The short version of Metabolite fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-05-28. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Common name | Cardarine | Also called GW501516 and endurobol. |
| Chemical formula | C21H18F3NO3S2 | Molecular weight about 453.5 g/mol. |
| Appearance | White to off-white solid | Form depends on synthesis and purity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, protected from light | Common for research chemicals. |
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.
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.
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.
A common misconception is that cardarine has been proven safe for human use. In reality, human clinical data are limited, and long-term animal studies have raised concerns about cancer. Another misconception is that it is a supplement or vitamin-like compound. It is a synthetic research chemical with no approved medical indication. Scientific discussion often focuses on its mechanism and detection rather than therapeutic use. Regulatory and anti-doping literature treats it primarily as a prohibited substance.
== Education and early career == Barran went to Godolphin and Latymer School. She moved to the University of Manchester to study chemistry, graduating in 1994. She joined the University of Sussex for her graduate studies, working with Harry Kroto and Tony Stace.
== Pharmacokinetics == After vericiguat is administered (10 mg by mouth once daily), the average steady state and Cmax and AUC for patients with cardiovascular failure is 350 mcg/L and 6,680 mcg/h/L with a Tmax of one hour. Vericiguat has a positive food effect, and therefore patients are advised to consume food with the drug for an oral bioavailability of 93%. Vericiguat is extensively protein bound in plasma. Vericiguat is primarily metabolized via phase 2 conjugation reactions, with a minor CYP-mediated oxidative metabolite. The major metabolite is glucuronidated and inactive. The typical half-life profile for patients with heart failure is 30 hours. Vericiguat has a decreased clearance in patients with systolic heart failure.
Given this uncertainty, between April–May 2006 at the JINR, a FLNR–PSI team conducted experiments probing the synthesis of this isotope as a daughter in the nuclear reaction 242Pu(48Ca,3n)287Fl. (The 242Pu + 48Ca fusion reaction has a slightly larger cross-section than the 238U + 48Ca reaction, so that the best way to produce copernicium for chemical experimentation is as an overshoot product as the daughter of flerovium.) In this experiment, two atoms of copernicium-283 were unambiguously identified and the adsorption properties were interpreted to show that copernicium is a more volatile homologue of mercury, due to formation of a weak metal-metal bond with gold. This agrees with general indications from some relativistic calculations that copernicium is "more or less" homologous to mercury. However, it was pointed out in 2019 that this result may simply be due to strong dispersion interactions. In April 2007, this experiment was repeated and a further three atoms of copernicium-283 were positively identified. The adsorption property was confirmed and indicated that copernicium has adsorption properties in agreement with being the heaviest member of group 12. These experiments also allowed the first experimental estimation of copernicium's boiling point: 84+112−108 °C, so that it may be a gas at standard conditions. Because the lighter group 12 elements often occur as chalcogenide ores, experiments were conducted in 2015 to deposit copernicium atoms on a selenium surface to form copernicium selenide, CnSe.
When supported by external democratic actors, coup leaders have an incentive to push for elections to retain external support and consolidate domestic legitimacy. When condemned, coup leaders are apt to trend toward authoritarianism to assure their survival. But coup conspirators also increasingly say that they chose a coup to save their country from the autocratic incumbents. Successful conspirators may hold free and fair elections simply because they think it is a good idea. A desire for economic growth and legitimacy have also been cited as motivations for democratization. Legal scholar Ilya Somin believes that a coup to forcibly overthrow a democratic government might sometimes be justified. Commenting on the 2016 Turkish coup d'état attempt, Somin opined,
Sources: en.wikipedia.org
Network analysis seeks to understand the relationships within biological networks such as metabolic or protein–protein interaction networks. Although biological networks can be constructed from a single type of molecule or entity (such as genes), network biology often attempts to integrate many different data types, such as proteins, small molecules, gene expression data, and others, which are all connected physically, functionally, or both. Systems biology involves the use of computer simulations of cellular subsystems (such as the networks of metabolites and enzymes that comprise metabolism, signal transduction pathways and gene regulatory networks) to both analyze and visualize the complex connections of these cellular processes. Artificial life or virtual evolution attempts to understand evolutionary processes via the computer simulation of simple (artificial) life forms.
==== Solid state ==== Few neptunium(III) coordination compounds are known, because Np(III) is readily oxidized by atmospheric oxygen while in aqueous solution. However, sodium formaldehyde sulfoxylate can reduce Np(IV) to Np(III), stabilizing the lower oxidation state and forming various sparingly soluble Np(III) coordination complexes, such as Np2(C2O4)3·11H2O, Np2(C6H5AsO3)3·H2O, and Np2[C6H4(OH)COO]3. Many neptunium(IV) coordination compounds have been reported, the first one being (Et4N)Np(NCS)8, which is isostructural with the analogous uranium(IV) coordination compound. Other Np(IV) coordination compounds are known, some involving other metals such as cobalt (CoNp2F10·8H2O, formed at 400 K) and copper (CuNp2F10·6H2O, formed at 600 K). Complex nitrate compounds are also known: the experimenters who produced them in 1986 and 1987 obtained single crystals by slow evaporation of the Np(IV) solution at ambient temperature in concentrated nitric acid and excess 2,2′-pyrimidine. The coordination chemistry of neptunium(V) has been extensively researched due to the presence of cation–cation interactions in the solid state, which had been already known for actinyl ions. Some known such compounds include the neptunyl dimer Na4(NpO4)2C12O12·8H2O and neptunium glycolate, both of which form green crystals. Neptunium(VI) compounds range from the simple oxalate NpO2C2O4 (which is unstable, usually becoming Np(IV)) to such complicated compounds as the green (NH4)4NpO2(CO3)3.
== Early years and education == Hans Charles Freeman was the first and only son of Karl and Lotte Freeman and was born in Breslau in Germany in 1929 (now Wrocław, Poland). In 1938, following a tip-off from a Nazi party member, Karl decided to relocate his Jewish family to Australia. Karl brought his knowledge of detergents (a novelty in Australia at the time) to his new homeland, applying it to the problem of cleaning blood-stained blankets that would otherwise be wasted. After the war, he founded K. H. Freeman Pty Ltd, a detergent and soap manufacturing company; Hans spent many weekends working in the factory, gaining a practical insight into chemistry. Hans adapted well to his new environment, quickly mastering his new language and demonstrating his outstanding scholastic ability. He was dux of his primary school, dux of Sydney Boys High in 1945, and took his bachelor's degree with the university medal in chemistry in 1949. He was one of the ten chemistry students in his class at Sydney Boys High to go on to become Professors of Chemistry. After receiving his MSc in 1952 under the supervision of Raymond Le Fèvre FRS, Freeman attended Caltech on a Rotary Foundation Fellowship where, at the urging of Linus Pauling, he learned the fundamentals of crystallography. He received a PhD in 1957 for his work on the structure of biuret hydrate, where he completed most of the calculations for the crystal structure by hand.
Sources: en.wikipedia.org
Determining a mechanism of action at the interface of the materials and biology is important if these novel clinical results have shown impact to the resolution of sleep apnea downstream. It can then be applied to all forms of dental devices and protocols. In the end, 'The development of an OSA treatment that is simple, affordable, comfortable, noninvasive, effective at all severity levels, and accepted by most patients is still the holy grail of sleep medicine'.
=== Contraindications === Known or suspected mechanical GI obstruction. Known hypersensitivity to lubiprostone or any ingredient in the formulation. The effects on pregnancy have not been studied in humans, but testing in guinea pigs resulted in fetal loss. Lubiprostone is contraindicated in people exhibiting chronic diarrhea, bowel obstruction, or diarrhea-predominant irritable bowel syndrome.
=== Synopsis === In the beginning, there was Winter only. Unable to bear the loneliness in a world devoid of other seasons, he chose to cut off part of his vital essence to generate a new season, to whom he gave the name of "Spring". At the Mother Earth's wish, Winter again cut off his vital essence to give birth to Summer and Autumn, thus beginning the cycle of the four seasons. The Four Seasons visited every single corner of the world to perpetuate the cycle, until one day they decided to entrust this mission to Mother Earth's creatures, but none were capable of fulfilling the task. The Four Seasons fell into despair at having failed in their desired goal, until mankind made its appearance, willing to perform their duty in exchange for peace, prosperity and stability in its lands. The four deites of the seasons thus granted their powers to a small group of humans, who, over the centuries, have come to be known as the Agents of the Four Seasons.
Sources: en.wikipedia.org
Cardarine is a common name for the investigational compound GW501516. It acts as a PPARδ agonist and is not approved for human use. It is prohibited in sport.
It activates PPARδ, a nuclear receptor that influences gene expression related to lipid and energy metabolism. Animal studies show changes in endurance and lipid levels. Human effects and risks are not well established.
No, cardarine is not a steroid. It belongs to a different chemical class, the PPARδ agonists. It is also not a selective androgen receptor modulator.
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.