This is a working overview of Metabolite, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-02-11 and is reviewed periodically as new material appears.
Preclinical research reported that GW501516 increased running endurance in mice and improved lipid profiles in some animal species. Early human trials explored effects on high-density lipoprotein cholesterol, triglycerides, and glucose handling, but the program was discontinued. Published human data are sparse and do not establish efficacy for any condition. Studies also examined PPAR delta in cancer biology, with conflicting findings across models. The relationship between receptor activation, tissue context, and disease risk remains an active area of investigation.
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
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.
Cardarine is explicitly prohibited by the World Anti-Doping Agency under the class of PPARδ agonists. Its presence in urine or blood samples can be detected using mass spectrometry-based methods, often liquid chromatography-tandem mass spectrometry. Athletes who test positive may face sanctions, including bans from competition. The compound is also regulated as a prescription-only or unapproved drug in many countries. Enforcement varies by jurisdiction, and some regions treat it as a controlled substance. Online sales may occur despite these restrictions, creating quality and legal risks.
| Property | Value | Notes |
|---|---|---|
| Molecular target | PPAR delta (NR1C2) | Ligand-activated nuclear receptor. |
| Primary tissues studied | Skeletal muscle, liver, adipose | Effects on fatty acid oxidation and energy use. |
| Typical detection matrix | Urine | Used in anti-doping analysis. |
| Common analytical method | LC-MS/MS | Detects parent compound and metabolites. |
| Sport regulatory class | Prohibited at all times | Listed as a metabolic modulator by WADA. |
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.
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.
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.
Handling and quality assessment of cardarine reference material follow general laboratory practices for poorly characterized compounds. It typically appears as a white to off-white powder and is sparingly soluble in water but soluble in organic solvents such as dimethyl sulfoxide and ethanol. Storage recommendations usually specify a cool, dry, dark place, with long-term storage at low temperature and desiccation. Purity may be checked by high-performance liquid chromatography with ultraviolet detection, while identity is confirmed by mass spectrometry and nuclear magnetic resonance. No pharmacopeial monograph exists, so reported purity and stability depend on the supplier’s methods.
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
Indirect algicidal mechanisms involve no physical contact. Instead, bacteria secrete compounds into the environment that result in the death of algal cells. There is a wide variety of chemical compounds that may have algicidal capabilities, including alkaloids, amino acids, peptides, proteins, carbohydrates, lipids, enzymes, polyketides, terpenoids, and fatty acids. Secretion can be constitutive, in which chemicals are released continuously, or inducible, in which the detection of other molecules or cells trigger their release. There is also evidence that algicidal chemicals act additively. For example, ortho-tyrosine and urocanic acid, both produced by Bacillus sp. B1, had algicidal effects on Heterosigma akashiwo, where ortho-tyrosine affected its photosynthetic system, and urocanic acid damaged its mitochondria.
21 May – Scottish culture secretary Angus Robertson calls for an urgent meeting with Creative Scotland after an arts project involving real sex was given over £100,000 in government funding. Aberdeen sheriff Jack Brown is to be removed from office over sexual harassment allegations after a tribunal finds he has committed "serious improper conduct" towards two women. 23 May – Police Scotland announces that it has submitted a "standard prosecution report" concerning its investigation into SNP finances to the Crown Office and Procurator Fiscal Service. First Minister John Swinney announces he will not accept a parliamentary committee ruling to exclude Michael Matheson from Holyrood for 27 days over his £11,000 iPad charges bill, claiming the decision is "prejudiced" due to the involvement of a Conservative MSP who previously made comments about Matheson. 25 May – The Faculty of Advocates finds Andrew Smith KC guilty of serious misconduct over "serious and reprehensible" actions relating to a legal case involving a dating app business in which he had a "close personal involvement". Celtic defeat Rangers 1–0 to win the 2024 Scottish Cup final. 29 May – MSPs vote 64–0 to exclude former Health Secretary Michael Matheson from the Scottish Parliament for 27 sitting days, and to suspend his salary for 54 days, after he breached expenses rules by accululating an £11,000 bill on his parliamentary iPad. The governing SNP abstains from voting, and calls for a review of the complaints procedure, suggesting it could be open to bias.
=== Generic names === Anastrozole is the generic name of the drug and its INNTooltip International Nonproprietary Name, USANTooltip United States Adopted Name, BANTooltip British Approved Name, and JANTooltip Japanese Accepted Name.
== FSH preparations == Preparations of follicle-stimulating hormone (FSH) mainly include those derived from the urine of menopausal women, as well as recombinant preparations. The recombinant preparations are more pure and more easily administered, but they are more expensive. The urinary preparations are equally effective and less expensive, but are not as convenient to administer as they are available in vials versus injection pens. One study reported that users of the purified urinary FSH preparation Bravelle experienced less injection site pain compared to the recombinant preparation Follistim.
==== Cylindrical spirals myopathy ==== Cylindrical spirals myopathy is very rare with only 18 individual cases described as of 2013. The majority of cases are sporadic, and has been observed in only 3 families. It is characterized by the presence of cylindrical spirals as the main pathological finding in muscle biopsies. Cylindrical spirals are unusual membrane structures that have a spiral pattern. These membrane structures are seen during electron microscopic examination of the affected muscle. These structures merge into or are surrounded by tubular structures that resemble tubular aggregates. Tubular aggregates are abnormal accumulations of membranous tubules and have been observed in a wide variety of muscle diseases and originate from the sarcoplasmic reticulum. Cylindrical spirals were first described in 1979 and were thought to be a non-specific reaction of skeletal muscle secondary to a metabolic disturbance or muscle fibre injury. The molecular basis of cylindrical spiral myopathy is currently unknown, however a genetic mutation affecting the sarcoplasmic reticulum in some patients seems likely, as SERCA1, calsequestrin, and RYR1 have been shown to bind to cylindrical spirals. Cylindrical spirals have also been shown to react with the mitochondrial enzyme succinate dehydrogenase, which suggests that cylindrical spirals originate from mitochondria. Phenotypes are quite variable, and manifestations can include weakness, abnormal gait, myotonia, cramps, and scoliosis.
Sources: en.wikipedia.org
Many of the most important rights were codified in the Charter of Fundamental Rights of the European Union in 2000. While the UK has opted out of direct application of the Charter, this has little practical relevance since the Charter merely reflected pre-existing principles and the Court of Justice uses the Charter to interpret all EU law. For example, in Test-Achats ASBL v Conseil des ministres, the Court of Justice held that Equal Treatment in Goods and Services Directive 2004 article 5(2), which purported to allow a derogation from equal treatment, so that men and women could be charged different car insurance rates, was unlawful. It contravened the principle of equality in CFREU 2000 articles 21 and 23, and had to be regarded as ineffective after a transition period. By contrast, in Deutsches Weintor eG v Land Rheinland-Pfalz wine producers claimed that a direction to stop marketing their brands as 'easily digestible' (bekömmlich) by the state food regulator (acting under EU law) contravened their right to occupational and business freedom under CFREU 2000 articles 15 and 16. The Court of Justice held that in fact, the right to health for consumers in article 35 has also to be taken into account, and was to be given greater weight, particularly given the health effects of alcohol. Some rights in the Charter, however, are not expressed with sufficient clarity to be regarded as directly binding.
An X-ray examination can be used to detect changes in the size, density and position of the kidneys as well as some urinary stones (struvite and calcium oxalate stones are "radiopaque") and soft tissue calcifications. In severely emaciated cats or fluid accumulations in the retroperitoneal space, however, the kidney can only be visualized to a limited extent on the X-ray image due to the resulting reduction in contrast. Excretory urography, in which a radiopaque contrast medium (e.g. Iopamidol, Iohexol) is injected into the bloodstream and its excretion via the kidneys is recorded radiographically. This makes it possible to detect circulatory disorders, dysfunctions of the renal corpuscles and obstructions of the outflow pathways.
The "Second Indo-Iranian style" evolved with a few intermediate stages, expressing continuous influence from India, combined with influence from the Eastern Iran sphere, at that time occupied by the Sasanian Empire and the Hephthalites, with strong Sogdian cultural elements. The Hephthalites lost political power circa 550 CE after being defeated by the Sasanids and the Western Turks, but they remained influential for a long time, having fragmented into semi-independent Principalities. Sogdia, at the center of a new Silk Road between China to the Sasanian Empire and the Byzantine Empire became extremely prosperous around that time.
Another fissile isotope, uranium-233, can be produced from natural thorium and is studied for future industrial use in nuclear technology. Uranium-238 has a small probability for spontaneous fission or even induced fission with fast neutrons; uranium-235, and to a lesser degree uranium-233, have a much higher fission cross-section for slow neutrons. In sufficient concentration, these isotopes maintain a sustained nuclear chain reaction. This generates the heat in nuclear power reactors and produces the fissile material for nuclear weapons. The primary civilian use for uranium harnesses the heat energy to produce electricity. Depleted uranium (238U) is used in kinetic energy penetrators and armor plating. The 1789 discovery of uranium in the mineral pitchblende is credited to Martin Heinrich Klaproth, who named the new element after the recently discovered planet Uranus. Eugène-Melchior Péligot was the first person to isolate the metal, and its radioactive properties were discovered in 1896 by Henri Becquerel. Research by Otto Hahn, Lise Meitner, Enrico Fermi and others (including J. Robert Oppenheimer), beginning in 1934, led to its use as a fuel in the nuclear power industry and in Little Boy, the first nuclear weapon used in war. An ensuing arms race during the Cold War between the United States and the Soviet Union produced tens of thousands of nuclear weapons that used uranium metal and uranium-derived plutonium-239. Dismantling of these weapons and related nuclear facilities is carried out within various nuclear disarmament programs and costs billions of dollars.
Sources: en.wikipedia.org
It binds to and activates PPAR delta, a nuclear receptor that controls expression of genes related to fatty acid oxidation. This mechanism can alter energy metabolism in animal models. It is not a direct stimulant or fat-burning enzyme.
Early-stage trials examined lipid and glucose markers, but the development program was discontinued. Published human results are limited and do not support approved use for any indication. Claims of performance or health benefits remain unproven.
Yes. Laboratories use LC-MS/MS to detect GW501516 and its metabolites in urine. Detection depends on timing and sensitivity, but the substance is banned at all times.
Yes, WADA prohibits cardarine as a PPARδ agonist. It appears on the prohibited list and can be detected in urine or blood. Athletes using it risk sanctions.