplaced will narrow the tip of the nose. The red delineation indicates the edge of the nose-tip cartilage, which is narrowed when the surgeon tightens the folded cartilage apex. The suture (light blue) ends in the needle (white); tweezers (green) hold the nasal cartilage in place for the suturing. Photograph 4. – Nasal hump excision: The black delineation indicates the desired nose-reduction outcome: a straight nose. The nasal hump is bone (red) above the scalloped grey line, and cartilage (blue) below the scalloped grey line.
=== Redox indicator === Methylene blue is widely used as a redox indicator in analytical chemistry. Solutions of this substance are blue when in an oxidizing environment, but will turn colorless if exposed to a reducing agent.
Sources: en.wikipedia.org
Somalia evolved into a major world supplier of uranium, with American, UAE, Italian and Brazilian mineral companies vying for extraction rights. Link Natural Resources has a stake in the central region, and Kilimanjaro Capital has a stake in the 1,161,400 acres (470,002 ha) Amsas-Coriole-Afgoi (ACA) Block, which includes uranium exploration. The Trans-National Industrial Electricity and Gas Company is an energy conglomerate based in Mogadishu. It unites five major Somali companies from the trade, finance, security and telecommunications sectors, following a 2010 joint agreement signed in Istanbul to provide electricity and gas infrastructure in Somalia. With an initial investment budget of $1 billion, the company launched a labour-intensive energy program aimed at facilitating local industrialisation initiatives. According to the Central Bank of Somalia, as the nation embarks on the path of reconstruction, the economy is expected not only to match its pre-civil war levels, but also to accelerate in growth and development due to Somalia's untapped natural resources.
Tequila (; Spanish: [teˈkila] ) is a distilled beverage made from the blue agave plant, primarily in the area surrounding the town of Tequila 65 km (40 mi) northwest of Guadalajara, and in the Jaliscan Highlands (Los Altos de Jalisco) of the central western Mexican state of Jalisco. The red volcanic soils in the region of Tequila are well suited for growing the blue agave, and more than 300 million plants are harvested there each year. Agave grows differently depending on the region. Blue agaves grown in the highland Los Altos region are larger and sweeter in aroma and taste. Agaves harvested in the valley region have a more herbaceous fragrance and flavor. Due to its historical and cultural importance, the region near Tequila was declared a UNESCO World Heritage Site in 2006, the Agave Landscape and Ancient Industrial Facilities of Tequila. Tequila differs from mezcal—other distilled spirits from the agave plant—because it is made only from blue agave. By Mexican law, no beverage may be sold as tequila unless it contains between 35% and 55% alcohol content (70 and 110 U.S. proof) and is produced in the state of Jalisco and limited municipalities in the states of Guanajuato, Michoacán, Nayarit, and Tamaulipas. International agreements also prevent the sale of "tequila" produced outside Mexico. The drink is recognized as a Mexican designation of origin product in more than 40 countries.
=== Imaging === Magnetic resonance imaging of muscle can assess deep muscles not readily sampled by EMG, identify subclinical involvement, characterise patterns of muscle edema and fatty replacement, and guide the selection of a biopsy site.
On 3 January 2024, UNICEF chief Catherine M. Russell stated many children in Gaza were facing severe acute malnutrition. On 5 January, UNICEF found 90 percent of children under the age of two were eating two or fewer food groups a day. On 3 February, Hani Mahmoud, an Al Jazeera journalist in Rafah, stated, "We’re seeing children roaming around in Rafah looking for scraps of food." In early January 2024 UNICEF reported that around 90% of children in Gaza under 2 were subjected to severe food poverty, which had jumped from 80% about two weeks prior. Price jumps have also been seen by those attempting to purchase food, with a caregiver purchasing through a procurement company infant formula which had cost him $1,680 before the war, but paying $2,160 in February 2024. The United Nations stated on 10 February 2024 that 10 percent of children under five-years-old were suffering from acute malnourishment. One mother reported feeding her newborn using date paste. On 19 February 2024, UNICEF found that nearly 16 percent of children in northern Gaza under two-years-old were "acutely malnourished", with 3 percent suffering from severe wasting. In early March 2024 UNICEF reported that over 90% of children aged 6–23 months and pregnant or breastfeeding women face severe food poverty with access to two or fewer food groups a day. Child malnutrition is varied throughout Gaza, with northern Gaza experiencing worse food shortages then southern Gaza leading to a child malnutrition rate three times higher according to the WHO.
25% of patients treated with arsenic trioxide exhibited symptoms resembling leukocyte activation syndrome, characterized by high fever, shortness of breath, weight gain, pulmonary infiltrates with pleural or pericardial exudation, with or without leukocytosis. High doses of steroids (10 mg dexamethasone intravenously, 2–3 times per day) appear to alleviate these symptoms. 40% of patients treated with arsenic trioxide experienced at least one instance of prolonged QT interval, corrected to over 500 ms. QT interval prolongation can lead to ventricular arrhythmias, such as torsades de pointes. Prior to initiating arsenic trioxide treatment, an ECG should be performed, and blood levels of potassium, calcium, magnesium, and creatinine should be checked. Any abnormalities, particularly a prolonged QT interval on the ECG, should be corrected before starting arsenic trioxide. Any medications that may prolong the QT interval should be discontinued if possible. Patients receiving arsenic trioxide, particularly those at risk for torsades de pointes, should be closely monitored during treatment. If toxicity reaches level 3 (as per National Cancer Institute criteria), treatment should be modified or discontinued before the planned completion of therapy. Patients can resume treatment only after symptoms subside, starting with 50% of the prior daily dose. The dose can be increased to the previous level if no toxicity symptoms appear within 3 days. If toxicity reappears, treatment with arsenic trioxide cannot continue.
Sources: en.wikipedia.org
No. Cardarine is GW501516, a PPARδ agonist, while SARMs act on androgen receptors. The two classes are often grouped in informal discussions despite different mechanisms.
No. It has no approved medical indication in any country. Regulatory agencies have not cleared it for treatment or prevention of any condition.
Early clinical work stopped after rodent carcinogenicity findings. Those animal results raised concerns about long-term human risk, although direct human evidence is lacking. The human relevance of the tumors remains an open scientific question.
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.