If you have been reading about Certificate of analysis 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 2026-04-27. 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.
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
Laboratory studies have examined GW501516 in cell cultures and rodents for conditions such as dyslipidemia, insulin resistance, and obesity. Some trials in humans were initiated, but development was discontinued after preclinical findings raised concerns about cancer in certain models. Those findings do not prove that the compound causes cancer in people, but they contributed to regulatory caution. Later reviews often describe the evidence as preliminary and insufficient for assessing long-term safety.
| 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.
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.
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.
== Clinical significance == Mutations in this gene have been associated with tardive dyskinesia (TD), an increased risk of hematotoxicity after exposure to benzene, and susceptibility to various forms of cancer. Altered expression of this protein has been seen in many tumors and is also associated with Alzheimer's disease (AD).
In Vienna, she arranges a threesome with Henry and Tender assistant Hayley Clay, and after helping discredit journalist James Dycker, who is investigating Tender’s payment laundering, CFO Whitney Halberstram promotes her to chief communications officer; she promotes Hayley in turn, but learns Hayley holds leverage from their recorded encounter. Yasmin dismisses Harper’s warnings that Tender is fraudulent but later relays concerns to Henry. After Whitney gives Henry a letter acknowledging their criminal exposure, Yasmin works with Lord Norton to shift political blame toward the Labour government while allowing Henry to front the company’s collapse, then resigns and later divorces him following his arrest and plea deal. She reconciles with Harper and transitions into political public relations with Norton's backing, cultivating Reform MP Sebastian Stefanowicz and throwing him a Paris fundraiser backed by foreign donors using UK shell companies; when Harper objects to the event’s guests and Yasmin’s use of escorts, including Hayley and her cousin Dolly, Yasmin defends her actions as pragmatic and transactional, and shows Harper a compromising recording of Eric with Dolly. The next morning, she repeatedly listens to her father’s final voicemail inviting her on the yacht.
=== Venom system morphology === Little is known about the venom and the venom apparatus of centipedes. Studies on venom gland described it as the cuticle and epidermis being turned inside out. The venom gland consists of many epithelial secretory units, each with its own excretory system that is shaped like valves. Centipedes of the order Scolopendromorpha have interspersed radial striated muscles between the secretory units, where one end connects to the lumen of the venom gland and the other end connects to peripheral muscles. These muscles may be used for the contraction and constriction of anthe gland during venom ejection. The venom glands of Scolopendridae species are elongated cylindrical shape, with the lumen spanning almost the entire length of the gland. The long span of the lumen likely allows greater control over the secretion of different venom components. The venom glands span along the outer curvature of trochanteroprefemur of each forcipule.
Sources: en.wikipedia.org
The ultrasound examination allows morphological changes in the kidneys in more detail. In addition to changes in size and shape, renal cysts, localized (focal) organ damage, water sac kidneys and urinary retention as well as tumors can also be visualized. Hardly defined (diffuse) organ changes are accompanied by changes in echogenicity, but can only rarely be assigned to defined diseases. Pulsed Wave Doppler" can also be used to detect circulatory disorders. Calcification (nephrocalcinosis) is also common in chronic kidney disease and can also be detected sonographically. Renal biopsy is not routinely used, but may be indicated in certain preliminary reports—for example, young Abyssinian cats with symptoms of kidney disease for the detection of amyloidosis. Although computed tomography and magnetic resonance imaging have very good detail recognition, they only play a subordinate role in veterinary medicine due to their high costs and limited availability.
=== Brand names === Buserelin is marketed by Sanofi-Aventis primarily under the brand names Suprefact, Suprefact Depot, and Suprecur. It is also available under a number of other brand names including Bigonist, Bucel, Buserecur, Fuset, Metrelef, Profact, Profact Depot, Supremon, and Zerelin. CinnaFact is a generic version of the medication that is produced by CinnaGen. Buserelin is marketed for use in veterinary medicine primarily under the brand name Receptal, but is also available under the brand names Buserol, Busol, Porceptal, and Veterelin.
== Occurrence == Uranium is a naturally occurring element found in low levels in all rock, soil, and water. It is the highest-numbered element found naturally in significant quantities on Earth and is almost always found combined with other elements. Uranium is the 48th most abundant element in the Earth's crust. The decay of uranium, thorium, and potassium-40 in Earth's mantle is thought to be the main source of heat that keeps the Earth's outer core in the liquid state and drives mantle convection, which in turn drives plate tectonics. Uranium's concentration in the Earth's crust is (depending on the reference) 2 to 4 parts per million, or about 40 times as abundant as silver. The Earth's crust from the surface to 25 km (15 mi) down is calculated to contain 1017 kg (2×1017 lb) of uranium while the oceans may contain 1013 kg (2×1013 lb). The concentration of uranium in soil ranges from 0.7 to 11 parts per million (up to 15 parts per million in farmland soil due to use of phosphate fertilizers containing uranium impurities), and its concentration in sea water is 3 parts per billion. Uranium is more plentiful than antimony, tin, cadmium, mercury, or silver, and it is about as abundant as arsenic or molybdenum. Uranium is found in hundreds of minerals, including:
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.
It binds and activates PPARδ, a nuclear receptor that influences gene expression related to fatty acid metabolism and energy balance. This mechanism has been studied mainly in animals and cell models, not established as a safe human therapy.