This is a working overview of PPARδ agonist, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-10-23. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white solid | Typical form of reference material |
| Solubility | Low in water; soluble in DMSO | Used to prepare stock solutions |
| Typical storage | -20 °C, desiccated, protected from light | Common laboratory practice |
| Analytical method | LC-MS/MS | Detects parent compound and metabolites |
| Common test matrix | Urine or blood | Used in anti-doping analysis |
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.
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.
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.
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.
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.
, the spreading slows down thus useful to set a prediction on the short-term trends. Also, it can be used to directly calculate the threshold population of vaccination/immunization for the herd immunity stage by setting
Speaker of the House – Gerry Brownlee Prime Minister – Christopher Luxon Deputy Prime Minister – Winston Peters until 31 May, and then David Seymour Leader of the House – Chris Bishop Minister of Finance – Nicola Willis Minister of Foreign Affairs – Winston Peters
Conduction velocity The speed at which an action potential travels along a nerve fiber. It is influenced by factors such as axon diameter and myelination. Consciousness A state of awareness of self and the environment. In neuroscience, it involves the coordinated activity of multiple brain regions, particularly the thalamocortical system. Corpus callosum The largest white matter structure in the brain, consisting of a thick band of axons that connects the left and right cerebral hemispheres. Cortical column A vertically organized group of neurons in the cerebral cortex that processes the same type of information, such as orientation or location in space. It is a basic functional unit of the cortex. Cortical plasticity The ability of the cerebral cortex to adapt and reorganize in response to experience, learning, or injury. Corticospinal tract A major descending pathway from the motor cortex to the spinal cord that mediates voluntary motor control, especially fine movements of the limbs. Creutzfeldt–Jakob disease (CJD) A rare and fatal neurodegenerative disorder caused by misfolded prion proteins. It leads to rapid cognitive decline, motor dysfunction, and ultimately death. Critical period A developmental window during which the nervous system is particularly sensitive to certain environmental stimuli, crucial for proper development of functions such as vision and language. Cross modal plasticity The ability of one sensory modality to reorganize and compensate in another’s absence (e.g., visual cortex being recruited for touch in individuals who are blind).
The Federal Republic of Germany is a federation and consists of sixteen partly sovereign "states" (German: Länder, sing. Land). Of the 16 states, 13 are so-called "area-states" (Flächenländer); in these, below the level of the state government, there is a division into local authorities (counties and county-level cities) that have their own administration. Two states, Berlin and Hamburg, are city-states, in which there is no separation between state government and local administration. The state of Bremen is a special case: the state consists of the cities of Bremen, for which the state government also serves as the municipal administration, and Bremerhaven, which has its own local administration separate from the state government. It is therefore a mixture of a city-state and an area-state. Three states, Bavaria, Saxony, and Thuringia, use the appellation Freistaat ("free state"); this title is merely stylistic and carries no legal or political significance (similar to the US states that call themselves a commonwealth). The Federal Republic of Germany ("West Germany") was created in 1949 through the unification of the three western zones previously under American, British, and French administration in the aftermath of World War II. Initially, the states of the Federal Republic were Baden (until 1952), Bavaria (Bayern), Bremen, Hamburg, Hesse (Hessen), Lower Saxony (Niedersachsen), North Rhine-Westphalia (Nordrhein-Westfalen), Rhineland-Palatinate (Rheinland-Pfalz), Schleswig-Holstein, Württemberg-Baden (until 1952), and Württemberg-Hohenzollern (until 1952).
Sources: en.wikipedia.org
5-HT2 receptors are G protein-coupled receptors that can regulate cellular signaling in the absence of a ligand. This can be explained by a two-state model (Figure 2) where the receptor is in equilibrium between two states, an active state (R*) and an inactive state (R). Basal effector activity is defined, in part, by the absolute level of (R*), which will increase along with increasing receptor density. Ligands that preferentially bind to and stabilize the R state are termed inverse agonists and reduce the effector activity. Agonists preferentially bind to and stabilize the R* state, thereby increasing effector activity. Neutral antagonists show equal affinity for both conformations and do not alter the equilibrium between the two states, however they occupy the receptor and can block the effect of both agonists and inverse agonists. 5-HT2C and 5-HT2A receptors have a similar amino acid sequence homology, with ~50% overall sequence identity and ~80% within the TM domains, resulting in a similar pharmacological profile for the two receptors. Both receptors couple the same cellular signal transduction pathways, PLC and PLA2, that lead to an accumulation of inositol phosphate and Ca2+ within the postsynaptic cell. The 5-HT2C receptors are the only G-protein coupled receptors known to undergo a post-transcriptional process of RNA editing. The 5-HT2C receptor gene is found on the X-chromosome, Xq24. This gene product undergoes an RNA editing process leading to a decrease in agonist binding affinity, however antagonist binding remains unaltered.
In patients with non-severe asymptomatic aortic valve stenosis, increased age- and sex adjusted N-terminal pro-brain natriuretic peptide (NT-proBNP) levels alone and combined with a 50% or greater increase from baseline had been found associated with increased event rates of aortic valve stenosis related events (cardiovascular death, hospitalization with heart failure due to progression of aortic valve stenosis, or aortic valve replacement surgery). In patients with non-severe asymptomatic aortic valve stenosis and no overt coronary artery disease, the increased troponin T (above 14 pg/mL) was found associated with an increased 5-year event rate of ischemic cardiac events (myocardial infarction, percutaneous coronary intervention, or coronary artery bypass surgery).
==== Reservation reconstituted ==== On July 9, 2020, the United States Supreme Court ruled in a 5–4 decision that the original treaties, and promise of a reservation, with the Five Civilized Tribes (specifically the Muscogee in McGirt v. Oklahoma) were never withdrawn. This decision allowed for the restoration of the reservation status of the Cherokee Nation in a later decision. The majority opinion was held by justices Sonia Sotomayor, Ruth Bader Ginsburg, Elena Kagan, Stephen Breyer, and Neil Gorsuch. Hogner v. Oklahoma was decided on March 11, 2021, in Oklahoma Courts and found that the Cherokee Nation "reservation was established and had never been disestablished." Cherokee Nation Principal Chief Chuck Hoskin, Jr. said: "We have long held that Cherokee Nation has a reservation, rooted in our treaties, as the Supreme Court of the United States has now affirmed" and "This proposed legislation will cement our reservation boundaries and the broad tribal jurisdiction the Supreme Court recognized in the McGirt decision. We will continue to work with the state of Oklahoma and our federal partners to ensure the safety of the public." The United Keetoowah Band of Cherokee Indians claims it has rights to the reservation as well as a "successor in interest" because they contend the original Cherokee Nation was "sunset" after "the last of its original members who signed the Dawes Roll died in 2012 at age 107." Therefore, the current Cherokee Nation is no longer the same Cherokee Nation that made the agreements with the federal government, it is only a "successor" like the UKB.
=== Capital increase and IPO === In October 2018, Dutch Bros received an undisclosed amount from private equity firm TSG Consumer Partners for a minority stake in the company and announced plans to expand to 800 stores over the next five years. Dutch Bros reported revenues of $238 million in 2019, $327.4 million in 2020, and $228 million over the first six months of 2021, heading into the company formally filing for its initial public offering (IPO) in August 2021. The company stated in its filing that it hoped to raise $100 million, which it would use toward paying down $192 million in long-term debt. Dutch Bros held its IPO and began trading on the New York Stock Exchange with the ticker symbol "BROS" on September 15, 2021. The IPO raised $484 million, selling about 21 million shares for $23 each. Travis Boersma retained about 74% of shareholder voting power after the listing, due to his ownership of class B stock before he sold his stake in November 2025.
==== Infections: HIV-AIDS, measles, RSV, others ==== The role of SP in HIV-AIDS has been well-documented. Doses of aprepitant greater than those tested to date are required for demonstration of full efficacy. Respiratory syncytial and related viruses appear to upregulate SP receptors, and rat studies suggest that NK1RAs may be useful in treating or limiting long term sequelae from such infections. Entamoeba histolytica is a unicellular parasitic protozoan that infects the lower gastrointestinal tract of humans. The symptoms of infection are diarrhea, constipation, and abdominal pain. This protozoan was found to secrete serotonin as well as Substance P and neurotensin.
Sources: en.wikipedia.org
Anti-doping and clinical laboratories commonly use liquid chromatography-tandem mass spectrometry. The method can identify GW501516 and its metabolites in urine or blood. Detection depends on sample timing and the amount present.
PPARδ is a nuclear receptor that regulates genes linked to fatty acid oxidation and energy metabolism. Activation can alter lipid handling and energy use in experimental models. The full range of effects in humans is still under study.
The solid compound is generally stable when kept cold, dry, and protected from light. Solutions may degrade faster, so laboratory protocols often specify fresh preparation or cold storage. Stability can depend on solvent, concentration, and container.
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.