If you have been reading about GW501516 and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2025-10-25. Numbers and descriptions here follow the published literature rather than marketing material.
In the fitness and bodybuilding literature, cardarine is frequently discussed as an endurance agent or fat-loss compound, although such claims are not supported by robust clinical evidence. Online descriptions often mix animal data, user anecdotes, and marketing language. Researchers who study PPARδ agonists distinguish between receptor activation in controlled experiments and unsupervised use of unverified products. The latter introduces unknown purity, dose, and interactions, making reported experiences difficult to interpret scientifically.
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
Laboratory studies have examined GW501516 in cell cultures and rodents for conditions such as dyslipidemia, insulin resistance, and obesity. Some trials in humans were initiated, but development was discontinued after preclinical findings raised concerns about cancer in certain models. Those findings do not prove that the compound causes cancer in people, but they contributed to regulatory caution. Later reviews often describe the evidence as preliminary and insufficient for assessing long-term safety.
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.
| Property | Value | Notes |
|---|---|---|
| Solubility | Soluble in dimethyl sulfoxide and some organic solvents; practically insoluble in water | Solvent choice affects laboratory handling |
| Typical storage | -20 °C, desiccated, protected from light | Common condition for research samples |
| Analytical method | Liquid chromatography–tandem mass spectrometry (LC-MS/MS) | Used for identification and quantification in biological or product samples |
| Common synonyms | GW501516, GW-501516, GSK-516, Endurobol | Names found in research and anti-doping literature |
| Regulatory status | Unapproved therapeutic; prohibited in competitive sport | Status can vary by country and context |
Cardarine is a common name for GW501516, an investigational compound developed in the 1990s for metabolic conditions. It acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in lipid and energy metabolism. The compound is frequently mislabeled as a selective androgen receptor modulator, or SARM, but its molecular target is different. GW501516 reached early clinical testing before development was discontinued. It has no approved therapeutic use in any country. The name cardarine is not a formal international nonproprietary name.
Regulatory treatment varies, but cardarine is not approved as a medicine. Sports authorities list GW501516 as a prohibited substance, and it is banned at all times under the World Anti-Doping Agency code. Many countries restrict sales for human consumption, while online vendors market it as a research chemical. Such products may lack purity data, and their actual contents can differ from the label. Purchasing or possessing cardarine may carry legal consequences depending on jurisdiction. The compound is not a dietary supplement ingredient in regulated markets.
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.
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.
While the character is usually physically invincible, he demonstrates emotional and psychological vulnerability, exemplifying values and aspirations of resilience for his audience. Flores notes that Wolverine's fanbase consists primarily of men and the character generally exemplifies a masculine perspective on recovery from trauma; despite this, she found him therapeutic in her own recovery from rape. Nnedi Okorafor, a Nigerian American science-fiction author, stated that Wolverine was a therapeutic role model for her during her experience of paralysis following surgical treatment of scoliosis. J. Andrew Deman praises "The Wounded Wolf" story illustrated by Windsor-Smith that appeared in Uncanny X-Men, comparing it to the Iliad. Comic book critics have particularly commended Windsor-Smith's Weapon X story, which describes Wolverine's mistreatment at the hands of the Weapon X program and his experience of trauma. Hagai Palevsky describes it as "quite possibly the best comic Marvel ever published." Rolling Stone journalist Sean T. Collins calls it "Arguably the most important and the most visually impressive Wolverine storyline of all time." In contrast, Paul Young criticizes the trends of the mid-1990s in which Wolverine and other anti-heroes became ubiquitous (he describes this as "Wolverine-mania") and often marketed with gimmick covers. Among later stories, critic Jim Davis considers "Enemy of the State" and "Old Man Logan", both by Millar, to be particularly notable.
Three prime untranslated regions (3′UTRs) of messenger RNAs (mRNAs) often contain regulatory sequences that post-transcriptionally influence gene expression. Such 3′-UTRs often contain both binding sites for microRNAs (miRNAs) as well as for regulatory proteins. By binding to specific sites within the 3′-UTR, miRNAs can decrease gene expression of various mRNAs by either inhibiting translation or directly causing degradation of the transcript. The 3′-UTR also may have silencer regions that bind repressor proteins that inhibit the expression of a mRNA. The 3′-UTR often contains microRNA response elements (MREs). MREs are sequences to which miRNAs bind. These are prevalent motifs within 3′-UTRs. Among all regulatory motifs within the 3′-UTRs (e.g. including silencer regions), MREs make up about half of the motifs. As of 2014, the miRBase web site, an archive of miRNA sequences and annotations, listed 28,645 entries in 233 biologic species. Of these, 1,881 miRNAs were in annotated human miRNA loci. miRNAs were predicted to have an average of about four hundred target mRNAs (affecting expression of several hundred genes). Friedman et al. estimate that >45,000 miRNA target sites within human mRNA 3′UTRs are conserved above background levels, and >60% of human protein-coding genes have been under selective pressure to maintain pairing to miRNAs. Direct experiments show that a single miRNA can reduce the stability of hundreds of unique mRNAs.
=== Endothelin-1(ET-1) === Is a vasoconstrictor peptide released from vascular endothelial cells. At the cellular level, the balance between vasodilator (Nitric oxide) and vasoconstrictor (ET-1) actions determines the vascular response to insulin. So, high levels of ET-1, which achieved in insulin resistance states that includes patients that have T2DM or metabolic syndromes or they are obese, have inhibitory effect on nitric oxide production which results in low nitric oxide and heightened levels of ET-1. ET-1 activity is also enhanced secondary to abnormalities in vascular insulin signalling, In addition to its direct vasoconstrictor effects. Furthermore, ET-1 induces a reduction in insulin sensitivity and may take part in the development of the metabolic syndrome.
Marguerite Yourcenar (UK: , US: ; French: [maʁɡ(ə)ʁit juʁsənaʁ] ; born Marguerite Antoinette Jeanne Marie Ghislaine Cleenewerck de Crayencour; 8 June 1903 – 17 December 1987) was a Belgian-born French novelist and essayist who became a US citizen in 1947. Winner of the Prix Femina and the Erasmus Prize, she was the first woman elected to the Académie Française, in 1980. In 1965, she was nominated for the Nobel Prize in Literature.
Sources: en.wikipedia.org
Alfatradiol, also known as 17α-estradiol and sold under the brand names Avicis, Avixis, Ell-Cranell Alpha, and Pantostin, is a weak estrogen and 5α-reductase inhibitor medication which is used topically in the treatment of pattern hair loss (androgenic alopecia or pattern baldness) in men and women. It is a stereoisomer of the endogenous steroid hormone and estrogen 17β-estradiol (or simply estradiol).
In spite of these warnings, the Luftwaffe did little to address this and treated the entire topic with some level of disdain. Their own radars were superior to CH in many ways, but had proven to be only marginally useful. During the Air Battle of the Heligoland Bight in 1939, a German Freya radar detected the raid while it was still an hour away from its target, yet had no way to report this to any of the fighter units that could intercept it. Getting the information from the radar to the pilots in a useful form appeared to be a difficult problem, and the Germans believed the British would have the same difficulty and thus radar would have little real effect. Some desultory effort was put into attacking the CH stations, especially during the opening stages of the Battle. British engineers were able to quickly return these units to service, or in some cases simply pretend to do so in order to fool the Germans into thinking the attacks failed. As the pattern of these attacks became clear, the RAF began to counter them with increasing effectiveness. The Junkers Ju 87 dive bombers were subjected to catastrophic losses and had to be withdrawn from battle. The Germans gave up trying to attack CH directly on any reasonable scale. Thus, CH was allowed to operate throughout the Battle largely unhindered. Although communications were indeed a serious problem, it was precisely this problem that the Dowding system had been set up to address, at great expense. The result was that every British fighter was roughly twice or perhaps more as effective than its German counterpart.
=== Warfare and weapons === At RAF Bomber Command, Dyson and colleagues proposed removing two gun turrets from Avro Lancaster bombers, to cut the catastrophic losses due to German fighters in the Battle of Berlin. A Lancaster without turrets could fly 50 mph (80 km/h) faster and be much more manoeuvrable.
Sources: en.wikipedia.org
Dinosterol has been used as an indicator for dinoflagellate production in the Cariaco Basin. In such studies, it has been revealed that the accumulation of dinosterol peaks at a rate of almost 900 mg compound/cm2/yr during the Younger Dryas. Hydrogen isotope ratios in dinosterols can serve to reconstruct salinity semi-quantitatively. Some studies have revealed that certain dinoflagellates produce sterols that have the potential to serve as genera-specific biomarkers. Recent work showed that dinoflagellate genera, which formed discrete clusters in the 18S rDNA-based phylogeny, shared similar sterol compositions. This suggested that the sterol compositions of dinoflagellates are explained by the evolutionary history of this lineage.
For services to School Governance and to Children and Young People with Special Educational Needs. Nigel Gavin Begg. Founder, Aspire Technology Solutions. For services to Digital and Technology Industry Growth in North East England. Lynda Janet Suzanne Bennett. For services to Hockey in Wales. Trudy Helen Berlet. Lately Lead Midwife for Bereavement Care, Worcestershire Acute Hospitals NHS Trust. For services to Midwifery. Professor Miriam Bernard. Professor Emerita, Social Gerontology, Keele University. For services to Ageing Research and to Older People. Jane Alison Betsworth. Headteacher, Millfields Community School, London Borough of Hackney. For services to Education. Dr. Sanjay Bhandari. Chair, Kick It Out. For services to Sport. Dr. Manav Bhavsar. Lately Clinical Lead, Critical Care. For services to Healthcare, particularly during Covid-19. Helen Binns. Manager, Families First Team, Leeds City Council. For services to Vulnerable People. Amanda Jayne Bird. Senior Supply Chain Coordinator, Leidos Europe Limited. For services to Defence Logistics. Zachary Birks. Team Leader, Ministry of Defence. For services to Defence. Professor Anthony John Bjourson. Emeritus Professor of Genomics and lately Director, Northern Ireland Centre for Stratified Medicine, Ulster University. For services to Higher Education and to Research. Anthony Grant Bloom. Chairman, Brighton and Hove Albion Football Club. For services to Association Football and to the community in Brighton. Anthony John Bloxham.
==== Using difference between detrital zircons crystallisation ages and their corresponding maximum depositional age ==== Apart from the detrital zircon age abundance, difference between detrital zircons crystallisation ages (CA) and their corresponding maximum depositional age (DA) can be plotted in cumulative distribution function to correlate particular tectonic regime in the past. The effect of different tectonic settings on the difference between CA and DA is illustrated in Figure 7 and summarized in Table. 3.
Sources: en.wikipedia.org
It binds and activates PPARδ, a nuclear receptor that influences gene expression related to fatty acid metabolism and energy balance. This mechanism has been studied mainly in animals and cell models, not established as a safe human therapy.
No. It is not an anabolic-androgenic steroid; it is a synthetic PPARδ agonist. Because it is banned in sport, it is sometimes grouped with doping agents even though its chemical class differs from steroids.
Human data are limited and development was discontinued, so major effects and long-term risks are not well characterized. Some early studies examined metabolic markers, but they do not provide a basis for unsupervised use.
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.