A practical reference on fatty acid oxidation: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-03-15. Anything still debated is marked as such rather than presented as settled.
Cardarine is a common name for GW501516, a synthetic compound first described in the 1990s as a selective agonist of the peroxisome proliferator-activated receptor delta. It was studied in preclinical models for metabolic and cardiovascular conditions, but it has not been approved as a medicine in the United States, Europe, or other major jurisdictions. Retail products labeled as cardarine are generally research chemicals or supplements, not pharmaceutical formulations. Because human safety and efficacy data remain limited, regulatory agencies treat it as an unapproved substance rather than a therapeutic product.
Sporting authorities added GW501516 to prohibited lists after it appeared in athlete samples and online markets. The World Anti-Doping Agency classifies it as a hormone and metabolic modulator, and its use can lead to an anti-doping rule violation. Some early laboratory work suggested effects on fatty acid oxidation and endurance-related metabolism in animals, but those findings do not establish safe or effective use in people. Reports of adverse events in humans are scarce and often anecdotal, which complicates risk assessment.
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
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.
GW501516 binds and activates PPARδ, a nuclear receptor that influences transcription of genes involved in fatty acid oxidation and energy use. Activation shifts some metabolic pathways in preclinical models, which is why the compound has been studied for lipid disorders and exercise-related endpoints. The exact downstream effects in humans are incompletely mapped. PPARδ is expressed in many tissues, including skeletal muscle, liver, and adipose tissue, so broad activation may have varied consequences. Researchers continue to examine how selective or partial activation might alter the balance between benefits and risks.
| Property | Value | Notes |
|---|---|---|
| IUPAC name | {4-[({4-methyl-2-[4-(trifluoromethyl)phenyl]-1,3-thiazol-5-yl}methyl)sulfanyl]phenoxy}acetic acid | Systematic name for GW501516 |
| CAS Registry Number | 317318-70-0 | Unique identifier for the parent compound |
| Molecular formula | C21H18F3NO3S2 | Includes carbon, hydrogen, fluorine, nitrogen, oxygen, and sulfur |
| Molecular weight | 453.5 g/mol | Approximate value for the neutral form |
| Appearance | White to off-white powder | Typical description for purified laboratory material |
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.
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.
== Appearances == Alyx appears in the video game Half-Life 2 as a recurring ally to protagonist Gordon Freeman, and the daughter of Eli Vance, all of whom operate as members of the Resistance. She is first encountered when she saves Gordon from an attack, and later gives him the gravity gun (a tool used to manipulate objects) while playing with her robot, Dog. She helps Gordon through various incidents, including helping rescue her father and defeating one of the game's antagonists, Wallace Breen. She also has disputes with the character Judith Mossman, who later betrays them before they eventually make peace and work together. She ultimately becomes separated from Gordon after the G-Man stops time during a dark energy explosion at the Citadel, removing Gordon from that point in time and leaving Alyx. In the expansion, Half-Life 2: Episode One, it's revealed that Alyx was rescued by Vortigaunts, who also retrieve Gordon from G-Man, leaving them both outside the Citadel. They work together to delay the explosion by slowing the core's progression toward meltdown. They later go through a zombie-infested underground station and later working with Barney Calhoun to rescue members of the rebellion before the Citadel explodes. In Half-Life 2: Episode Two, Alyx and Gordon travel to the White Forest Rocket Facility to deliver a crucial information packet stolen from the Citadel. Along the way, she is gravely wounded by a Combine Hunter.
== References == Hansard Indexes for 1993–2000, "Legislature of Western Australia" "No.32 (Special)". Western Australia Government Gazette. 16 February 1993. p. 1993:1287–1289. "No.116 (Special)". Western Australia Government Gazette. 25 August 1993. p. 1993:4599. "No.8 (Special)". Western Australia Government Gazette. 25 January 1994. p. 1994:278–279. "No.18 (Special)". Western Australia Government Gazette. 10 February 1995. p. 1995:477–478. "No.176 (Special)". Western Australia Government Gazette. 21 December 1995. p. 1995:6163–6164. "No.5 (Special)". Western Australia Government Gazette. 9 January 1997. p. 1997:99–100. Phillips, Harry; Black, David (June 1996). "Australian Political Chronicle: July–December 1995". Australian Journal of Politics and History. 42 (2): 271. ISSN 0004-9522.
Burger King Corporation (also known as BK) is an American fast food chain of hamburger fast food restaurants, headquartered in Miami-Dade County, Florida. The company was founded on July 23, 1953, as Insta-Burger King, a Jacksonville, Florida–based restaurant chain. After Insta-Burger King ran into financial difficulties, its two Miami-based franchisees David Edgerton (1927–2018) and James McLamore (1926–1996) purchased the company in 1959. Over the next half-century, the company changed hands four times and its third set of owners, a partnership between TPG Capital, Bain Capital, and Goldman Sachs Capital Partners, took it public in 2002. In late 2010, 3G Capital of Brazil acquired a majority stake in the company in a deal valued at US$3.26 billion. The new owners promptly initiated a restructuring of the company to reverse its fortunes. 3G, along with its partner Berkshire Hathaway, eventually merged the company with the Canadian-based coffeehouse chain Tim Hortons under the auspices of a new Canadian-based parent company named Restaurant Brands International.
Irene Hirano, fundraiser for charitable causes and second wife of Daniel Inouye Leicester City footballer Keith Weller, who made over 300 appearances for the Foxes, scoring 47 goals, made four appearances for England, scoring one goal. Katie Price Canadian public-health physician Sheela Basrur (1956–2008) developed uterine leiomyosarcoma in 2006. American actress Diana Sands The first year of treatment for leiomyosarcoma of Canadian comedian Irwin Barker was the subject of a 2008 television documentary, That's My Time; he died in 2010. Linda Uttley (1966–2009), English rugby union footballer in the Women's England Team, was diagnosed with leiomyosarcoma in 2007 and died in 2009 at the age of 43. Deborah Finck (1967–2025), TikToker and Nanny 911 star, was diagnosed with leiomyosarcoma in 2020 and died on January 14, 2025, at the age of 57. Loni Anderson (1945–2025), American actress, died from metastatic uterine leiomyosarcoma on August 3, 2025, at the age of 79.
Sources: en.wikipedia.org
Injection of CRH into the rodent paraventricular nucleus of the hypothalamus (PVN) can increase CRFR1 expression, with increased expression leading to depression-like behaviors. Sex differences have also been observed with respect to both CRH and the receptors that it interacts with. CRFR1 has been shown to exist at higher levels in the female nucleus accumbens, olfactory tubercle, and rostral anteroventral periventricular nucleus (AVPV) when compared to males, while male voles show increased levels of CRFR2 in the bed nucleus of the stria terminalis compared to females. The CRH-1 receptor antagonist pexacerfont is currently under investigation for the treatment of generalized anxiety disorder. Another CRH-1 antagonist antalarmin has been researched in animal studies for the treatment of anxiety, depression and other conditions, but no human trials with this compound have been carried out. The activation of the CRH1 receptor has been linked with the euphoric feelings that accompany alcohol consumption. A CRH1 receptor antagonist developed by Pfizer, CP-154,526 is under investigation for the potential treatment of alcoholism. Increased CRH production has been observed to be associated with Alzheimer's disease. Although one action of CRH is immunosuppression via the action of cortisol, CRH itself can actually heighten the immune system's inflammation response, a process being investigated in multiple sclerosis research. Autosomal recessive hypothalamic corticotropin deficiency has multiple and potentially fatal metabolic consequences including hypoglycemia.
Examples of devices that support DisplayPort Alternate Mode over USB-C include: MacBook, Chromebook Pixel, Surface Book 2, Samsung Galaxy Tab S4, iPad Pro (3rd generation), iPhone 15/15 Pro, HTC 10/U Ultra/U11/U12+, Huawei Mate 10/20/30, LG V20/V30/V40*/V50, OnePlus 7 and newer, ROG Phone, Samsung Galaxy S8 and newer, Nintendo Switch, Sony Xperia 1/5 etc.
Pre-exposure to the antigens present in vaccines elicits a primary response. After injection, antigens will be ingested by antigen-presenting cells (APCs), such as dendritic cells and macrophages, via phagocytosis. The APCs will travel to lymph nodes, where immature B cells and T cells are present. Following antigen processes by APCs, antigens will bind to either MHC class I receptors or MHC class II receptors on the cell surface of the cells based on their compositional and structural features to form complexes. Antigen presentation occurs, in which T cell receptors attach to the antigen-MHC complexes, initiating clonal expansion and differentiation, and hence the conversion of naive T cells to cytotoxic T cells (CD8+) or helper T cells (CD4+). Cytotoxic CD8+ cells can directly destroy the infected cells containing the antigens that were presented to them by the APCs by releasing lytic molecules, while helper CD4+ cells are responsible for the secretion of cytokines that activates B cells and cytotoxic T cells. B cells can undergo activation in the absence of T cells via the B cell receptor signalling pathway. After dendritic cells capture the immunogen present in the vaccine, they can present the substances to naive B cells, causing the proliferation of plasma cells for antibody production. Isotype switching can take place during B cell development for the formation of different antibodies, including IgG, IgE and IgA. Memory B cells and T cells are formed post-infection.
Though the core competencies of Dionex have traditionally been in ion chromatography, through strategic acquisitions and technology transfers, it has quickly established itself as the primary producer of polymeric monoliths.
Directed by David Cohen, made by Psychology News 7 November Life and Art, about assisted reproductive technology (ART) and zygote intrafallopian transfer; Debra Hauer gives a talk at Acland Burghley School; Hossam Abdalla (now on the Human Tissue Authority at the Lister Hospital, Chelsea; the assisted zona hatching technique; intracytoplasmic sperm injection; Robert Winston, Baron Winston of Hammersmith Hospital. Directed by Debra Hauer, produced by Christopher Rawlence, made by Hauer Rawlence 21 November Building for Earthquakes, earthquake engineering in Mexico City; Edward Bortugno of the Office of Emergency Services, California; structural engineer Enrique Martinez Romero of Mexico, and the building of the Mexican Social Security Institute; an earthquake was expected near Acapulco in the next ten years; the North Anatolian Fault is the world's most energetic fault; seismologist Polat Gulkan of the Middle East Technical University; Attilla Ansal, editor of the Bulletin of Earthquake Engineering; Müzeher Erciyastepe of the İnşaat Mühendisleri Odası (IMO, Chamber of Engineers); the gecekondu unsafe buildings; the recent 1992 Erzincan earthquake. Narrated by Seán Barrett (actor), directed by Nick Read, produced by Bill Redway, made by October Films 28 November Space Shuttle Discovery, the Johnson Space Center in Texas, and the ACTS satellite (launched in September 1993 on STS-51) and the shuttle pallet satellite (SPAS) system; the 57th mission of the shuttle - STS-51; Commander Frank L.
Sources: en.wikipedia.org
No. Major drug regulators have not approved GW501516 for treating any medical condition. Products sold as cardarine are typically unapproved research chemicals or supplements, so their contents and safety are not assured.
It is prohibited by the World Anti-Doping Agency as a hormone and metabolic modulator. Athletes who test positive for GW501516 can face sanctions, including suspensions and loss of results.
Cardarine is a common or trade-style name, while GW501516 is the research code for the same chemical entity. Some sources also use Endurobol or GSK-516. The names refer to the same compound, not distinct drugs.
Anti-doping and clinical laboratories commonly use liquid chromatography-tandem mass spectrometry. The method can identify GW501516 and its metabolites in urine or blood. Detection depends on sample timing and the amount present.