A practical reference on PPAR delta: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-02-26 and is reviewed periodically as new material appears.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid metabolism |
| Preclinical effect | Increased fatty acid oxidation | Observed in rodent studies |
| Key safety signal | Tumors in rodents after long-term exposure | Contributed to halted clinical development |
| Human trial status | No approved product; development stopped | Limited short-term metabolic data |
| Sport regulatory status | Prohibited at all times | WADA hormone and metabolic modulators class |
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.
GW501516 acts as a ligand for PPAR delta, a nuclear receptor that regulates transcription of genes involved in fatty acid oxidation and energy use. Activation of this receptor in skeletal muscle shifts metabolism toward fat burning in animal models. The compound does not burn fat directly; it changes gene expression over hours to days. Researchers study it to understand metabolic flexibility and exercise adaptation. Effects observed in rodents are not automatically expected in humans.
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.
== Education == Gokhan Okan was born on 2 March 1972 in Istanbul. He earned his medical degree from the Istanbul University Cerrahpasa faculty of medicine in 1994. He completed his dermatology residency in 1998 at Istanbul University Istanbul Medical Faculty.
== Humanities == In philosophy, the end result of a dialectic as in thesis, antithesis, synthesis A cognitive skill in Benjamin Bloom's Taxonomy of Educational Objectives In philosophy and cognitive science, a foundational a priori process In linguistics, a scale denoting the average ratio of morphemes to words; see synthetic language In legal theory, the process of condensing and combining large quantities of information
=== PVP/PVA hydrogels for articular cartilage replacement === Poly(vinyl alcohol) (PVA) hydrogels were used in this study. It was difficult to meet the mechanical properties of articular cartilage using this hydrogel. There was no inflammatory or degenerative changes in articular cartilage or synovial membrane surround this artificial PVA cartilage. PVP hydrogels were also studied. They exhibit high hydrophilicity, biocompatibility, and complexing ability. When used as a blend of PVA/PVP hydrogel, they produced similar internal 3D structure and water content as natural articular cartilage. The best mechanical properties and friction system were blended hydrogel with 1 wt. % PVP. Due to the greater inter-chain hydrogen bonding, adding PVP to the pure PVA proved a better option. They acted exactly with a characteristic viscoelastic behavior of articular cartilage.
Sources: en.wikipedia.org
1946: Shimpei Fukuye, who killed four prisoners of war during the Selarang Barracks incident, was executed on 27 April 1946. 1947: Oishi Masayuki, commander of the 2nd Field Kempeitai, and Kawamura Saburo, commander of the Syonan Defence Garrison. Both men were sentenced to death in 1947 for initiating the Sook Ching massacre, and executed the same year. Lieutenant-Colonel Sumida Haruzo, Warrant Officer Monai Tadamori, Sergeant Major Makizono Masuo, Sergeant Major Terada Takao, Sergeant Nozawa Toichiro, Sergeant Major Tsujio Shigeo, Sergeant Major Morita Shozo and army interpreter Toh Swee Koon, the eight defendants who were sentenced to death after their conviction for war crimes at the 1946 Double Tenth incident trial.
In 2018, the International Union for Conservation of Nature (IUCN) assessed the white shark as vulnerable worldwide, citing a population decline of 30–49% since approximately 1859. The species was further described as "moderately depleted" in 2021. The biggest threats to white sharks are accidental catching in fishing nets and the use of shark control measures—such as nets and traps—near beaches in Australia and South Africa. They nevertheless maintain a high survival rate when released from such gear. To regulate international trade, the species is listed under CITES Appendix II, requiring permits for the exchange of any specimens or parts. While a 2025 study estimated the global population at a minimum of roughly 5,800 individuals, co-author Gavin Naylor suggests the actual figure may be closer to 20,000.
Without treatment, physical deformities occur in 10% of cases. Yaws is common in at least 13 tropical countries as of 2012. Almost 85% of infections occurred in three countries—Ghana, Papua New Guinea, and Solomon Islands. The disease only infects humans. Efforts in the 1950s and 1960s by the World Health Organization decreased the number of cases by 95%. Since then, cases have increased, but with renewed efforts to globally eradicate the disease by 2020. In 1995, the number of people infected was estimated at more than 500,000. In 2016, the number of reported cases was 59,000. Although one of the first descriptions of the disease was made in 1679 by Willem Piso, archaeological evidence suggests that yaws may have been present among human ancestors as far back as 1.6 million years ago.
Modern food processing technology developed in the 19th and 20th centuries was developed in a large part to serve military needs. In 1809, Nicolas Appert invented a hermetic bottling technique that would preserve food for French troops which ultimately contributed to the development of tinning, and subsequently canning by Peter Durand in 1810. Although initially expensive and somewhat hazardous due to the lead used in cans, canned goods would later become a staple around the world. Pasteurization, discovered by Louis Pasteur in 1864, improved the quality and safety of preserved foods and introduced the wine, beer, and milk preservation. During the late nineteenth and early twentieth centuries, synthetic dyes began being used in food production to enhance or standardize the color of food products such as butter and processed goods. This reflected broad industrial efforts to control the appearance of consumer products.
Sources: en.wikipedia.org
Vegetable oils such as castor oil are typically unattractive alternatives to petroleum-derived lubricants because of their poor oxidative stability. Castor oil has better low-temperature viscosity properties and high-temperature lubrication than most vegetable oils, making it useful as a lubricant in jet, diesel, and racing engines. The viscosity of castor oil at 10 °C (50 °F) is 2,420 centipoise, but it tends to form gums in a short time, so its usefulness is limited to engines that are regularly rebuilt, such as racing engines. Lubricant company Castrol took its name from castor oil. Castor oil has been suggested as a lubricant for bicycle pumps because it does not degrade natural rubber seals.
=== Pharmacodynamics === Diazoxide acts as a ATP-sensitive potassium channel (KATP) opener. It has been found to act as a positive allosteric modulator of the ionotropic glutamate AMPA and kainate receptors.
The gameplay involves capturing or defending Hybrid NPCs across four maps, incorporating mechanics inspired by Counter-Strike and Vampire Slayer. Vampire Slayer – is a teamplay mod where two sides: vampires and slayers, battle it out in a variety of atmospheric settings. Planet Half-Life called the original release "A great mod". They also reviewed Chapter IV and wrote: "The new maps fit perfectly with the atmosphere built up from the previous releases." PC Zone gave version 1.1 a rating of three out of five, Chapter III a rating of 69%, and Chapter V a rating of 91%. War in Europe – A World War II-themed mod released in 1999 that includes deathmatch, team deathmatch, and capture the flag. The player earns "promotions" by fragging, which allows purchasing of additional weapons. If the player takes a hit, they will start to bleed, which can be treated with a medkit. PC Gameplay reviewed the game in 2001 and gave a rating of six out of ten, calling it worse than Day of Defeat. Wasteland Half-Life – A post-apocalyptic-themed mod with modes for deathmatch, team deathmatch, and objective capture. PC Zone gave it a score of four out of five and said it's not as popular as it deserves to be. .NetGamer said that despite the familiar gameplay, the mod has a top-notch technical execution. They also praised the maps and the character models. Later, an updated version of the mod was released, titled The Wastes. PC Zone gave it a score 69 out of 100 and called it a worthwhile update.
Sources: en.wikipedia.org
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.
Small short-term human trials examined metabolic markers such as lipids and glucose. The trials did not continue after rodent cancer findings, so long-term human safety is unknown.
Controlled human trials have not established a performance benefit. Anecdotal reports exist, but they are not reliable evidence.
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.