PPARδ agonist raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-12-05. Anything still debated is marked as such rather than presented as settled.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
Activation of PPARδ changes transcription of genes involved in fatty acid transport, mitochondrial function, and skeletal muscle fuel preference. In rodent studies, pharmacological PPARδ activation was associated with increased endurance and altered body composition. These findings generated interest in performance enhancement, but species differences and study designs limit direct extrapolation to humans. Small human trials were conducted in the 2000s and later discontinued. The extent to which cardarine produces similar metabolic or performance effects in people remains an open question.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic PPARδ agonist | Not a steroid or a selective androgen receptor modulator. |
| Common synonyms | Cardarine, GW501516, GW-501516, endurobol | Names vary by supplier and literature source. |
| Appearance | White to off-white powder | Consistent with many small-molecule research chemicals. |
| Solubility | Low in water; soluble in DMSO and ethanol | Often prepared in organic solvent for laboratory work. |
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid and energy metabolism. |
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.
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.
==== Cardiovascular ==== Methamphetamine is a sympathomimetic drug that causes vasoconstriction and tachycardia. Methamphetamine also promotes abnormal extra heartbeats and irregular heart rhythms, which may be life-threatening.
27 April An estimated battalion of PAVN assaulted a night defensive position of a unit of the 2nd Brigade, 25th Infantry Division 10 km northeast of Trảng Bàng. The attack was repulsed with 100 PAVN/VC killed and one captured and 32 individual and 23 crew-served weapons captured; U.S. losses were ten killed. A grass fire spread to the Marines/Navy ammunition supply point 1 near Hill 327 causing a massive explosion and fire.
=== Cost considerations === As of 2018, the Illumina monopoly on high-quality next-generation sequencing reagents has meant that the sequencing reagents alone cost more than FDA-approved syndromic testing panels. Also additional direct costs of metagenomics such as extraction, library preparation, and computational analysis have to be considered. In general, metagenomic sequencing is most useful and cost efficient for pathogen discovery when at least one of the following criteria are met:
=== Acid derivatives === The formation of amide is promoted by CDI. Although the reactivity of CDI is less than acid chlorides, it is more easily handled and avoids the use of thionyl chloride in acid chloride formation, which can cause side reactions. An early application of this type of reaction was noted in the formation of peptide bonds (with CO2 formation as a driving force). The proposed mechanism for the reaction between a carboxylic acid and CDI is presented below.
Sources: en.wikipedia.org
== Historian of Alltagsgeschichte in the Third Reich == Peukert was a leading expert in Alltagsgeschichte ("history of everyday life") and his work often examined the effect of Nazi social policies on ordinary Germans and on persecuted groups such as Jews and Roma. The subject of Alltagsgeschichte had first been established as a subject in the 1970s, and had first attracted attention when Martin Broszat and his protégés launched the "Bavaria project" in 1973, intended to document everyday life in Bavaria in the Third Reich. Broszat had begun the study of Alltagsgeschichte in the early 1970s with two goals. The first was to counter what Broszat considered to be the excessively "from above" high politics approach to writing about Nazi Germany which largely saw the story of the Third Reich by looking at the actions of Hitler and the rest of the Nazi elite and treating almost everybody else in Germany as merely passive objects controlled and manipulated by the state. Broszat wanted to treat the German people as subjects in their own lives during the Nazi era, making choices in their everyday lives, both for good and ill, albeit within a reduced range. The second goal of Broszat with Alltagsgeschichte was to end the "monumentalization" of the men involved in the 20 July plot in 1944, with Broszat complaining treated the story of resistance in Nazi Germany as one of few conservatives from the traditional elites in the aristocracy, the military, the bureaucracy, and the diplomatic corps struggling to overthrow the Nazi regime.
Singapore has conscription for all able-bodied males at age 18, except those with a criminal record or who can prove that their loss would bring hardship to their families. Males who have yet to complete pre-university education, are awarded the Public Service Commission (PSC) scholarship, or are pursuing a local medical degree can opt to defer their draft. Though not required to perform military service, the number of women in the SAF has been increasing: since 1989 they have been allowed to fill military vocations formerly reserved for men. Before induction into a specific branch of the armed forces, recruits undergo at least nine weeks of basic military training. Because of the scarcity of open land on the main island, training involving activities such as live firing and amphibious warfare are often carried out on smaller islands, typically barred to civilian access. However, large-scale drills, considered too dangerous to be performed in the country, have been performed in other countries such as Brunei, Indonesia, Thailand and the United States. In general, military exercises are held with foreign forces once or twice per week. Due to airspace and land constraints, the Republic of Singapore Air Force (RSAF) maintains a number of overseas bases in Australia, the United States, and France. The RSAF's 130 Squadron is based in RAAF Base Pearce, Western Australia, and its 126 Squadron is based in the Oakey Army Aviation Centre, Queensland. The RSAF has one squadron—the 150 Squadron—based in Cazaux Air Base in southern France.
== Contraindications == Methylergometrine is contraindicated in patients with hypertension and pre-eclampsia. It is also contraindicated in HIV positive patients taking protease inhibitors, delavirdine, and efavirenz (which is also an agonist at the 5-HT2A–mGlu2 receptor protomer and increases the chances of a patient experiencing hallucinations during methylergometrine therapy).
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist. It is not a steroid or a selective androgen receptor modulator. It was developed and studied as a research compound for metabolic pathways.
It binds to and activates PPARδ, a nuclear receptor that regulates genes related to fatty acid oxidation and energy use. This activation alters transcription in tissues such as skeletal muscle and liver. The full range of downstream effects in humans is not fully established.
No, cardarine is not known to occur naturally in plants, animals, or humans. It is a synthetic molecule produced for laboratory research. Products labeled as cardarine should therefore be treated as manufactured chemicals with variable purity.
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.