The short version of GW501516 fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-08-12. Anything still debated is marked as such rather than presented as settled.
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.
Products sold as cardarine have been found to contain incorrect compounds, variable amounts, or no active ingredient at all. Independent testing is required to verify identity and purity. Common analytical approaches include high-performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance for structural confirmation. These methods can distinguish GW501516 from related PPAR agonists and from unrelated steroids. For regulators and researchers, such verification is central to interpreting both biological results and adverse event reports.
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a metabolic modulator. |
| Approved medical use | None in major jurisdictions | Not a registered drug. |
| Common test matrix | Urine | Most anti-doping samples use urine. |
| Typical detection method | LC-MS/MS | Detects parent compound and metabolites. |
| Reference standard storage | -20 °C, desiccated | Typical for analytical standards. |
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.
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.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
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.
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.
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.
== See also == Bush tax cuts – Changes to the United States tax code during the Bush presidency Omnibus spending bill – Type of appropriations bill Tax reform – Method of changing compulsory fees or levies as part of broad economic programmes
=== Charities === Many charities use TikTok for fundraising and education, especially with younger audiences, charities using TikTok include; Oregon Zoo, Shelter, Battersea Dogs and Cats Home, British Red Cross, American Heart Association, United Way, Catskill Animal Sanctuary and the Black Country Living Museum. Some TikTok influencers run their own events to raise money for charitable causes e.g. Mercury Stardust runs the TikTok-A-Thon for Trans Healthcare. 'TikTok For Good' was created by TikTok to support fundraising on the platform. In 2019, TikTok announced the #EduTok Mentorship program, a live workshop series in the Indian states of Bihar, Andhra Pradesh, Telangana, Rajasthan, Jharkhand and Jammu inspired by the hashtag #EduTok, in which video creators present factually for purposes of education. In 2022, TikTok banned fundraising for political accounts.
High affinity copper uptake protein 1 (CTR1) is a transmembrane protein that is encoded by the SLC31A1 gene in humans. Copper is an element essential for life, but excessive copper can be toxic or even lethal to the cell. Therefore, cells have developed sophisticated ways to maintain a critical copper balance, with the intake, export, and intracellular compartmentalization or buffering of copper strictly regulated. The 2 related genes ATP7A and ATP7B, responsible for the human diseases Menkes syndrome and Wilson disease, respectively, are involved in copper export. In S. cerevisiae, the copper uptake genes CTR1, CTR2, and CTR3 have been identified, and in human the CTR1 and CTR2 (MIM 603088) genes have been identified.
== Complications == OSA is a serious medical condition with systemic effects; patients with untreated OSA have a greater mortality risk from cardiovascular disease than those undergoing appropriate treatment. The organs, which are affected the most by oxygen deprivation, are the brain and the kidneys. Other complications include hypertension, congestive heart failure, atrial fibrillation, coronary artery disease, stroke, and type 2 diabetes. Daytime fatigue and sleepiness, a common symptom of sleep apnea, is also an important public health concern regarding transportation crashes caused by drowsiness. OSA may also be a risk factor of COVID-19. People with OSA have a higher risk of developing severe complications of COVID-19. Alzheimer's disease and severe obstructive sleep apnea are connected because there is an increase in the protein beta-amyloid as well as white-matter damage. These are the main indicators of Alzheimer's, which in this case comes from the lack of proper rest or poorer sleep efficiency resulting in neurodegeneration. Having sleep apnea in mid-life brings a higher likelihood of developing Alzheimer's in older age, and if one has Alzheimer's then one is also more likely to have sleep apnea. This is demonstrated by cases of sleep apnea even being misdiagnosed as dementia. With the use of treatment through CPAP, there is a reversible risk factor in terms of the amyloid proteins. This usually restores brain structure and cognitive impairment. Evidence continues to be found supporting there is an association between BMI and Alzheimer's.
Sources: en.wikipedia.org
== Synthesis == HMX is more complicated to manufacture than most explosives, and this confines it to specialist applications. It and RDX are both produced by the Bachmann process—nitration of hexamine using a mixture of ammonium nitrate and nitric acid in a mixture of acetic acid and acetic anhydride as solvent—with the major product determined by the specific reaction conditions.
=== GGQ catalytic site === The catalytic site that is responsible for the hydrolysis of the peptidyl tRNA is the GGQ site on eRF1. Current understanding of the GGQ site states that it enters the P-site of the ribosome, which is where the peptidyl tRNA is located, after a conformational change caused by the hydrolysis of GTP by eRF3. Furthermore, any mutation to the GGQ site renders eRF1 nonfunctional, thus the cells ability to successfully terminate Translation. This is due to the two glycine residues in GGQ to adopt a torsional angle that is only possible with two glycines. Without the proper angle, the active site for the reaction won't be able to function properly. In order nascent protein to be released the GGQ site needs to recruit a water molecule into the active site of the reaction. The method of recruitment for a single water molecule is still not understood completely. Once in position, the water molecule acts as a nucleophile, and attacks the carbonyl group of the ester bond between the nascent protein and the tRNA. The hydrolysis of the ester bond causes the release of the nascent protein and the disassembly of the ribosome and termination complex.
=== Illustrative example === The following describes the operation of a simple mass spectrometer that uses sector type. Other types are treated below. Consider a sample of sodium chloride (table salt). In the ion source, the sample is vaporized (turned into gas) and ionized (transformed into electrically charged particles) into sodium (Na+) and chloride (Cl−) ions. Sodium atoms and ions are monoisotopic, with a mass of about 23 daltons (symbol: Da or older symbol: u). Chloride atoms and ions come in two stable isotopes with masses of approximately 35 u (at a natural abundance of about 75 percent) and approximately 37 u (at a natural abundance of about 25 percent). The analyzer part of the spectrometer contains electric and magnetic fields, which exert forces on ions traveling through these fields. The speed of a charged particle may be increased or decreased while passing through the electric field, and its direction may be altered by the magnetic field. The magnitude of the deflection of the moving ion's trajectory depends on its mass-to-charge ratio. Lighter ions are deflected by the magnetic force to a greater degree than heavier ions (based on Newton's second law of motion, F = ma). The streams of magnetically sorted ions pass from the analyzer to the detector, which records the relative abundance of each ion type. This information is used to determine the chemical element composition of the original sample (i.e. that both sodium and chlorine are present in the sample) and the isotopic composition of its constituents (the ratio of 35Cl to 37Cl).
He even sent letters to the ruler of Multan, the Byzantine emperors Constantine VII and Michael IV the Paphlagonian, Jewish communities and Christian Church leaders, as well as the leader of the Qarmatians of Bahrayn, either admonishing them for having abandoned the true faith, or exhorting them to repent and convert before the imminent end times.
Under the theory that federal law, passed pursuant to Constitutional authority, overrules conflicting state laws, federal authorities still claim the authority to seize, arrest, and prosecute for possession and sales of these substances, even in states where they are legal under state law. The first wave was the legalization by 27 states of laetrile in the late 1970s. This drug was used as a treatment for cancer, but scientific studies both before and after this legislative trend found it ineffective. The second wave concerned medical marijuana in the 1990s and 2000s. Though Virginia passed legislation allowing doctors to recommend cannabis for glaucoma or the side effects of chemotherapy, a more widespread trend began in California with the Compassionate Use Act of 1996. When the FDA requested Endo Pharmaceuticals on June 8, 2017, to remove an extended-release formulation of oxymorphone hydrochloride from the market, it was the first request in FDA history to recall an effective drug over its potential for misuse. In February 2025, FDA food division head Jim Jones quit in protest of the "indiscriminate" layoffs of 89 staff members by the Donald Trump administration. In May 2025, the FDA announced changes in its COVID-19 vaccine policy, intending to limit approved indications use for adults over 65 and individuals at higher risk of complications in the fall. For healthy Americans younger than 65, the agency indicated it would likely require additional clinical trials with placebo controls to demonstrate benefit before approving wider access.
Sources: en.wikipedia.org
=== General ethical issues === If the creation of human DNA through artificial gene synthesis were to become technically feasible, several ethical and social issues have been identified by researchers. Scholars such as Adrian Villalba and Anna Smajdor have noted that synthetic DNA may challenge existing assumptions about the nature and significance of human genetic material. One area of concern involves the concept of genetic ownership. If a person’s DNA sequence can be artificially recreated in the laboratory, it becomes unclear who holds rights or control over the resulting material, and whether current legal and ethical frameworks are adequate to address such cases. There are also questions about identity. Human genomes have traditionally been viewed as closely linked to personal identity and biological heritage. However, the possibility of reconstructing or redesigning genomic sequences through synthetic DNA would significantly weaken this association. If genomes can be created, modified, or replicated independently of natural inheritance, the view that genetic makeup rigidly determines personal traits becomes increasingly difficult to sustain. In this context, synthetic DNA is proposed as effectively undermining genetic determinism and prompting a re-evaluation of assumptions about the role of genes in shaping individual identity. Privacy is another significant issue. The possibility of synthesizing sequences identical or similar to those of existing individuals raises concerns about genetic data protection and potential misuse.
== Occurrence == Mentha arvensis (wild mint) is the primary species of mint used to make natural menthol crystals and natural menthol flakes. Menthol occurs naturally in peppermint oil (along with a little menthone, the ester menthyl acetate and other compounds), obtained from Mentha × piperita (peppermint). Japanese menthol also contains a small percentage of the 1-epimer neomenthol.
=== Clinical trials === A phase II study was conducted comparing the safety and efficacy of omadacycline to linezolid for the treatment of complicated skin and skin structure infections. Patients were randomized at 11 sites in the US to receive either omadacycline 100 mg intravenously once daily with an option to transition to 200 mg orally once daily or linezolid 600 mg intravenously twice daily with an option to transition to 600 mg orally twice daily. The results indicated that omadacycline is well tolerated and has the potential to be an effective treatment in patients with complicated skin and skin structure infections. In June 2013, the US Food and Drug Administration (FDA) designated the intravenous and oral formulations of omadacycline as a qualified infectious disease product in the treatment of acute bacterial skin and skin structure infections and community-acquired bacterial pneumonia. A 650-patient phase III registration study comparing omadacycline to linezolid for the treatment of acute bacterial skin and skin structure infections began in June 2015. Omadacycline met the primary efficacy endpoint of early clinical response with statistical non-inferiority (10% margin) compared to linezolid, and was generally safe and well tolerated. The most common treatment-emergent adverse events were gastrointestinal side effects (18.0% for omadacycline vs. 15.8% for linezolid). A 750-patient phase III study comparing omadacycline to moxifloxacin for the treatment of community-acquired bacterial pneumonia began in November 2015.
=== National AI Strategy (2021) === The UK Government's National AI Strategy, was published in September 2021 under the Conservative government of Boris Johnson. It set out a ten-year plan structured around three pillars: investing in the long-term needs of the AI ecosystem; supporting the adoption of AI across all sectors of the economy; and establishing an effective governance framework that ensures AI is safe, ethical, and trustworthy. The strategy identified the UK's world-class universities, research base, and existing technology cluster as competitive advantages to be leveraged.
=== Clinical social work === Social workers provide a variety of services, generally concerned with social problems, their causes, and their solutions. With specific training, clinical social workers may also provide psychological counseling (in the US and Canada), in addition to more traditional social work.
Sources: en.wikipedia.org
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.
Anti-doping laboratories use LC-MS/MS to detect GW501516 and its metabolites, usually in urine. The method can identify the parent compound at low concentrations. Detection windows vary with dose and individual factors.
No, cardarine has no approved medical uses in major jurisdictions. Early research explored metabolic conditions, but those programs were discontinued. It is not a registered treatment for any disease.
Anti-doping and clinical laboratories commonly use liquid chromatography-tandem mass spectrometry. The method can identify GW501516 and its metabolites in urine or blood. Detection depends on sample timing and the amount present.