If you have been reading about PPAR delta and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-05-09. Where a claim depends on a specific study, the study is described rather than over-claimed.
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
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.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516, GW-501516, GW 501516, endurobol | Names vary in research and anti-doping documents. |
| Chemical class | Synthetic PPARδ agonist | Small-molecule nuclear receptor ligand. |
| CAS Registry Number | 317318-70-0 | Identifier commonly associated with GW501516. |
| Appearance | White to off-white powder | Typical for purified research material. |
| Solubility | Low in water; soluble in DMSO and ethanol | Organic solvents are common for laboratory stock solutions. |
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.
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.
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.
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.
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.
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.
A critical requirement in food packaging is represented by the barrier properties against the permeation of gases, water vapor, and aroma compounds of the packaging system. In fact, the chemical interactions between the products and the environment are the principal reasons for improper shelf-life and spoilage phenomena. Therefore, the evaluation of the gas exchange by means of the permeation of gas molecules is a crucial aspect in designing a product. The permeation of a gas molecule through a packaging system is a physical process made up of three independent phenomena: the adsorption of the molecule to the packaging's outer surface; the diffusion of the molecule through the packaging's section; and the desorption in the internal headspace. Under the assumption of steady state conditions, the physical processes involved in the permeation can be modeled by simple equations. Particularly, the diffusion of a permeant's molecule is dependent to the concentration difference between the two sides of the packaging system, which acts as a driving force, thus creating a diffusive flux following the first Fick's law of diffusion. Furthermore, other assumptions are needed, such as the absence of chemical interaction between the penetrant and the packaging material and the fact that the diffusion flow must follow only one direction.
The Indian Plate survives as peninsular India, the oldest and geologically most stable part of the country. It extends as far north as the Satpura and Vindhya ranges in central India. These parallel chains run from the Arabian Sea coast in Gujarat in the west to the coal-rich Chota Nagpur Plateau in Jharkhand in the east. To the south, the peninsular landmass, the Deccan Plateau, is flanked on the west and east by coastal ranges known as Western and Eastern Ghats; the plateau contains the country's oldest rock formations, some over one billion years old. Geographically, India lies to the north of the equator between 6° 44′ and 35° 30′ north latitude and 68° 7′ and 97° 25′ east longitude. Major Himalayan-origin rivers that substantially flow through India include the Ganges and the Brahmaputra, both of which drain into the Bay of Bengal. Important tributaries of the Ganges include the Yamuna and the Kosi. The Kosi's extremely low gradient, caused by long-term silt deposition, leads to severe floods and course changes. Major peninsular rivers, whose steeper gradients prevent extensive flooding, include the Godavari, the Mahanadi, the Kaveri, and the Krishna, which also drain into the Bay of Bengal; and the Narmada and the Tapti, which drain into the Arabian Sea. India's coastline measures 7,517 kilometres (4,700 mi) in length; of this distance, 5,423 kilometres (3,400 mi) belong to peninsular India and 2,094 kilometres (1,300 mi) to the Andaman, Nicobar, and Lakshadweep island chains.
==== Grafting ==== In biotextiles, grafting onto surfaces refers to the process of attaching or bonding functional molecules, such as proteins, peptides, or polymers, onto the surface of textile materials. This process is often performed to modify the surface properties of textiles, such as enhancing biocompatibility, promoting cell adhesion, or enabling controlled drug release. Grafting onto surfaces can be achieved through various techniques, including chemical modification, plasma treatment, or surface coating methods. These modified biotextiles find applications in biomedical fields such as tissue engineering, wound healing, and medical implants, where tailored surface properties are critical for desired biological interactions.
== History == The programme originated in response to protests by dairy farmers in 1984 over surplus unsold milk. To address the issue, the Thai Cabinet established the National Milk Drinking Campaign Board in 1985 and launched a pilot project in Bangkok and Chiang Mai that offered milk at subsidized rates to parents of schoolchildren. Following the success of the pilot, the government introduced a nationwide programme in 1992 to distribute free milk to public schools. The programme significantly contributed to the growth of Thailand’s dairy sector. Annual milk production rose from approximately 290 million litres in the early 1990s to more than 1.1 billion litres by 2003, while per capita milk consumption increased from about 2 litres in 1984 to over 23 litres in 2002. Between 2009 and 2018, competition for milk supply quotas led to various administrative and quality concerns, including reports of spoiled milk and inefficient distribution. In 2019, reforms were introduced to improve transparency and re-establish clear quota zones for suppliers.
Sources: en.wikipedia.org
== NIH deputy intramural directors == G. Burroughs Mider, July 1, 1960-May 19, 1968 Joseph Edward Rall, June 1983-May 1991 Lance Liotta, July 6, 1992-August 1993 Michael M. Gottesman, November 1993-July 31, 2022 Nina F. Schor, 2022-present
These early structural studies were not followed up until recent years with the renewed interest in bottromycin. The structure was confirmed in the 1980s and 1990s to be a cyclic iminopeptide based on NMR studies, with a linear side chain connected to the macrocycle via an amidine linkage. Its absolute stereochemistry, however, was not characterized until 2009. Stereochemistry at carbon 18 and 25 was proposed by comparing predicted conformers obtained using molecular dynamics to experimental constraints obtained through NMR experiments. Stereochemistry at carbon 43 was confirmed by comparing 1H NMR of authentic hydrolysis product to a chemically synthesized sample of the same fragment. Finally, optical rotation, 1H NMR, and HRMS experiments of chemically synthesized bottromycin matched that of biologically produced bottromycin. The three-dimensional solution structure of bottromycin A2 was solved by NMR in 2012. The overall structure was obtained with good resolution (RMSD 0.74±0.59 Å), with a RMSD of 0.09±0.06 Å for the macrocycle. In this study, it was proposed that the methylated proline residue contributed to the restricted conformation of the macrocycle. The methylated proline and β-OMe alanine residues were found to be on the same face of bottroymycin A2 and it was suggested that this characteristic contributed to binding of bottromycin to the ribosomal A site.
Etorphine (M99) is a semi-synthetic opioid possessing an analgesic potency approximately 1,000–3,000 times that of morphine. It was first prepared in 1960 from oripavine, which does not generally occur in opium poppy extract but rather the related plants Papaver orientale and Papaver bracteatum. It was reproduced in 1963 by a research group at MacFarlan Smith in Edinburgh, led by Kenneth Bentley. It can be produced from thebaine.
The territory was subsequently claimed and settled by Portugal, which founded the country's first city, São Vicente, in 1532 and imported enslaved Africans to work on plantations. Brazil remained a colony until 1815, when it was elevated to a united kingdom with Portugal after the transfer of the Portuguese court to Rio de Janeiro. Prince Pedro of Braganza declared Brazilian independence in 1822 and, after waging a war against Portugal, established the Empire of Brazil. The country's first constitution in 1824 established a bicameral legislature and enshrined principles such as freedom of religion and the press; slavery was gradually abolished until its final abolition in 1888. Brazil became a presidential republic following a military coup d'état in 1889. An armed revolution in 1930 ended the First Republic and brought Getúlio Vargas to power. Vargas' self-coup in 1937 ushered the authoritarian Estado Novo, in which he oversaw Brazil's involvement in World War II. Democracy was restored after Vargas' ousting in 1945. An authoritarian military dictatorship emerged in 1964 with support from the United States and ruled until 1985, after which civilian governance resumed. Brazil's current constitution, enacted in 1988, defines it as a democratic federal republic. Brazil is a regional and middle power, and has been described as a rising global power.
Humans cannot catch warts from toads or other animals; the bumps on a toad are not warts. Warts on human skin are caused by human papillomavirus, which is known to affect only humans. Cracking one's knuckles does not cause osteoarthritis. In people with eczema, bathing does not dry the skin as long as a moisturizer is applied soon after. If moisturizer is not applied after bathing, then the evaporation of water from the skin can result in dryness. There have never been any programs in the US that provide access to dialysis machines in exchange for pull tabs on beverage cans. This rumor has existed since at least the 1970s, and usually cites the National Kidney Foundation as the organization offering the program. The Foundation itself has denied the rumor, noting that dialysis machines are primarily funded by Medicare. Rhinoceros horn in powdered form is not used as an aphrodisiac in traditional Chinese medicine as Cornu Rhinoceri Asiatici (犀角, xījiǎo, "rhinoceros horn"). It is prescribed for fevers and convulsions, a treatment not supported by evidence-based medicine. Leprosy is not auto-degenerative as commonly supposed, meaning that it will not (on its own) cause body parts to be damaged or fall off. Leprosy causes rashes to form and may degrade cartilage and, if untreated, inflame tissue. In addition, leprosy is only mildly contagious, partly because 95% of those infected with the mycobacteria that cause leprosy do not develop the disease.
Sources: en.wikipedia.org
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.
No. Cardarine is not a steroid hormone; it targets the nuclear receptor PPARδ. Its classification in anti-doping rules differs from anabolic steroids, though it remains prohibited in sport.
Early rodent studies reported tumor formation at multiple sites, which raised safety concerns. Sponsors stopped clinical development, and no approved human product exists.
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.