metabolite is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-01-23. Numbers and descriptions here follow the published literature rather than marketing material.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
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.
Anti-doping laboratories detect GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be used in some programs. Detection depends on factors such as dose, timing, metabolism, and the sensitivity of the assay. Published methods describe limits of detection in the low nanogram per milliliter range for related compounds. Exact detection windows are not fixed for all situations and remain an area of ongoing study.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516, GW-501516, GW 501516, endurobol | Names vary in research and anti-doping documents. |
| Chemical class | Synthetic PPARδ agonist | Small-molecule nuclear receptor ligand. |
| CAS Registry Number | 317318-70-0 | Identifier commonly associated with GW501516. |
| Appearance | White to off-white powder | Typical for purified research material. |
| Solubility | Low in water; soluble in DMSO and ethanol | Organic solvents are common for laboratory stock solutions. |
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.
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.
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.
Regulatory bodies treat GW501516 as a prohibited substance in competitive sport. The World Anti-Doping Agency added it to the prohibited list, and it falls under classes covering metabolic modulators and hormone-related agents. It is not approved by drug regulators for human use, and it is not a lawful dietary supplement. Products sold under the cardarine name may contain unlisted ingredients or different compounds. Because no approved product exists, quality and identity are not guaranteed by pharmaceutical manufacturing standards.
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.
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.
==== Mollusks ==== In cephalopods, the models used for the studies of cartilage are Octopus vulgaris and Sepia officinalis. The cephalopod cranial cartilage is the invertebrate cartilage that shows more resemblance to the vertebrate hyaline cartilage. The growth is thought to take place throughout the movement of cells from the periphery to the center. The chondrocytes present different morphologies related to their position in the tissue. The embryos of S. officinalis express ColAa, ColAb, and hyaluronan in the cranial cartilages and other regions of chondrogenesis. This implies that the cartilage is fibrillar-collagen-based. The S. officinalis embryo expresses hh, whose presence causes ColAa and ColAb expression and is also able to maintain proliferating cells undiferentiated. It has been observed that this species presents the expression SoxD and SoxE, analogs of the vertebrate Sox5/6 and Sox9, in the developing cartilage. The cartilage growth pattern is the same as in vertebrate cartilage. In gastropods, the interest lies in the odontophore, a cartilaginous structure that supports the radula. The most studied species regarding this particular tissue is Busycotypus canaliculatus. The odontophore is a vesicular cell rich cartilage, consisting of vacuolated cells containing myoglobin, surrounded by a low amount of extra cellular matrix containing collagen. The odontophore contains muscle cells along with the chondrocytes in the case of Lymnaea and other mollusks that graze vegetation.
Woven bone is produced when osteoblasts produce osteoid rapidly, which occurs initially in all fetal bones, but is later replaced by more resilient lamellar bone. In adults, woven bone is created after fractures or in Paget's disease. Woven bone is weaker, with a smaller number of randomly oriented collagen fibers, but forms quickly; it is for this appearance of the fibrous matrix that the bone is termed woven. It is soon replaced by lamellar bone, which is highly organized in concentric sheets with a much lower proportion of osteocytes to surrounding tissue. Lamellar bone, which makes its first appearance in humans in the fetus during the third trimester, is stronger and filled with many collagen fibers parallel to other fibers in the same layer (these parallel columns are called osteons). In cross-section, the fibers run in opposite directions in alternating layers, much like in plywood, assisting in the bone's ability to resist torsion forces. After a fracture, woven bone forms initially and is gradually replaced by lamellar bone during a process known as "bony substitution". Compared to woven bone, lamellar bone formation takes place more slowly. The orderly deposition of collagen fibers restricts the formation of osteoid to about 1 to 2 μm per day. Lamellar bone also requires a relatively flat surface to lay the collagen fibers in parallel or concentric layers.
I wanted Glenn to know, so I went to his bedside and told him. I thought I saw a gleam in his eye, but the next day when I went to visit him he didn't remember seeing me. As a scientist, he had died when he had that stroke. Seaborg died two months later, on 25 February 1999. In March 1999, the same team replaced the 244Pu target with 242Pu to make other flerovium isotopes. Two atoms of flerovium were produced as a result, each alpha-decaying with a half-life of 5.5 s. They were assigned as 287Fl. This activity has not been seen again either, and it is unclear what nucleus was produced. It is possible that it was an isomer 287mFl or from electron capture by 287Fl, leading to 287Nh and 283Rg.
Sources: en.wikipedia.org
Le Havre Official website (in French) Official tourism website Archived 23 December 2018 at the Wayback Machine Le Havre Information website (Archive) Le Havre on Lion1906 Slave streets of Le Havre; article on the slave trade here in 17th and 18th century Le Havre on Géoportail, National Geographic Institute (IGN) website (in French) Texts on Wikisource: "Havre, Le". Encyclopædia Britannica. Vol. 11 (9th ed.). 1880. pp. 527–528. "Havre, Le". Encyclopædia Britannica. Vol. 13 (11th ed.). 1911. pp. 83–84. "Havre". The American Cyclopædia. 1879. "Havre". The New Student's Reference Work. 1914. "Havre". Collier's New Encyclopedia. 1921.
The plant is stemless and usually produces several rosettes consisting of wiry, lax, grasslike, flattened leaves. Leaves, up to 1 meter long and 12mm wide (3+1⁄3 feet x ~1⁄2 inch), have margins bearing many small, close-together, skin-cutting teeth. Inflorescences are panicle type and up to 35cm long (~14 inches) atop scapes up to 70cm tall (~2+1⁄3 feet) Flowers are functionally male or female, the males with larger stamens, the females with better developed pistils, but both types have both stamens and pistils. Flowers have six yellow-green tepals up to 2.5mm long (~2+1⁄3 inch) Fruits are winged, slightly inflated capsules up to 10 mm tall and 11mm wide (~1⁄3 inch).
=== From mechanical blood processing during surgery === In some surgical procedures (especially some heart operations) where substantial blood loss is expected, machinery is used for intraoperative blood salvage. A centrifuge process takes blood from the patient, washes the red blood cells with normal saline, and returns them to the patient's blood circulation. Hemolysis may occur if the centrifuge rotates too quickly (generally greater than 500 rpm)—essentially this is hemolysis occurring outside of the body. Increased hemolysis occurs with massive amounts of sudden blood loss, because the process of returning a patient's cells must be done at a correspondingly higher speed to prevent hypotension, pH imbalance, and a number of other hemodynamic and blood level factors. Modeling of fluid flows to predict the likelihood of red cell membrane rupture in response to stress is an active area of research.
Sources: en.wikipedia.org
== GLP-1 and neuropeptide Y multi-agonists == In 2023, researchers disclosed the discovery of multiple peptides that activated the GLP-1 receptor, neuropeptide Y receptor Y1, and neuropeptide Y receptor Y2. Since neuropeptide Y receptors were a previous anti-obesity target, it is hoped that the combination might be more efficacious than GLP-1 receptor agonists.
The Chinese People's Armed Police Coast Guard Bureau, also abbreviated as China Coast Guard is the agency for maritime search and rescue and law enforcement in the territorial waters of the People's Republic of China. The China Coast Guard was formerly the maritime branch of the People's Armed Police (PAP) Border Security Force under the Ministry of Public Security until 2013. In March 2013, China announced it would form a unified Coast Guard commanded by the State Oceanic Administration. This renewed Coast Guard has been in operation since July 2013. As of 1 July 2018, the China Coast Guard was transferred from civilian control of the State Council and the State Oceanic Administration, to the People's Armed Police, ultimately placing it under the command of the Central Military Commission (CMC). According to Joel Wuthnow of the Institute for National Strategic Studies, the Coast Guard Command within the People's Armed Police possibly is of Corps Leader Grade, led by a Commandant who usually holds the rank of major general. In June 2018, China Coast Guard was granted maritime rights and law enforcement akin civilian law enforcement agencies in order to carry out contrast of illegal activities, keep peace and order, as well as safeguarding security at sea, when performing duties related to the use of marine resources, protection of marine environment, regulation of fishery, and anti-smuggling. There are currently 3 regional bureaus:
=== Academic Health Center and UC Health (1980s-Present) === The medical school and health colleges had been referred to as the "University of Cincinnati Medical Center" from the early 1980s until 2005. In 2000 a fourth College, the College of Allied Health Sciences joined the University of Cincinnati Medical Center. In 2005, the name was changed from the University of Cincinnati Medical Center to the University of Cincinnati Academic Health Center. In 2010, the Academic Health Center (AHC) became part of the newly formed UC Health organization. UC Health was formed after the dissolution of the Health Alliance of Greater Cincinnati, which had operated the University of Cincinnati Medical Center from 1994 to 2010 and also operated West Chester Hospital starting in 2009. The 2010 dissolution of the alliance left the university with 100% ownership so the alliance was renamed to UC Health and placed under a parent company named UC Healthcare System.
A dipeptide is an organic compound derived from two amino acids. The constituent amino acids can be the same or different. When different, two isomers of the dipeptide are possible, depending on the sequence. Several dipeptides are physiologically important, and some are both physiologically and commercially significant. A well known dipeptide is aspartame, an artificial sweetener.
Sources: en.wikipedia.org
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.
No. Cardarine is not a steroid hormone; it targets the nuclear receptor PPARδ. Its classification in anti-doping rules differs from anabolic steroids, though it remains prohibited in sport.
Early rodent studies reported tumor formation at multiple sites, which raised safety concerns. Sponsors stopped clinical development, and no approved human product exists.
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.