GW501516 raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-08-20. Anything still debated is marked as such rather than presented as settled.
GW501516 binds and activates PPARδ, a nuclear receptor that influences transcription of genes involved in fatty acid oxidation and energy use. Activation shifts some metabolic pathways in preclinical models, which is why the compound has been studied for lipid disorders and exercise-related endpoints. The exact downstream effects in humans are incompletely mapped. PPARδ is expressed in many tissues, including skeletal muscle, liver, and adipose tissue, so broad activation may have varied consequences. Researchers continue to examine how selective or partial activation might alter the balance between benefits and risks.
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.
Analytical laboratories typically identify cardarine and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is a common matrix in anti-doping testing, while blood and tissue may be used in research settings. Detection windows depend on the assay, the sample matrix, and the compound's metabolism. Because cardarine is extensively metabolized, laboratories often target specific metabolites to improve sensitivity and confirmation. Reference standards are required for reliable quantification. Method validation includes checks for selectivity, linearity, and carryover.
A persistent misconception is that cardarine is a fat-burning drug or a safe alternative to anabolic steroids. No approved therapeutic product exists, and human safety data are limited. The tumor findings in rodents remain a central concern in scientific reviews. Products sold online may contain inaccurate labels, impurities, or different compounds entirely, which complicates any assessment of effects. Independent testing of such products has reported frequent mislabeling. For these reasons, discussions in the literature emphasize risks and unknowns rather than benefits.
Cardarine is not approved for human therapeutic use in any major jurisdiction. It appears on the World Anti-Doping Agency Prohibited List as a PPARδ agonist within the hormone and metabolic modulators category. Sports organizations test for it because it has been detected in athlete samples and seized products. Regulatory actions against marketed research chemical versions have occurred in several countries, though enforcement varies. Availability through unregulated channels complicates oversight.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white solid | Typical form of reference material |
| Solubility | Low in water; soluble in DMSO | Used to prepare stock solutions |
| Typical storage | -20 °C, desiccated, protected from light | Common laboratory practice |
| Analytical method | LC-MS/MS | Detects parent compound and metabolites |
| Common test matrix | Urine or blood | Used in anti-doping analysis |
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.
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.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
Adalia Rose Williams, born December 10, 2006, was an American girl with progeria, who was a notable YouTuber and vlogger who shared her everyday life on social media. She died on January 12, 2022, at the age of 15. Amy Foose, born September 12, 1969, was an American girl with progeria, who died at the age of 16 on December 19, 1985. She was the sister of American automobile designer, artist, and TV star Chip Foose, who started a foundation in her name called Amy's Depot. The Progeria Research Foundation gives out The Amy Award every few years, in honor of Amy. Sammy Basso, born December 1, 1995, was an Italian biologist, activist and writer who studied progeria and campaigned to raise awareness of the disease; he died at the age of 28 on October 5, 2024. At the time of his death he was the longest-living survivor of the condition. Tiffany Wedekind, an internet influencer from Columbus, Ohio known as Tenacious Tiffany, is currently the oldest living person with progeria at 49. She also designs clothes, does yoga, involved in public speaking, amongst other things. She credits her positive attitude towards her longevity with the disease. She was also featured on TLC's show One Day In My Body.
=== Food, beverage and perfume analysis === Foods and beverages contain numerous aromatic compounds, some naturally present in the raw materials and some forming during processing. GC–MS is extensively used for the analysis of these compounds which include esters, fatty acids, alcohols, aldehydes, terpenes etc. It is also used to detect and measure contaminants from spoilage or adulteration which may be harmful and which is often controlled by governmental agencies, for example pesticides.
== Early life == Flay was born on December 10, 1964, in New York City, to Bill and Dorothy Barbara (McGuirk) Flay. He was raised on the Upper East Side of Manhattan. He is a fourth-generation Irish American and was raised Catholic, attending denominational schools. At age 8, Flay asked for an Easy-Bake Oven for Christmas. His father thought that a G.I. Joe would be more appropriate. Despite his father's objections, he received them both.
== History == Electron-capture dissociation (ECD) was developed in 1998 to fragment large proteins for mass spectrometric analysis. Because ECD requires a large amount of near-thermal electrons (<0.2eV), originally it was used exclusively with Fourier transform ion cyclotron resonance mass spectrometry (FTICR), the most expensive form of MS instrumentation. Less costly options such as quadrupole time-of-flight (Q-TOF), quadrupole ion trap (QIT) and linear quadrupole ion trap (QLT) instruments used the more energy-intensive collision-induced dissociation method (CID), resulting in random fragmentation of peptides and proteins. In 2004 Syka and Coon et al. announced the creation of ETD, a dissociation method similar to ECD, but using a low-cost, widely available commercial spectrometer. The first ETD experiments were run on a QLT mass spectrometer with an electrospray ionization (ESI) source.
Sources: en.wikipedia.org
=== Age-appropriate use === Nipples (teats) are typically subdivided by flow rate, with the slowest flow rate recommended for premature infants and infants with feeding difficulties. However, flow rates are not standardised and vary considerably between brands. When the infant is held in someone's arms while being bottle-fed, it receives physical contact, not as close as during breastfeeding, but more than when the bottle is given while lying in bed. Lying on its back, the infant is more likely to choke and misses out on the physical contact that is so important for its development. The NHS recommends a sippy cup or beaker be introduced by 6 months and the use of bottles discontinued by 1 year. The AAP recommends that the cup be introduced by one year of age and that the use of the bottle by discontinued by 18 months. The use of bottles is discouraged beyond two years of age by most health organisations as prolonged use can cause tooth decay. Early childhood caries (ECC) is also a concern when considering how long breastfeeding should continue.
== Pathophysiology == The thyroid gland is responsible for regulating whole-body metabolism through the production of two major hormones: thyroxine (T4) and triiodothyronine (T3). Of the metabolically active thyroid hormones, 93% is T4 and 7% is T3. T3 is four times more potent than T4 and most T4 is converted to T3 in the tissues. Iodine is necessary for adequate hormone production. Thyroid-stimulating hormone (TSH) is a circulating or serum hormone from the pituitary gland that stimulates the thyroid gland to produce T3 and T4. Hypothyroidism occurs when the thyroid gland does not produce enough T3 and T4. The most common cause of hypothyroidism worldwide is too little dietary iodine. Hashimoto's thyroiditis is the most common cause of hypothyroidism in countries with sufficient dietary iodine. With the cessation of the production of thyroid hormone, the thyroid gland contains enough reserve T3 and T4 to last 2 to 3 months. The thyroid hormones T3 and T4 influence the production by virtually all cells in the body of hundreds of new intracellular proteins and enzymes. This influence includes the expression of the calcium ATPase, regulation of ion channels, oxidative phosphorylation, increased Na-K-ATPase activity, increased carbohydrate metabolism, increased free fatty acids, increased vitamin requirements, and increased overall metabolism.
The Centre consistently supported Brüning's government and in 1932 vigorously campaigned for the re-election of Paul von Hindenburg, calling him a "venerate historical personality" and "the keeper of the constitution". Hindenburg was re-elected against Adolf Hitler, but shortly afterwards dismissed Brüning on 30 May 1932. President Hindenburg, advised by General Kurt von Schleicher, appointed the Catholic nobleman Franz von Papen as Chancellor, a member of the Centre's right wing and former cavalry captain. The intention was to break the connection of the Centre with the other republican parties or to split the party and integrate it into a comprehensive conservative movement. However, the Centre refused to support Papen's government in any way and criticised him for "distorting and abusing good old ideals of the Centre, acting as the representative of reactionary circles". Papen forestalled being expelled by leaving the party.
== Biology and biochemistry == S. haemolyticus is nonmotile, nonsporulating, facultatively anaerobic, and Gram-positive. Cells are typically coccus-shaped and range from 0.8 to 1.3 μm in diameter. It lives on a wide variety of substrates, including glucose, glycerol, maltose, sucrose, and trehalose. It also tests positive for acetoin production, arginine, dihydrolase, benzidine, catalase, hemolysis, and lipase; it tests negative for coagulase, DNase, ornithine decarboxylase and phosphatase
Hallucinogen antidotes such as the atypical antipsychotics risperidone, quetiapine, and olanzapine are trip killers that are used to block the effects of mescaline and other hallucinogenic drugs. Atypical antipsychotics are serotonin 5-HT2A receptor antagonists that directly block the effects of hallucinogens. The serotonin 5-HT2A receptor antagonist ketanserin has been found to block the psychoactive effects of mescaline. Similarly, the antipsychotic chlorpromazine, which acts as both a dopamine D2 receptor antagonist and to a lesser extent as a serotonin 5-HT2A receptor antagonist, has been reported to reverse the psychoactive effects of mescaline. Other phenothiazines, such as promethazine and diethazine, have also been reported to antagonize the effects of mescaline in humans, whereas prochlorperazine was much less effective and promazine was ineffective. Barbiturates, which are GABAA receptor positive allosteric modulators, have been found to reduce the anxiety induced by mescaline.
Sources: en.wikipedia.org
=== New Zealand === PCP was used in New Zealand as a timber preservative and antisapstain treatment, but since 1988 is no longer used. It was also sold as a moss killer to the general public (by Shell, at least) in the form of a 115g/L aqueous solution and labelled as a poison.
=== Energy drinks === High caffeine consumption in energy drinks (at least one liter or 320 mg of caffeine) was associated with short-term cardiovascular side effects including hypertension, prolonged QT interval, and heart palpitations. These cardiovascular side effects were not seen with smaller amounts of caffeine consumption in energy drinks (less than 200 mg).
=== Misinterpretation of "DTO" === The abbreviation "DTO," traditionally used to refer to Deodorized Tincture of Opium, is sometimes also erroneously employed to abbreviate "diluted tincture of opium." Diluted tincture of opium, also known as Camphorated Tincture of Opium (Paregoric) is a 1:25 mixture of opium tincture to water prescribed to treat withdrawal symptoms in newborns whose mothers were using opioids while pregnant. The United States Pharmacopeia and FDA recommend that practitioners refrain from using DTO in prescriptions, given this potential for confusion. In cases where pharmacists have misinterpreted DTO, and given "deodorized tincture of opium" when "diluted tincture of opium" was meant, infants have received a massive 25-fold overdose of morphine, sometimes resulting in fatalities.
==== Education ==== Duterte signed the Universal Access to Quality Tertiary Education Act in August 2017, providing free college education in all state universities and colleges nationwide. He signed a law establishing transnational higher education in the country, allowing foreign universities to offer degree programs in the Philippines in an effort to bring international quality standards and expertise into the country. He also signed medical scholarships for deserving students in state universities and colleges or partner private higher education institutions through the Doktor Para sa Bayan Act on December 23, 2020. Duterte approved in January 2021 a law institutionalizing the alternative learning system (ALS), providing free education to those out of school. In March 2022, he enacted a law granting inclusive education for learners with disabilities. On June 9, 2020, Duterte signed a law establishing the country's first National Academy of Sports in New Clark City, Capas, Tarlac.
Sources: en.wikipedia.org
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.
PPARδ is a nuclear receptor that regulates genes linked to fatty acid oxidation and energy metabolism. Activation can alter lipid handling and energy use in experimental models. The full range of effects in humans is still under study.
The solid compound is generally stable when kept cold, dry, and protected from light. Solutions may degrade faster, so laboratory protocols often specify fresh preparation or cold storage. Stability can depend on solvent, concentration, and container.
No. Cardarine has not received approval for human therapeutic use in major jurisdictions. It remains an investigational compound.