The short version of Anti-doping fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-01-27. Anything still debated is marked as such rather than presented as settled.
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.
Safety concerns emerged from long-term animal studies. In rodents given the compound for extended periods, researchers found an increased incidence of certain cancers, including liver and bladder tumors. These findings contributed to the discontinuation of clinical development. Whether similar risks apply to short-term or low-level exposure in humans is not established, and controlled human safety data are limited. The relevance of high-dose rodent carcinogenicity findings to human use remains a subject of debate.
Human trials of GW501516 were small and short in duration. They examined lipid levels, glucose handling, and other metabolic markers, but the programs were halted after the animal cancer findings. No approved therapeutic product exists, and published human data are insufficient for establishing long-term safety. Reports of use for athletic performance come mainly from non-clinical settings and cannot be verified through controlled trials. Independent testing of products sold as cardarine has found inconsistent purity and labeling.
Laboratory studies indicate that GW501516 activates PPARδ, a nuclear receptor involved in fatty acid oxidation and energy metabolism. In rodent experiments, treated animals often showed increased endurance and reduced fat mass. These effects were observed under controlled conditions and do not establish safe or effective use in humans. The exact dose-response relationship in humans remains poorly characterized. Species differences in metabolism can affect how results translate across animals and people.
| Property | Value | Notes |
|---|---|---|
| CAS Registry Number | 317318-70-0 | Unique identifier for the compound. |
| Chemical class | PPARδ agonist | Synthetic ligand for peroxisome proliferator-activated receptor delta. |
| Appearance | White to off-white solid | Typical form of research-grade material. |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water. |
| Typical storage | -20°C | Recommended for long-term storage of stock solutions. |
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.
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.
Laboratory detection of cardarine typically involves sample preparation followed by chromatographic separation and mass spectrometric identification. Urine is the most common matrix for anti-doping tests, though blood and hair have also been explored. Methods can target the parent compound or its metabolites, depending on the expected window of detection. Reference standards are required for accurate quantification. Matrix effects and dilution can influence results, so laboratories use internal standards and validation protocols. The exact detection window varies with dose, route, and individual metabolism.
A common misconception is that cardarine has been proven safe for human use. In reality, human clinical data are limited, and long-term animal studies have raised concerns about cancer. Another misconception is that it is a supplement or vitamin-like compound. It is a synthetic research chemical with no approved medical indication. Scientific discussion often focuses on its mechanism and detection rather than therapeutic use. Regulatory and anti-doping literature treats it primarily as a prohibited substance.
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
Cardarine is a common name for GW501516, a synthetic compound first described in the 1990s as a selective agonist of the peroxisome proliferator-activated receptor delta. It was studied in preclinical models for metabolic and cardiovascular conditions, but it has not been approved as a medicine in the United States, Europe, or other major jurisdictions. Retail products labeled as cardarine are generally research chemicals or supplements, not pharmaceutical formulations. Because human safety and efficacy data remain limited, regulatory agencies treat it as an unapproved substance rather than a therapeutic product.
Clinical development stopped after rodent studies showed tumors at multiple sites. Whether those findings predict human cancer risk remains an open question, but they led sponsors to discontinue programs. Human safety data are limited to small, short-term studies that were not designed to assess cancer risk. Reported effects in those studies included changes in blood lipids, but the evidence is insufficient for medical use. Long-term consequences of nonmedical use are not well characterized. Questions about dose, duration, and individual susceptibility remain unresolved.
Cardarine is a common name for GW501516, an investigational compound developed in the 1990s for metabolic conditions. It acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in lipid and energy metabolism. The compound is frequently mislabeled as a selective androgen receptor modulator, or SARM, but its molecular target is different. GW501516 reached early clinical testing before development was discontinued. It has no approved therapeutic use in any country. The name cardarine is not a formal international nonproprietary name.
==== Kidney problems ==== Kidney tests revealed that nine of the ten steroid users developed a condition called focal segmental glomerulosclerosis, a type of scarring within the kidneys. The kidney damage in the bodybuilders has similarities to that seen in morbidly obese patients, but appears to be even more severe.
=== Phototaxis and UV response === As well as aligning with magnetic fields, "Ca. M. multicellularis" demonstrates clear photophobic and phototactic behaviours. When the organism is subjected to short pulses of ultraviolet (UV) light from a fluorescence microscope, it stops moving forward and immediately begins to swim backwards. This escape movement lasts for several seconds before it returns to its normal trajectory.
==== Antigonadotropic effects ==== CPA has potent antigonadotropic effects via its progestogenic activity. It blunts the gonadotropin releasing hormone (GnRH)-induced secretion of gonadotropins, and accordingly, markedly suppresses circulating levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) at sufficiently high doses. Consequently, levels of progesterone, androstenedione, testosterone, DHT, and estradiol are also markedly lowered at sufficiently high dosages, while an elevation in sex hormone-binding globulin (SHBG) and prolactin levels is observed. The effective dosage of CPA for inhibition of ovulation in women, this being an antigonadotropic effect, is 1 mg/day. CPA alone has been found to suppress ovulation in 3 of 5 women at a dose of 0.5 mg/day and in 5 of 5 women at a dose of 1 mg/day in studies. Ovulation inhibition with 1–2 mg/day CPA in combination with 1–2 mg/day estradiol valerate as a birth control pill (brand name Femilar) occurred in 94.4% of 108 women during the third treatment cycle in one study and in almost 100% of 26 women over 12 treatment cycles in another study (except for one woman who ovulated during her first treatment cycle). Oral CPA has been studied at low dosages of 5 to 20 mg/day as a potential male hormonal contraceptive. A dosage of as low as 5 to 10 mg/day oral CPA has been found to suppress circulating testosterone levels in men by 50 to 70%.
=== Books === Wadden, Thomas A.; Van Itallie, Theodore B. (1992). Treatment of the Seriously Obese Patient. Guilford Press. Stunkard, Albert J.; Wadden, Thomas A. (1993). Obesity: Theory and Therapy (2nd ed.). Raven Press. Brownell, Kelly D.; Wadden, Thomas A. (1998). The LEARN Program for Weight Control: Special Medication Edition. American Health Publishing. Wadden, Thomas A.; Stunkard, Albert J. (2002). Handbook of Obesity Treatment. Guilford Press. Wadden, Thomas A.; Bray, George A. (2018). Handbook of Obesity Treatment (2nd ed.). Guilford Press.
Sources: en.wikipedia.org
Marshall (born 1944), American chemist, co-inventor of Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry Archer John Porter Martin (1910–2002), British physical chemist, 1952 Nobel Prize in Chemistry for the invention of partition chromatography Martinus van Marum (1750–1837), Dutch physician, inventor, scientist and teacher, which created the "large electricity machine" Elmer McCollum (1879–1967), American biochemist, known for work of diet on health Edwin McMillan (1907–1991), American physicist, the first to produce a transuranium element, neptunium, 1951 Nobel Prize in Chemistry Lise Meitner (1878–1968), Austrian and Swedish nuclear physicist instrumental in the discovery of nuclear fission Dmitri Ivanovich Mendeleev (1834–1907), Russian chemist, creator of the Periodic table of elements Maud Menten (1879–1960). Canadian biochemist known for early work on enzyme kinetics John Mercer (1791–1866), British dye and fabric chemist who developed mercerisation, a process for treating cotton Robert Bruce Merrifield (1921–2006), solid-phase chemist, 1984 Nobel Prize in Chemistry Julius Lothar Meyer (1830–1895), German chemist, one of the pioneers in developing the earliest versions of the periodic table of the chemical elements Viktor Meyer (1848–1897), German organic and inorganic chemist, known for work on vapour densities
== Clinical significance == The gastrointestinal wall can be affected in a number of conditions. An ulcer is something that's eroded through the epithelium of the wall. Ulcers that affect the tract include peptic ulcers and perforated ulcer is one that has eroded completely through the layers. The gastrointestinal wall is inflamed in a number of conditions. This is called esophagitis, gastritis, duodenitis, ileitis, and colitis depending on the parts affected. It can be due to infections or other conditions, including coeliac disease, and inflammatory bowel disease affects the layers of the gastrointestinal tract in different ways. Ulcerative colitis involves the colonic mucosa. Crohn's disease may produce inflammation in all layers in any part of the gastrointestinal tract and so can result in transmural fistulae. Invasion of tumours through the layers of the gastrointestinal wall is used in staging of tumour spread. This affects treatment and prognosis. The normal thickness of the small intestinal wall is 3–5 mm, and 1–5 mm in the large intestine. Focal, irregular and asymmetrical gastrointestinal wall thickening suggests a malignancy. Segmental or diffuse gastrointestinal wall thickening is most often due to ischemic, inflammatory or infectious disease.
== Inverse/reverse micelles == In a non-polar solvent, it is the exposure of the hydrophilic head groups to the surrounding solvent that is energetically unfavourable, giving rise to a water-in-oil system. In this case, the hydrophilic groups are sequestered in the micelle core and the hydrophobic groups extend away from the center. These inverse micelles are proportionally less likely to form on increasing headgroup charge, since hydrophilic sequestration would create highly unfavorable electrostatic interactions. It is well established that for many surfactant/solvent systems a small fraction of the inverse micelles spontaneously acquire a net charge of +qe or -qe. This charging takes place through a disproportionation/comproportionation mechanism rather than a dissociation/association mechanism and the equilibrium constant for this reaction is on the order of 10−4 to 10−11, which means about every 1 in 100 to 1 in 100 000 micelles will be charged.
Xi has said that "only socialism can save China." Xi has also declared socialism with Chinese characteristics to be the "only correct path to realize national rejuvenation." According to BBC News, while the CCP was perceived to have abandoned its communist ideology since it initiated economic reforms in the 1970s, Xi is believed by some observers to be more believing in the "idea of a communist project", and was described as a Marxist–Leninist by former Australian prime minister Kevin Rudd. Xi's emphasis on prioritizing ideology has included re-asserting the Party's goal of eventually realizing communism and reprimanding those who dismiss communism as impractical or irrelevant. Xi described the communist ideal as the "calcium" in a Party member's spine, without which the Party member would suffer the "osteoporosis" of political decay and be unable to stand upright.
=== Irrigation === Proper cleansing of a wound is critical in preventing infection and promoting healing of any wound. Irrigation is defined as constant flow of a solution over the surface of a wound. The goal of irrigation is not only to remove debris and potential contaminants from a wound, but also to assist in visual inspection of a wound and hydrate the wound. Irrigation is typically achieved with either a bulb or syringe and needle/catheter. The preferred solution for irrigation is normal saline which is readily accessible in the emergency department, although recent studies have shown no difference in emergency department infection rates when comparing normal saline to potable tap water. Irrigation can also be achieved with a diluted 1% povidone iodine solution, but studies have again shown no difference in infection rates when compared to normal saline. Irrigation with antiseptic solutions, such as non-diluted povidone iodine, chlorhexidine, and hydrogen peroxide is not preferred since these solutions are toxic to tissue and inhibit wound healing. The exact volume of irrigation used will vary depending on the appearance of the wound, although some sources have reported 50–100 mL of irrigation per 1 cm of wound length as a guideline.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.
No. Cardarine is not an anabolic steroid; it belongs to a different chemical class that targets PPARδ. Steroids act primarily through androgen receptors, while cardarine acts through a nuclear receptor involved in metabolism.
Some rodent studies reported increased endurance and changes in fat metabolism after cardarine exposure. Long-term studies in animals also raised concerns about cancer in certain tissues. Human trial data are limited, so these findings cannot be directly translated to people.
Rodent studies reported increased endurance and fat oxidation after GW501516 exposure. Long-term studies also found higher rates of some tumors, which led to halted development.