A practical reference on Reference standard: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-01-18. Anything still debated is marked as such rather than presented as settled.
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 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 |
|---|---|---|
| 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 |
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.
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.
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.
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 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.
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.
== History == In the 1940s Craig invented the first apparatus to conduct countercurrent partitioning; he called this the countercurrent distribution Craig apparatus. The apparatus consists of a series of glass tubes that are designed and arranged such that the lighter liquid phase is transferred from one tube to the next. The next major milestone was droplet countercurrent chromatography (DCCC). It uses only gravity to move the mobile phase through the stationary phase which is held in long vertical tubes connected in series. The modern era of CCC began with the development of the planetary centrifuge by Ito which was first introduced in 1966 as a closed helical tube which was rotated on a "planetary" axis as is turned on a "sun" axis. Centrifugal partition chromatography was introduced in Japan in 1982; the first instrument was built at Sanki Eng. Ltd. in Kyoto. The first instrument consisted of twelve cartridges arranged around the rotor of a centrifuge; the inner volume of each cartridge was about 15 mL for 50 channels. In 1999 Kromaton developed the first FCPC with radial cells. During cell development, the Z cell was completed in 2005 and the twin cell in 2009. In 2017 RotaChrom designed its top performing CPC cells through computed fluid dynamic simulation software by László Németh and László Lorántfy. After thousands of simulations, this tool revealed the drawbacks of conventional CPC cell designs and highlighted the unparallel load capacity and scalable cell design of RotaChrom. Both researchers left RotaChrom in Sept 1 2019.
intervention is complex and requires careful consideration. International law remains the guiding framework. At this stage, political instability in Venezuela must be avoided. The objective is an orderly transition to an elected government." Holy See: Pope Leo XIV expressed concern over the US attack on Venezuela and the arrest of Maduro. He stated "The good of the beloved Venezuelan people must prevail over every other consideration and lead us to overcome violence and to undertake paths of justice and peace ..." at the midday Angelus prayer. Pope Leo invited everyone to pray for the people of Venezuela in St. Peter's Square. Hungary: Prime Minister Viktor Orbán welcomed the capture of Maduro as "good news" for Hungary, stating that it will bring down oil prices, and brushed aside legality concerns. He also stated that no Hungarian citizen was harmed in Venezuela, and that the Hungarian government was working to protect Hungarians in the region. He stated the government was working with the energy sector to prevent price increases stemming from the crisis. Iceland: Foreign Minister Þorgerður Katrín Gunnarsdóttir condemned the strikes, stating that "we can and must stand against authoritarianism and human rights abuses at the same time". Ireland: Minister for Foreign Affairs and Trade Helen McEntee said in a statement that she was in close contact with EU High Representative Kaja Kallas, and Ireland underlines the absolute necessity of full respect for international law and the principles of the UN Charter. Italy: Prime Minister Giorgia Meloni defended the U.S.
American cockroaches generally live in moist areas but can survive in dry areas if they have access to water. They prefer high temperatures around 29 °C (84 °F) and do not tolerate low temperatures. These cockroaches are common in basements, crawl spaces, cracks and crevices of porches, foundations, and walkways adjacent to buildings. In residential areas outside the tropics, these cockroaches live in basements and sewers and may move outdoors into yards during warm weather. Adult American cockroaches were not able to survive several days at ≤10°C. Under constant temperatures of 8, 9, and 10°C, approximately 40% of cockroaches died within 72 hours.
Sources: en.wikipedia.org
== Uses == In Indonesia, Strobilanthes alternata is used to promote urination, check and heal hemorrhages, stop dysentery, and treat venereal diseases. The plant is popular in the United States and rarely the United Kingdom to use in hanging baskets for gardens.The botanical name of Red flame ivy is Hemigraphis colorata Blume.
Nicotinamide mononucleotide adenylyltransferase 2 (NMNAT2) is an enzyme that in humans is encoded by the NMNAT2 gene. This gene product belongs to the nicotinamide-nucleotide adenylyltransferase (NMNAT) enzyme family, members of which catalyze an essential step in the nicotinamide adenine dinucleotide (NAD+ (NADP)) biosynthetic pathway. NMNAT2 is cytoplasmic (associated with the Golgi apparatus), and is predominantly expressed in the brain. Two transcript variants encoding different isoforms have been found for this gene.
The main minority ethnic groups of the former Commonwealth, including Ukrainians, Lithuanians, Belarusians and Jews, were getting involved in their own national movements and plans, which met with disapproval on the part of those Polish independence activists who counted on an eventual rebirth of the Commonwealth or the rise of a Commonwealth-inspired federal structure (a political movement referred to as Prometheism). Around the start of the 20th century, the Young Poland cultural movement, centered in Austrian Galicia, took advantage of a milieu conducive to liberal expression in that region and was the source of Poland's finest artistic and literary productions. In this same era, Marie Skłodowska Curie, a pioneer radiation scientist, performed her groundbreaking research in Paris.
If the bottle of tequila does not state on the label that it is manufactured from 100% blue agave (no sugars added), then, by default, that tequila is a mixto (manufactured from at least 51% blue agave). Some tequila distilleries label their tequila as "made with blue agave" or "made from blue agave". The Tequila Regulatory Council has stated only tequilas distilled with 100% agave can be designated as "100% agave". Many of the higher-quality, 100% agave tequilas do not impart significant alcohol burn, and drinking them with salt and lime is likely to remove much of the flavor. These tequilas are usually sipped from a snifter glass rather than a shot glass, and savoured instead of quickly gulped. Doing so allows the taster to detect subtler fragrances and flavors that would otherwise be missed.
Sources: en.wikipedia.org
After the US revoked his existing B1/B2 visa in 2005 and refused to accept his application for an A2 visa, the US State Department affirmed that the visa policy remained unchanged : "(Mr Modi) is welcome to apply for a visa and await a review like any other applicant". Exploring opportunities on how to move the relationship out of a state of morose, Lisa Curtis, senior research fellow for South Asia in the Asian Studies Center of The Heritage Foundation, says that, "the U.S. must first signal its willingness and commitment to collaborating with the new government—and that it will not dwell on the controversy of the 2002 Gujarat riots, which led the U.S. to revoke Modi's visa in 2005." In 2009, the U.S. Commission for International Religious Freedom (USCIRF) report after ignoring the views and decision of independent body (SIT) set up by India's highest judiciary vehemently alleged that there was "significant evidence" linking Narendra Modi to communal riots in the state in 2002 and asked the Obama administration to continue the policy of preventing him from travelling to the United States of America . The Obama administration maintained the 2005 decision taken by the George W. Bush administration to deny Narendra Modi entry into the United States of America. The US Government says that Modi can circumvent the USCIRF sanctions regime by visiting Washington on a Heads of government A1-visa as long as he is the Prime Minister of India.
=== Books === Boitano, Scott; Brooks, Heddwen L.; Barman, Susan M.; Barrett, Kim E. (2016). Ganong's Review of Medical Physiology. McGraw-Hill Education. ISBN 978-0-07-182510-8. Susan Standring, ed. (2008). Gray's anatomy: the anatomical basis of clinical practice (40th ed.). London: Churchill Livingstone. ISBN 978-0-8089-2371-8. Cole, Laurence A.; Kramer, Peter R. (2016). Human Physiology, Biochemistry and Basic Medicine. Amsterdam: Academic Press. ISBN 978-0-12-803699-0.
=== Aviptadil/phentolamine combination for Erectile Dysfunction (ED) === October 2000 UK (Invicorp): aviptadil, in combination with the adrenergic drug phentolamine, is approved as an effective alternative therapy for erectile dysfunction (ED) patients. One dose intracavernosal injection contains 25 micrograms aviptadil and 2 mg of phentolamine mesilate for the treatment of ED. Aviptadil dose used for treatment of erectile dysfunction is a lot smaller than that for the treatment of ARDS.
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.
No. Cardarine has not received approval for human therapeutic use in major jurisdictions. It remains an investigational compound.