If you have been reading about Reference standard and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-03-24. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Regulatory treatment of cardarine differs by context and jurisdiction. In competitive sport, the World Anti-Doping Agency lists PPARδ agonists, including GW501516, as prohibited at all times. Outside sport, it lacks approval as a prescription medicine in major drug markets, and products sold for human consumption may be treated as unapproved drugs. Some countries also restrict importation or sale through general consumer protection and medicines laws. These classifications affect availability, testing, and legal risk without establishing therapeutic value.
Because cardarine is not an approved medicine, no pharmacopeial monograph defines its identity, purity, or storage requirements. Laboratories typically rely on in-house methods and reference standards when testing materials labeled as GW501516. Certificates of analysis may report purity and identity for a specific batch, but their scope varies and they do not guarantee safety or legal status. Independent verification can include high-performance liquid chromatography, mass spectrometry, nuclear magnetic resonance, and elemental analysis. The distinction between research chemical labeling and human use is significant because quality standards and oversight differ.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a PPARδ agonist. |
| Typical detection matrix | Urine | Most common sample for anti-doping analysis. |
| Common analytical method | LC-MS/MS | Liquid chromatography-tandem mass spectrometry. |
| Common synonyms | GW501516, GSK-516, endurobol | Names found in research and fitness contexts. |
| Typical detection window | Variable | Depends on dose, route, and individual metabolism. |
medical genetics The branch of medicine and medical science that involves the study, diagnosis, and management of hereditary disorders, and more broadly the application of knowledge about human genetics to medical care.
=== Prehistory === Human remains found in Peștera cu Oase ("Cave with Bones"), radiocarbon date from circa 40,000 years ago, and represent the oldest known Homo sapiens in Europe. Neolithic agriculture spread after the arrival of a mixed group of people from Thessaly in the 6th millennium BC. Excavations at the Poiana Slatinei site near a salt spring next to Lunca, Neamț yielded the earliest evidence for salt exploitation in Europe; here salt production began between the 5th and 4th millennium BC. The first permanent settlements developed into "proto-cities", which were larger than 320 hectares (800 acres). The Cucuteni–Trypillia culture—the best known archaeological culture of Old Europe—flourished in Muntenia, southeastern Transylvania and northeastern Moldavia in the 3rd millennium BC. The first fortified settlements appeared around 1800 BC, showing the militant character of Bronze Age societies.
In Algeria, public universities are a key part of the education system, and education is considered a right for all citizens. Access to these universities requires passing the Baccalaureate (Bac) exam, with each institution setting its own grade requirements (out of 20) for different majors and programs. Notable public universities include the University of Algiers, University of Oran, and University of Mentouri Constantine.
== Honours == Bengt Mannervik (born Eriksson) studied at the prestigious high school Norra Real in Stockholm and was given the prize for the best graduate in 1962. In 1988 he won the competition among 20 applicants for the internationally advertised Karin and Herbert Jacobsson Professorship of Biochemistry at Uppsala University, originally held by Nobel Prize Laureate Arne Tiselius. In 2013 he was awarded the Björkén Prize of Uppsala University. He was elected to the Academia Europaea in 2023. He was elected to the American Association for Cancer Research, and the Royal Society of Sciences at Uppsala. He is an Honorary Member of the American Society of Biochemistry and Molecular Biology. He was nominated Doctor Jubilaris at Stockholm University in 2022.
Sources: en.wikipedia.org
A helium mass spectrometer or helium leak detector are unique instruments commonly used to detect and locate small leaks. The helium leak detector was initially developed in the Manhattan Project during World War II to find extremely small leaks in the gas diffusion process of uranium enrichment plants. Typically, the test method uses a vacuum chamber, at vacuum pressures typically less than 100mTorr, in which a helium pressurized system under test is placed. Helium leaks out of the system under test, with the rate of leakage detected by an optimal ion source mass spectrometer or leak detector.
== Efficacy == On 16 June 2021, CureVac said its vaccine showed 47% efficacy from its Phase IIb/III trial. Later, the final result data showed an efficacy of 48% against symptomatic disease in all age groups and, for people aged 18 to 60 years, an efficacy of 53% against symptomatic disease, 77% against moderate and severe disease and 100% against hospitalization and death, as no cases were detected in the study. This was based on interim analysis of 134 COVID cases in its Phase III study conducted in Europe and Latin America. The final analysis for the trials requires a minimum of 80 additional cases.
The pervasive and ecologically devastating human encroachment of recent decades has critically endangered Indian wildlife. In response, the system of national parks and protected areas, first established in 1935, was expanded substantially. In 1972, India enacted the Wildlife Protection Act and Project Tiger to safeguard crucial wilderness; the Forest Conservation Act was enacted in 1980 and amendments added in 1988. India hosts more than five hundred wildlife sanctuaries and eighteen biosphere reserves, four of which are part of the World Network of Biosphere Reserves; its eighty-nine wetlands are registered under the Ramsar Convention.
Sources: en.wikipedia.org
This consists of a refrigeration cycle, where heat is removed from a low-temperature space or source and rejected to a high-temperature sink with the help of external work, inverse of the thermodynamic power cycle. In the power cycle, heat is supplied from a high-temperature source to the engine, part of the heat being used to produce work and the rest being rejected to a low-temperature sink. This satisfies the second law of thermodynamics. A refrigeration cycle describes the changes that take place in the refrigerant as it alternately absorbs and rejects heat as it circulates through a refrigerator. It is also applied to heating, ventilation, and air conditioning HVACR work, when describing the "process" of refrigerant flow through an HVACR unit, whether it is a packaged or split system. Heat naturally flows from hot to cold. Work is applied to cool a living space or storage volume by pumping heat from a lower temperature heat source into a higher temperature heat sink. Insulation is used to reduce the work and energy needed to achieve and maintain a lower temperature in the cooled space. The operating principle of the refrigeration cycle was described mathematically by Sadi Carnot in 1824 as a heat engine. The most common types of refrigeration systems use the reverse-Rankine vapor-compression refrigeration cycle, although absorption heat pumps are used in a minority of applications. Cyclic refrigeration can be classified as:
==== T ==== Tarhana – is a Central Asian dried soup. Instant tea is a powdered mix in which water is added, in order to reconstitute it into a cup of tea. Tempeh – is soybeans pressed into a cake that undergoes fermentation. When dried it has a shelf life of several months. Terasi (trassi in Dutch) – Indonesian (especially Javanese cuisine) variant of dried shrimp paste usually pressed into dry blocks. It is also sometimes sold ground as a granulated powder.
==== Biological ==== Most birds, reptiles, insects (such as bees), and a few mammals such as mice, reindeer, dogs, and cats can see near-ultraviolet wavelengths. Many fruits, flowers, and seeds stand out more strongly from the background in ultraviolet wavelengths as compared to human color vision. Scorpions glow or take on a yellow to green color under UV illumination, thus assisting in the control of these arachnids. Mantis Shrimp such as Neogonodactylus oerstedii can sense ultraviolet wavelengths assisting them in hunting and survival. Many birds have patterns in their plumage that are invisible at usual wavelengths but observable in ultraviolet, and the urine and other secretions of some animals, including dogs, cats, and human beings, are much easier to spot with ultraviolet. Urine trails of rodents can be detected by pest control technicians for proper treatment of infested dwellings. Butterflies use ultraviolet as a communication system for sex recognition and mating behavior. For example, in the Colias eurytheme butterfly, males rely on visual cues to locate and identify females. Instead of using chemical stimuli to find mates, males are attracted to the ultraviolet-reflecting color of female hind wings. In Pieris napi butterflies it was shown that females in northern Finland with less UV-radiation present in the environment possessed stronger UV signals to attract their males than those occurring further south.
Sources: en.wikipedia.org
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.
Detection usually uses liquid chromatography-tandem mass spectrometry after sample cleanup. Laboratories look for the parent compound or metabolites. The method requires validated reference standards and controls.
Legality varies by country. In many places it is an unapproved drug and cannot be legally sold for human consumption. Purchasing from online vendors carries legal and quality risks.
Anti-doping laboratories typically use LC-MS/MS to detect GW501516 and its metabolites in urine. The method is sensitive and can identify the compound at low concentrations. Detection depends on sample timing, metabolism, and the specific assay.