The short version of GW501516 fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-05-25 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.
Cardarine is a common name for GW501516, also GW-1516, a synthetic compound developed as a peroxisome proliferator-activated receptor delta (PPARδ) agonist. It belongs to a class of agents that modulate gene transcription related to lipid and energy metabolism. The compound was studied in preclinical and early clinical research for metabolic and cardiovascular conditions, but it did not progress to approved therapeutic use. Its name appears in fitness and sports contexts despite not being approved as a drug.
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.
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 |
|---|---|---|
| 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. |
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.
Detection of GW501516 in biological samples generally relies on liquid chromatography coupled with tandem mass spectrometry. Urine is a common matrix in anti-doping analysis, while blood or plasma may be used in research settings. Sample preparation can involve enzymatic hydrolysis, protein precipitation, or solid-phase extraction before instrumental analysis. Because the compound undergoes metabolism, assays may target the parent molecule, one or more metabolites, or both. Detection windows are not fixed; they depend on factors such as dose, route, individual metabolism, and assay sensitivity. Reference standards are required for accurate identification and quantification.
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.
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.
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 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.
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.
The common krait (Bungarus caeruleus) is often considered to be the most dangerous snake species in India. Its venom consists mostly of powerful neurotoxins which induce muscle paralysis. Clinically, its venom contains presynaptic and postsynaptic neurotoxins. Due to the fact that krait venom contains many presynaptic neurotoxins, patients bitten will often not respond to antivenom because once paralysis has developed it is not reversible. This species causes an estimated 10,000 fatalities per year in India alone. There is a 70–80% mortality rate in cases where there is no possible or poor and ineffective treatment (e.g., no use of mechanical ventilation, low quantities of antivenom, poor management of possible infection). Average venom yield per bite is 10 mg (Brown, 1973), 8 to 20 mg (dry weight) (U.S. Dept. Navy, 1968), and 8 to 12 mg (dry weight) (Minton, 1974). The lethal adult human dose is 2.5 mg. In mice, the LD50 values of its venom are 0.365 mg/kg SC, 0.169 mg/kg IV and 0.089 mg/kg IP.
All branches connect at Jamaica station except the Port Washington Branch. Jamaica station also connects to Airtrain JFK for service to John F. Kennedy International Airport. Normally, the LIRR uses tracks 17 to 21 exclusively and shares tracks 13 to 16 with Amtrak and NJT. The LIRR uses tracks 11 and 12 on rare occasions.
Dehydration at 315 °C: 2 NaHSO4 → Na2S2O7 + H2O Cracking at 460 °C: Na2S2O7 → Na2SO4 + SO3 The latter occurs at lower temperatures (around 300 °C) in the presence of catalytic H2SO4. KHSO4 undergoes the same reactions at a higher temperature. Another two step method involving a salt pyrolysis starts with concentrated sulfuric acid and anhydrous tin tetrachloride:
Sources: en.wikipedia.org
== Ease of doing business == World Bank's Doing Business 2017; Equal Opportunity for All: Thailand ranked 46th (1-easiest; 190=difficult) of 190 nations in the "Ease of Doing Business" rankings. Other ASEAN states ranked: Singapore, 2; Malaysia, 23; Brunei, 72; Vietnam, 82; Indonesia, 91; Philippines, 99; Cambodia, 131; Laos, 139; Myanmar, 170. World Bank's Doing Business 2016: Measuring Regulatory Quality and Efficiency: Thailand ranked 49th overall of 189 nations (1=best, 189=worst) in ease of doing business, a drop of three places in the rankings since the 2014 survey prior to the May coup. Among ASEAN nations, Thailand ranked third behind Singapore and Malaysia. In detailed rankings, Thailand ranked 97th worldwide in getting credit, 96th in ease of starting a business, 70th in paying taxes, 39th in dealing with construction permits, 57th in registering property and enforcing contracts, 56th in trading across borders, 36th for protecting minority investors, and 49th in resolving insolvency.
There are a variety of career paths within the field of medical genetics, and naturally the training required for each area differs considerably. The information included in this section applies to the typical pathways in the United States and there may be differences in other countries. US practitioners in clinical, counseling, or diagnostic subspecialties generally obtain board certification through the American Board of Medical Genetics.
== External links == "Carol Robinson's Interview with Denis Noble". YouTube. voicesfromoxfordUK. 18 December 2013. (See Denis Noble.) "A New Phase for Structural Biology – with Carol Robinson". YouTube. The Royal Institution. 6 July 2016. "Mass spectrometry: From ribosomes to receptors | Prof Dame Carol Robinson DBE FRS FMedSci". YouTube. Cambridge SciSoc. 26 March 2021. "Carol Vivien, DBE, FRS, FMedSci ~ 10/14/2020 – Physiology Bashour Speaker". YouTube. UTSW Department of Physiology. 29 March 2021. "JACS in Conversation with Professor Dame V. Robinson". YouTube. ACS Productions. 7 September 2021. (interview conducted by Erick M. Carreira)
Sources: en.wikipedia.org
All these reports were written in context of Jesuit missions in South America, specially the Mainas missions, in Latin and sent only to Rome, so their audience was not very large and they were promptly lost in the archives. For this reason, ayahuasca did not receive attention for the entire subsequent century.
=== Positive selection === T cells have distinct receptors. These receptors are formed by the process of V(D)J recombination gene rearrangement stimulated by RAG1 and RAG2 genes. This process is error-prone, and some thymocytes do not make functional T-cell receptors, whereas other thymocytes make autoreactive T-cell receptors. If a functional T cell receptor is formed, the thymocyte expresses the cell surface proteins CD4 and CD8 simultaneously. The survival and nature of the T cell then depend on its interaction with surrounding thymic epithelial cells. The T cell receptor interacts with the MHC molecules on the surface of epithelial cells. A T cell with a receptor that doesn't react, or reacts weakly, dies by apoptosis. T cells that react survive and proliferate. A mature T cell expresses either CD4 or CD8, but not both. This depends on the binding strength between the TCR and MHC class 1 or class 2. A T cell receptor that binds mostly to MHC class I tends to produce a mature "cytotoxic" CD8 positive T cells those that bind mostly to MHC class II typically produce a CD4 positive T cell.
=== Sports === Professional athletes have been documented using sildenafil, believing the opening of their blood vessels will enrich their muscles. In turn, they believe it will enhance their performances.
Bottom photography as part of this project obtained images from the end of a film roll of a deep-sea camera sled (processed on board the vessel November 14, 1984) that resulted in clear images of vesicomyid clam chemosynthetic communities (Rossman et al., 1987) coincidentally in the same manner as the first documentation of chemosynthetic communities at the Galapagos Rift investigating hot water plumes by camera sled in the Pacific in 1976 (Lonsdale 1977). Photography during the same LGL/MMS cruise also documented tube-worm communities in situ in the Central Gulf of Mexico for the first time (not processed until after the cruise; Boland, 1986) prior to the initial submersible investigations and firsthand descriptions of Bush Hill (27°47′02″N 91°30′31″W) in 1986. The Bush Hill site was targeted by acoustic "wipeout" zones or lack of substrate structure caused by seeping hydrocarbons. This was determined using an acoustic pinger system during the same cruise on the R/V Edwin Link (renamed from Sea Diver and only 113 ft (34 m)), which used one of the Johnson Sea Link submersibles. This site represents the first eyes-on human observations of chemosynthetic communities in the northern Gulf of Mexico and is characterized by dense tubeworm and mussel accumulations, as well as exposed carbonate outcrops with numerous gorgonian and Lophelia coral colonies. Bush Hill has become one of the most thoroughly-studied chemosynthetic sites in the world.
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.
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.