Research chemical 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.
Last reviewed on 2025-08-07. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
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.
| 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 |
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.
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.
[A]n overwhelming preponderance of power [...] will remain wholly unattainable unless the Allies win the present war and the United States assumes responsibilities commensurate with its power—in the war, in the peace after the war and in the maintenance and improvement of the new order after the peace. The necessary preponderance of power is unlikely to emerge from any international combination other than a permanent alliance of the United States, the British Commonwealth of Nations, and the French Republic, with the addition of such Latin American states and such European democracies as may care to join. Such a coalition, if stable and permanent, could put an end to the world balance of power and oblige outside powers to abandon the game of power politics. No other coalition presently in prospect would seem to offer any comparable hope. In 1941, Alfred Vagts wrote an article, titled "The United States and the Balance of Power," in which he recalled the words of Thomas Jefferson:
== Chemistry == Chemically, dipipanone belongs to the class of opioids called the 4,4-diphenylheptane-3-ones. It closely resembles methadone, the only structural difference being the N,N-dimethyl moiety of methadone being replaced with a piperidine ring. Other related compounds with equivalent activity where the piperidine ring has been replaced by other groups, include the morpholine derivative phenadoxone, as well as the corresponding pyrrolidine derivative dipyanone. The synthesis is the same as for phenadoxone, with the exception that piperidine is used in lieu of morpholine. Related compounds with an isoquinuclidine ring such as nufenoxole are also known.
An update to Two Point Hospital (2020) on Steam added a patient suffering from a Headcrab attack, while the Steam release of Super Meat Boy featured a playable Headcrab. The Headcrab has received multiple pieces of merchandise, including a 1/4 scale Headcrab Zombie and a plush.
=== Circadian rhythm === There is evidence to suggest that adropin levels exhibit a circadian rhythm, meaning they follow a natural 24-hour cycle. Circadian rhythms play a vital role in regulating various physiological processes, including sleep-wake cycles, hormone secretion, and metabolism.
Sources: en.wikipedia.org
=== Safranine === Safranine (or Safranine O) is a red cationic dye. It binds to nuclei (DNA) and other tissue polyanions, including glycosaminoglycans in cartilage and mast cells, and components of lignin and plastids in plant tissues. Safranine should not be confused with saffron, an expensive natural dye that is used in some methods to impart a yellow colour to collagen, to contrast with blue and red colours imparted by other dyes to nuclei and cytoplasm in animal (including human) tissues. The incorrect spelling "safranin" is in common use. The -ine ending is appropriate for safranine O because this dye is an amine.
Mohammad-Nabi Sarbolouki (Persian: محمدنبی سربلوکی) was a distinguished Iranian biophysicist and polymer chemist and one of the most influential individuals behind modern scientific movement in Iran. He was known as the inventor of a DNA vehicle called "dendrosome". Sarbolouki was one of the main founders and pioneers of nano science, biomaterials, biotechnology and biophysics in Iran. Sarbolouki studied chemistry at Tehran University and did his PhD in Macromolecular Physical Chemistry at Polytechnic University of New York. He then spent two years at Michigan State University as a postdoctoral fellow. Sarbolouki then joined NASA where he worked as a group leader till 1981. Sarbolouki had numerous publications and patents on various subjects ranging from engineering to basic sciences. He initiated biomaterial research in Iran and was among the first to do structural biology in the country. He made significant contribution to the field of lipid bilayer membranes and liposomes, biodegradable polymers, tissue engineering, nanospheres (magnetic/fluorescent) and drug delivery. Sarbolouki was of the founding members of Iranian Society of Nanotechnology, Iranian Society of Proteomics and Iranian Chemical Society. He founded the first Biomaterial Research Center in Iran as well as National Research Center for Genetic Engineering and Biotechnology, ICGEB headquarter in Iran. Sarbolouki was involved in science policy making at the national level and was instrumental in the advancement of interdisciplinary and applied research in Iran.
=== Asparagine === The biosynthesis of asparagine originates with aspartate using a transaminase enzyme. The enzyme asparagine synthetase produces asparagine, AMP, glutamate, and pyrophosphate from aspartate, glutamine, and ATP. In the asparagine synthetase reaction, ATP is used to activate aspartate, forming β-aspartyl-AMP. Glutamine donates an ammonium group, which reacts with β-aspartyl-AMP to form asparagine and free AMP.
Sources: en.wikipedia.org
== Signs and symptoms == Some signs and symptoms of malnutrition in older adults may include unintended weight loss, tiredness and fatigue, muscle weakness or loss of strength, constipation, dizziness, syncope, gastritis, peptic ulcers, paleness of the skin, poor wound healing, depression, problems with memory, a weak immune system, and anemia.
=== Publications === In 2003, Austin released his autobiography The Stone Cold Truth which was co written alongside Jim Ross. The book goes over his entire life up that point from his childhood in Texas to his to the top of the WWE, while also giving behind the scenes look at Austin what he was going through during his career with him sharing his firsthand experiences.
=== Electronic spectrum === Electrons propagating through the graphene honeycomb lattice effectively lose their mass, producing quasi-particles described by a 2D analogue of the Dirac equation rather than the Schrödinger equation for spin-1/2 particles.
Myoepithelial cells (sometimes referred to as myoepithelium) are cells usually found in glandular epithelium as a thin layer above the basement membrane but generally beneath the luminal cells. These may be positive for alpha smooth muscle actin and can contract and expel the secretions of exocrine glands. They are found in the sweat glands, mammary glands, lacrimal glands, and salivary glands. Myoepithelial cells in these cases constitute the basal cell layer of an epithelium that harbors the epithelial progenitor. In the case of wound healing, myoepithelial cells reactively proliferate. Presence of myoepithelial cells in a hyperplastic tissue proves the benignity of the gland and, when absent, indicates cancer. Only rare cancers like adenoid cystic carcinomas contains myoepithelial cells as one of the malignant components. It can be found in endoderm or ectoderm.
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.
Rodent studies reported increased endurance and fat oxidation after GW501516 exposure. Long-term studies also found higher rates of some tumors, which led to halted development.