GW501516 comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-04-06. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Published studies have examined GW501516 in animal models of obesity, insulin resistance, and exercise endurance. Early human trials reportedly ended, and development was discontinued after preclinical findings raised concerns about cancer in some rodent studies. Regulatory agencies have not approved cardarine for any medical use. Its availability through non-pharmaceutical channels raises questions about identity, purity, and legal status that are separate from its laboratory pharmacology. Those questions are often addressed through analytical testing rather than assumptions about product labels.
Cardarine is a common name for GW501516, also GW-1516, a synthetic compound developed as a peroxisome proliferator-activated receptor delta (PPARδ) agonist. It belongs to a class of agents that modulate gene transcription related to lipid and energy metabolism. The compound was studied in preclinical and early clinical research for metabolic and cardiovascular conditions, but it did not progress to approved therapeutic use. Its name appears in fitness and sports contexts despite not being approved as a drug.
PPARδ is a nuclear receptor that influences transcription of genes involved in fatty acid oxidation, lipid transport, and energy homeostasis. GW501516 binds and activates this receptor with high selectivity relative to PPARα and PPARγ in laboratory assays. Activation alters expression of target genes in skeletal muscle, liver, and adipose tissue in animal models. The exact clinical consequences of these changes in humans remain incompletely characterized, and observed effects in animals do not establish therapeutic benefit or safety.
| Property | Value | Notes |
|---|---|---|
| WADA classification | S4 Hormone and Metabolic Modulators | Prohibited at all times in sport. |
| Drug approval status | Not approved in major jurisdictions | No accepted therapeutic indication. |
| Common detection method | LC-MS/MS | Detects parent compound and metabolites. |
| Typical test matrix | Urine or blood | Urine is common in anti-doping testing. |
| Product labeling | Research chemical or supplement | Often not independently verified. |
In the fitness and bodybuilding literature, cardarine is frequently discussed as an endurance agent or fat-loss compound, although such claims are not supported by robust clinical evidence. Online descriptions often mix animal data, user anecdotes, and marketing language. Researchers who study PPARδ agonists distinguish between receptor activation in controlled experiments and unsupervised use of unverified products. The latter introduces unknown purity, dose, and interactions, making reported experiences difficult to interpret scientifically.
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
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.
The discoverers proposed the name "Prometheum" (sic; the spelling was subsequently changed), derived from Prometheus, the Titan in Greek mythology who stole fire from Mount Olympus and brought it down to humans, to symbolize "both the daring and the possible misuse of mankind's intellect". A sample of the metal was made only in 1963. The two sources of natural promethium are rare alpha decays of natural europium-151 (producing promethium-147) and spontaneous fission of uranium (various isotopes). Promethium-145 is the most stable promethium isotope, but the only isotope with practical applications is promethium-147, chemical compounds of which are used in luminous paint, atomic batteries and thickness-measurement devices. Because natural promethium is exceedingly scarce, it is typically synthesized by bombarding uranium-235 (enriched uranium) with thermal neutrons to produce promethium-147 as a fission product.
Substances that are (nearly) identical to the body's key signaling proteins. Examples are the blood-production stimulating protein erythropoetin, or the growth-stimulating hormone named "growth hormone" or biosynthetic human insulin and its analogues. Monoclonal antibodies. These are similar to the antibodies that the human immune system uses to fight off bacteria and viruses, but they are "custom-designed" (using hybridoma technology or other methods) and can therefore be made specifically to counteract or block any given substance in the body, or to target any specific cell type; examples of such monoclonal antibodies for use in various diseases are given in the table below. Receptor constructs (fusion proteins), usually based on a naturally occurring receptor linked to the immunoglobulin frame. In this case, the receptor provides the construct with detailed specificity, whereas the immunoglobulin structure imparts stability and other useful features in terms of pharmacology. Some examples are listed in the table below. Biologics as a class of medications in this narrower sense have had a profound impact on many medical fields, primarily rheumatology and oncology, but also cardiology, dermatology, gastroenterology, neurology, and others. In most of these disciplines, biologics have added major therapeutic options for treating many diseases, including some for which no effective therapies were available, and others where previously existing therapies were inadequate.
Adjustments to the manufacturing process can affect thickness, panel size, strength, and rigidity. OSB panels have no internal gaps or voids, and can be water-resistant, although they do require additional membranes to achieve impermeability to water and are not recommended for exterior use. The finished product has properties similar to plywood, but is uniform and cheaper. When tested to failure, OSB has a greater load-bearing capacity than milled wood panels. It has replaced plywood in many environments, especially the North American structural panel market. All wood-based structural use panels can be cut and installed with the same types of equipment as for solid wood.
== History == Nitrogen mustards arose from the derivatization of sulphur mustard gas after military personnel exposed to it during World War I were observed to have decreased white blood cell counts. Since the sulphur mustard gas was too toxic to be used in humans, Gilman hypothesized that by reducing the electrophilicity of the agent, which made it highly chemically reactive towards electron-rich groups, then less toxic drugs could be obtained. To this end, he made analogues that were less electrophilic by exchanging the sulphur with a nitrogen, leading to the nitrogen mustards. With an acceptable therapeutic index in humans, nitrogen mustards were first introduced in the clinic in 1946. Aliphatic mustards were developed first, such as mechlorethamine hydrochloride (mustine hydrochloride), which is still used in the clinic today. In the 1950s, aromatic mustards like chlorambucil were introduced as less toxic alkylating agents than the aliphatic nitrogen mustards, proving to be less electrophilic and react with DNA more slowly. Additionally, these agent can be administered orally, a significant advantage. Chlorambucil was first synthesized by Everett et al.
In February 2022, Castillo held a bilateral meeting with then Brazilian president Jair Bolsonaro in Porto Velho. Although Bolsonaro, who was politically right-wing, harshly criticized Castillo's victory in 2021, after the meeting the Brazilian president assured that the differences had been overcome, that what had previously been declared had been forgotten, stating that Castillo was a defender of liberty and "conservative values", and that both countries would work to maintain a good relationship. The foreign ministries of both countries issued a joint statement agreeing to strengthen relations between both nations and reinforce the "strategic alliance".
Sources: en.wikipedia.org
For instance, a high CSI:FingerID score of a hit should increase but never decrease the confidence that the hit is correct. Some features necessitate the existence of at least two candidates for comparison, and separate SVMs are trained for single instances. The decision values of the SVM are mapped to posterior probability estimates using Platt scaling. This comprehensive approach ensures a robust and nuanced assessment of the confidence in molecule identifications.
Carisoprodol, sold under the brand name Soma among others, is an oral medication used for musculoskeletal pain. Effects generally begin within half an hour and last up to six hours. Common side effects include headache, dizziness, and sleepiness. Serious side effects may include addiction, allergic reactions, and seizures. In people with a sulfa allergy certain formulations may cause problems. Safety during pregnancy and breastfeeding is not clear. How it works is not clear. Some of its effects are believed to occur after metabolic conversion into meprobamate, carisoprodol's main active metabolite. Carisoprodol was approved for medical use in the United States in 1959. Its approval in the European Union was withdrawn in 2008. It is available as a generic medication. In 2019, it was the 343rd most commonly prescribed medication in the United States, with more than 800,000 prescriptions. In the United States, it was unscheduled until 2012, when it became a Schedule IV controlled substance.
Thomas A. Wadden (born September 3, 1952) is an American psychologist who is known for his research on the behavioral, pharmacological, and surgical treatment of obesity. He is Professor of Psychology in Psychiatry at the Perelman School of Medicine at the University of Pennsylvania, where he served as Director of the Center for Weight and Eating Disorders for over two decades. From 2011 to 2021, he held the endowed Albert J. Stunkard Professorship in Psychiatry. Wadden has published more than 500 peer-reviewed scientific papers and edited seven volumes on obesity and eating disorders. He has contributed to national health policy on obesity management, serving on expert panels for the National Institutes of Health, the Federal Trade Commission, the Department of Veterans Affairs, and the United States House of Representatives. He is a fellow of The Obesity Society. In 2015, The Obesity Society created the Thomas A. Wadden Award for Distinguished Mentorship, recognizing his education of scientists and practitioners in the field of obesity.
=== Analytical implementations === Surface plasmon resonance can be implemented in analytical instrumentation. SPR instruments consist of a light source, an input scheme, a prism with analyte interface, a detector, and computer. Any quantitative derivation relies on modelling the surface based on the boundary conditions of the Maxwell's equations, for plane films using the Fresnel equations.
=== Canada === Evaporated milk in Canada is defined to be milk from which water has been evaporated and contains at least 25% milk solids and 7.5% milk fat. It may contain added vitamin C if a daily intake of the product contains between 60 and 75 milligrams, and may also contain vitamin D in an amount no less than 300 international units and no more than 400 international units. Disodium phosphate or sodium citrate (or both) may be added, as well as an emulsifying agent.
Sources: en.wikipedia.org
=== Genome === The genome of Pseudomonas aeruginosa consists of a relatively large circular chromosome (5.5–6.8 Mb) that carries between 5,500 and 6,000 open reading frames, and sometimes plasmids of various sizes depending on the strain. Comparison of 389 genomes from different P. aeruginosa strains showed that just 17.5% is shared. This part of the genome is the P. aeruginosa core genome.
This selection influences the flavour of the coffee, as does the digestive process. The beans begin to germinate by malting, which reduces their bitterness. When performed in nature, or in the wild, these two mechanisms achieve the same goal as selective picking and the wet or washed process of coffee milling: 1) harvesting optimally ripe cherries and 2) mechanically and chemically removing the pulp and skin from the cherry, leaving mainly the seed. Traditionally, excreted coffee beans were collected directly in plantations and forests. As the international demand for kopi luwak increased, some producers turned to caged production methods to increase yields. It is produced in Indonesia, East Timor, the Philippines, Thailand, Vietnam and Ethiopia.
Fe2O3 + 2 Al → 2 Fe + Al2O3 Alternatively pig iron may be made into steel (with up to about 2% carbon) or wrought iron (commercially pure iron). Various processes have been used for this, including finery forges, puddling furnaces, Bessemer converters, open hearth furnaces, basic oxygen furnaces, and electric arc furnaces. In all cases, the objective is to oxidize some or all of the carbon, together with other impurities. On the other hand, other metals may be added to make alloy steels.
== History == In 1872, Anders Daae and Christian Horrebow Homann reported an epidemic of pleurodynia occurring in Bamble Municipality in Norway, giving rise to the name "Bamble disease". Subsequent reports, published only in Norwegian, referred to the disease by this name. Niels Ryberg Finsen also described the disease in Iceland in 1874. In 1933, Ejnar Sylvest gave a doctoral thesis describing a Danish outbreak of this disease on Bornholm Island entitled "Bornholm disease-myalgia epidemica", and this name has persisted. In 1949 the Coxsackie B virus was isolated and established as an etiology of Bornholm disease.
By size brevis means short; longus means long; longissimus means longest; magnus means large; major means larger; maximus means largest; minor means smaller, and minimus smallest; latissimus means widest, and vastus means huge. These terms are often used after the particular muscle such as gluteus maximus, and gluteus minimus. By relative shape deltoid means triangular; quadratus means having four sides; rhomboideus means having a rhomboid shape; teres means round or cylindrical, and trapezius means having a trapezoid shape; serratus means saw-toothed; orbicularis means circular; pectinate means comblike; piriformis means pear-shaped; platys means flat and gracilis means slender. Examples are the pronator teres, and the pronator quadratus. By action abductor moving away from the midline; adductor moving towards the midline; depressor moving downwards; elevator moving upwards; flexor moving that decreases an angle; extensor moving in a way that increases an angle or straightens; pronator moving to face down; supinator moving to face upwards; internal rotator rotating towards the body; external rotator rotating away from the body; sphincter decreases the size, and tensor gives tension to; fixator muscles serve to fix a joint in a given position by stabilizing the prime mover whilst other joints are moving. By number of heads biceps two; triceps three and quadriceps four. By location named after the near main structure such as the temporal muscle (temporalis) near to the temporal bone. Also supra- above; infra- below, and sub- under.
Sources: en.wikipedia.org
Anti-doping laboratories typically use LC-MS/MS to detect GW501516 and its metabolites in urine. The method is sensitive and can identify the compound at low concentrations. Detection depends on sample timing, metabolism, and the specific assay.
Legality varies by country and context. It lacks marketing approval as a medicine in major countries. Sports organizations prohibit its use at all times.
A certificate of analysis may report identity, purity, and testing methods for a specific batch. It does not guarantee safety or legal status. Independent verification can confirm whether the material matches the label.
Cardarine is commonly known as GW501516 or GW-1516. These names refer to the same synthetic compound. It is not a brand-name approved medicine.