The short version of metabolite fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-12-20 and is reviewed periodically as new material appears.
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.
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.
Quality assessment for cardarine samples usually combines identity, purity, and impurity testing. Nuclear magnetic resonance spectroscopy and mass spectrometry can confirm molecular structure, while high-performance liquid chromatography estimates purity. Certificates of analysis from testing laboratories may list these results, but they do not establish safety or legality. In the absence of approved manufacturing, products sold online may contain the wrong compound, variable amounts, or unlisted contaminants. Independent verification is therefore central to analytical work and to interpreting any reported biological activity.
Laboratory detection of GW501516 commonly uses liquid chromatography coupled with tandem mass spectrometry. The method can identify the parent compound or its metabolites in urine and blood after sample cleanup. Protein precipitation, solid-phase extraction, or enzymatic hydrolysis may precede analysis, depending on the matrix. Reference standards are required for accurate quantification and confirmation. Because the compound is not approved, testing often occurs in anti-doping, forensic, or research settings rather than routine clinical care. Results are reported with limits of detection and quantification.
| Property | Value | Notes |
|---|---|---|
| Chemical class | PPARδ agonist | Not an anabolic steroid. |
| Common synonyms | GW501516, GW-1516 | Cardarine is an informal name. |
| Appearance | White to off-white powder | Typical for research-grade solid. |
| Solubility class | Poorly soluble in water; soluble in some organic solvents | Such as DMSO or ethanol in laboratory settings. |
| Typical storage temperature | Cool, dry, protected from light | Specific conditions vary by supplier and form. |
Sporting authorities added GW501516 to prohibited lists after it appeared in athlete samples and online markets. The World Anti-Doping Agency classifies it as a hormone and metabolic modulator, and its use can lead to an anti-doping rule violation. Some early laboratory work suggested effects on fatty acid oxidation and endurance-related metabolism in animals, but those findings do not establish safe or effective use in people. Reports of adverse events in humans are scarce and often anecdotal, which complicates risk assessment.
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.
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.
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.
=== Pre-RNA world: The ribose issue and its bypass === A different type of nucleic acid, such as peptide nucleic acid, threose nucleic acid or glycol nucleic acid, could have been the first to emerge as a self-reproducing molecule, later replaced by RNA. Larralde et al., say that "the generally accepted prebiotic synthesis of ribose, the formose reaction, yields numerous sugars without any selectivity". They conclude that "the backbone of the first genetic material could not have contained ribose or other sugars because of their instability", meaning that the ester linkage of ribose and phosphoric acid in RNA is prone to hydrolysis. Pyrimidine ribonucleosides and nucleotides have been synthesized by reactions which by-pass the free sugars, and are assembled stepwise using nitrogenous or oxygenous chemistries. Sutherland has demonstrated high-yielding routes to cytidine and uridine ribonucleotides from small 2 and 3 carbon fragments such as glycolaldehyde, glyceraldehyde or glyceraldehyde-3-phosphate, cyanamide and cyanoacetylene. A step in this sequence allows the isolation of enantiopure ribose aminooxazoline if the enantiomeric excess of glyceraldehyde is 60% or greater. This can be viewed as a prebiotic purification step. Ribose aminooxazoline can then react with cyanoacetylene to give alpha cytidine ribonucleotide. Photoanomerization with UV light allows for inversion about the 1' anomeric centre to give the correct beta stereochemistry.
=== Candidacy for mayorship of Porto Alegre in 2016 === In 2016, Melo was the candidate for the mayorship of PMDB, with state deputy Juliana Brizola, of the PDT, as the vice-mayoral candidate on the ticket. In the first round, they received 185,655 votes (25.93%). They came in second place behind Nelson Marchezan Júnior, and both qualified for the second round. Melo received a diverse array of support, including from the PCdoB, the PMN, and from the PV's candidate, Marcelo Chiodo, even as his party supported Marchezan Júnior. He also positioned himself as more to the left, announcing his support for the fight against PEC 241, which established a ceiling for public spending for twenty years in Brazil, also going against the national position of his party. Along with this, he affirmed his position against proposed laws inspired by Escola sem Partido, a conservative movement. Melo declared that he had an "identity of struggles" with the left, since he came from the "old MDB", as the party was the main political force against the military dictatorship. As a candidate, he had shown opposition against the privatization of public companies, such as DMAE, Procempa and Carris, and defended participatory budgeting. After a tense campaign with constant trading of accusations between him and Marchezan Júnior, Melo was defeated in the second round, receiving 262,601 votos (39.50%). After the election, on analyzing his defeat in an interview, Melo criticized the possibility that the MDB would become a part of his adversary's administration.
The name protein that he propose for the organic oxide of fibrin and albumin, I wanted to derive from [the Greek word] πρωτειος, because it appears to be the primitive or principal substance of animal nutrition. Mulder went on to identify the products of protein degradation such as the amino acid, leucine, for which he found a (nearly correct) molecular weight of 131 Da.
== Arrest and conviction == Archerd was arrested on July 27, 1967, in Los Angeles for a threefold murder. He was convicted of killing the following: Zella Archerd, his fourth wife (July 25, 1956, two months after their wedding); Burney Archerd, his nephew (September 2, 1961, in Long Beach); and Mary Brinker Post, his seventh wife (November 3, 1966). Others suspected to be victims of Archerd are: William Jones Jr. (October 12, 1947, in Fontana), Juanita Plum Archerd, his fifth wife (March 13, 1958, in Las Vegas); and Frank Stewart (March 17, 1960). All exhibited symptoms of hypoglycemia. Archerd was sentenced to death on March 6, 1968, for three of the murder cases. The medical personnel, law enforcement, and prosecution team were unaware of the availability of an accurate and sensitive assay for blood insulin levels developed years earlier by Rosalyn Yalow in collaboration with Solomon Berson working at the Bronx Veterans Administration Hospital. Instead, they presented some unproven laboratory evidence that, in retrospect, should not have been accepted in court. In December 1970, the death sentence was upheld by the California Supreme Court. In 1972, the sentence was instead changed to life imprisonment after a ruling by the United States Supreme Court. Archerd died of pneumonia in 1977 at the age of 65.
=== EC 1.6.3 With oxygen as acceptor === EC 1.6.3.1: NAD(P)H oxidase (H2O2-forming) EC 1.6.3.2: NAD(P)H oxidase (H2O-forming) EC 1.6.3.3: NADH oxidase (H2O2-forming) EC 1.6.3.4: NADH oxidase (H2O-forming) EC 1.6.3.5: renalase
Sources: en.wikipedia.org
=== Exercise === It is recommended that hypermobile individuals remain fit, to prevent pain and fatigue. Regular exercise and exercise that is supervised by a physician and physical therapist can reduce symptoms because strong muscles increase dynamic joint stability. Low-impact exercise such as closed kinetic chain exercises are usually recommended as they are less likely to cause injury when compared to high-impact exercise or contact sports. Hydrotherapy can also be a beneficial medium for muscle training. Some isometric exercises can also be beneficial. Coordination may be improved through balance exercises. High impact sports are not recommended.
EAS Sports Nutrition (formerly Experimental & Applied Sciences) was a distributor of creatine nutritional supplements with approximately 300 staff, annual sales exceeding $300 million, and offices/distributors in 54 countries.
== Early life and education == She was born on June 26, 1946, in Manhattan, New York City. She completed her undergraduate studies in biology, cum laude in 1970 from Bryn Mawr College in Pennsylvania.
===== Research ===== Research shows silkworm silk does not possess any inherent antibiotic characteristics, bio-mimicking mechanical properties, and can cause fatal respiratory allergic reactions in some people. A 2020 study found that recombinantly produced spider silk proteins self-assemble at the liquid-air interface of a standing solution, forming protein permeable, super strong and ultra flexible membranes. The unforced self-assembly creates a nanofibrilar membrane which supports cell growth. A confluent layer of human skin cells forms within three days, and would be suitable for direct delivery to a patient.
Sources: en.wikipedia.org
The team is launched into space on modified ballistic missiles and approaches the alien ship by stealth. Four of the avout destroy the ship's main weapon before dying in combat. The rest of the team boards the ship and temporarily pass out from breathing alien air. The narrative now parallelizes across multiple timelines. In one narrative, Fraa Jad awakens Erasmas and leads him through the ship toward the command center. Upon being discovered and attacked by alien soldiers, Fraa Jad detonates the neutron bombs. In another narrative, soldiers take Erasmas and Fraa Jad captive and bring them to parley with the leader of the peaceful faction. In the final narrative, Erasmas awakens in a hospital on the starship and learns that diplomatic negotiations are underway thanks to the successful destruction of the alien weapon. Erasmas is told that Fraa Jad died in an accident during the launch, contradicting the other narratives. It remains ambiguous which (or how many) of these contradictory narratives are real, or how the narratives have influenced each other. It is implied that some Millenarian avout are capable of operating simultaneously in multiple parallel timelines, and that the Millenarians had called the alien ship to Arbre to disrupt the subjugation of the Avout by the Sæcular Power. Erasmas attends a diplomatic summit where a funeral ceremony is held for those lost on both sides and a peace process begins between the aliens and the Arbrans. On Arbre itself, the Sæcular Power and the avout have agreed to cooperate as equal powers.
July 1971: The association "Choisir la cause des femmes" is created — with philosopher Simone de Beauvoir and lawyer Gisèle Halimi — to demand the repeal of the 1920 law criminalizing abortion. January 3, 1972: Law on parentage. It opens the right for the mother to challenge, under certain conditions, the presumption of the husband's paternity. January 3, 1972: Law on the stay-at-home mother's allowance. April 24, 1972: Decree applying Article 4 of Law 67-1176 of December 28, 1967, on birth control and repealing Articles L. 648 and L. 649 of the Public Health Code. July 13, 1972: Law establishing the general status of military personnel; access to military careers is not subject to sex-based discrimination. August 16, 1972: Decree on the specific status of the corps of national police inspectors, in which women are allowed to apply. December 22, 1972: Law affirming the principle of equal pay between genders. January 2, 1973: Law on the Labor Code, which updates it and includes provisions on women's work. January 9, 1973: Law amending and supplementing the French Nationality Code and concerning certain provisions related to French nationality; it notably authorizes the transmission of nationality by the mother to her child, whether the child is "legitimate or illegitimate." March 23, 1973: Decree establishing the special status of female military corps.
== Differentiation of conditions == Clinical attachment loss (CAL) is a critical parameter in periodontal diagnosis, as it reflects true periodontal tissue destruction. However, increased probing depth does not always indicate attachment loss. Conditions such as pseudopockets and gingival enlargement can mimic periodontal pockets clinically, leading to diagnostic confusion. This part of the article discusses CAL in comparison with pseudopockets and gingival enlargement, highlighting their pathogenesis, clinical features, and diagnostic significance.
Sources: en.wikipedia.org
Cardarine is commonly known as GW501516 or GW-1516. These names refer to the same synthetic compound. It is not a brand-name approved medicine.
No, cardarine is not a steroid. It is classified as a PPARδ agonist. Its structure and receptor target differ from anabolic steroids.
No regulatory agency has approved cardarine as a medicine. It was investigated in early research but development was discontinued. It is not available as a prescription drug.
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.