The short version of LC-MS/MS fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-10-20 and is reviewed periodically as new material appears.
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 prohibited in competitive sport under the World Anti-Doping Agency code, where it is classified as a metabolic modulator. It is not approved as a prescription medicine in the United States, European Union, or other major markets. Regulatory action has focused on its presence in sports and in products marketed as research chemicals. Because it has no accepted medical indication, supply is often unregulated. This status creates legal and safety uncertainties for anyone who encounters the substance.
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 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 |
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.
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
Detection of GW501516 in biological samples generally relies on liquid chromatography coupled with tandem mass spectrometry. Urine is a common matrix in anti-doping analysis, while blood or plasma may be used in research settings. Sample preparation can involve enzymatic hydrolysis, protein precipitation, or solid-phase extraction before instrumental analysis. Because the compound undergoes metabolism, assays may target the parent molecule, one or more metabolites, or both. Detection windows are not fixed; they depend on factors such as dose, route, individual metabolism, and assay sensitivity. Reference standards are required for accurate identification and quantification.
Handling and quality assessment of cardarine reference material follow general laboratory practices for poorly characterized compounds. It typically appears as a white to off-white powder and is sparingly soluble in water but soluble in organic solvents such as dimethyl sulfoxide and ethanol. Storage recommendations usually specify a cool, dry, dark place, with long-term storage at low temperature and desiccation. Purity may be checked by high-performance liquid chromatography with ultraviolet detection, while identity is confirmed by mass spectrometry and nuclear magnetic resonance. No pharmacopeial monograph exists, so reported purity and stability depend on the supplier’s methods.
The merger was prohibited by the European Commission on the grounds that both Tetra Pak and Sidel were market leaders in their fields and operated in related business areas. The European Court of Justice eventually ruled in favour for Tetra Laval in a high-profile case. The Tetra Laval Group is controlled by the holding company Tetra Laval International, whose board of directors include the three children of Gad Rausing. In 2014, Tetra Pak acquired Miteco, a provider of production solutions for soft drinks, fruit juices and liquid food, which employs 70 people across sites in Switzerland, Italy, the UK and South America.
==== T ==== Tarhana – is a Central Asian dried soup. Instant tea is a powdered mix in which water is added, in order to reconstitute it into a cup of tea. Tempeh – is soybeans pressed into a cake that undergoes fermentation. When dried it has a shelf life of several months. Terasi (trassi in Dutch) – Indonesian (especially Javanese cuisine) variant of dried shrimp paste usually pressed into dry blocks. It is also sometimes sold ground as a granulated powder.
Internal waters: Waters landward of the baseline, over which the state has complete sovereignty: not even innocent passage is allowed without explicit permission from said state. Lakes and rivers are considered internal waters. Territorial sea: A state's territorial sea is a belt of coastal waters extending at most 22 kilometres from the baseline of a coastal state. If this overlaps with another state's territorial sea, the border is taken as the median line between the states' baselines, unless the states in question agree otherwise. A state can also choose to claim a smaller territorial sea. The territorial sea is regarded as the sovereign territory of the state. However, foreign ships (military and civilian) are allowed innocent passage through it, or transit passage for straits; this sovereignty also extends to the airspace over and seabed below. As a result of UNCLOS, states exercise a similar degree of control over their territorial sea as over land territory. They may thus utilise coast guard and naval patrols to enforce border control measures, provided they do not prevent innocent or transit passage. Contiguous zone: A state's contiguous zone is a band of water extending farther from the outer edge of the territorial sea to up to 44 kilometres (27 miles) from the baseline, within which a state can implement limited border control measures for the purpose of preventing or punishing "infringement of its customs, fiscal, immigration or sanitary laws and regulations within its territory or territorial sea".
Sources: en.wikipedia.org
In China nearly all universities and research institutions are public. Typically, provincial governments run public universities. However, some are administered by municipal governments or are national, which the central government directly administers. Private undergraduate colleges exist but are primarily vocational colleges sponsored by private entities. Private universities can award bachelor's degrees. Public universities tend to enjoy a higher reputation domestically and globally.
=== Vertebrate hemoglobin === Vertebrates use a tetrameric hemoglobin, carried in red blood cells, to breathe. There are multiple types of hemoglobin that have been found in the human body alone. Hemoglobin A is the “normal” hemoglobin, the variant of hemoglobin that is most common after birth. Hemoglobin A2 is a minor component of hemoglobin found in red blood cells. Hemoglobin A2 makes up less than 3% of total red blood cell hemoglobin. Hemoglobin F typically is only found in the fetal stage of development. While Hemoglobin F falls dramatically after birth, it is possible for some people to produce some levels of Hemoglobin F throughout their full life.
The substance is quickly and almost completely absorbed from the gut. Highest blood plasma concentrations are reached after two hours. It is bound to plasma proteins to 80–90%. Concentrations in the synovial fluid and membranes, muscle and bone are higher than in the blood. Apart from the active metabolite indometacin, a number of inactive metabolites are found after application of acemetacin: the O-desmethyl-, des-4-chlorobenzoyl-, and O-desmethyl-des-4-chlorobenzoyl derivatives of both indometacin and acemetacin, as well as all of these substances' glucuronides (mediated at least partly by the enzyme UGT2B7). Elimination half-life is 4.5±2.8 hours (in some individuals up to 16 hours) under steady state conditions. 40% are eliminated via the kidney, and 50% via the faeces.
=== Exercise-induced regulation of genes in muscles === Gene expression in muscle is largely regulated, as in tissues generally, by regulatory DNA sequences, especially enhancers. Enhancers are non-coding sequences in the genome that activate the expression of distant target genes, by looping around and interacting with the promoters of their target genes (see Figure "Regulation of transcription in mammals"). As reported by Williams et al., the average distance in the loop between the connected enhancers and promoters of genes is 239,000 nucleotide bases.
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.
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.