Everything below concerns GW501516. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-07-25. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
Because cardarine is not an approved medicine, no pharmacopeial monograph defines its identity, purity, or storage requirements. Laboratories typically rely on in-house methods and reference standards when testing materials labeled as GW501516. Certificates of analysis may report purity and identity for a specific batch, but their scope varies and they do not guarantee safety or legal status. Independent verification can include high-performance liquid chromatography, mass spectrometry, nuclear magnetic resonance, and elemental analysis. The distinction between research chemical labeling and human use is significant because quality standards and oversight differ.
Cardarine can be detected in biological samples and product materials using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The method separates compounds by chromatography and identifies them by mass-to-charge transitions, allowing low-level detection in urine or blood. Sample preparation often involves enzymatic hydrolysis, solid-phase extraction, or protein precipitation. Certified reference materials and isotope-labeled internal standards improve quantification. Detection windows depend on metabolism, matrix, and assay sensitivity, so no single universal window applies.
Regulatory treatment of cardarine differs by context and jurisdiction. In competitive sport, the World Anti-Doping Agency lists PPARδ agonists, including GW501516, as prohibited at all times. Outside sport, it lacks approval as a prescription medicine in major drug markets, and products sold for human consumption may be treated as unapproved drugs. Some countries also restrict importation or sale through general consumer protection and medicines laws. These classifications affect availability, testing, and legal risk without establishing therapeutic value.
| 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 detect GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be used in some programs. Detection depends on factors such as dose, timing, metabolism, and the sensitivity of the assay. Published methods describe limits of detection in the low nanogram per milliliter range for related compounds. Exact detection windows are not fixed for all situations and remain an area of ongoing study.
Products sold as cardarine have been found to contain incorrect compounds, variable amounts, or no active ingredient at all. Independent testing is required to verify identity and purity. Common analytical approaches include high-performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance for structural confirmation. These methods can distinguish GW501516 from related PPAR agonists and from unrelated steroids. For regulators and researchers, such verification is central to interpreting both biological results and adverse event reports.
Cardarine is prohibited in competitive sport under the World Anti-Doping Agency code, where it is classified as a metabolic modulator. It is not approved as a prescription medicine in the United States, European Union, or other major markets. Regulatory action has focused on its presence in sports and in products marketed as research chemicals. Because it has no accepted medical indication, supply is often unregulated. This status creates legal and safety uncertainties for anyone who encounters the substance.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
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.
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.
Transthoracic echocardiography is not recommended in the evaluation of aortic dissections owing to its limited ability to evaluate the aortic arch, the descending aorta or the blood vessels branching from the aorta. Its sensitivity may be further reduced in patients with obesity or lung emphysema. Transthoracic echocardiography has high sensitivity in evaluating the aortic root and proximal ascending aorta. It can also be done at bedside and no sedation is required. It may also identify complications of aortic dissection including heart failure, pericardial effusion with possible cardiac tamponade, and aortic valve regurgitation or other valve disorders. Transesophageal echocardiography has a sensitivity of 96.8% and specificity of 100% in the diagnosis of aortic dissections. It is also able to assess the descending aorta in the thorax. It can also assess the aortic valve and other heart valves, as well as assess the true lumen or false lumin of aortic dissections, which can help guide surgical repair planning and options. Transesophageal echocardiography requires the person to be sedated.
=== Psychotherapy === Long-term, consistent psychotherapy is the preferred method for treating BPD, and engagement in any therapeutic approach tends to surpass the absence of treatment, particularly in diminishing self-harm impulses. Among the effective psychotherapeutic approaches, dialectical behavior therapy (DBT), schema therapy, and psychodynamic therapies have shown efficacy, although improvements may require extensive time, often years of dedicated effort. Available treatments for BPD include dynamic deconstructive psychotherapy (DDP), mentalization-based treatment (MBT), schema therapy, transference-focused psychotherapy, dialectical behavior therapy (DBT), and general psychiatric management. The effectiveness of these therapies does not significantly vary between more intensive and less intensive approaches. Transference-focused psychotherapy is designed to mitigate absolutist thinking by encouraging individuals to express their interpretations of social interactions and their emotions, thereby encouraging more precise and flexible categorizations. Dialectical behavior therapy (DBT), on the other hand, focuses on developing skills in four main areas: interpersonal communication, distress tolerance, emotional regulation, and mindfulness, aiming to equip individuals with BPD with tools to manage intense emotions and improve interpersonal relationships.
== Description == The mushrooms are orange, yellow or white, meaty and funnel-shaped. On the lower surface, underneath the smooth cap, most species have rounded, forked folds that run almost all the way down the stipe, which tapers down seamlessly from the cap. Many species emit a fruity aroma, reminiscent of apricots, and often have a mildly peppery taste. Cantharellus pallens has sometimes been defined as a species in its own right, but it is normally considered to be just a variety (C. cibarius var. pallens). Unlike "true" C. cibarius it yellows and then reddens when touched and has a weaker smell. Eyssartier and Roux classify it as a separate species but say that 90% of the chanterelles sold in French markets are this, not C. cibarius. Similarly, the very pale C. alborufescens, which reddens easily and is found in Mediterranean areas, and northern of Iran is sometimes distinguished as a separate variety or a separate species.
== Mechanism == Cilostazol is a selective inhibitor of phosphodiesterase type 3 (PDE3) with therapeutic focus on increasing cAMP. An increase in cAMP results in an increase in the active form of protein kinase A (PKA), which is directly related with an inhibition in platelet aggregation. PKA also prevents the activation of an enzyme (myosin light-chain kinase) that is important in the contraction of smooth muscle cells, thereby exerting its vasodilatory effect.
=== Sightings === The investigation into the child's disappearance was slow to commence and soon slowed down further due to the lack of credible leads. Nevertheless, the case had sparked public interest to a degree that sightings of Mendonça were numerous over the years since his disappearance. A prostitute, Alcina Dias, confirmed that Afonso had taken Mendonça to see her on the day he disappeared. Dias allegedly drove up to see her in his car and asked her if she was working. When she assented, he offered to pay her to have sex with Mendonça. Alcina Dias said that Mendonça was extremely nervous and crying by the time he exited the vehicle, reportedly saying that Afonso had forced him to meet her. Alcina Dias added that she tried to calm the boy down and asked him if his mother knew he was there, to which the boy replied no. Mendonça then allegedly drove off in Afonso's vehicle. Alcina Dias allegedly tried to give her deposition to the authorities, but could never identify Dias by name. In 2011, she finally identified him in a court of law. In April 1998, the political commentator Nuno Rogeiro traveled to Disneyland Paris with his family. During the trip, the Rogeiro family snapped several photographs whilst on a ride; one of these photos depicts a boy sitting behind the family who reportedly looks remarkably like Mendonça. Sitting next to the boy was a man in his 40s wearing a red jacket. The Portuguese police did confiscate the photographs for further analysis, but no further progress was made regarding this sighting.
Sources: en.wikipedia.org
== Function == Resistin is a multifunctional hormone that plays critical roles in metabolic regulation, inflammation, and innate immunity. In humans, resistin is primarily expressed by immune cells such as monocytes and macrophages, where it acts as a pro-inflammatory cytokine by stimulating the production of cytokines including IL-6, IL-1β, and TNF-α through activation of signaling pathways involving the TLR4 and CAP1 receptors. Beyond its pro-inflammatory effects, resistin also demonstrates direct antimicrobial activity by damaging bacterial membranes, and it modulates immune responses by recruiting and activating immune cells, promoting chemokine production, and enhancing the formation of neutrophil extracellular traps (NETs). Notably, resistin exhibits bidirectional immunomodulatory properties: while it can amplify inflammation in response to certain stimuli, it can also attenuate excessive inflammatory responses triggered by bacterial products such as lipopolysaccharide (LPS), potentially by competing for TLR4 binding or directly neutralizing LPS. This dual functionality positions resistin as an important regulator of host defense and inflammatory balance in both health and disease.
== Synthesis == Fentanyl is a 4-anilinopiperidine class synthetic opioid. The synthesis of Fentanyl is accomplished by one of four main methods as reported in the scientific literature: the Janssen, Siegfried, Gupta, or Suh method.
=== Apodization in photography === Most camera lenses contain diaphragms which decrease the amount of light coming into the camera. These are not strictly an example of apodization, since the diaphragm does not produce a smooth transition to zero intensity, nor does it shape the intensity profile beyond the "top hat" transmission of its aperture. Some lenses use other methods to reduce the amount of light let in. For example, the Minolta/Sony STF 135mm f/2.8 T4.5 lens has a special design which accomplishes this by using a concave neutral-gray-tinted lens element as an apodization filter, thereby producing a pleasant bokeh. The same optical effect can be achieved by combining depth-of-field bracketing with multiple exposure, as implemented in the Minolta Maxxum 7's STF function. In 2014, Fujifilm announced a lens utilizing a similar apodization filter in the Fujinon XF 56mm F1.2 R APD lens. In 2017, Sony introduced the E-mount full-frame lens Sony FE 100mm F2.8 STF GM OSS (SEL-100F28GM) based on the same optical Smooth Trans Focus principle. Simulation of a Gaussian laser beam input profile is also an example of apodization. Photon sieves provide a relatively easy way to achieve tailored optical apodization.
The fourth-largest cargo airline worldwide, UPS Airlines flies to over 800 destinations worldwide (the most of any airline, cargo or passenger). Formed in 1988, the airline is headquartered in Louisville, Kentucky (home to Worldport, its worldwide air hub) with additional hubs in the United States located in Ontario, California, Dallas, Texas, Rockford, Illinois and Philadelphia. Outside of North America, a hub in Cologne, Germany services Europe; in Asia, UPS Airlines operates a facility in Hong Kong and two hubs in mainland China. Consisting of a fleet of nearly 300 aircraft (as of 2025), the airline competes directly against FedEx Express, facilitating air shipments by the company in over 200 countries and territories worldwide.
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 laboratories typically use LC-MS/MS to detect GW501516 and its metabolites in urine. The method is sensitive and can identify the compound at low concentrations. Detection depends on sample timing, metabolism, and the specific assay.