unapproved substance comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2025-08-19. Where a claim depends on a specific study, the study is described rather than over-claimed.
Cardarine is a common name for GW501516, a synthetic compound first described in the 1990s as a selective agonist of the peroxisome proliferator-activated receptor delta. It was studied in preclinical models for metabolic and cardiovascular conditions, but it has not been approved as a medicine in the United States, Europe, or other major jurisdictions. Retail products labeled as cardarine are generally research chemicals or supplements, not pharmaceutical formulations. Because human safety and efficacy data remain limited, regulatory agencies treat it as an unapproved substance rather than a therapeutic product.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| IUPAC name | {4-[({4-methyl-2-[4-(trifluoromethyl)phenyl]-1,3-thiazol-5-yl}methyl)sulfanyl]phenoxy}acetic acid | Systematic name for GW501516 |
| CAS Registry Number | 317318-70-0 | Unique identifier for the parent compound |
| Molecular formula | C21H18F3NO3S2 | Includes carbon, hydrogen, fluorine, nitrogen, oxygen, and sulfur |
| Molecular weight | 453.5 g/mol | Approximate value for the neutral form |
| Appearance | White to off-white powder | Typical description for purified laboratory material |
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.
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.
GW501516 binds and activates PPARδ, a nuclear receptor that influences transcription of genes involved in fatty acid oxidation and energy use. Activation shifts some metabolic pathways in preclinical models, which is why the compound has been studied for lipid disorders and exercise-related endpoints. The exact downstream effects in humans are incompletely mapped. PPARδ is expressed in many tissues, including skeletal muscle, liver, and adipose tissue, so broad activation may have varied consequences. Researchers continue to examine how selective or partial activation might alter the balance between benefits and risks.
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
=== Patent === Toward the end of January 1922, tensions mounted between the four "co-discoverers" of insulin and Collip briefly threatened to separately patent his purification process. John G. FitzGerald, director of the non-commercial public health institution Connaught Laboratories, therefore stepped in as peacemaker. The resulting agreement of 25 January 1922 established two key conditions: 1) that the collaborators would sign a contract agreeing not to take out a patent with a commercial pharmaceutical firm during an initial working period with Connaught; and 2) that no changes in research policy would be allowed unless first discussed among FitzGerald and the four collaborators. It helped contain disagreement and tied the research to Connaught's public mandate.
Repeated heroin use changes the physical structure and physiology of the brain, creating long-term imbalances in neuronal and hormonal systems that are not easily reversed. Studies have shown some deterioration of the brain's white matter due to heroin use, which may affect decision-making abilities, the ability to regulate behavior, and responses to stressful situations. Heroin also produces profound degrees of tolerance and physical dependence. Tolerance occurs when more and more of the drug is required to achieve the same effects. With physical dependence, the body adapts to the presence of the drug, and withdrawal symptoms occur if use is reduced abruptly.
For example, the pineapple flavour or butyl acetate esters was produced by the esterification reactions between acetic acid and butanol by R. oryzae. This flavor compound can be used in food, cosmetic and pharmaceutical industries. Within the biodiesel industry, biodiesel fuel as fatty acid methyl ester is produced by the esterification of plant oil or animal fat with methanol. This is a renewable fuel resource compared to the traditional petroleum-based fuels. Production of biodiesel fuel from plant oils from cells of R. oryzae immobilized within biomass support particles were investigated for the methanolysis of soybean oil. Olive oil or oleic acid was found to be effective for enhancing methanolysis activity which is a promising results within the biodiesel industry. R. oryzae has been investigated as a bioremediation agent fluoride sequestrant.
Sources: en.wikipedia.org
==== M ==== Evaporated milk – is a shelf-stable canned milk product with about 60% of the water removed. It differs from sweetened condensed milk, which contains added sugar. Powdered milk – is a manufactured dairy product made by evaporating milk to dryness. In modern times, powdered milk is usually made by spray drying nonfat skimmed milk, whole milk, buttermilk, or whey. Pasteurized milk is first concentrated in an evaporator to around 50% milk solids. The resulting concentrated milk is then sprayed into a heated chamber where the water almost instantly evaporates, leaving fine particles of powdered milk solids.
== June 21, 1915 (Monday) == Gorlice–Tarnów Offensive — Grand Duke Nicholas Nicholaevitch ordered Russian forces to abandon Galicia. Gallipoli campaign — French artillery bombarded Ottoman 2nd Division holding Kereves Spur (Kervizdere), causing 6,000 casualties. French attacked and captured part of the crest but didn't break through to capture the second part until nine days later, at a cost of 2,500 casualties. Battle of Bukoba — British colonial forces from Kisumu in British East Africa raided Bukoba, German East Africa in an attempt to destroy its wireless station. Georgia Governor John M. Slaton released a 29-page report on the hearing of Leo Frank where he concluded there was sufficient new evidence not available at the original trial that cast doubt on Frank's guilt on the murder of Mary Phagan and ordered the death sentence to be commuted to life imprisonment. The U.S. Supreme Court ruled that separate state laws in Oklahoma and Maryland that exempted voters from literacy tests or poll taxes were unconstitutional since they were designed to be discriminating against black voters, and therefore in violation of the Fifteenth Amendment to the United States Constitution. Born: Ernest Llewellyn, Australian violinist and music educator, founding director of the ANU School of Music; in Kurri Kurri, New South Wales, Australia (d. 1982) Died: Addai Scher, 48, Turkish clergy, archbishop for the Chaldean Catholic Church in Siirt; killed in the Assyrian genocide (b. 1867)
terminator A DNA sequence or its RNA complement which signals the termination of transcription by triggering processes that ultimately arrest the activity of RNA polymerase and/or cause the release of the nascent RNA transcript from the transcriptional complex. Terminator sequences are usually found near the 3'-ends of the coding sequences of genes or operons. They generally function after being themselves transcribed into the nascent strand, whereupon the part of the strand containing the sequence either directly interacts with the transcriptional complex or a cofactor or forms a secondary structure such as a hairpin loop which signals the recruitment of enzymes that promote its disassembly.
Sources: en.wikipedia.org
== Target == Anti-nRNP antibodies target small nuclear ribonucleoproteins (snRNPs). They specifically target the U1-snRNP complex, which is a part of the spliceosome. The spliceosome is an essential cellular component responsible for the removal of introns from pre-messenger RNA, an important step in processing genetic information before it is translated into proteins. The spliceosome is made up of 5 different complexes, U1, U2, U4, U5, and U6. All of these complexes contain the same 7 Sm proteins. U1-snRNP is made up of the 7 core Sm proteins, U1-RNA, and 3 unique proteins. The proteins most commonly targeted within the complex are RNP68/70, RNPA, and RNPC. The U1-snRNP complex recognizes the beginning of an intron during RNA splicing, making it the first step in the process. Because of its important role, proteins within the U1 complex are highly conserved and are found in almost every cell in the human body. Patients may produce antibodies against several proteins within the U1-snRNp complex, so the antibody pattern can be different depending on each individual. The U1 snRNP complex contains several proteins, including U1-70K, U1-A, and U1-C, along with small nuclear RNA and Sm proteins. Autoantibodies most commonly recognize the U1-70K protein, although antibodies against other proteins in the complex may also occur. Researchers have found that patients may produce antibodies against one or several of these proteins, and the specific antibody pattern can vary between individuals.
Ecdysozoa () is a group of protostome animals, including Arthropoda (insects, chelicerates (including arachnids), crustaceans, and myriapods), Nematoda, and several smaller phyla. The grouping of these animal phyla into a single clade was first proposed by Eernisse et al. (1992) based on a phylogenetic analysis of 141 morphological characters of ultrastructural and embryological phenotypes. This clade, that is, a group consisting of a common ancestor and all its descendants, was formally named by Aguinaldo et al. in 1997, based mainly on phylogenetic trees constructed using 18S ribosomal RNA genes. A large study in 2008 by Dunn et al. strongly supported the monophyly of Ecdysozoa. The group Ecdysozoa is supported by many morphological characters, including growth by ecdysis, with moulting of the cuticle – without mitosis in the epidermis – under control of the prohormone ecdysone, and internal fertilization. The group was initially contested by a significant minority of biologists. Some argued for groupings based on more traditional taxonomic techniques, while others contested the interpretation of the molecular data.
In India's eyes, the United States would once again be regarded as untrustworthy." The Trump administration avoided sanctioning India for the Russian S-400 missile system, but sanctioned Turkey and China for the same purchases. President Trump has grown closer to India's BJP government, which shares the similar right-wing views, he has repeatedly praised Modi's leadership and avoided any negative criticism of the Indian government's actions on the citizenship and Kashmir disputes. The Trump administration is consistent with the Modi administration in combating "radical Islamic terrorism", and the US reiterates its support for India's elimination of terrorist training camp in Pakistan. In early 2020, India provided its agreement for terminating an export embargo on a medicinal drug known as hydroxychloroquine amidst the combat against the ongoing coronavirus (COVID-19) pandemic, after Trump threatened retaliation against India, if it did not comply with terminating the export embargo on hydroxychloroquine. In June 2020, during the George Floyd protests, the Mahatma Gandhi Memorial in Washington, D.C., was vandalised by unknown miscreants on the intervening night of June 2 and 3. The incident prompted the Indian Embassy to register a complaint with law enforcement agencies. Taranjit Singh Sandhu, the Indian Ambassador to the United States called the vandalism "a crime against humanity". U.S. President Donald Trump called the defacement of Mahatma Gandhi's statue a "disgrace".
Sources: en.wikipedia.org
No. Major drug regulators have not approved GW501516 for treating any medical condition. Products sold as cardarine are typically unapproved research chemicals or supplements, so their contents and safety are not assured.
It is prohibited by the World Anti-Doping Agency as a hormone and metabolic modulator. Athletes who test positive for GW501516 can face sanctions, including suspensions and loss of results.
Cardarine is a common or trade-style name, while GW501516 is the research code for the same chemical entity. Some sources also use Endurobol or GSK-516. The names refer to the same compound, not distinct drugs.
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.