A practical reference on LC-MS/MS: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-09-30 and is reviewed periodically as new material appears.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
Activation of PPARδ changes transcription of genes involved in fatty acid transport, mitochondrial function, and skeletal muscle fuel preference. In rodent studies, pharmacological PPARδ activation was associated with increased endurance and altered body composition. These findings generated interest in performance enhancement, but species differences and study designs limit direct extrapolation to humans. Small human trials were conducted in the 2000s and later discontinued. The extent to which cardarine produces similar metabolic or performance effects in people remains an open question.
At the molecular level, GW501516 binds and activates PPARδ, a nuclear receptor that regulates transcription. Activation shifts expression of genes involved in fatty acid oxidation, energy expenditure, and lipid transport in skeletal muscle and liver. Animal studies report increased endurance and altered lipid profiles after exposure. Human data are limited to small trials and do not establish long-term safety or efficacy. PPARδ also has roles in cell proliferation, so the relationship between activation and cancer risk remains an open question.
Published literature on cardarine includes in vitro assays, rodent experiments, and a small number of human studies. Reports describe effects on exercise capacity and lipid metabolism in animals, while human evidence is sparse. Many online descriptions present the compound as a proven endurance aid, a claim not supported by regulatory approval or large clinical trials. Analytical studies focus on identifying the parent compound and its metabolites in biological samples. Important uncertainties include species differences, dose-response relationships, and the relevance of rodent tumor findings to humans.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic PPARδ agonist | Not a steroid or a selective androgen receptor modulator. |
| Common synonyms | Cardarine, GW501516, GW-501516, endurobol | Names vary by supplier and literature source. |
| Appearance | White to off-white powder | Consistent with many small-molecule research chemicals. |
| Solubility | Low in water; soluble in DMSO and ethanol | Often prepared in organic solvent for laboratory work. |
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid and energy metabolism. |
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.
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.
In the fitness and bodybuilding literature, cardarine is frequently discussed as an endurance agent or fat-loss compound, although such claims are not supported by robust clinical evidence. Online descriptions often mix animal data, user anecdotes, and marketing language. Researchers who study PPARδ agonists distinguish between receptor activation in controlled experiments and unsupervised use of unverified products. The latter introduces unknown purity, dose, and interactions, making reported experiences difficult to interpret scientifically.
In Africa, European colonial governments and European Christian missionaries criminalized and stigmatized the cultural practices of tattooing and scarification; consequently, the practices underwent decline, ended, or continued to be performed as acts of resistance. Among the ethnic groups in sub-Saharan Africa that traditionally practice scarification are the Gonja, Dagomba, Frafra, Mamprusi, Nanumba, Bali, Tɔfin, Bobo, Montol, Kofyar, Yoruba, and Tiv people of West Africa, and the Dinka, Nuer, Surma, Shilluk, Toposa, Moru, Bondei, Shambaa, Barabaig, and Maasai people of East Africa.
In 1920, Hermann Staudinger published his seminal work "Über Polymerisation", in which he proposed that polymers were in fact long chains of atoms linked by covalent bonds. His work was debated at length, but eventually it was accepted by the scientific community. Because of this work, Staudinger was awarded the Nobel Prize in 1953. After the 1930s polymers entered a golden age during which new types were discovered and quickly given commercial applications, replacing naturally-sourced materials. This development was fuelled by an industrial sector with a strong economic drive and it was supported by a broad academic community that contributed innovative syntheses of monomers from cheaper raw material, more efficient polymerisation processes, improved techniques for polymer characterisation and advanced, theoretical understanding of polymers.
Wild birds impact many human activities, while domesticated birds are important sources of eggs, meat, feathers, and other products. Applied and economic ornithology aim to reduce the ill effects of problem birds and enhance gains from beneficial species.
=== In children === While type 1 diabetes is more prevalent in pediatric diabetes, type 2 diabetes has increasing prevalence, accounting for some 33% of new diagnoses. Risk factors for type 2 diabetes include ethnicity, family history, sedentary lifestyle, unhealthy diet, a mother with gestational diabetes, female gender, and obesity. Children with type 2 diabetes have increased risk of developing complications, which include insulin resistance, hyperglycemia, polyuria, ketosis, and dehydration. Early recognition, screening, treatment, and education of diabetic children are needed to prevent long-term disease complications. Screening for type 2 diabetes typically starts at 10 years old for obese children and those who have at least two risk factors. Diagnostic criteria include plasma blood glucose of more than 200 mg per deciliter (dl) or a fasting blood glucose above 126 mg per dl in children with overt symptoms. Differentiating type 1 from type 2 diabetes may include assessment of fasting blood insulin or C-peptide, or determination of autoantibodies for type 1 diabetes.
Sources: en.wikipedia.org
"It really got to them," recalls Dr. William Schneider Jr., [former] undersecretary of state for military assistance and technology, who saw classified "after-action reports" that indicated U.S. flight activity. "They didn't know what it all meant. A squadron would fly straight at Soviet airspace, and other radars would light up and units would go on alert. Then at the last minute the squadron would peel off and return home." From the accounts of CIA and senior KGB officers, by May 1981, obsessed with historical parallels with the 1941 German invasion and Reaganite rhetoric, and with no defensive capability against the Pershing IIs, Soviet leaders believed the United States was preparing a secret nuclear attack on the USSR and initiated Operation RYaN. Under this, agents abroad monitored service and technical personnel who would implement a nuclear attack so as to be able either to preempt it or have mutually assured destruction. On 1 September 1983, the Soviet military shot down a South Korean passenger jet, Korean Air Lines Flight 007, that had strayed into Soviet airspace. All 269 people aboard the aircraft were killed, including U.S. Representative Larry McDonald and many other Americans. The first Pershing II missiles were delivered to West Germany on 1 December 1983. Bruce G. Blair, an expert on Cold War nuclear strategies and former president of the World Security Institute in Washington, D.C., says the American–Soviet relationship at that time:
Parathyroid hormone regulates serum calcium through its effects on bone, kidney, and the intestine: In bone, PTH enhances the release of calcium from the large reservoir contained in the bones. Bone resorption is the normal destruction of bone by osteoclasts, which are indirectly stimulated by PTH. Stimulation is indirect since osteoclasts do not have a receptor for PTH; rather, PTH binds to osteoblasts, the cells responsible for creating bone. Binding stimulates osteoblasts to increase their expression of RANKL and inhibits their secretion of osteoprotegerin (OPG). Free OPG competitively binds to RANKL as a decoy receptor, preventing RANKL from interacting with RANK, a receptor for RANKL. The binding of RANKL to RANK (facilitated by the decreased amount of OPG available for binding the excess RANKL) stimulates osteoclast precursors, which are of a monocyte lineage, to fuse. The resulting multinucleated cells are osteoclasts, which ultimately mediate bone resorption. Estrogen also regulates this pathway through its effects on PTH. Estrogen suppresses T cell TNF production by regulating T cell differentiation and activity in the bone marrow, thymus, and peripheral lymphoid organs. In the bone marrow, estrogen downregulates the proliferation of hematopoietic stem cells through an IL-7-dependent mechanism. In the kidney, around 250 mmol of calcium ions are filtered into the glomerular filtrate per day. Most of this (245 mmol/d) is reabsorbed from the tubular fluid, leaving about 5 mmol/d to be excreted in the urine.
==== Assisted death in Canada ==== A lethal dose of propofol is used for medical assistance in dying in Canada to induce deep coma and death quickly, but rocuronium is always given as a paralytic, ensuring death, even when the patient has died as a result of an initial propofol overdose.
Sources: en.wikipedia.org
== Research == Wadden’s research has focused on the behavioral and medical management of obesity. His early work on very low-calorie diets (VLCDs) included the first long-term trial of high-protein VLCDs, showing short-term efficacy but frequent weight regain, which underscored the need for long-term maintenance strategies. In the 1990s, he helped establish methods for evaluating commercial weight-loss programs, contributing to federal consumer-protection efforts. Beginning in the late 1990s, Wadden’s trials demonstrated that combining weight-loss medications with intensive lifestyle intervention (ILI) produced greater weight reduction than either approach alone, shaping clinical guidelines and drug trial designs. He also played a central role in research that supports the Centers for Medicare and Medicaid Services reimbursement of intensive behavioral therapy (IBT) for obesity. His studies showed that brief, protocol-driven IBT sessions delivered in primary care produced clinically meaningful weight loss. As a principal investigator on the NIH-funded Look AHEAD trial, Wadden helped show that ILI improved cardiometabolic risk factors, physical function, quality of life, and health-care costs in patients with type 2 diabetes, despite not reducing cardiovascular events. More recently, he has reported on glucagon-like peptide-1 (GLP-1) medications such as semaglutide and tirzepatide, which produce substantial weight loss and health benefits.
: deflection offset AFM allows us to obtain a high-resolution image of multiple types of surfaces while the tip of the cantilever can be used to obtain information about mechanical properties. Computer simulations are also being progressively used to test theories and complement experimental studies. The most used computer method is molecular dynamics simulation, which uses Newton's equations of motion for the atoms or molecules in the system. Other techniques such direct probe method are used to determine the adhesive properties of nanomaterials. Both the technique and simulation are coupled with transmission electron microscope (TEM) and AFM techniques to provide results. Mechanical properties of common nanomaterials classes: Crystalline metal nanomaterials: Dislocations are one of the major contributors toward elastic properties within nanomaterials similar to bulk crystalline materials. Despite the traditional view of there being no dislocations in nanomaterials. Ramos, experimental work has shown that the hardness of gold nanoparticles is much higher than their bulk counterparts, as there are stacking faults and dislocations forming that activate multiple strengthening mechanisms in the material. Through these experiments, more research has shown that via nanoindentation techniques, material strength; compressive stress, increases under compression with decreasing particle size, because of nucleating dislocations. These dislocations have been observed using TEM techniques, coupled with nanoindentation.
The Library of Congress, through both the librarian of Congress and the register of copyrights, is responsible for authorizing exceptions to Section 1201 of Title 17 of the United States Code as part of the Digital Millennium Copyright Act. This process is done every three years, with the register receiving proposals from the public and acting as an advisor to the librarian, who issues a ruling on what is exempt. After three years have passed, the ruling is no longer valid and a new ruling on exemptions must be made.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist. It is not a steroid or a selective androgen receptor modulator. It was developed and studied as a research compound for metabolic pathways.
It binds to and activates PPARδ, a nuclear receptor that regulates genes related to fatty acid oxidation and energy use. This activation alters transcription in tissues such as skeletal muscle and liver. The full range of downstream effects in humans is not fully established.
No, cardarine is not known to occur naturally in plants, animals, or humans. It is a synthetic molecule produced for laboratory research. Products labeled as cardarine should therefore be treated as manufactured chemicals with variable purity.
Cardarine is a common name for the investigational compound GW501516. It acts as a PPARδ agonist and is not approved for human use. It is prohibited in sport.