PPARδ agonist raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-09-19 and is reviewed periodically as new material appears.
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.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
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.
Cardarine is the common name for GW501516, a synthetic compound studied as a peroxisome proliferator-activated receptor delta agonist. Researchers developed it to explore treatments for lipid disorders and metabolic conditions. It is not an approved medicine in any country. Early clinical work examined changes in HDL cholesterol and triglycerides, but development was discontinued after animal studies raised concerns about cancer. The compound remains available as a research chemical and appears in discussions of performance enhancement.
| Property | Value | Notes |
|---|---|---|
| Common name | Cardarine | Common internet and media name. |
| Research code | GW501516 | Also written GW-1516. |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator. |
| Development status | Discontinued | Clinical development halted after rodent cancer findings. |
| Regulatory status | Prohibited in sport | Listed by WADA; not approved as medicine. |
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.
Quality assessment for cardarine samples usually combines identity, purity, and impurity testing. Nuclear magnetic resonance spectroscopy and mass spectrometry can confirm molecular structure, while high-performance liquid chromatography estimates purity. Certificates of analysis from testing laboratories may list these results, but they do not establish safety or legality. In the absence of approved manufacturing, products sold online may contain the wrong compound, variable amounts, or unlisted contaminants. Independent verification is therefore central to analytical work and to interpreting any reported biological activity.
Laboratory detection of GW501516 commonly uses liquid chromatography coupled with tandem mass spectrometry. The method can identify the parent compound or its metabolites in urine and blood after sample cleanup. Protein precipitation, solid-phase extraction, or enzymatic hydrolysis may precede analysis, depending on the matrix. Reference standards are required for accurate quantification and confirmation. Because the compound is not approved, testing often occurs in anti-doping, forensic, or research settings rather than routine clinical care. Results are reported with limits of detection and quantification.
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.
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.
fatty acid Any of a subclass of lipid compounds consisting of a carboxylic acid bonded to an aliphatic chain of hydrocarbons, usually 4 to 28 carbon atoms in length, which may be either saturated (containing only single bonds between the carbon atoms) or unsaturated (containing one or more double bonds). In biological systems, fatty acid chains are commonly linked to other compounds via ester bonds, primarily in triglycerides, phospholipids, and derivatives of cholesterol, all of which serve a wide variety of important cellular functions including as structural components of membranes and as energy sources in metabolic pathways.
==== Analgesia creation ==== Morphine creates analgesia through the activation of a specific group of neurons in the rostral ventromedial medulla, called the "morphine ensemble". This ensemble includes glutamatergic neurons that project to the spinal cord, known as RVMBDNF neurons. These neurons connect to inhibitory neurons in the spinal cord, called SCGal neurons, which release the neurotransmitter GABA and the neuropeptide galanin. The inhibition of SCGal neurons is crucial for morphine's pain-relieving effects. Additionally, the neurotrophic factor BDNF, produced within the RVMBDNF neurons, is required for morphine's action. Increasing BDNF levels enhances morphine's analgesic effects, even at lower doses.
autonomy – the patient has the right to refuse or choose their treatment. (Latin: Voluntas aegroti suprema lex.) beneficence – a practitioner should act in the best interest of the patient. (Latin: Salus aegroti suprema lex.) justice – concerns the distribution of scarce health resources, and the decision of who gets what treatment (fairness and equality). non-maleficence – "first, do no harm" (Latin: primum non-nocere). respect for persons – the patient (and the person treating the patient) have the right to be treated with dignity. truthfulness and honesty – the concept of informed consent has increased in importance since the historical events of the Doctors' Trial of the Nuremberg trials, Tuskegee syphilis experiment, and others. Such values do not give answers as to how to handle a particular situation, but provide a useful framework for understanding conflicts. When moral values are in conflict, the result may be an ethical dilemma or crisis. Sometimes, no good solution to a dilemma in medical ethics exists, and occasionally, the values of the medical community (i.e., the hospital and its staff) conflict with the values of the individual patient, family, or larger non-medical community. Conflicts can also arise between health care providers or among family members. For example, some argue that the principles of autonomy and beneficence clash when patients refuse blood transfusions, considering them life-saving; and truth-telling was not emphasized to a large extent before the HIV era.
=== Aryl halide-stapled peptides === Sufficiently electrophilic aryl halides have been used as staples as they can bridge two amino acids with nucleophilic side chains, most notably two cysteines. These include fluorobenzenes and dichlorotetrazine. The diversity of aryl halides in terms of electrophilicity and regiochemistry offers a way of tuning the reactivity and tightness of the staple. The latter aspect has been applied to the tuning of secondary structure of small peptides.
Sources: en.wikipedia.org
Depending on the experimental conditions, cycloaddition of acetone and ketene produces either β-isovalerolactone or 4,4-dimethyloxetan-2-one, both of which hydrolyze under basic conditions to yield the conjugate base of HMB. The haloform reaction provides another pathway to HMB involving the exhaustive halogenation of the methyl-ketone region of diacetone alcohol with sodium hypobromite or sodium hypochlorite; Diacetone alcohol is readily available from the aldol condensation of acetone. An organometallic approach to HMB involves the carboxylation of tert-butyl alcohol with carbon monoxide and Fenton's reagent (hydrogen peroxide and ferrous iron). Alternatively, HMB can be prepared through microbial oxidation of β-methylbutyric acid by the fungus Galactomyces reessii.
== History == The drug was first discovered by scientists including Axel Ullrich and H. Michael Shepard at Genentech, Inc. in South San Francisco, CA. Earlier discovery about the neu oncogene by Robert Weinberg's lab and the monoclonal antibody recognizing the oncogenic receptor by Mark Greene's lab also contributed to the establishment of HER2 targeted therapies. Dr. Dennis Slamon subsequently worked on trastuzumab's development. A book about Dr. Slamon's work was made into a television film called Living Proof, that premiered in 2008. Genentech developed trastuzumab jointly with UCLA, beginning the first clinical trial with 15 women in 1992. By 1996, clinical trials had expanded to over 900 women, but due to pressure from advocates based on early success, Genentech worked with the FDA to begin a lottery system allowing 100 women each quarter access to the medication outside the trials. Herceptin was Fast-tracked by the FDA and gained approval in September 1998. Biocon Ltd and its partner Mylan obtained regulatory approval to sell a biosimilar in 2014, but Roche contested the legality of the approval; that litigation ended in 2016, and Biocon and Mylan each introduced their own branded biosimilars.
Log-odds matrices based on the Dayhoff PAM model were commonly used to assess the significance of homology search results, although the BLOSUM matrices have superseded the PAM log-odds matrices in this context because the BLOSUM matrices appear to be more sensitive across a variety of evolutionary distances, unlike the PAM log-odds matrices. The Dayhoff PAM matrix was the source of the exchangeability parameters used in one of the first maximum-likelihood analyses of phylogeny that used protein data and the PAM model (or an improved version of the PAM model called DCMut) continues to be used in phylogenetics. However, the limited number of alignments used to generate the PAM model (reflecting the limited amount of sequence data available in the 1970s) almost certainly inflated the variance of some rate matrix parameters (alternatively, the proteins used to generate the PAM model could have been a non-representative set). Regardless, it is clear that the PAM model seldom has as good of a fit to most datasets as more modern empirical models (Keane et al. 2006 tested thousands of vertebrate, bacterial, and archaeal proteins and they found that the Dayhoff PAM model had the best-fit to at most <4% of the proteins). Starting in the 1990s, the rapid expansion of sequence databases due to improved sequencing technologies led to the estimation of many new empirical matrices (see for a complete list).
Depyrogenation refers to the removal of pyrogens from solutions, most commonly from injectable pharmaceuticals. A pyrogen is defined as any substance that can cause a fever. Bacterial pyrogens include endotoxins and exotoxins, although many pyrogens are endogenous to the host. Endotoxins include lipopolysaccharide (LPS) molecules found as part of the cell wall of Gram-negative bacteria, and are released upon bacterial cell lysis. Endotoxins may become pyrogenic when released into the bloodstream or other tissue where they are not usually found. Although the colon contains Gram-negative bacteria in abundance, they do not cause a pyrogenic effect as the bacteria are not undergoing gross lysis, and the immune system is not exposed to free endotoxin while the colonic wall is intact. When LPS is released upon bacterial cell lysis, the lipid A component is first bound by serum LPS-Binding Protein (LBP) and then transferred to CD14 (either free CD14 in the serum or bound to the cell surface of macrophages or monocytes). This monomerises the aggregated LPS, as the LPS receptor Toll-like Receptor 4 (TLR4) cannot recognise LPS while aggregated. Monomeric LPS is then transferred to MD-2 pre-complexed with TLR4 on macrophages and monocytes. This leads to release of pro-inflammatory cytokines and nitric oxide, which may lead ultimately to septic shock depending on the strength of response. Vascular endothelial cells also express TLR4 and MD-2 and so respond to LPS directly, as well as via cytokines and nitric oxide.
According to Goodrich, both lineages evolved from an earlier stem group, Protosauria ("first lizards") in which he included some animals today considered reptile-like amphibians, as well as early reptiles. In 1956, D.M.S. Watson observed that the first two groups diverged very early in reptilian history, so he divided Goodrich's Protosauria between them. He also reinterpreted Sauropsida and Theropsida to exclude birds and mammals, respectively. Thus his Sauropsida included Procolophonia, Eosuchia, Millerosauria, Chelonia (turtles), Squamata (lizards and snakes), Rhynchocephalia, Crocodilia, "thecodonts" (paraphyletic basal Archosauria), non-avian dinosaurs, pterosaurs, ichthyosaurs, and sauropterygians. In the late 19th century, a number of definitions of Reptilia were offered. The biological traits listed by Lydekker in 1896, for example, include a single occipital condyle, a jaw joint formed by the quadrate and articular bones, and certain characteristics of the vertebrae. The animals singled out by these formulations, the amniotes other than the mammals and the birds, are still those considered reptiles today. The synapsid/sauropsid division supplemented another approach, one that split the reptiles into four subclasses based on the number and position of temporal fenestrae, openings in the sides of the skull behind the eyes. This classification was initiated by Henry Fairfield Osborn and elaborated and made popular by Romer's classic Vertebrate Paleontology. Those four subclasses were:
Sources: en.wikipedia.org
== Legacy == Allitt was the subject of a book called Murder on Ward Four by Nick Davies. A BBC dramatisation of the case, Angel of Death (2005), featured Charlie Brooks as Allitt. Allitt's story was depicted in episodes of the true crime documentaries Crimes That Shook Great Britain, Deadly Women, Born To Kill?, Evil Up Close, Britain's Most Evil Killers, and Nurses Who Kill. Commentators drew comparisons between convicted murderer Lucy Letby and the Allitt case. The former detective who led the Allitt investigation suggested that Letby might have imitated Allitt's methods. Criminal psychologists Dominic Wilmott and David Holmes proposed that Letby could have been motivated by factitious disorder imposed on another, a theory also raised in relation to Allitt.31:15
This problem however was resolved with the use of so-called self-polishing paints, in which the biocide was released at a slower rate as the seawater reacted with the surface layer of the paint. More recently, copper-based anti-fouling paints have been used because they are less toxic than TBT in aquatic environments, but are only effective against marine animal life, and not so much weed growth. Non-stick coatings contain no biocide but have extremely slippery surfaces which prevents most fouling and makes it easier to clean any fouling that occurs. Natural biocides are found on marine organisms such as coral and sponges and also prevent fouling if applied to a vessel. Creating a difference in electrical charge between the hull and seawater is a common practice in the prevention of fouling. This technology has proven to be effective, but is easily damaged and may be expensive. Finally, microscopic prickles can be added to a coating, and depending on length and distribution have shown the ability to prevent the attachment of most biofouling.
=== Digital infrastructure === Although a few digital technologies can operate in areas with limited mobile phone coverage and internet connectivity, rural network coverage plays an important role in digital agriculture's success.
Hillbilly Elegy: A Memoir of a Family and Culture in Crisis is a 2016 memoir by JD Vance about the Appalachian values of his family from Kentucky and the socioeconomic problems of his hometown of Middletown, Ohio, where his mother's parents moved when they were young. It was adapted into the 2020 film Hillbilly Elegy, directed by Ron Howard and starring Glenn Close and Amy Adams. Later, Vance progressed in politics, becoming a senator from Ohio in 2023 and the vice president of the United States in 2025.
Verbena officinalis var. africana (R. Fern. & Verdc.) Munir (=V. officinalis ssp. africana R.Fern. & Verdc.) Verbena officinalis var. eremicola Munir Verbena officinalis var. gaudichaudii Briq. Verbena officinalis var. macrostachya (F. Muell.) Benth. (=V. macrostachya) Verbena officinalis var. monticola Munir Verbena officinalis var. officinalis L. (=V. domingensis) The Texas vervain (V. halei) is sometimes included in V. officinalis as a subspecies or variety. But despite the outward similarity, biogeography alone strongly suggests there is really no justification to include this North American native here, and DNA sequence data agrees. Instead, V. halei seems to be closely related to V. macdougalii, perhaps with some interbreeding with the V. menthifolia lineage which might explain its Common Vervain-like traits.
Sources: en.wikipedia.org
No. Cardarine is a PPARδ agonist, while selective androgen receptor modulators act on androgen receptors. The two classes differ in receptor target and downstream effects.
Preclinical rodent studies reported cancers, including liver and bladder tumors, at tested doses. The human relevance of those findings is uncertain, but development was discontinued. No approved human product resulted.
No. It remains an investigational compound without approved therapeutic labeling. Sports regulators prohibit its use, and health agencies have warned against consuming it.
Cardarine is a common name for the investigational compound GW501516. It acts as a PPARδ agonist and is not approved for human use. It is prohibited in sport.