anti-doping raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-02-08. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| CAS Registry Number | 317318-70-0 | Unique identifier for the compound. |
| Chemical class | PPARδ agonist | Synthetic ligand for peroxisome proliferator-activated receptor delta. |
| Appearance | White to off-white solid | Typical form of research-grade material. |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water. |
| Typical storage | -20°C | Recommended for long-term storage of stock solutions. |
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.
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.
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.
On 3 January 1945, the 82nd Airborne Division conducted a counterattack. On the first day's fighting the 82nd Airborne overran the 62nd Volksgrenadiers and the 9th SS Panzer's positions capturing 2,400 prisoners. The 82nd Airborne suffered high casualties in the process. The attached 551st Parachute Infantry Battalion was all but destroyed during these attacks. Of the 826 men who went into the Ardennes, only 110 came out. Having lost its charismatic leader Lt. Colonel Joerg, and almost all its men either wounded, killed, or frostbitten, the 551 was never reconstituted. The few soldiers who remained were later absorbed into units of the 82nd Airborne. After several days of fighting, the destruction of the 62nd Volksgrenadiers, and what had been left of the 9th SS Panzer Division was complete. For the 82nd Airborne Division the first part of the Battle of the Bulge had ended.
Amorphous selenium has a low melting point, high vapor pressure, and uniform structure. These three properties allow quick and easy deposition of large-area uniform films with a thickness up to 1 mm at a rate of 1–5 μm/min. Their uniformity and lack of grain boundaries, which are intrinsic to polycrystalline materials, improve the X-ray image quality. Meanwhile the large area is essential for scanning the human body or luggage items. Selenium is less toxic than many compound semiconductors that contain arsenic or heavy metals such as mercury or lead. The mobility in applied electric field is sufficiently high both for electrons and holes, so that in a typical 0.2 mm thick device, c. 98% of electrons and holes produced by X-rays are collected at the electrodes without being trapped by various defects. Consequently, device sensitivity is high, and its behavior is easy to describe by simple transport equations.
== Regulation == Like other drugs, botanical drugs may be sold over the counter (OTC) or by prescription only. For OTC drugs, a monograph must be created by the company that wants to market the drug and then approved by the FDA, after which it is published in the Federal Register. For prescription drugs, a New Drug Application (NDA) must be filed with and approved by the FDA; clinical data included in the NDA is gathered under an Investigational New Drug Application which the FDA also must approve before clinical testing begins. Assessment of the safety and toxicity of botanical drugs in clinical trials, and in ensuring their quality once the drug is on the market, is complicated by the nature of the raw ingredients; problems arise in identifying the correct plants to harvest, in the quality of plants harvested, in their processing, and in the stability of the active components, which are often poorly understood. The FDA relies on a combination of tests and controls to ensure the identity and quality of botanical drugs. The tests include "fingerprinting" using spectroscopy or chromatography, chemical or biological assays, and process controls on raw material collection and processing. The standards are higher for botanical drugs than for extracts or plant matter used in dietary supplements. If the substance being developed as a botanical drug has been used in traditional medicine, it may be possible to begin initial, small clinical trials without conducting extensive toxicology testing.
Sources: en.wikipedia.org
=== June === 1 June – Mark Rocket becomes the first New Zealander to reach space after flying on the Blue Origin NS-32 suborbital spaceflight. 2 June: The 2025 King's Birthday Honours are announced. Notable recipients include comedian Dai Henwood, Suzy Cato, Louise Wallace and Jude Dobson. Australian mining company Siren Gold is granted a permit to explore gold and antimony in the Marlborough Sounds. 3 June: Online retailer Trade Me acquires a 50 percent stake in media company Stuff's Stuff Digital division. Former National Party minister and MP Steven Joyce becomes chair of media company NZME's board while Canadian billionaire Jim Grenon becomes the company's director following a board meeting. The 90,000 Pawprint Petition calling for a ban on the public sale of fireworks is presented to the New Zealand Parliament. WorkSafe New Zealand launches a new road cone online tipline. The Kaipara District Council confirms that Dargaville's water supply pipeline is fully repaired following four days of disruptions caused by four separate ruptures. 4 June – The navigation radar of HMAS Canberra's accidentally disrupts Internet service and radio signals over a large area spanning Taranaki in the North Island to the Marlborough District in the South Island. When made aware, Canberra's crew changed her systems to non-interfering frequencies. 5 June: Police charged three individuals with manslaughter in relation to the Loafers Lodge fire.
== Uniformity == The chemical processing and synthesis of high performance technological components for the private, industrial and military sectors requires the use of high purity ceramics, polymera, glass-ceramics, and composite materials. In condensed bodies formed from fine powders, the irregular sizes and shapes of nanoparticles in a typical powder often lead to non-uniform packing morphologies that result in packing density variations in the powder compact. Uncontrolled agglomeration of powders due to attractive van der Waals forces can also give rise to in microstructural inhomogeneities. Differential stresses that develop as a result of non-uniform drying shrinkage are directly related to the rate at which the solvent can be removed, and thus highly dependent upon the distribution of porosity. Such stresses have been associated with a plastic-to-brittle transition in consolidated bodies, and can yield to crack propagation in the unfired body if not relieved. In addition, any fluctuations in packing density in the compact as it is prepared for the kiln are often amplified during the sintering process, yielding inhomogeneous densification. Some pores and other structural defects associated with density variations have been shown to play a detrimental role in the sintering process by growing and thus limiting end-point densities. Differential stresses arising from inhomogeneous densification have also been shown to result in the propagation of internal cracks, thus becoming the strength-controlling flaws.
It also acquired the only copy of the 1507 Waldseemüller world map ("America's birth certificate") in 2003; it is on permanent display in the library's Thomas Jefferson Building. Using privately raised funds, the Library of Congress has created a reconstruction of Thomas Jefferson's original library. This has been on permanent display in the Jefferson building since 2008.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.
No. Cardarine is not an anabolic steroid; it belongs to a different chemical class that targets PPARδ. Steroids act primarily through androgen receptors, while cardarine acts through a nuclear receptor involved in metabolism.
Some rodent studies reported increased endurance and changes in fat metabolism after cardarine exposure. Long-term studies in animals also raised concerns about cancer in certain tissues. Human trial data are limited, so these findings cannot be directly translated to people.
It binds to and activates PPAR delta, a nuclear receptor that controls expression of genes related to fatty acid oxidation. This mechanism can alter energy metabolism in animal models. It is not a direct stimulant or fat-burning enzyme.