GW501516 raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-01-08. Anything still debated is marked as such rather than presented as settled.
Cardarine is a common name for GW501516, a synthetic compound developed in the 1990s through research collaborations involving GlaxoSmithKline. It belongs to a class of molecules known as peroxisome proliferator-activated receptor delta agonists. Early studies explored its effects on lipid metabolism and energy expenditure in animal models. The compound was never approved as a human medicine, and clinical development was discontinued. In the years since, it has appeared in fitness and bodybuilding communities as a performance-enhancing substance. Regulatory agencies classify it as an unapproved drug.
PPARδ is a nuclear receptor that regulates gene expression related to fatty acid oxidation, glucose homeostasis, and mitochondrial function. GW501516 binds to this receptor with high affinity and activates downstream signaling in skeletal muscle and other tissues. Animal studies reported increased endurance and altered fuel preference, but human data remain limited and inconsistent. The precise relationship between receptor activation and observed physiological changes is still an area of active investigation. Researchers have also examined whether the compound affects inflammation or cell proliferation. No approved therapeutic indication exists for cardarine.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
Preclinical research reported that GW501516 increased running endurance in mice and improved lipid profiles in some animal species. Early human trials explored effects on high-density lipoprotein cholesterol, triglycerides, and glucose handling, but the program was discontinued. Published human data are sparse and do not establish efficacy for any condition. Studies also examined PPAR delta in cancer biology, with conflicting findings across models. The relationship between receptor activation, tissue context, and disease risk remains an active area of investigation.
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
| Property | Value | Notes |
|---|---|---|
| CAS Registry Number | 317318-70-0 | Unique identifier for the compound. |
| Chemical class | PPARδ agonist | Synthetic ligand for peroxisome proliferator-activated receptor delta. |
| Appearance | White to off-white solid | Typical form of research-grade material. |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water. |
| Typical storage | -20°C | Recommended for long-term storage of stock solutions. |
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
Cardarine is a common name for GW501516, a synthetic compound first described in the 1990s as a selective agonist of the peroxisome proliferator-activated receptor delta. It was studied in preclinical models for metabolic and cardiovascular conditions, but it has not been approved as a medicine in the United States, Europe, or other major jurisdictions. Retail products labeled as cardarine are generally research chemicals or supplements, not pharmaceutical formulations. Because human safety and efficacy data remain limited, regulatory agencies treat it as an unapproved substance rather than a therapeutic product.
Sporting authorities added GW501516 to prohibited lists after it appeared in athlete samples and online markets. The World Anti-Doping Agency classifies it as a hormone and metabolic modulator, and its use can lead to an anti-doping rule violation. Some early laboratory work suggested effects on fatty acid oxidation and endurance-related metabolism in animals, but those findings do not establish safe or effective use in people. Reports of adverse events in humans are scarce and often anecdotal, which complicates risk assessment.
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.
GW501516 binds and activates PPARδ, a nuclear receptor that influences transcription of genes involved in fatty acid oxidation and energy use. Activation shifts some metabolic pathways in preclinical models, which is why the compound has been studied for lipid disorders and exercise-related endpoints. The exact downstream effects in humans are incompletely mapped. PPARδ is expressed in many tissues, including skeletal muscle, liver, and adipose tissue, so broad activation may have varied consequences. Researchers continue to examine how selective or partial activation might alter the balance between benefits and risks.
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
Methanogens rely on such enzymes to catalyze the reduction of CO2 to methane. One step in methanogenesis entails conversion of a methenyl group (formic acid oxidation state) to a methylene group (formaldehyde oxidation state). Among the hydrogenase family of enzymes, Hmd is unique in that it does not directly reduce CO2 to CH4. The natural substrate of the enzyme is the organic compound methenyltetrahydromethanopterin. The organic compound includes a methenyl group bound to two tertiary amines. The methenyl group originated as CO2 before being incorporated into the substrate, which is catalytically reduced by H2 to methylenetetrahydromethanopterin as shown. Eventually the methylene group is further reduced and released as a molecule of methane. The hydride transfer has also been shown to be stereospecific. Given that the substrate is planar the hydride originating from H2 is always added to the pro-R face. In the reverse reaction stereospecificity is maintained and the highlighted hydride is removed.
DNA nanotechnology uses the unique molecular recognition properties of DNA and other nucleic acids to create self-assembling branched DNA complexes with useful properties. DNA is thus used as a structural material rather than as a carrier of biological information. This has led to the creation of two-dimensional periodic lattices (both tile-based and using the DNA origami method) and three-dimensional structures in the shapes of polyhedra. Nanomechanical devices and algorithmic self-assembly have also been demonstrated, and these DNA structures have been used to template the arrangement of other molecules such as gold nanoparticles and streptavidin proteins. DNA and other nucleic acids are the basis of aptamers, synthetic oligonucleotide ligands for specific target molecules used in a range of biotechnology and biomedical applications.
Loading buffers often contain anionic dyes that are visible under the visible light spectrum, and are added to the gel before the nucleic acid. Tracking dyes should not be reactive so as not to alter the sample, and move down the gel with the DNA or RNA sample. Commonly used color markers include Bromophenol blue, Cresol Red, Orange G and Xylene cyanol. Xylene and bromophenol blue are the most commonly used dyes. Generally speaking, Orange G migrates faster than bromophenol blue, which migrates faster than xylene cyanol, but the apparent "sizes" of these dyes (compared to DNA molecules) varies with the concentration of agarose and the buffer system used. For instance, in a 1% agarose gel made in TAE buffer (Tris-acetate-EDTA), xylene cyanol migrates at the speed of a 3000 base pair (bp) molecule of DNA and bromophenol blue migrates at 400 bp. However, in a 1% gel made in TBE buffer (Tris-borate-EDTA), they migrate at 2000 bp and 250 bp respectively.
Anthrax disease in humans results from infection with toxin producing Bacillus anthracis strains that can be inhaled, ingested in contaminated food or drink, or obtained through breaks in the skin like cuts or scrapes. Domestic and wild animals can also be infected via inhalation or ingestion. Depending on the route of entry, disease can present initially as inhalation anthrax, cutaneous anthrax, or gastrointestinal anthrax, but eventually will spread throughout the body, resulting in death, if not treated with antibiotics. Anthrax toxin is composed of three domains: protective antigen (PA), edema factor (EF), and lethal factor (LF). EF is an adenylate cyclase that targets ATP. LF enzyme is a metalloprotease that confers the lethal phenotype associated with anthrax disease. As LF is the agent responsible for the death of infected hosts, it is classified in the group of lethal toxins.
Sources: en.wikipedia.org
14 December Scientists report that genes inherited by modern humans from Neanderthals and Denisovans may biologically influence the daily routine of modern humans, specifically their chronotype. Astronomers report the first time discovery, in the plumes of Enceladus, moon of the planet Saturn, of hydrogen cyanide, a possible chemical essential for life as we know it, as well as other organic molecules, some of which are yet to be better identified and understood. According to the researchers, "these [newly discovered] compounds could potentially support extant microbial communities or drive complex organic synthesis leading to the origin of life." 15 December – Google DeepMind claims to have made the first ever scientific discovery with an AI chatbot by building a fact-checker to filter out useless outputs, leaving useful solutions to mathematical or computing problems. 19 December – COVID-19: The World Health Organization designates JN.1, part of the BA.2.86 SARS-CoV-2 lineage, as its own variant of interest. This follows a recent, rapid rise in case numbers around the world. 20 December A new class of antibiotic candidates, able to kill methicillin-resistant Staphylococcus aureus (MRSA) is identified using deep learning. An experimental study reports online search to evaluate the truthfulness of false news articles increases the probability of believing them, especially for those for whom search engines return lower-quality information. It suggests media literacy programs with tested strategies and solutions for identified search engines issues are needed.
Chapter 12 of the 1992 Constitution of Ghana guarantees freedom of the press and independence of the media, while Chapter 2 prohibits censorship. Post-independence, private outlets closed during the military governments, and media laws prevented criticism of government. Press freedoms were restored in 1992, and after the election in 2000 of Kufuor, the tensions between the private media and government decreased. Kufuor supported press freedom and repealed a libel law, and maintained that the media had to act responsibly. The media have been described as "one of the most unfettered" in Africa.
Neutrophil Neutrophils are the most common white blood cells in normal adult blood. When stained with a Romanowsky stain, they exhibit a multi-lobed nucleus and pink cytoplasm that contains small purple granules. The neutrophil count is normally higher in newborns and pregnant women than in other groups. Outside of these conditions, increased neutrophil counts (neutrophilia) are associated with bacterial infection, inflammation, and various forms of physiological stress. Neutrophil counts can become extremely high in response to some infections and inflammatory states, which is termed leukemoid reaction because the high white blood cell count mimics leukaemia. Neutrophilia may also occur in myeloproliferative disorders.Neutropenia, meaning a low neutrophil count, may occur as a response to drug treatment (especially chemotherapy) or in certain infections, such as tuberculosis and Gram-negative sepsis. Neutropenia also occurs in many hematologic disorders, such as leukaemia and myelodysplastic syndrome, and in a variety of autoimmune and congenital diseases. A neutrophil count below the reference interval may be normal in individuals of certain ethnicities; this is termed benign ethnic neutropenia. Very low neutrophil counts are associated with immunosuppression. When stimulated by infection or inflammation, neutrophils may develop abnormal features in their cytoplasm, such as toxic granulation, toxic vacuolation and Döhle bodies. These features, which are caused by the release of cytokines, are collectively known as toxic changes.
Madak was a blend of opium and tobacco used as a recreational drug in 16th- and 17th-century China. It emerged in southern coastal areas in the first half of the 17th century. In the last quarter of the 18th century madak was phased out by raw opium. The prohibition of madak in 1729 may have been a contributing factor to the increase in popularity of smoking pure opium. Raw opium was introduced in China by Arab merchants. Rather than taking bitter raw opium orally, the Chinese attempted smoking opium mixed with other substances. According to Dikotter et al., smoking opium blended with tobacco was introduced in China by the Dutch traders between 1624 and 1660. Madak was prepared by blending opium from Java with domestic Chinese hemp and herbs, boiling the mix in pans and, finally, mixing with tobacco. It was smoked in bamboo pipes with coir fibre filter. The new addiction was limited to coastal territories around Taiwan Strait; further spread was hampered by the civil war that accompanied the fall of the Ming Dynasty. The new Qing Dynasty government was not aware of madak until 1683. The lucrative opium business continued spreading along the coast of Southern China, although exact chronology of this spread remains unknown. By 1720 the government saw madak smoking as a social evil that has corrupted not just the lowest classes, but the "good families" too. Smoking dens, where people congregated at night, were deemed as dangerous as heretical cults and political conspiracies. In 1729 the Yongzheng Emperor banned recreational smoking of madak. Medicinal use remained permitted.
Mepitiostane, also known as epitiostanol 17β-(1-methoxy)cyclopentyl ether, is a synthetic androstane steroid and a derivative of DHT. It is the C17β (1-methoxy)cyclopentyl ether of epitiostanol, which itself is 2α,3α-epithio-DHT or 2α,3α-epithio-5α-androstan-17β-ol. A related AAS is methylepitiostanol (17α-methylepitiostanol), which is an orally active variant of epitiostanol similarly to mepitiostane, though also has a risk of hepatotoxicity.
Sources: en.wikipedia.org
Ionization of acids is less in an acidic solvent than in water. For example, hydrogen chloride is a weak acid when dissolved in acetic acid. This is because acetic acid is a much weaker base than water.
==== Oligoarticular arthritis (Oligoarthritis) ==== Oligoarticular (or pauciarticular) JIA is the most common JIA subtype, and occurs when there are up to four joints involved during the first six months of disease. Two subtypes of oligoarticular arthritis exist: persistent oligoarthritis, where no more than four joints are affected throughout the whole disease course; and extended oligoarthritis, where more than four joints are affected after the first six months of disease. Patients in this subtype are often young, typically aged between 1 and 5 years, and are female preponderant. The most commonly involved joint is the knee, but other affected joints may include the ankles, wrists, elbows, and others. 50% of cases involve mono-arthritis, only involving the knee. The anti-nuclear antigen (ANA) is positive in up to 80% of patients with oligoarthritis and is associated with a higher risk of associated eye disease (uveitis), particularly in younger patients. There is no adult counterpart disease to oligoarticular JIA. The prefixes oligo- and pauci- mean 'few'.
It was first synthesised in 1811 by Pierre Louis Dulong, who lost three fingers and an eye to its explosive tendencies. As a dilute gas it is less dangerous and is thus used industrially to bleach and sterilise flour. Nitrogen tribromide (NBr3), first prepared in 1975, is a deep red, temperature-sensitive, volatile solid that is explosive even at −100 °C. Nitrogen triiodide (NI3) is still more unstable and was only prepared in 1990. Its adduct with ammonia, which was known earlier, is very shock-sensitive: it can be set off by the touch of a feather, shifting air currents, or even alpha particles. For this reason, small amounts of nitrogen triiodide are sometimes synthesised as a demonstration to high school chemistry students or as an act of "chemical magic". Chlorine azide (ClN3) and bromine azide (BrN3) are extremely sensitive and explosive. Two series of nitrogen oxohalides are known: the nitrosyl halides (XNO) and the nitryl halides (XNO2). The first is very reactive gases that can be made by directly halogenating nitrous oxide. Nitrosyl fluoride (NOF) is colourless and a vigorous fluorinating agent. Nitrosyl chloride (NOCl) behaves in much the same way and has often been used as an ionising solvent. Nitrosyl bromide (NOBr) is red. The reactions of the nitryl halides are mostly similar: nitryl fluoride (FNO2) and nitryl chloride (ClNO2) are likewise reactive gases and vigorous halogenating agents.
in his eagerness to weaken it, has cut off all possibility of understanding between the two Masonic Bodies existing and recognized in the Republic of Cuba." They also stated that since the signing of the Treaty of Friendship and Mutual Recognition in 1876, whenever a sanction was issued by the Supreme Council, that the Grand Lodge would show solidarity in issuing the same sanction. If Urquía Carreño did not step down, it would not only be a violation of Masonic Law, but also break almost a century and a half of tradition. If the Treaty of Friendship broke down, they said, it would only be an invitation for the State Security Unit to further infiltrate the brotherhood. Urquía Carreño still refused to step down. After this, certain Lodge Masters sent letters to the United States government, requesting that if Urquía Carreño tried to claim asylum there, to deny him this right for his alleged involvement and collaboration with the State Security Unit.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.
No. Cardarine is not an anabolic steroid; it belongs to a different chemical class that targets PPARδ. Steroids act primarily through androgen receptors, while cardarine acts through a nuclear receptor involved in metabolism.
Some rodent studies reported increased endurance and changes in fat metabolism after cardarine exposure. Long-term studies in animals also raised concerns about cancer in certain tissues. Human trial data are limited, so these findings cannot be directly translated to people.
It binds to and activates PPAR delta, a nuclear receptor that controls expression of genes related to fatty acid oxidation. This mechanism can alter energy metabolism in animal models. It is not a direct stimulant or fat-burning enzyme.