This is a working overview of PPARδ agonist, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-07-26. Anything still debated is marked as such rather than presented as settled.
A common misconception is that cardarine has been proven safe for human use. In reality, human clinical data are limited, and long-term animal studies have raised concerns about cancer. Another misconception is that it is a supplement or vitamin-like compound. It is a synthetic research chemical with no approved medical indication. Scientific discussion often focuses on its mechanism and detection rather than therapeutic use. Regulatory and anti-doping literature treats it primarily as a prohibited substance.
Cardarine is explicitly prohibited by the World Anti-Doping Agency under the class of PPARδ agonists. Its presence in urine or blood samples can be detected using mass spectrometry-based methods, often liquid chromatography-tandem mass spectrometry. Athletes who test positive may face sanctions, including bans from competition. The compound is also regulated as a prescription-only or unapproved drug in many countries. Enforcement varies by jurisdiction, and some regions treat it as a controlled substance. Online sales may occur despite these restrictions, creating quality and legal risks.
Laboratory detection of cardarine typically involves sample preparation followed by chromatographic separation and mass spectrometric identification. Urine is the most common matrix for anti-doping tests, though blood and hair have also been explored. Methods can target the parent compound or its metabolites, depending on the expected window of detection. Reference standards are required for accurate quantification. Matrix effects and dilution can influence results, so laboratories use internal standards and validation protocols. The exact detection window varies with dose, route, and individual metabolism.
PPARδ is a nuclear receptor that influences transcription of genes involved in fatty acid oxidation, lipid transport, and energy homeostasis. GW501516 binds and activates this receptor with high selectivity relative to PPARα and PPARγ in laboratory assays. Activation alters expression of target genes in skeletal muscle, liver, and adipose tissue in animal models. The exact clinical consequences of these changes in humans remain incompletely characterized, and observed effects in animals do not establish therapeutic benefit or safety.
Published studies have examined GW501516 in animal models of obesity, insulin resistance, and exercise endurance. Early human trials reportedly ended, and development was discontinued after preclinical findings raised concerns about cancer in some rodent studies. Regulatory agencies have not approved cardarine for any medical use. Its availability through non-pharmaceutical channels raises questions about identity, purity, and legal status that are separate from its laboratory pharmacology. Those questions are often addressed through analytical testing rather than assumptions about product labels.
Cardarine is a common name for GW501516, also GW-1516, a synthetic compound developed as a peroxisome proliferator-activated receptor delta (PPARδ) agonist. It belongs to a class of agents that modulate gene transcription related to lipid and energy metabolism. The compound was studied in preclinical and early clinical research for metabolic and cardiovascular conditions, but it did not progress to approved therapeutic use. Its name appears in fitness and sports contexts despite not being approved as a drug.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a PPARδ agonist. |
| Typical detection matrix | Urine | Most common sample for anti-doping analysis. |
| Common analytical method | LC-MS/MS | Liquid chromatography-tandem mass spectrometry. |
| Common synonyms | GW501516, GSK-516, endurobol | Names found in research and fitness contexts. |
| Typical detection window | Variable | Depends on dose, route, and individual metabolism. |
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.
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 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.
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.
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.
Sulfuric acid (American spelling and the preferred IUPAC name) or sulphuric acid (Commonwealth spelling), known in antiquity as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen, and hydrogen, with the molecular formula H2SO4. It is a colorless, odorless, and viscous liquid that is miscible with water. Pure sulfuric acid does not occur naturally due to its strong affinity to water vapor; it is hygroscopic and readily absorbs water vapor from the air. Concentrated sulfuric acid is a strong oxidant with powerful dehydrating properties, making it highly corrosive towards other materials, from rocks to metals. Phosphorus pentoxide is a notable exception in that it is not dehydrated by sulfuric acid but, to the contrary, dehydrates sulfuric acid to sulfur trioxide. When sulfuric acid is added to water, a considerable amount of heat is released; thus, the reverse procedure of adding water to the acid is generally avoided since the heat released may boil the solution, spraying droplets of hot acid during the process. Upon contact with body tissue, sulfuric acid can cause severe acidic chemical burns and secondary thermal burns due to dehydration. Dilute sulfuric acid is substantially less hazardous without the oxidative and dehydrating properties. Nonetheless, it must be handled with care due to its acidity. There are many methods for producing sulfuric acid, including the contact process, the wet sulfuric acid process, and the lead chamber process. It can be obtained by dissolving sulfur trioxide in water.
=== Charterism === In line with Seekings's latter point, some historians have assigned a central role to the rise of what was known by 1984 as Charterism: adherence to the Freedom Charter, the anti-apartheid political manifesto adopted at the 1955 Congress of the People (and subsequently banned by the apartheid state). After a period of dormancy inside the country while Black Consciousness ideology predominated, Charterism had been revived from around 1979. On some accounts, this revival was partly the result of the interest of young people, and COSAS, certainly, was fiercely Charterist. Although the UDF had not yet formally adopted the Freedom Charter, many of its affiliates and leaders, while usually identifying implicitly with the ANC, identified explicitly with the Charter; and the growth of the UDF contributed to the spread of Charterism. According to Raymond Suttner:A whole generation had grown up without access to literature about the Congress movement. This is not to say that the memory was wiped out, but there was a rupture, organisationally, in terms of symbols and also in the free and widespread diffusion of values. The UDF reconnected people to that tradition...Widespread subscription to the principles of the Freedom Charter, in turn, may have partly inspired the uprising, particularly insofar as the Freedom Charter provided a framework for "linking everyday grievances to aspirations for a new society" or, in other words, for the identification of "the intersection between localised grievances and the strategies and ideology of the ANC".
O-GlcNAc transferase is part of a dynamic competition for a serine or threonine hydroxyl functional group in a peptide unit. Figure 3 shows an example of both reciprocal same-site occupancy and adjacent-site occupancy. For the same-site occupancy, OGT competes with kinase to catalyze the glycosylation of the protein instead of phosphorylation. The adjacent-site occupancy example shows the naked protein catalyzed by OGT converted to a glycoprotein, which can increase the turnover of proteins such as the tumor repressor p53. The post-translational modification of proteins by O-GlcNAc is spurred by glucose flux through the hexosamine biosynthetic pathway. OGT catalyzes attachment of the O-GlcNAc group to serine and threonine, while O-GlcNAcase spurs sugar removal. This regulation is important for multiple cellular processes including transcription, signal transduction, and proteasomal degradation. Also, there is competitive regulation between OGT and kinase for the protein to attach to a phosphate group or O-GlcNAc, which can alter the function of proteins in the body through downstream effects. OGT inhibits the activity of 6-phosophofructosekinase PFKL by mediating the glycosylation process. This then acts as a part of glycolysis regulation. O-GlcNAc has been defined as a negative transcription regulator in response to steroid hormone signaling. Studies show that O-GlcNAc transferase interacts directly with the Ten eleven translocation 2 (TET2) enzyme, which converts 5-methylcytosine to 5-hydroxymethylcytosine and regulates gene transcription.
But being doomed seldom sounded so beautiful." AllMusic's Heather Phares viewed III as the duo's "most serious set of songs yet" and stated, "Artistic progress is as much about subtraction as it is about addition, and on III, Crystal Castles have made room to be sad, angry, pretty, and danceable at the same time." Pitchfork's Ian Cohen dubbed III "the duo's most focused record", adding, "While not as immediately striking as either Crystal Castles (I or II), the streamlined sound allows more maneuverability and subtle variety in the actual songwriting." Matt James of PopMatters wrote, "Perennial outsiders to the death, Crystal Castles' third act is inspiring, warped, feverishly uncomfortable, bold, bloody and brilliant." Dan Pfleegor of Consequence of Sound opined that "III is less playful than the duo's previous couple of offerings, but its thematic mood is much tighter and more fully realized." The Guardian's Tim Jonze noted that "witch house is an obvious influence [on the album], and you could question whether the former chip-tune terrorists are still as ahead of the curve as they once were. It hardly matters when they can come up with stuff like 'Child I Will Hurt You', a dream-state lullaby that is both beautiful and unbearably sorrowful." Simon Price of The Independent stated that the album "shudders and shimmers like some massive, monstrous machine.
Sources: en.wikipedia.org
It is now known that organic compounds can be conductors, semiconductors, and insulators, thus one of the main opportunities in nanomaterials science is to use organic synthesis and molecular design to make electronically useful structures. Structural motifs in these systems include colloids, small crystals, and aggregates on the order of 1-100 nm. By function Nanostructured materials can also be classed according to their functions, for example nanoelectronics and information technology (IT). Lateral dimensions used in information storage are shrinking from the micro- to the nanoscale as fabrication technologies improve. Optical materials are important in the development of miniaturized information storage because light has many advantages for storage and transmission over electronic methods. Quantum dots - most commonly CdSe nanoparticles having diameters of tens of nm, and with protective surface coatings - are notable for their ability to fluoresce over a broad range of the visible spectrum, with the controlling parameter being size. By structure Certain structural classes are especially relevant to nanoscience. As the dimensions of structures become smaller, their surface area-to-volume ratio increases. Much like molecules, nanostructures at small enough scales are essentially "all surface". The mechanical properties of materials are strongly influenced by these surface structures. Fracture strength and character, ductility, and various mechanical moduli all depend on the substructure of the materials over a range of scales.
=== Related species === Cod forms part of the common name of many other fish no longer classified in the genus Gadus. Many are members of the family Gadidae; others are members of three related families within the order Gadiformes whose names include the word "cod": the morid cods, Moridae (100 or so species); the eel cods, Muraenolepididae (four species); and the Eucla cod, Euclichthyidae (one species). The tadpole cod family (Ranicipitidae) has now been placed in Gadidae.
TP-003 is an anxiolytic drug with a novel chemical structure, which is used in scientific research. It has similar effects to benzodiazepine drugs, but is structurally distinct and so is classed as a nonbenzodiazepine anxiolytic. TP-003 is a positive allosteric modulator at the benzodiazepine binding site of GABAA receptors. It possesses relative selectivity for benzodiazepine sites on α3-containing GABAA receptors, which are thought to contribute to the anxiolytic effects of benzodiazepines (in tandem with those containing α2 subunits). It has modest anticonvulsant activity although less than that of diazepam.
Sources: en.wikipedia.org
Yes, WADA prohibits cardarine as a PPARδ agonist. It appears on the prohibited list and can be detected in urine or blood. Athletes using it risk sanctions.
Detection usually uses liquid chromatography-tandem mass spectrometry after sample cleanup. Laboratories look for the parent compound or metabolites. The method requires validated reference standards and controls.
Legality varies by country. In many places it is an unapproved drug and cannot be legally sold for human consumption. Purchasing from online vendors carries legal and quality risks.
Cardarine is commonly known as GW501516 or GW-1516. These names refer to the same synthetic compound. It is not a brand-name approved medicine.