This is a working overview of PPARδ, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-10-29 and is reviewed periodically as new material appears.
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 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
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.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual description for typical solid reference material. |
| Solubility | Poorly soluble in water; soluble in DMSO | Solubility depends on solvent, purity, and form. |
| Storage | Cool, dry, protected from light | Long-term storage often uses low temperature and desiccant. |
| Common analytical method | LC-MS/MS | Used for detection and quantification in biological matrices. |
| Common synonyms | GW-501516; GW501516; endurobol | Naming varies among literature, vendors, and databases. |
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.
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.
== General references == Acheson, D. J. (1990), Elementary Fluid Dynamics, Oxford Applied Mathematics and Computing Science Series, Oxford University Press, ISBN 978-0-19-859679-0 Batchelor, G. K. (1967), An Introduction to Fluid Dynamics, Cambridge University Press, ISBN 978-0-521-66396-0 Currie, I. G. (1974), Fundamental Mechanics of Fluids, McGraw-Hill, ISBN 978-0-07-015000-3 V. Girault and P. A. Raviart. Finite Element Methods for Navier–Stokes Equations: Theory and Algorithms. Springer Series in Computational Mathematics. Springer-Verlag, 1986 Landau, L. D.; Lifshitz, E. M. (1987), Fluid mechanics, vol. Course of Theoretical Physics Volume 6 (2nd revised ed.), Pergamon Press, ISBN 978-0-08-033932-0, OCLC 15017127 Polyanin, A. D.; Kutepov, A. M.; Vyazmin, A. V.; Kazenin, D. A. (2002), Hydrodynamics, Mass and Heat Transfer in Chemical Engineering, Taylor & Francis, London, ISBN 978-0-415-27237-7 Rhyming, Inge L. (1991), Dynamique des fluides, Presses polytechniques et universitaires romandes Smits, Alexander J. (2014), A Physical Introduction to Fluid Mechanics, Wiley, ISBN 0-47-1253499 Temam, Roger (1984): Navier–Stokes Equations: Theory and Numerical Analysis, ACM Chelsea Publishing, ISBN 978-0-8218-2737-6 Milne-Thomson, L.M., C.B.E (1962), Theoretical Hydrodynamics, Macmillan & Company Limited Tartar, L (2006), An Introduction to Navier Stokes Equation and Oceanography, Springer ISBN 3-540-35743-2 Birkhoff, Garrett (1960), Hydrodynamics, Princeton University Press Campos, D.
Cooper's decision to name his capsule Faith 7 was based on the faith he had in the Atlas booster and Mercury capsule to carry out the mission successfully, although it was reported in The Washington Post that some NASA officials were skeptical of the idea.
== In popular culture == The 1990 film Reversal of Fortune depicts the case and its surrounding fallout. For his portrayal of Claus von Bülow, Jeremy Irons won the Academy Award for Best Actor. Klaus and Sunny Baudelaire from A Series of Unfortunate Events are named after Claus and Sunny von Bülow.
== Early life and education == Bibudhendra Sarkar was born on August 2, 1935, in Kushtia, Bengal, British India (now Bangladesh). His father, Surendra Nath Sarkar, was a lawyer, and his mother, Sucheta Sarkar (née Chaki), a homemaker, died when he was one year old. He completed his kindergarten and primary education at Kushtia Mission School, a Catholic institution. Following the Partition of India in 1947, Sarkar's family relocated to Calcutta after losing their possessions. He attended City College School and later City College, Kolkata, earning his Matriculation and Intermediate Science certifications from the University of Calcutta. He pursued higher education at Banaras Hindu University in Uttar Pradesh, specializing in the chemistry of natural products and earning Bachelor of Pharmacy (B.Pharm) and Master of Pharmacy (M.Pharm) degrees. During his undergraduate studies, Sarkar worked as a summer researcher at the Central Drug Research Institute in Lucknow, under the mentorship of Manojit Mohan Dhar, who encouraged him to pursue graduate studies abroad. He subsequently moved to the United States, completing a PhD in biochemistry at the University of Southern California in 1964 under the supervision of Paul Saltman. At USC, his work was influenced by chemists Sydney Benson (chemical kinetics), Arthur Adamson (physical chemistry), and Bo Malmström (metal-activated enzyme chemistry).
Sources: en.wikipedia.org
== Discovery and naming == The name renin = ren + -in, "kidney" + "compound". The most common pronunciation in English is (long e); (short e) is also common, but using allows one to reserve for rennin. Renin was discovered, characterized, and named in 1898 by Robert Tigerstedt, Professor of Physiology, and his student, Per Bergman, at the Karolinska Institute in Stockholm.
Advertisements were a large influence in the marketable appeal of skin whitening in China and Taiwan. Skincare products that are recognized to protect the skin included chemicals that assist in skin whitening. These products were marketed and promoted as the solution to appearing young forever. Skincare products have been predominantly created to serve as anti-aging to women in China and Taiwan of all ages.
In 1923–24 inventor Harry Grindell Matthews repeatedly claimed to have built a device that projected energy over long ranges and attempted to sell it to the War Office, but it was deemed to be fraudulent. His attempts spurred on many other inventors to contact the British military with claims of having perfected some form of the fabled electric or radio "death ray". Some turned out to be frauds and none turned out to be feasible. Around the same time, a series of stories suggested another radio weapon was being developed in Germany. The stories varied, with one common thread being a death ray, and another that used the signals to interfere with an engine's ignition system to cause the engine to stall. One commonly repeated story involved an English couple who were driving in the Black Forest on holiday and had their car fail in the countryside. They claimed they were approached by soldiers who told them to wait while they conducted a test, and were then able to start their engine without trouble when the test was complete. This was followed shortly thereafter by a story in a German newspaper with an image of a large radio antenna that had been installed on Feldberg in the same area. Although highly skeptical about claims of engine-stopping rays and death rays, the Air Ministry could not ignore them as they were theoretically possible. If such systems could be built, it might render bombers useless. If this were to happen, the night bomber deterrent might evaporate overnight, leaving the UK open to attack by Germany's ever-growing air fleet.
German literature can be traced back to the Middle Ages and the works of writers such as Walther von der Vogelweide and Wolfram von Eschenbach. Well-known German authors include Johann Wolfgang von Goethe, Friedrich Schiller, Gotthold Ephraim Lessing and Theodor Fontane. The collections of folk tales published by the Brothers Grimm popularised German folklore on an international level. The Grimms also gathered and codified regional variants of the German language, grounding their work in historical principles; their Deutsches Wörterbuch, or German Dictionary, sometimes called the Grimm dictionary, was begun in 1838 and the first volumes published in 1854. Influential authors of the 20th century include Gerhart Hauptmann, Thomas Mann, Hermann Hesse, Heinrich Böll, and Günter Grass. The German book market is the third-largest in the world, after the United States and China. The Frankfurt Book Fair is the most important in the world for international deals and trading, with a tradition spanning over 500 years. The Leipzig Book Fair also retains a major position in Europe.
=== Drug interactions === Flucloxacillin can reduce the excretion of methotrexate, potentially resulting in a risk of methotrexate toxicity. The level of flucloxacillin in the blood may rise in kidney failure and with the use of probenecid.
Sources: en.wikipedia.org
Genomic Technologies, Inc. was one of the few companies to develop a large scale oligonucleotide synthesizer that was, from the ground up, an oligonucleotide synthesizer. The initial platform called the VLSS for very large scale synthesizer utilized large Pharmacia liquid chromatograph columns as reactors and could synthesize up to 75 mmol of material. Many oligonucleotide synthesis factories designed and manufactured their own custom platforms and little is known due to the designs being proprietary. The VLSS design continued to be refined and is continued in the QMaster synthesizer which is a scaled down platform providing milligram to gram amounts of synthetic oligonucleotide. The current practices of synthesis of chemically modified oligonucleotides on large scale have been recently reviewed.
Milnacipran is structurally different from other SNRIs. The structure activity relationship of milnacipran derivatives at the transporter level is still largely unclear and is based on in vivo efficacy that was reported in 1987. N-methylation of milnacipran in substituent group R4 and R5 reduces the norepinephrine and serotonin activity. Researches on different secondary amides in substitution groups R6 and R7 showed that π electrons play an important role in the interaction between transporters and ligands. A phenyl group in substituent R6 showed effect on norepinephrine transporters. Substituent groups in R6 and R7 with allylic double bond showed significant improved effect on both norepinephrine and serotonin transporters. Studies show that introducing a 2-methyl group in substituent R3, the potency at norepinephrine and serotonin transporters are almost abolished. Methyl groups in substituent groups R1 and R2 also abolish the potency at norepinephrine and serotonin transporters. Researchers found that replacing one of the ethyl groups of milnacipran with an allyl moiety increases the norepinephrine potency. The pharmacophore of milnacipran derivatives is still largely unclear. The conformation of milnacipran is an important part of its pharmacophore. Changing its stereochemistry affects the norepinephrine and serotonin concentration. Milnacipran is marketed as a racemic mixture. Effects of milnacipran reside in the (1S,2R)-isomer and substitution of the phenyl group in the (1S,2R)-isomer has negative impact on norepinephrine concentration.
=== Availability === Conventional oral selegiline (brand names Eldepryl, Jumex) is widely marketed throughout the world, including in over 70 countries. Conversely, the selegiline transdermal patch (brand name Emsam) is only marketed in the United States, while the selegiline orally disintegrating tablet (brand name Zelapar) is marketed in the United States, the United Kingdom, and the European Union.
is the momentum, and Q is the Q value of the decay. The kinetic energy of the emitted neutrino is given approximately by Q minus the kinetic energy of the beta. As an example, the beta decay spectrum of 210Bi (originally called RaE) is shown to the right.
Sources: en.wikipedia.org
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.
Most methods use liquid chromatography with tandem mass spectrometry. Urine is common in anti-doping testing, and blood or plasma may be used in research.
Typical guidance is cool, dry, dark storage, often at low temperature and with desiccant. Stability data are limited, so storage conditions should be verified for each batch or supplier.
It targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not act primarily on androgen receptors. This distinction separates it from SARMs.