A practical reference on Research chemical: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-02-18 and is reviewed periodically as new material appears.
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.
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 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 | 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. |
Laboratory studies have examined GW501516 in cell cultures and rodents for conditions such as dyslipidemia, insulin resistance, and obesity. Some trials in humans were initiated, but development was discontinued after preclinical findings raised concerns about cancer in certain models. Those findings do not prove that the compound causes cancer in people, but they contributed to regulatory caution. Later reviews often describe the evidence as preliminary and insufficient for assessing long-term safety.
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.
Human trials of GW501516 were small and short in duration. They examined lipid levels, glucose handling, and other metabolic markers, but the programs were halted after the animal cancer findings. No approved therapeutic product exists, and published human data are insufficient for establishing long-term safety. Reports of use for athletic performance come mainly from non-clinical settings and cannot be verified through controlled trials. Independent testing of products sold as cardarine has found inconsistent purity and labeling.
Laboratory studies indicate that GW501516 activates PPARδ, a nuclear receptor involved in fatty acid oxidation and energy metabolism. In rodent experiments, treated animals often showed increased endurance and reduced fat mass. These effects were observed under controlled conditions and do not establish safe or effective use in humans. The exact dose-response relationship in humans remains poorly characterized. Species differences in metabolism can affect how results translate across animals and people.
Safety concerns emerged from long-term animal studies. In rodents given the compound for extended periods, researchers found an increased incidence of certain cancers, including liver and bladder tumors. These findings contributed to the discontinuation of clinical development. Whether similar risks apply to short-term or low-level exposure in humans is not established, and controlled human safety data are limited. The relevance of high-dose rodent carcinogenicity findings to human use remains a subject of debate.
=== The Major Intrinsic Protein Family (TC# 1.A.8) === The MIP family is large and diverse, possessing thousands of members that form transmembrane channels. These channel proteins function in transporting water, small carbohydrates (e.g., glycerol), urea, NH3, CO2, H2O2 and ions by energy-independent mechanisms. For example, the glycerol channel, FPS1p of Saccharomyces cerevisiae mediates uptake of arsenite and antimonite. Ion permeability appears to occur through a pathway different than that used for water/glycerol transport and may involve a channel at the 4 subunit interface rather than the channels through the subunits. MIP family members are found ubiquitously in bacteria, archaea and eukaryotes. Phylogenetic clustering of the proteins is primarily based according to phylum of the organisms of origin, but one or more clusters are observed for each phylogenetic kingdom (plants, animals, yeast, bacteria and archaea). MIPs are classified into five subfamilies in higher plants, including plasma membrane (PIPs), tonoplast (TIPs), NOD26-like (NIPs), small basic (SIPs) and unclassified X (XIPs) intrinsic proteins. One of the plant clusters includes only tonoplast (TIP) proteins, while another includes plasma membrane (PIP) proteins.
Ripeness — riper fruits contain more sugars, increasing GI Cooking methods — the more cooked, or overcooked, a food, the more its cellular structure is broken, with a tendency for it to digest quickly and raise blood glucose more Processing — e.g., flour has a higher GI than the whole grain from which it is ground as grinding breaks the grain's protective layers and with the length of storage. Potatoes are a notable example, ranging from moderate to very high GI even within the same variety. Consumption order — changing the order that foods are eaten was demonstrated to affect blood glucose levels, where eating starches or sugars first resulted in faster increases than when eaten after the rest of the meal More importantly, the glycemic response is different from one person to another, and also in the same person from day to day, depending on blood glucose levels, insulin resistance, and other factors. The glycemic index only indicates the impact on glucose level two hours after eating the food. People with diabetes have elevated levels for four hours or longer after eating certain foods.
The Liberal Party lacked a unified ideological base in 1906. It contained numerous contradictory and hostile factions, such as imperialists and supporters of the Boers; near-socialists and laissez-faire classical liberals; suffragettes and opponents of women's suffrage; antiwar elements and supporters of the military alliance with France. Nonconformists – Protestants outside the Anglican fold – were a powerful element, dedicated to opposing the established church in terms of education and taxation. However, the non-conformists were losing support amid society at large and played a lesser role in party affairs after 1900. The party, furthermore, also included Irish Catholics, and secularists from the labour movement. Many Conservatives (including Winston Churchill) had recently protested against high tariff moves by the Conservatives by switching to the anti-tariff Liberal camp, but it was unclear how many old Conservative traits they brought along, especially on military and naval issues. The middle-class business, professional and intellectual communities were generally strongholds, although some old aristocratic families played important roles as well. The working-class element was moving rapidly toward the newly emerging Labour Party. One uniting element was widespread agreement on the use of politics and Parliament as a device to upgrade and improve society and to reform politics. All Liberals were outraged when Conservatives used their majority in the House of Lords to block reform legislation.
Sources: en.wikipedia.org
The hormonal IUD is an extremely effective method of birth control, and a 2021 study demonstrated that it may be used for emergency contraception. In addition to birth control, the hormonal IUD is used for prevention and treatment of:
"Chemical Composition of Vintage Preban Absinthe with Special Reference to Thujone, Fenchone, Pinocamphone, Methanol, Copper, and Antimony Concentrations". Journal of Agricultural and Food Chemistry. 56 (9): 3073–3081. Bibcode:2008JAFC...56.3073L. doi:10.1021/jf703568f. PMID 18419128. Lachenmeier, Dirk W.; Walch, Stephan G.; Padosch, Stephan A.; Kröner, Lars U. (2006). "Absinthe – A Review". Critical Reviews in Food Science and Nutrition. 46 (5): 365–377. doi:10.1080/10408690590957322. PMID 16891209. S2CID 43251156.
== Conjunctival immune response == The conjunctiva covers the sclera, or whites of the eyes, as well as the insides of the eyelids and provides nutrients to underlying and surrounding tissue. The conjunctiva is also one of the closest vascularized tissues to the cornea. As such, it provides a major source of immune components in the cornea. Not only does the conjunctiva produce IgA, like the lacrimal glands, but it also contains macrophages, neutrophilic granulocytes, mast cells, lymphocytes, and other aspects of the general mucosal immune system. Like the rest of the MALT pathway, the conjunctiva has been found to possess lymphoid follicles, which develop at puberty and decline in old age, as well as diffuse lymphoid tissues. The conjunctiva also possess macrophages that play a part in modulating the T-cell immune response and mediating both the innate and acquired immune responses.
==== Suicide ==== LSD has led to suicide weeks or months after ingestion. LSD was originally categorized as a schedule I controlled substance because of the suicide of Diane Linkletter 6 months after she took LSD. There are several case reports of suicidal reactions to LSD.
Sources: en.wikipedia.org
Some infections, for example, those from the common cold and influenza, do not confer any long-lasting immunity. Such infections may give temporary resistance but do not give long-term immunity upon recovery from infection, and individuals become susceptible again.
The notochord is the defining feature (synapomorphy) of chordates, and was present throughout life in many of the earliest chordates. Although the stomochord of hemichordates was once thought to be homologous or from a common lineal origin, it is now viewed as analogous, convergent, or from a different lineal origin. Pikaia appears to have a proto-notochord, and notochords are present in several basal chordates such as Haikouella, Haikouichthys, and Myllokunmingia, all from the Cambrian. The Ordovician oceans included many diverse species of Agnatha and early Gnathostomata which possessed notochords, either with attached bony elements or without, most notably the conodonts, placoderms, and ostracoderms. Even after the evolution of the vertebral column in chondrichthyes and osteichthyes, these taxa remained common and are well represented in the fossil record. Several species (see list below) have reverted to the primitive state, retaining the notochord into adulthood, though the reasons for this are not well understood. Scenarios for the evolutionary origin of the notochord were comprehensively reviewed by Annona, Holland, and D'Aniello (2015). They point out that, although many of these ideas have not been well supported by advances in molecular phylogenetics and developmental genetics, two of them have actually been revived under the stimulus of modern molecular approaches:
The Tempest (2001) - Boatswain I Dreamt of Bombay (2002) - Bobby Girlfriends (2002) - Guy Hulk (2003) - Soldier Ball & Chain (2004) - Monty War of the Worlds (2005) - Boston Soldier Over There (2005) - Sergeant First Class Neeson Cold Case (2006) - Wes Floyd Veronica Mars (2007) I Gotta Be Better Than Keanu (2007) - Slimy Agent Scrubs (2001–2009) - Dr. Doug Murphy The Beast (2009) - Todd Jaracki
== See also == Lysergamide § Related compounds Substituted isotryptamine List of investigational hallucinogens and entactogens List of miscellaneous 5-HT2A receptor agonists Non-hallucinogenic 5-HT2A receptor agonist BOL-148 (2-bromo-LSD) and SPT-348 SDZ SER-082 DLX-0002700 LEK-8829 LSD-Quinoline
== Sequence == More than 100 AKH sequences are known. The typical makeup of hormones in this family includes a length between 8 and 10 amino acids, blocked N (pyroglutamic acid) and C (amidation) termini, with hydrophic residues at position 2, asparagine or threonine at position 3, phenylalanine or tyrosine at position 4, and serine or threonine at position 5. AKH sequence characteristics also include tryptophan at position 8 and in about two-thirds of the known AKHs, proline at position 6. AKHs can be modified (C-mannosylated tryptophan, proline hydroxylation, threonine phosphorylation, possible proline isomerisation, threonine O-sulfonation). Mass spectrometry is increasingly used for de novo sequencing of these hormones. Sequence prediction from genomic and transcriptomic data assist in hormone identification . AKH sequences differ slightly in insect families (Scarabaeoidea, Cucujiformia, Lepidoptera, Diptera, Hemiptera, Polyphaga).
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.
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.