This is a working overview of Research chemical, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-04-14 and is reviewed periodically as new material appears.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a metabolic modulator. |
| Approved medical use | None in major jurisdictions | Not a registered drug. |
| Common test matrix | Urine | Most anti-doping samples use urine. |
| Typical detection method | LC-MS/MS | Detects parent compound and metabolites. |
| Reference standard storage | -20 °C, desiccated | Typical for analytical standards. |
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.
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.
A persistent misconception is that cardarine is a fat-burning drug or a safe alternative to anabolic steroids. No approved therapeutic product exists, and human safety data are limited. The tumor findings in rodents remain a central concern in scientific reviews. Products sold online may contain inaccurate labels, impurities, or different compounds entirely, which complicates any assessment of effects. Independent testing of such products has reported frequent mislabeling. For these reasons, discussions in the literature emphasize risks and unknowns rather than benefits.
Cardarine is not approved for human therapeutic use in any major jurisdiction. It appears on the World Anti-Doping Agency Prohibited List as a PPARδ agonist within the hormone and metabolic modulators category. Sports organizations test for it because it has been detected in athlete samples and seized products. Regulatory actions against marketed research chemical versions have occurred in several countries, though enforcement varies. Availability through unregulated channels complicates oversight.
Cardarine is frequently described as a fat-burning or endurance-enhancing supplement, but these claims exceed the available evidence. The compound is not a hormone, steroid, or selective androgen receptor modulator. Research articles discuss it as a tool compound for studying PPARδ biology, while anti-doping literature focuses on its abuse and detection. Quality of unapproved products is uncertain, and independent analyses have found impurities or incorrect labeling. Open questions include whether human cancer risk resembles that seen in rodents and how often non-athletes use the substance.
Cardarine has no approved therapeutic indication and is not marketed as a medicine. The World Anti-Doping Agency lists GW501516 as a prohibited substance at all times, covering both in-competition and out-of-competition periods. National laws vary: some countries treat it as an unapproved drug subject to import controls, while others have specific restrictions on sale for human consumption. It is often sold as a research chemical, a label that does not imply safety or legality. Enforcement actions have targeted online vendors and shipments.
Anti-doping laboratories identify GW501516 and related metabolites using liquid chromatography coupled with tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be analyzed. The method targets the parent compound and phase I and phase II metabolites, which extend the detection window. Because the substance is prohibited at all times, athletes can be tested outside competition. Detection limits and windows depend on the assay, sample type, and individual metabolism.
== Chemistry == Prednisolone is a synthetic pregnane corticosteroid closely related to its cognate prednisone, having identical structure save for two fewer hydrogens near C11. It is also known as δ1-cortisol, δ1-hydrocortisone, 1,2-dehydrocortisol, or 1,2-dehydrohydrocortisone, as well as 11β,17α,21-trihydroxypregna-1,4-diene-3,20-dione.
=== April === 2 April – Stand-up comedian Janey Godley wins the inaugural Billy Connolly Spirit of Glasgow Award at the Glasgow International Comedy Festival. 4 April – Data produced by Public Health Scotland indicated that one in three people referred with urgent suspicion of cancer are waiting longer than the target date of 62 days. 5 April – Police arrest former SNP chief executive Peter Murrell as part of their investigation into the party's finances, but release him without charge pending further investigation. 6 April – Following a trial at the High Court in Edinburgh, Kashif Anwar is convicted of the murder of his pregnant wife, Fawziyah Javed, who he pushed from a rocky outcrop on Arthur's Seat, during a holiday in Edinburgh in September 2021. He is sentenced to life imprisonment with a minimum term of 20 years. 7 April BBC News reports that Johnston Carmichael, the accountants who audit the SNP's accounts, have resigned from the role, citing a their decision to do so as having been taken following a review of their clients. The Unite union announces that around 1,300 offshore workers are to stage a 48-hour strike from 24 April over pa, affecting production at dozens of oil and gas platforms. Around 100 workers at Rosyth Dockyard belonging to Unite have voted to strike between 17 April and 10 July in a disagreement with their employers over pay. 8 April – SNP president Mike Russell tells The Herald newspaper he does not think Scottish independence can be achieved "right now", and that the party is facing its biggest crisis for 50 years.
HPTLC has also been used successfully in the separation of various lipid subclasses, with reproducible and promising results obtained for 20 different lipid subclasses. Numerous reports related to clinical medicine studies have been published in various journals. As a result, HPTLC is now strongly recommended for drug analysis in serum and other tissues.
== Sequence conservation and stability == Due to the prevalent and unwavering nature of rRNA across all organisms, the study of its resistance to gene transfer, mutation, and alteration without destruction of the organism has become a popular field of interest. Ribosomal RNA genes have been found to be tolerant to modification and incursion. When rRNA sequencing is altered, cells have been found to become compromised and quickly cease normal function. These key traits of rRNA have become especially important for gene database projects (comprehensive online resources such as SILVA or SINA) where alignment of ribosomal RNA sequences from across the different biologic domains greatly eases "taxonomic assignment, phylogenetic analysis and the investigation of microbial diversity." Examples of resilience:
Sources: en.wikipedia.org
=== Antiquity === Ancient Babylonian texts describe symptoms resembling migraine, which were believed to be caused by supernatural forces and were treated using spiritual or religious practices. A description consistent with migraine is contained in the Ebers Papyrus, written around 1500 BCE in ancient Egypt. Trepanation, a surgical procedure involving drilling or scraping an opening into the skull, has been practiced since the Neolithic period, although there is little evidence that it was specifically used to treat headaches or migraine. During the Greco-Roman era, explanations for migraine shifted from supernatural beliefs to the theory of the four humors. Writings from the Hippocratic school of medicine described the visual aura that can precede headache and noted that vomiting could provide partial relief. Headaches were thought to result from an imbalance of these bodily fluids. A description by Aretaeus of Cappadocia classified headaches into cephalalgia, cephalea, and heterocrania, while Galen of Pergamon adapted this latter term to produce "hemicrania", from which the modern word migraine is derived. He proposed that the pain arose from the meninges and blood vessels of the head. The mystical visions described by Hildegard von Bingen as "reflections of the living light", have been interpreted by some scholars as being consistent with the visual aura experienced during migraine attacks.
is the net fluid movement between compartments. By convention, outward force is defined as positive, and inward force is defined as negative. The solution to the equation is known as the net filtration or net fluid movement (Jv). If positive, fluid will tend to leave the capillary (filtration). If negative, fluid will tend to enter the capillary (absorption). This equation has a number of important physiologic implications, especially when pathologic processes grossly alter one or more of the variables. According to Starling's equation, the movement of fluid depends on six variables:
Structural biology is concerned with the structural analysis of biological material at every level of organization. During the 19th and early 20th centuries, structural studies were largely limited to structures visible to the naked eye or through magnifying glasses and light microscopes. In the 20th century, a variety of experimental techniques were developed to examine the 3D structures of biological molecules. The most prominent techniques are X-ray crystallography, nuclear magnetic resonance, and electron microscopy. The discovery of X-rays and their application to protein crystals transformed structural biology by allowing researchers to determine the three-dimensional structures of biological molecules in atomic detail. Likewise, NMR spectroscopy allowed information about protein structure and dynamics to be obtained. Finally, in the 21st century, electron microscopy also saw a drastic revolution with the development of more coherent electron sources, aberration correction for electron microscopes, and reconstruction software that enabled the successful implementation of high resolution cryo-electron microscopy, thereby permitting the study of individual proteins and molecular complexes in three-dimensions at angstrom resolution.
Different bat species have different diets, including insects, nectar, pollen, fruit and even vertebrates. Megabats are mostly fruit, nectar and pollen eaters. Due to their small size, high metabolism and rapid burning of energy through flight, bats must consume large amounts of food for their size. Insectivorous bats may eat over 120 percent of their body weight per day, while frugivorous bats may eat over twice their weight. They can travel significant distances each night, exceptionally as much as 38.5 km (24 mi) in the spotted bat (Euderma maculatum), in search of food. Bats may acquire water from the food they eat or drink from sources like lakes and streams, flying over the surface and dipping their tongues into the water. Bats as a group appear to be losing vitamin C synthesis. Such a loss was recorded in 34 bat species from six major families, both insect- and fruit-eating, with the cause being a single mutation inherited from a common ancestor. Vitamin C synthesis has been recorded in at least two species of bat, Leschenault's rousette (Rousettus leschenaultii) and the great roundleaf bat (Hipposideros armiger).
=== Detection in biological fluids === Clonazepam and 7-aminoclonazepam may be quantified in plasma, serum, or whole blood in order to monitor compliance in those receiving the drug therapeutically. Results from such tests can be used to confirm the diagnosis in potential poisoning victims or to assist in the forensic investigation in a case of fatal overdosage. Both the parent drug and 7-aminoclonazepam are unstable in biofluids, and therefore specimens should be preserved with sodium fluoride, stored at the lowest possible temperature and analyzed quickly to minimize losses.
Sources: en.wikipedia.org
Legal status varies by country, but cardarine is not approved as a medicine in major jurisdictions. It is often sold as a research chemical, a category that may not be lawful for human use. Buyers should check local laws and product labels carefully.
Anti-doping laboratories use LC-MS/MS to detect GW501516 and its metabolites, usually in urine. The method can identify the parent compound at low concentrations. Detection windows vary with dose and individual factors.
No, cardarine has no approved medical uses in major jurisdictions. Early research explored metabolic conditions, but those programs were discontinued. It is not a registered treatment for any disease.
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.