LC-MS/MS raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-03-22 and is reviewed periodically as new material appears.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
Activation of PPARδ changes transcription of genes involved in fatty acid transport, mitochondrial function, and skeletal muscle fuel preference. In rodent studies, pharmacological PPARδ activation was associated with increased endurance and altered body composition. These findings generated interest in performance enhancement, but species differences and study designs limit direct extrapolation to humans. Small human trials were conducted in the 2000s and later discontinued. The extent to which cardarine produces similar metabolic or performance effects in people remains an open question.
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic PPARδ agonist | Not a steroid or a selective androgen receptor modulator. |
| Common synonyms | Cardarine, GW501516, GW-501516, endurobol | Names vary by supplier and literature source. |
| Appearance | White to off-white powder | Consistent with many small-molecule research chemicals. |
| Solubility | Low in water; soluble in DMSO and ethanol | Often prepared in organic solvent for laboratory work. |
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid and energy metabolism. |
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.
Cardarine can be detected in biological samples and product materials using liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). The method separates compounds by chromatography and identifies them by mass-to-charge transitions, allowing low-level detection in urine or blood. Sample preparation often involves enzymatic hydrolysis, solid-phase extraction, or protein precipitation. Certified reference materials and isotope-labeled internal standards improve quantification. Detection windows depend on metabolism, matrix, and assay sensitivity, so no single universal window applies.
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.
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.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
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.
In the fitness and bodybuilding literature, cardarine is frequently discussed as an endurance agent or fat-loss compound, although such claims are not supported by robust clinical evidence. Online descriptions often mix animal data, user anecdotes, and marketing language. Researchers who study PPARδ agonists distinguish between receptor activation in controlled experiments and unsupervised use of unverified products. The latter introduces unknown purity, dose, and interactions, making reported experiences difficult to interpret scientifically.
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
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.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
intervention is complex and requires careful consideration. International law remains the guiding framework. At this stage, political instability in Venezuela must be avoided. The objective is an orderly transition to an elected government." Holy See: Pope Leo XIV expressed concern over the US attack on Venezuela and the arrest of Maduro. He stated "The good of the beloved Venezuelan people must prevail over every other consideration and lead us to overcome violence and to undertake paths of justice and peace ..." at the midday Angelus prayer. Pope Leo invited everyone to pray for the people of Venezuela in St. Peter's Square. Hungary: Prime Minister Viktor Orbán welcomed the capture of Maduro as "good news" for Hungary, stating that it will bring down oil prices, and brushed aside legality concerns. He also stated that no Hungarian citizen was harmed in Venezuela, and that the Hungarian government was working to protect Hungarians in the region. He stated the government was working with the energy sector to prevent price increases stemming from the crisis. Iceland: Foreign Minister Þorgerður Katrín Gunnarsdóttir condemned the strikes, stating that "we can and must stand against authoritarianism and human rights abuses at the same time". Ireland: Minister for Foreign Affairs and Trade Helen McEntee said in a statement that she was in close contact with EU High Representative Kaja Kallas, and Ireland underlines the absolute necessity of full respect for international law and the principles of the UN Charter. Italy: Prime Minister Giorgia Meloni defended the U.S.
Blood clotting is measured using standard tests, e.g. prothrombin time, partial thromboplastin time, thrombin time, and/or reptilase time. Low fibrinogen levels and dysfunctional fibrinogens usually prolong these times, whereas the lack of fibrinogen (i.e. afibrinogenemia) renders these times infinitely prolonged. Fibrinogen levels are measured in the plasma isolated from venous blood by immunoassays, or through clotting assays such as the Clauss fibrinogen assay or prothrombin based methods. Normal levels being about 1.5-3 g/L, depending on the method used. These levels are normal in dysfibrinogenemia (i.e. 1.5-3 g/L), decreased in hypofibrinogenemia and hypodysfibrinogenemia (i.e. <1.5 g/L), and absent (i.e. <0.02 g/L) in afibrinogenemia. Functional levels of fibrinogen are measured on plasma induced to clot. The levels of clotted fibrinogen in this test should be decreased in hypofibrinogenemia, hypodysfibrinogenemia, and dysfibrinogenemia and undetectable in afibrinogenemia. Functional fibrinogen/antigenic fibrinogen levels are <0.7 g/L in hypofibrinogenemia, hypodysfibrinogenemia, and dysfibrogenemia, and not applicable in afibrinogenemia. Fibrinogen analysis can also be tested on whole-blood samples by thromboelastometry. This analysis investigates the interaction of coagulation factors, their inhibitors, anticoagulant drugs, and blood cells (specifically, platelets), during clotting and subsequent fibrinolysis as it occurs in whole blood.
The Essential Programme on Immunization (EPI) is a global health initiative led by the World Health Organization agency. It aims to make vaccines available to all globally. It was launched in May 1974 under the old name of Expanded Programme on Immunization. Vaccination has been one of the most impactful public health interventions of the past century. Vaccines have provided the single greatest contribution to improving health outcomes globally, particularly among children and infants. Over its first 50 years, the EPI has prevented 154 million deaths, among which 146 million are in children younger than 5 years of whom 101 million are in infants younger than 1 year. Measles vaccination is the single greatest contributor of lives saved by vaccination, preventing 93.7 million deaths out of total 154 million deaths prevented by vaccination globally. The vaccination has contributed for 40% of the decline in global infant mortality, 52% in the African region. In 2024, a child younger than 10 years is 40% more likely to survive to their next birthday relative to a hypothetical scenario of no vaccination. Increased survival probability is observed into adulthood as well, individuals aged 25 years are 35% more likely, and those aged 50 years are 16% more likely to survive to their next birthday. When the EPI was founded, it focused on childhood vaccination to protect the youngest and most vulnerable.
=== Cornell University === In May 2005, a disco ball was found affixed to the top of McGraw Tower. Due to safety concerns about the glass shattering, the disco ball was removed the next day by crane, costing the university $20,000-$25,000.
The energy released by reactions of oxygen and reduced compounds such as cytochrome c and (indirectly) NADH and FADH2 is used by the electron transport chain to pump protons into the intermembrane space, generating the electrochemical gradient over the inner mitochondrial membrane. In photosynthetic eukaryotes, the electron transport chain is found on the thylakoid membrane. Here, light energy drives electron transport through a proton pump and the resulting proton gradient causes subsequent synthesis of ATP. In bacteria, the electron transport chain can vary between species but it always constitutes a set of redox reactions that are coupled to the synthesis of ATP through the generation of an electrochemical gradient and oxidative phosphorylation through ATP synthase.
Sources: en.wikipedia.org
Pollard MR, Anderson L, Fan C, Hawkins DJ, Davies HM (1991). "A specific acyl-ACP thioesterase implicated in medium-chain fatty acid production in immature cotyledons of Umbellularia californica". Arch. Biochem. Biophys. 284 (2): 306–12. doi:10.1016/0003-9861(91)90300-8. PMID 1989513. Davies HM, Anderson L, Fan C, Hawkins DJ (1991). "Developmental induction, purification, and further characterization of 12:0-ACP thioesterase from immature cotyledons of Umbellularia californica". Arch. Biochem. Biophys. 290 (1): 37–45. doi:10.1016/0003-9861(91)90588-A. PMID 1898097.
These are mostly single-die LEDs used as indicators, and they come in various sizes from 1.8 mm to 10 mm, through-hole and surface mount packages. Typical current ratings range from around 1 mA to above 20 mA. LED's can be soldered to a flexible PCB strip to form LED tape popularly used for decoration. Common package shapes include round, with a domed or flat top, rectangular with a flat top (as used in bar-graph displays), and triangular or square with a flat top. The encapsulation may also be clear or tinted to improve contrast and viewing angle. Infrared devices may have a black tint to block visible light while passing infrared radiation, such as the Osram SFH 4546. 5 V and 12 V LEDs are ordinary miniature LEDs that have a series resistor for direct connection to a 5 V or 12 V supply.
== N == N terminus - N-acetylhexosamine 1-dehydrogenase - N-acylmannosamine 1-dehydrogenase - N-formylmethionylaminoacyl-tRNA deformylase - N-isopropylammelide isopropylaminohydrolase - Na+-transporting two-sector ATPase - NADH:ubiquinone reductase (Na+-transporting) - native gel - nematode Her-1 - neolactotetraosylceramide alpha-2,3-sialyltransferase - nested PCR - neurofibromatosis - NH41 - nick (DNA) - nick translation - NIDDM1 - Niemann-Pick disease, type C - nitrate-transporting ATPase - NMNH (Dihydronicotinamide Mononucleotide) - non-coding DNA - non-coding strand - non-directiveness - nonconservative substitution - nonpolar-amino-acid-transporting ATPase - nonsense codon - nonsense mutation - nontranslated RNA - Northern blot - NT - nuclear run-on - nuclease - nuclease protection assay - nucleoplasmin ATPase - nucleoside - nucleoside-triphosphate diphosphatase - nucleotide - Nucleotide universal IDentifier - nucleus -
The sequence in which the subshells are filled is given in most cases by the Aufbau principle, also known as the Madelung or Klechkovsky rule (after Erwin Madelung and Vsevolod Klechkovsky respectively). This rule was first observed empirically by Madelung, and Klechkovsky and later authors gave it theoretical justification. The shells overlap in energies, and the Madelung rule specifies the sequence of filling according to:
Plastination is a technique used in anatomy to conserve bodies or body parts. The water and fat are replaced by certain plastics, yielding specimens that can be touched, do not smell or decay, and even retain most microscopic properties of the original sample. The technique was invented by Gunther von Hagens when working at the anatomical institute of the Heidelberg University in 1978. Von Hagens patented the technique in several countries and was heavily involved in its promotion, especially as the creator and director of the Body Worlds traveling exhibitions, exhibiting plastinated human bodies internationally. He also founded and directed the Institute for Plastination in Heidelberg. More than 40 institutions worldwide have facilities for plastination, mainly for medical research and study, and most affiliated to the International Society for Plastination.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist. It is not a steroid or a selective androgen receptor modulator. It was developed and studied as a research compound for metabolic pathways.
It binds to and activates PPARδ, a nuclear receptor that regulates genes related to fatty acid oxidation and energy use. This activation alters transcription in tissues such as skeletal muscle and liver. The full range of downstream effects in humans is not fully established.
No, cardarine is not known to occur naturally in plants, animals, or humans. It is a synthetic molecule produced for laboratory research. Products labeled as cardarine should therefore be treated as manufactured chemicals with variable purity.
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.