This is a working overview of fatty acid oxidation, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-03-08. Anything still debated is marked as such rather than presented as settled.
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.
PPARδ is a nuclear receptor that regulates gene expression related to fatty acid oxidation, glucose homeostasis, and mitochondrial function. GW501516 binds to this receptor with high affinity and activates downstream signaling in skeletal muscle and other tissues. Animal studies reported increased endurance and altered fuel preference, but human data remain limited and inconsistent. The precise relationship between receptor activation and observed physiological changes is still an area of active investigation. Researchers have also examined whether the compound affects inflammation or cell proliferation. No approved therapeutic indication exists for cardarine.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| CAS Registry Number | 317318-70-0 | Unique identifier for the compound. |
| Chemical class | PPARδ agonist | Synthetic ligand for peroxisome proliferator-activated receptor delta. |
| Appearance | White to off-white solid | Typical form of research-grade material. |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water. |
| Typical storage | -20°C | Recommended for long-term storage of stock solutions. |
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.
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.
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
Inlet: a substrate (typically cellulose) where liquids are dispensed manually. Channels: hydrophilic sub-millimeter networks that guide liquid throughout a device. Flow amplifiers: regions of varying geometry where the flow velocity is modified to impart a steady state flow of controllable velocity Flow resistors: a capillary element used to impart a reduced flow velocity in order to control the residence time of a fluid in a microfluidic device Barriers: hydrophobic regions that prevent fluid from leaving the channel. Outlets: location where a chemical or biochemical reaction takes place.
== Toxicity and harm potential == NBOMe compounds are often associated with life-threatening toxicity and death. Studies on NBOMe family of compounds demonstrated that the substances exhibit neurotoxic and cardiotoxic activity. Reports of autonomic dysfunction remains prevalent with NBOMe compounds, with most individuals experiencing sympathomimetic toxicity such as vasoconstriction, hypertension and tachycardia in addition to hallucinations. Other symptoms of toxidrome include agitation or aggression, seizure, hyperthermia, diaphoresis, hypertonia, rhabdomyolysis, and death. Researchers report that NBOMe intoxication frequently display signs of serotonin syndrome. The likelihood of seizure is higher in NBOMes compared to other psychedelics. NBOMe and NBOHs are regularly sold as LSD in blotter papers, which have a bitter taste and different safety profiles. Despite high potency, recreational doses of LSD have only produced low incidents of acute toxicity. Fatalities involved in NBOMe intoxication suggest that a significant number of individuals ingested the substance which they believed was LSD, and researchers report that "users familiar with LSD may have a false sense of security when ingesting NBOMe inadvertently". While most fatalities are due to the physical effects of the drug, there have also been reports of death due to self-harm and suicide under the influence of the substance. Given limited documentation of NBOMe consumption, the long-term effects of the substance remain unknown. NBOMe compounds are not active orally, and are usually taken sublingually.
These early experiments with animal blood provoked a heated controversy in Britain and France. Finally, in 1668, the Royal Society and the French government both banned the procedure. The Vatican condemned these experiments in 1670. Blood transfusions fell into obscurity for the next 150 years.
=== History === Fu, Jia-Chen; King, Michelle; Klein, Jakob, eds. (2025). Modern Chinese Foodways. MIT Press. ISBN 9780262381642. Chang, Kwang-chih (1977). Food in Chinese Culture: Anthropological and Historical Perspectives. New Haven: Yale University Press. ISBN 0300019386. David R. Knechtges, "A Literary Feast: Food in Early Chinese Literature," Journal of the American Oriental Society 106.1 (1986): 49–63. Newman, Jacqueline M. (2004). Food Culture in China. Westport, Conn.: Greenwood Press. ISBN 0313325812. Roberts, J. A. G. (2002). China to Chinatown: Chinese Food in the West. London: Reaktion. ISBN 1861891334. Sterckx, Roel. Food, Sacrifice, and Sagehood in Early China. New York: Cambridge University Press, 2011 (2015). Sterckx, Roel. Chinese Thought. From Confucius to Cook Ding. London: Penguin, 2019. Swislocki, Mark (2009). Culinary Nostalgia: Regional Food Culture and the Urban Experience in Shanghai. Stanford, CA: Stanford University Press. ISBN 9780804760126. Waley-Cohen, Joanna (2007). "Celebrated Cooks of China's Past". Flavor & Fortune. 14 (4): 5–7, 24. Archived from the original on 2 April 2015. Endymion Wilkinson, "Chinese Culinary History (Feature Review)," China Review International 8.2 (Fall 2001): 285–302. Wilkinson, Endymion (2022). Chinese History: A New Manual. Cambridge, MA: Harvard University Press. ISBN 978-0674260184. Wu, David Y. H.; Cheung, Sidney C. H. (2002). The Globalization of Chinese Food. Richmond, Surrey: Curzon. ISBN 0700714030.
Sources: en.wikipedia.org
== See also == Sodium hyaluronate, the sodium salt of hyaluronic acid, a glycosaminoglycan found in various human connective tissue. Microbial hyaluronic acid production, the process by which microorganisms are utilized in fermentation to synthesize hyaluronic acid. Alguronic acid, trade name for a mix of polysaccharides produced by microalgae. Inhibits production of hyaluronic-acid-degrading enzymes. Bloomage, a biomaterial company based in China, primarily specialized in hyaluronic acid and other bioactive substance products.
Both malate and oxaloacetate can be converted into phosphoenolpyruvate, which is the product of phosphoenolpyruvate carboxykinase, the first enzyme in gluconeogenesis. The net result of the glyoxylate cycle is therefore the production of glucose from fatty acids. Succinate generated in the first step can enter into the citric acid cycle to eventually form oxaloacetate.
A major part of EU law, and most of the EU's budget, concerns public regulation of enterprise and public services. A basic norm of the Treaty on the Functioning of the EU, in article 345, is that the "Treaties shall in no way prejudice the rules in Member States governing the system of property ownership", meaning the EU remains neutral between private or public ownership, but that it can require common standards. In the cases of education and health, member states generally organise public services and the EU requires free movement. There is a unified European Central Bank that funds private banks, and adopts a common monetary policy for price stability, employment and sustainability. The EU's policies on energy, agriculture and forestry, transport and buildings are crucial to end climate damage and shift completely to clean energy that does not heat the planet. Among these, 33% of the entire EU budget is spent on agricultural subsidies to farm corporations and owners. The EU also has an increasing number of policies to raise standards for communications, the internet, data protection, and online media. It has limited involvement in the military and security, but a Common Foreign and Security Policy.
=== Laboratory findings === These include regenerative anaemia, spherocytosis, icteric plasma, leukopenia due to neutropenia, thrombocytopenia, eosinopenia and bilirubinuria. The alanine aminotransferase, aspartate aminotransferase and creatine kinase levels may be raised. The gamma-glutamyltransferase, urea and creatinine levels remain normal.
==== Formation of the state (1945–1946) ==== After the Second World War most of Northwest Germany lay within the British Zone of Occupation. On 23 August 1946, the British Military Government issued Ordinance No. 46 "Concerning the dissolution of the provinces of the former state of Prussia in the British Zone and their reconstitution as independent states", which initially established the State of Hanover on the territory of the former Prussian Province of Hanover. Its minister president, Hinrich Wilhelm Kopf, had already suggested in June 1945 the formation of a state of Lower Saxony, that was to include the largest possible region in the middle of the British Zone. In addition to the regions that actually became Lower Saxony subsequently, Kopf asked, in a memorandum dated April 1946, for the inclusion of the former Prussian district of Minden-Ravensberg (i.e. the Westphalian city of Bielefeld as well as the Westphalian districts of Minden, Lübbecke, Bielefeld, Herford and Halle), the district of Tecklenburg and the state of Lippe. Kopf's plan was ultimately based on a draft for the reform of the German Empire from the late 1920s by Georg Schnath and Kurt Brüning. The strong Welf connotations of this draft, according to Thomas Vogtherr, did not simplify the development of a Lower Saxon identity after 1946.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.
No. Cardarine is not an anabolic steroid; it belongs to a different chemical class that targets PPARδ. Steroids act primarily through androgen receptors, while cardarine acts through a nuclear receptor involved in metabolism.
Some rodent studies reported increased endurance and changes in fat metabolism after cardarine exposure. Long-term studies in animals also raised concerns about cancer in certain tissues. Human trial data are limited, so these findings cannot be directly translated to people.
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.