If you have been reading about Preclinical research and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-07-02. Numbers and descriptions here follow the published literature rather than marketing material.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
GW501516 acts on PPARδ, a nuclear receptor that helps regulate fatty acid oxidation and energy homeostasis. In animal studies, activation of this receptor was associated with increased endurance and changes in lipid metabolism. Human trials examined effects on blood lipids and other metabolic markers, but the compound did not advance to approval. Rodent studies later reported tumors in multiple tissues at doses used in those experiments. Whether those findings translate to human risk remains uncertain, and the clinical relevance of the animal data is still debated.
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.
| Property | Value | Notes |
|---|---|---|
| Common name | Cardarine | Common internet and media name. |
| Research code | GW501516 | Also written GW-1516. |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator. |
| Development status | Discontinued | Clinical development halted after rodent cancer findings. |
| Regulatory status | Prohibited in sport | Listed by WADA; not approved as medicine. |
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.
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.
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.
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.
=== Dolly Bird === Dolly Bird (Skye Degruttola) is an escort who Eric hires. She is later revealed to be from the same agency as Hayley Clay, her cousin. Dolly's sexual encounter with Eric was secretly recorded, and the video is sent to him alongside Dolly's passport showing her to be only 15 years old. The blackmail compels Eric to dissolve his partnership with Harper to protect her and the firm. Yasmin subsequently hires Hayley and Dolly to seduce and extort powerful men around the world, bringing them with her to a political fundraiser in Paris attended by illegal foreign donors. Harper is horrified at Dolly's presence after Yasmin shows her the video of Dolly with Eric, and attempts to convince Dolly to leave with her, but Dolly and Hayley rebuff her.
Containers with hard spouts date to early in recorded time, as evidence by archeological finds (see image). The first vessels known to be used for feeding infants had an opening at one end for filling the bottle, and a second at the other to be put into the baby's mouth. Examination of the organic residues on ancient ceramic baby bottles shows that they were used as early as 1200 BCE to feed babies with animal milk. Around 250 BCE to 300 BCE the Egyptians developed the ability to blow glass and the Romans blew clear feeding bottles of glass, but these did not obtain long-term popularity. Leather and wood were also used. By the 1700s infant-feeding vessels such as the feeding-cups, bubby-pots, and sucking-pots were also being made from materials that included pewter, tin, and silver.
for an n electron process. Focusing on current, reversible couples are characterized by ipa/ipc = 1. When a reversible peak is observed, thermodynamic information in the form of a half cell potential E01/2 can be determined. When waves are semi-reversible (ipa/ipc is close but not equal to 1), it may be possible to determine even more specific information (see electrochemical reaction mechanism). The current maxima for oxidation and reduction itself depend on the scan rate, see the figure.
Sources: en.wikipedia.org
Temporary halogenation with bromine to a trans‑1,2‑dibromoalkane: the regeneration of the alkene then follows with preservation of conformation via elemental zinc or with titanocene dichloride. Protection through a Diels-Alder reaction: the transformation of an alkene with a diene leads to a cyclic alkene, which is nevertheless similarly endangered by electrophilic attack as the original alkene. The cleavage of a protecting diene proceeds thermically, for the Diels-Alder reaction is a reversible (equilibrium) reaction.
== Formation == Two enzymes are needed to release tuftsin from immunoglobulin G.First, the spleen enzyme tuftsin-endocarboxypeptidase nicks the heavy chain at the Arg-Glu bond (292-293). The arginine carboxy-terminal is now susceptible to the action of the second enzyme, carboxypeptidase β. The leukokinin-S so nicked is present in tissues and blood, free or bound to outer membrane of the appropriate phagocyte. The membrane enzyme leukokininase acts on the bound leukokinin-S to cleave it at the amino end of threonine between residues 288 and 289 (-Lys-Thr-). Free tuftsin is biologically active. The phagocytic cell plays a unique role in releasing its own activator. Leukokininase can be found on the outer membrane of phagocytic cells: blood neutrophil leukocytes of human and dog, rabbit peritoneal granulocyte. It is a highly active enzyme with pH optimum:6.8.
== Medical uses == Velmanase alfa is indicated for the treatment of the non-central nervous system manifestations of alpha-mannosidosis. Alpha-mannosidosis is a rare genetic lysosomal storage disorder. The symptoms of the disorder vary, but often include mild to moderate intellectual disability, hearing loss, weakened immune system, distinctive facial features (e.g., a large head, prominent forehead, and protruding jaw), skeletal abnormalities, and muscle weakness. Alpha-mannosidosis is caused by genetic changes in the MAN2B1 gene, which codes for the lysosomal alpha-mannosidase enzyme. Mutations of the MAN2B1 gene result in the lack of production of the alpha-D-mannosidase enzyme or the production of a defective, inactive form of the enzyme. Alpha-mannosidosis affects about 1 in every 500,000 people worldwide.
Sources: en.wikipedia.org
No. Cardarine is a PPARδ agonist, while selective androgen receptor modulators act on androgen receptors. The two classes differ in receptor target and downstream effects.
Preclinical rodent studies reported cancers, including liver and bladder tumors, at tested doses. The human relevance of those findings is uncertain, but development was discontinued. No approved human product resulted.
No. It remains an investigational compound without approved therapeutic labeling. Sports regulators prohibit its use, and health agencies have warned against consuming it.
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.