A practical reference on PPARδ: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-08-21. Anything still debated is marked as such rather than presented as settled.
GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
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.
| Property | Value | Notes |
|---|---|---|
| Primary target | PPARδ | Nuclear receptor; not androgen receptor |
| Studied indications | Dyslipidemia; obesity; diabetes | Early clinical research; development discontinued |
| Rodent toxicity | Tumor formation in multiple tissues | Dose-dependent findings in some studies |
| Human approval | None | No approved therapeutic use |
| Typical analytical method | LC-MS/MS | Used for identity and quantification |
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.
Stability of GW501516 depends on form, temperature, light exposure, and moisture. Solid reference material is typically stored frozen or refrigerated in a desiccator and protected from light. Solutions in organic solvents such as dimethyl sulfoxide are often kept frozen in aliquots to reduce freeze-thaw cycling. Aqueous solubility is low, so aqueous stock solutions can be difficult to prepare without cosolvents. Degradation may appear as changes in chromatographic purity or mass spectral signal. Stability studies are needed to establish shelf life for any specific preparation.
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.
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.
== Medical uses == Norgestrienone was used in hormonal contraception to prevent pregnancy. It has typically been used as an oral contraceptive at a dosage of 2 mg/day in combination with ethinylestradiol and 350 μ/day when used alone.
1930) 5 October – Bill Munro, 89, Scottish football player (Barrow) and manager (Clydebank, Airdrieonians). 15 October – Edward Cairney, 82, convicted murderer 16 October – Gordon Low, 83, Scottish footballer (Huddersfield Town, Bristol City, Stockport County). 18 October – David P. Webster, 95, Scottish author, historian, and sports promoter (World Highland Games Championships), complications from dementia. 20 October – Donald Angus Cameron of Lochiel, 77, Scottish clan chief and public servant, Lord Lieutenant of Inverness (2002–2021). Donald Mackay, 86, Scottish-born Canadian chemical engineer. 31 October – Hugh Wyllie, 89, Scottish Presbyterian minister, moderator of the General Assembly of the Church of Scotland (1992–1993). 6 November – John Fahy, 80, Scottish footballer (Germiston Callies, Oxford United). Norman Munnoch, 94, Scottish rugby union player (Watsonian, Edinburgh District, national team). 8 November – Dale Reid, 64, Scottish golfer. 10 November – Colin Mackay, 79, Scottish journalist. 13 November – Gordon Wallace, 74, Scottish footballer (Raith Rovers, Dundee United, Berwick Rangers). 19 November – Eddie Linden, 88, Scottish publisher and poet. 26 November – Norman Irons, 82, Scottish councillor and honorary consul, lord provost of Edinburgh (1992–1996). 28 November – James Douglas-Hamilton, Baron Selkirk of Douglas, 81, Scottish politician, MP (1974–1997), MSP (1999–2007) and member of the House of Lords (1997–2023). 30 November – John Byrne, 83, Scottish playwright (The Slab Boys Trilogy, Tutti Frutti, Your Cheatin' Heart) and designer.
For copper, the CTAP-1 sensor shows a response in the UV region when Cu(I) binds to an azatetrathiacrown motif that in turn excites a pyrazoline-based dye that is attached. In Coppersensor-1 (CS1), a thioether-rich motif binds to Cu(I) causing the excitation of a boron-dipyrromethene (BODIPY) dye in the visible region. Iron sensors include Pryrene-TEMPO, in which the binding of iron to TEMPO quenches the fluorescence of pyrene when no Fe(II) is bound. Upon binding however, TEMPO is reduced and pyrene regains fluorescence. This probe is limited in that an analogous response can be generated by unwanted free radicals, and that it can only by used in acidic solution. The DansSQ Fe(II)-binding system consists of a Dansyl group bound to styrylquinoline and operates by the disruption of intra-molecular charge transfer. It is limited in that it is only soluble in acetonitrile in 10% H2O. Cobalt sensors have been made that capitalize on the breaking of C-O bonds by Co(II) in a fluorescent probe known as Cobalt Probe 1 (CP1).
In May 1972, President Richard M. Nixon and Soviet Premier Leonid Brezhnev negotiated an easing of relations known as détente, creating a temporary "thaw" in the Cold War. The two nations planned a joint mission to dock the last US Apollo craft with a Soyuz, known as the Apollo-Soyuz Test Project (ASTP). To prepare, the US designed a docking module for the Apollo that was compatible with the Soviet docking system, which allowed any of their craft to dock with any other (e.g. Soyuz-to-Soyuz as well as Soyuz-to-Salyut). The module was also necessary as an airlock to allow the men to visit each other's craft, which had incompatible cabin atmospheres. The USSR used the Soyuz 16 mission in December 1974 to test modifications of the Soyuz atmosphere and the docking adapter to prepare for ASTP. The joint mission began when Soyuz 19 was first launched on July 15, 1975, at 12:20 UTC, and the Apollo craft was launched with the docking module six and a half hours later. The two craft rendezvoused and docked on July 17 at 16:19 UTC. The three astronauts conducted joint experiments with the two cosmonauts, and the crew shook hands, exchanged gifts, and visited each other's craft.
Sources: en.wikipedia.org
== Further reading == Manila, S.; Recan, D.; Sewry, C. A.; Hoeltzenbein, M.; Llense, S.; Leturcq, F.; Deburgrave, N.; Barbot, J.-C.; Man, Nguyen thi (1998-05-01). "Mutations in Emery–Dreifuss Muscular Dystrophy and their Effects on Emerin Protein Expression". Human Molecular Genetics. 7 (5): 855–864. doi:10.1093/hmg/7.5.855. ISSN 0964-6906. PMID 9536090. Ziat, Esma; Bertrand, Anne T. (2015-01-01). "FHL1 protein isoforms in Emery–Dreifuss muscular dystrophy". Orphanet Journal of Rare Diseases. 10 (2): O18. doi:10.1186/1750-1172-10-S2-O18. ISSN 1750-1172. PMC 4652543.
Jason Wilson of The Guardian said that Schmitt was "attempting to articulate white nationalist politics in a way that is not so explicit that people who aren't clued into this sort of stuff will notice." In April 2025, when asked about Trump's defunding of Title X grants to Missouri healthcare providers, Schmitt said he would be "happy to look at it more closely" and questioned the severity of the defunding of federal programs. Also in April, Schmitt filed a bill to make Easter Monday a federal holiday.
=== Interactions === Human herpesvirus 6 lives primarily on humans and, while variants of the virus can cause mild to fatal illnesses, can live commensally on its host. It has been demonstrated that HHV-6 fosters the progression of HIV-1 upon coinfection in T cells. HHV-6 upregulates the expression of the primary HIV receptor CD4, thus expanding the range of HIV susceptible cells. Several studies also have shown that HHV-6 infection increases production of inflammatory cytokines that enhance in vitro expression of HIV-1, such as TNF-alpha, IL-1 beta, and IL-8. A more recent in vivo study shows HHV-6A coinfection to dramatically accelerate the progression from HIV to AIDS in pigtailed macaques. HHV-6 has also been demonstrated to transactivate Epstein–Barr virus.
Sources: en.wikipedia.org
Research indicates that systematic physical stimuli from standard electronic devices, such as tablets with headphones, may treat injured nervous systems online by modulating neuronal plasticity. Evidence suggests that teleneurotherapy could enhance neurological treatment if it incorporates the therapeutic effect of a systematic abiotic impact of physical forces with key parameters of mother-fetus interaction. Recent research has shown therapeutic effects when implementing the APIN method in the online treatment of patients with various neurological conditions. Telenutrition refers to the use of video conferencing or telephony to provide online consultations by nutritionists or dieticians. Telerehabilitation (or e-rehabilitation) is the delivery of rehabilitation services over telecommunication networks and the Internet. Most services fall into two categories: clinical assessment (evaluating the patient's functional abilities in their environment) and clinical therapy.
Salvia divinorum is native to the Sierra Mazateca in Oaxaca, Mexico, where it is still used by the Mazatec, primarily to facilitate shamanic visions in the context of curing or divination. S. divinorum is one of several plant species with hallucinogenic properties that are ritually used by Mazatec shamans. In their rituals, the shamans use only freshly harvested S. divinorum leaves. They see the plant as an incarnation of the Virgin Mary, and begin the ritual with an invocation to Mary, Saint Peter, the Holy Trinity, and other saints. Ritual use traditionally involves being in a quiet place after ingestion of the leaf—the Maztec shamans say that "La Maria (S. divinorum) speaks with a quiet voice." It is also used in smaller amounts, as a diuretic, and to treat ailments including diarrhea, anemia, headaches, rheumatism, and a semi-magical disease known as panzón de borrego, or a swollen belly (literally, "lamb belly"). The history of the plant is not well known, and there has been no definitive answer to the question of its origin. Speculation includes Salvia divinorum being a wild plant native to the area; a cultigen of the Mazatecs; or a cultigen introduced by another Indigenous group. Botanists have also not been able to determine whether it is a hybrid or a cultigen.
Treatment of men with exogenous testosterone or other AAS results in suppression of gonadotropin secretion and gonadal testosterone production due to their antigonadotropic effects or activation of the AR in the pituitary gland, resulting in inhibition or abolition of spermatogenesis and fertility:
Sources: en.wikipedia.org
It targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not act primarily on androgen receptors. This distinction separates it from SARMs.
Rodent studies found dose-dependent tumors in several organs. The sponsor discontinued the program over cancer concerns. Human risk from long-term use remains unknown.
Controlled human endurance trials are lacking. Animal studies show increased exercise capacity under some conditions. Anecdotal reports are not equivalent to clinical evidence.
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.