This is a working overview of research chemical, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-06-09. Anything still debated is marked as such rather than presented as settled.
Cardarine has no approved therapeutic indication and is not marketed as a medicine. The World Anti-Doping Agency lists GW501516 as a prohibited substance at all times, covering both in-competition and out-of-competition periods. National laws vary: some countries treat it as an unapproved drug subject to import controls, while others have specific restrictions on sale for human consumption. It is often sold as a research chemical, a label that does not imply safety or legality. Enforcement actions have targeted online vendors and shipments.
Anti-doping laboratories identify GW501516 and related metabolites using liquid chromatography coupled with tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be analyzed. The method targets the parent compound and phase I and phase II metabolites, which extend the detection window. Because the substance is prohibited at all times, athletes can be tested outside competition. Detection limits and windows depend on the assay, sample type, and individual metabolism.
Cardarine is frequently described as a fat-burning or endurance-enhancing supplement, but these claims exceed the available evidence. The compound is not a hormone, steroid, or selective androgen receptor modulator. Research articles discuss it as a tool compound for studying PPARδ biology, while anti-doping literature focuses on its abuse and detection. Quality of unapproved products is uncertain, and independent analyses have found impurities or incorrect labeling. Open questions include whether human cancer risk resembles that seen in rodents and how often non-athletes use the substance.
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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport; not approved as medicine | Listed by WADA at all times. |
| Common synonyms | GW501516, GW-501516, endurobol | Cardarine is a colloquial name. |
| Typical analytical method | LC-MS/MS | Detects parent compound and metabolites. |
| Common test matrix | Urine | Blood and dried blood spots also possible. |
| Legal classification | Varies by country | Often treated as unapproved drug or research chemical. |
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.
At the molecular level, GW501516 binds and activates PPARδ, a nuclear receptor that regulates transcription. Activation shifts expression of genes involved in fatty acid oxidation, energy expenditure, and lipid transport in skeletal muscle and liver. Animal studies report increased endurance and altered lipid profiles after exposure. Human data are limited to small trials and do not establish long-term safety or efficacy. PPARδ also has roles in cell proliferation, so the relationship between activation and cancer risk remains an open question.
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.
Regulatory bodies treat GW501516 as a prohibited substance in competitive sport. The World Anti-Doping Agency added it to the prohibited list, and it falls under classes covering metabolic modulators and hormone-related agents. It is not approved by drug regulators for human use, and it is not a lawful dietary supplement. Products sold under the cardarine name may contain unlisted ingredients or different compounds. Because no approved product exists, quality and identity are not guaranteed by pharmaceutical manufacturing standards.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
GW501516 acts on PPARδ, a nuclear receptor that helps regulate fatty acid oxidation and energy homeostasis. In animal studies, activation of this receptor was associated with increased endurance and changes in lipid metabolism. Human trials examined effects on blood lipids and other metabolic markers, but the compound did not advance to approval. Rodent studies later reported tumors in multiple tissues at doses used in those experiments. Whether those findings translate to human risk remains uncertain, and the clinical relevance of the animal data is still debated.
=== CANOPUS: Compound class prediction === CANOPUS is short for class assignment and ontology prediction using mass spectrometry. It predicts the compound classes from the molecular fingerprint predicted by CSI:FingerID. This approach is completely database-free, i.e. it is not even limited to molecules that are listed in structure databases. CANOPUS employs a deep neural network (DNN) to predict 2,497 compound classes. The DNN was trained on 4.10 million compound structures with compound classes assigned by ClassyFire. No MS/MS data was used for training, but instead simulated 'realistic' probabilistic fingerprints for the training molecular structures were used. The DNN predicts all compound classes simultaneously. For full biological datasets, CANOPUS provides a comprehensive overview of compound classes present in the sample and allows for comparisons between different cohorts at compound class level.
However, the Center does not count itself as and is not perceived to be a think tank in the contemporary sense. During the 1960s, the phrase "think tank" was attached more broadly to meetings of experts, electronic computers, and independent military planning organizations. The prototype and most prominent example of the third category was the RAND Corporation, which was founded in 1946 as an offshoot of Douglas Aircraft and became an independent corporation in 1948. In the 1970s, the phrase became more specifically defined in terms of RAND and others. During the 1980s and 1990s, the phrase evolved again to arrive at its broader contemporary meaning of an independent public policy research institute. For most of the 20th century, such institutes were found primarily in the United States, along with much smaller numbers in Canada, the United Kingdom, and Western Europe. Although think tanks had also existed in Japan for some time, they generally lacked independence, having close associations with government ministries or corporations. There has been a veritable proliferation of "think tanks" around the world that began during the 1980s as a result of globalization, the end of the Cold War, and the emergence of transnational problems. Two-thirds of all the think tanks that exist today were established after 1970 and more than half were established since 1980.
The original fragile and heavy glass containers presented challenges for transportation, and glass jars were largely replaced in commercial canneries with cylindrical tin can or wrought-iron canisters (later shortened to "cans") following the work of Peter Durand (1810). Cans are cheaper and quicker to make, and much less fragile than glass jars. Can openers were not invented for another thirty years. At first, soldiers would cut the cans open with bayonets or smash them open with rocks. Today, tin-coated steel is the material most commonly used. Aseptically processed retort pouches are also used for canning. Glass jars have remained popular for some high-value products and in home canning.
Sources: en.wikipedia.org
Tolkien never expected his stories to become popular, but by sheer accident a book called The Hobbit, which he had written some years before for his own children, came in 1936 to the attention of Susan Dagnall, an employee of the London publishing firm George Allen & Unwin, who persuaded Tolkien to submit it for publication. When it was published a year later, the book attracted adult readers as well as children, and it became popular enough for the publishers to ask Tolkien to produce a sequel.
The CHDI Foundation funds research initiatives providing many publications. The CHDI foundation is the largest funder of Huntington's disease research globally and aims to find and develop drugs that will slow the progression of HD. CHDI was formerly known as the High Q Foundation. In 2006, it spent $50 million on Huntington's disease research. CHDI collaborates with many academic and commercial laboratories globally and engages in oversight and management of research projects as well as funding. A study found higher intelligence scores in children and young adults at risk for HD.
== Terminology == Desmoplasia originates from the Ancient Greek δεσμός desmos, 'knot, bond' and πλάσις plasis, 'formation'. It is usually used in the description of desmoplastic small round cell tumors. Neoplasia is the medical term used for both benign and malignant tumors, or any abnormal, excessive, uncoordinated, and autonomous cellular or tissue growth.
Sources: en.wikipedia.org
A plantar fascial rupture, is a painful tear in the plantar fascia. The plantar fascia is a connective tissue that spans across the bottom of the foot. The condition plantar fasciitis may increase the likelihood of rupture. A plantar fascial rupture may be mistaken for plantar fasciitis or even a calcaneal fracture. To allow for proper diagnosis, an MRI is often needed.
Risk factors for complications and death include age, hemodynamic parameters (such as heart failure, cardiac arrest on admission, systolic blood pressure, or Killip class of two or greater), ST-segment deviation, diabetes, serum creatinine, peripheral vascular disease, and elevation of cardiac markers.
Hydroxychloroquine, sold under the brand name Plaquenil among others, is a medication used to prevent and treat malaria in areas where malaria remains sensitive to chloroquine. Other uses include treatment of rheumatoid arthritis, lupus, and porphyria cutanea tarda. It is taken by mouth, often in the form of hydroxychloroquine sulfate. Common side effects may include vomiting, headache, blurred vision, and muscle weakness. Severe side effects may include allergic reactions, retinopathy, and irregular heart rate. Although all risk cannot be excluded, it remains a treatment for rheumatic disease during pregnancy. Hydroxychloroquine is in the antimalarial and 4-aminoquinoline families of medication. Hydroxychloroquine was approved for medical use in the United States in 1955. It is on the World Health Organization's List of Essential Medicines. In 2023, it was the 131st most commonly prescribed medication in the United States, with more than 4 million prescriptions. Hydroxychloroquine has been studied for an ability to prevent and treat coronavirus disease 2019 (COVID-19), but clinical trials found it ineffective for this purpose and a possible risk of dangerous side effects. Among studies that deemed hydroxychloroquine intake to cause harmful side effects, a publication by The Lancet was retracted due to data flaws. The speculative use of hydroxychloroquine for COVID-19 threatens its availability for people with established indications.
=== Negative symptoms === Negative symptoms are those for which function is lost: muscle weakness, atrophy, numbness, diminished or absent reflexes. These symptoms represent a conduction blockade where nerve signals can't be adequately transmitted along the length of the nerve. These symptoms are caused specifically by metabolic blocks, demyelination, and axonmetesis. A metabolic block is the temporary deprivation of nourishment from the blood supply which is readily reversed if the ischema does not last too long. Demyelination will interfere with conduction of signals along the nerve. Axonmetesis will result in a complete conduction block as Wallerian degeneration will destroy every part of the axon distal to the lesion if/until the axon regrows completely to its most distal innervation target.
Sources: en.wikipedia.org
Legal status varies by country. It is not approved as a medicine, and it is prohibited in sport. Some jurisdictions restrict import, sale, or possession.
Laboratories use liquid chromatography-tandem mass spectrometry to detect GW501516 and its metabolites. Urine is commonly tested, and testing can occur in and out of competition.
No, cardarine is not a SARM. It is a PPARδ agonist, which acts on a different receptor. The two classes are often confused in online discussions.
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.