GW501516 is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-03-17. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual description for typical solid reference material. |
| Solubility | Poorly soluble in water; soluble in DMSO | Solubility depends on solvent, purity, and form. |
| Storage | Cool, dry, protected from light | Long-term storage often uses low temperature and desiccant. |
| Common analytical method | LC-MS/MS | Used for detection and quantification in biological matrices. |
| Common synonyms | GW-501516; GW501516; endurobol | Naming varies among literature, vendors, and databases. |
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.
Clinical development stopped after rodent studies showed tumors at multiple sites. Whether those findings predict human cancer risk remains an open question, but they led sponsors to discontinue programs. Human safety data are limited to small, short-term studies that were not designed to assess cancer risk. Reported effects in those studies included changes in blood lipids, but the evidence is insufficient for medical use. Long-term consequences of nonmedical use are not well characterized. Questions about dose, duration, and individual susceptibility remain unresolved.
Cardarine is a common name for GW501516, an investigational compound developed in the 1990s for metabolic conditions. It acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in lipid and energy metabolism. The compound is frequently mislabeled as a selective androgen receptor modulator, or SARM, but its molecular target is different. GW501516 reached early clinical testing before development was discontinued. It has no approved therapeutic use in any country. The name cardarine is not a formal international nonproprietary name.
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
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.
=== Genetics === Family history of ischemic heart disease or MI, particularly if one has a male first-degree relative (father, brother) who had a myocardial infarction before age 55 years, or a female first-degree relative (mother, sister) less than age 65 increases a person's risk of MI. Genome-wide association studies have found 27 genetic variants that are associated with an increased risk of myocardial infarction. The strongest association of MI has been found with chromosome 9 on the short arm p at locus 21, which contains genes CDKN2A and 2B, although the single nucleotide polymorphisms that are implicated are within a non-coding region. The majority of these variants are in regions that have not been previously implicated in coronary artery disease. The following genes have an association with MI: PCSK9, SORT1, MIA3, WDR12, MRAS, PHACTR1, LPA, TCF21, MTHFDSL, ZC3HC1, CDKN2A, 2B, ABO, PDGF0, APOA5, MNF1ASM283, COL4A1, HHIPC1, SMAD3, ADAMTS7, RAS1, SMG6, SNF8, LDLR, SLC5A3, MRPS6, KCNE2.
Also, during the 1981 tour, veteran session drummer Andy Newmark stepped in briefly for Knudsen, who was then in rehab. And by the end of 1981, even Simmons had left the band. Now with no remaining original members and a "leader" in McDonald who was ready for a solo career, the group elected instead to disband after a rehearsal without Simmons, according to an interview with McDonald for Listen to the Music, the Doobie Brothers' official video history/documentary released in 1989. He went on to say that by that point they could not have gotten further away from the Doobies sound if they had tried. Simmons, already at work on his first solo album, Arcade, rejoined for a 1982 farewell tour on the condition that this truly would be the end of the Doobie Brothers. At their last concert at the Greek Theatre in Berkeley, California, on September 11, 1982, they were joined onstage by founding member Tom Johnston for what was presumed to be the final rendition of his staple, "China Grove". Former members Porter, Hossack and Hartman subsequently took the stage for an extended version of "Listen to the Music". Knudsen sang lead vocals while Johnston, Simmons and McFee traded licks on guitar. The live album Farewell Tour was released in 1983 and the Greek Theatre concert was released in 2011 as Live at the Greek Theatre 1982.
Elemental sulfur is one of the oldest fungicides and pesticides. "Dusting sulfur", elemental sulfur in powdered form, is a common fungicide for grapes, strawberry, many vegetables and several other crops. It has a good efficacy against a wide range of powdery mildew diseases as well as black spot. In organic production, sulfur is the most important fungicide. It is the only fungicide used in organically farmed apple production against the main disease apple scab under colder conditions. Biosulfur (biologically produced elemental sulfur with hydrophilic characteristics) can also be used for these applications. Standard-formulation dusting sulfur is applied to crops with a sulfur duster or from a dusting plane. Wettable sulfur is the commercial name for dusting sulfur formulated with additional ingredients to make it water miscible. It has similar applications and is used as a fungicide against mildew and other mold-related problems with plants and soil. Elemental sulfur powder is used as an "organic" (i.e., "green") insecticide (actually an acaricide) against ticks and mites. A common method of application is dusting the clothing or limbs with sulfur powder. A diluted solution of lime sulfur (made by combining calcium hydroxide with elemental sulfur in water) is used as a dip for pets to destroy ringworm (fungus), mange, and other dermatoses and parasites. Sulfur candles of almost pure sulfur were burned to fumigate structures and wine barrels, but are now considered too toxic for residences.
== Uses == Acetamide is used as a plasticizer and an industrial solvent. Molten acetamide is good solvent with a broad range of applicability. Notably, its dielectric constant is higher than most organic solvents, allowing it to dissolve inorganic compounds with solubilities closely analogous to that of water. Acetamide has uses in electrochemistry and the organic synthesis of pharmaceuticals, pesticides, and antioxidants for plastics. It is a precursor to thioacetamide.
=== Pharmacodynamics === 3,4-DMA has been assessed in various biochemical and preclinical studies. Its affinity (Ki) for the rat serotonin 5-HT2A receptor has been assessed and was found to be 43,300 nM. For comparison, the affinity of para-methoxyamphetamine (PMA) was 33,600 nM, of 2,5-dimethoxyamphetamine (2,5-DMA) was 5,200 nM, and of 2,5-dimethoxy-4-methylamphetamine (DOM) was 100 nM in the same study. 3,4-DMA also showed affinity for the 5-HT1 receptor (Ki = 64,600 nM). The drug has additionally been found to be a monoamine oxidase inhibitor (MAOI), with an IC50Tooltip half-maximal inhibitory concentration of 20,000 nM for monoamine oxidase A (MAO-A), whereas it was inactive at monoamine oxidase B (MAO-B) (IC50 > 100,000 nM). 3,4-DMA does not produce hyperlocomotion and hence lacks stimulant-like effects in rodents. It also fails to produce stimulus generalization to dextroamphetamine in rodent drug discrimination tests, likewise suggesting that it lacks stimulant- or amphetamine-like effects. The drug partially but incompletely substituted for DOM in rodents, suggesting that it may lack psychedelic-like effects. 3,4-DMA partially to fully substituted for partially to fully substituted for PMMA, MDMA, and MDA in rodents, suggesting that it may have entactogen-like effects.
Sources: en.wikipedia.org
In the brain, the canonical mechanism of CB1 receptor activation is a form of short-term synaptic plasticity initiated via retrograde signaling of endogenous CB1 agonists such as 2AG or AEA (two primary endocannabinoids). This mechanism of action is called depolarization-induced suppression of inhibition (DSI) or depolarization-induced suppression of excitation (DSE), depending on the classification of the presynaptic neuron acted upon by the retrograde messenger (see diagram at left). In the case of CB1R agonism on the presynaptic membrane of a GABAergic interneuron, activation leads to a net effect of increased activity, while the same activity on a glutamatergic neuron leads to the opposite net effect. The release of other neurotransmitters is also modulated in this way, particularly dopamine, dynorphin, oxytocin, and vasopressin.
Hexin Instrument Co., Ltd (Guangzhou, China) commercialized a portable ion trap mass spectrometer DT-100 in 2017 for VOC monitoring. The mass spectrometer employs a VUV photo ionization source and a digital linear ion trap as mass analyzer. With an overall weight of 13 kg and size of 350 x 320 x 190 mm3 including the rechargeable Li battery. The specification includes a mass range of 20–500 Th for both MS and MS2, and mass resolving resolution of 0.3 Th (FWHM) at 106 Th.
Since the release of the Source engine SDK, a large number of modifications (mods) have been developed by the Half-Life 2 community. Mods vary in scale, from fan-created levels like Minerva and weapons, to partial conversions such as Rock 24, Half-Life 2 Substance and SMOD (which modify the storyline and gameplay of the pre-existing game), SourceForts and Garry's Mod (which allow the player to experiment with the physics system in a sandbox mode), to total conversions such as Black Mesa, Dystopia, Zombie Master or Iron Grip: The Oppression, the last of which transforms from a first-person shooter into a real-time strategy game. Some mods take place in the Half-Life universe; others in completely original settings. Many more mods are still in development, including Lift, The Myriad, Operation Black Mesa, and Infinite Finality. Several multiplayer mods, such as Pirates, Vikings and Knights II, a predominately sword-fighting game; Insurgency: Modern Infantry Combat, which focuses on realistic modern infantry combat; and Jailbreak Source have been opened to the public as a beta. In September 2022, after a decade of development, fans released Half-Life 2: VR Mod, allowing Half-Life 2 to be played in virtual reality. As part of its community support, Valve announced in September 2008 that several mods, with more planned in the future, were being integrated into the Steamworks program, allowing the mods to make full use of Steam's distribution and update capabilities. Half-Life 2 introduced a community workshop as part of their 20th-anniversary update.
== Chemistry == Valproic acid is a branched short-chain fatty acid (SCFA) and the 2-n-propyl derivative of valeric acid (valerate; pentanoic acid; pentanoate). It is also a GABA analogue, or analogue of the inhibitory neurotransmitter γ-aminobutyric acid (GABA). Other analogues of valproic acid include valproate pivoxil, valpromide, and valnoctamide.
Sources: en.wikipedia.org
Joseph Abram, Le Havre: Modern City, 2011 Nathalie Castetz, Le Havre, Seine Estuary, Paris, Héliopoles, 2012, ISBN 978-2-919006-10-6 Franck Godard and Olivier Bouteiller, Le Havre, Déclics, 2011, ISBN 978-2-84768-231-1 Unusual Le Havre, Renée Grimaud, Les beaux jours, 2012, ISBN 978-2-35179-101-1 Jean-François Massé, Le Havre, attached port, Acanthe, 2003, ISBN 2-84942-003-4 Tristan Gaston-Breton, Le Havre 1802–2002: Two centuries of economic adventure, Le Cherche midi, 2002, ISBN 2-7491-0028-3 E. Simon, A. Fiszlewicz, Le Havre: What an Estuary!, Petit à Petit, 2002, ISBN 2-914401-26-4 Madeleine Brocard, Atlas of the Estuary of the Seine, Rouen, Presses de l'université de Rouen, 1996 Emanuelle Real, The Industrial Landscape of Basse-Seine, Connaissance du patrimoine en Haute-Normandie, 2009, ISBN 2-910316-33-5, 264 pages Jacques Basile and Didier Guyot, Another Blue City, Editions Point de Vues, 2011, 120 pages, ISBN 978-2-915548-63-1
The study determined that eudaimonically oriented participants reported their parents had been both demanding and responsive towards them. A multiple regression showed that demandingness and responsiveness together explained as much as twenty-eight percent of the variance in eudaimonia, this suggests parenting played a major role in the development of this pursuit. This supported the expectation that eudaimonia is cultivated when parents encourage internal structure, self-discipline, responsibility, and vision, and simultaneously fulfill a child's needs for autonomy. The research concludes that parents who want their children to experience eudaimonia must firstly themselves "mentor" their children in the approaches to attain eudaimonia. To encourage eudaimonia verbally is not sufficient to suffice eudaimonia into adulthood. Parents must clearly role model eudaimonia for it to truly be present in the child's life.
The French are also known for their violet syrup, most commonly made from an extract of violets. In the United States, this French violet syrup is used to make violet scones and marshmallows. Viola essence flavours the liqueurs Creme Yvette, Creme de Violette, and Parfait d'Amour. It is also used in confectionery, such as Parma Violets and C. Howard's Violet candies.
== Discovery == NAPE-PLD is an enzyme activity - a phospholipase, acting on phospholipids found in the cell membrane. It is not homology but the chemical outcome of its activity that classes it as phospholipase D. The enzymatic activity was discovered and characterized in a series of experiments culminating in the 2004 publication of a biochemical purification scheme from which peptide sequencing could be accomplished. Researchers homogenized (finely ground) hearts from 150 rats and subjected the resulting crude lysate to sucrose sedimentation at 105,000 x g to separate the cell membranes from the remainder of the cell. The integral membrane proteins were then solubilized using octyl glucoside and subjected to four column chromatography steps (HiTrap SP HP cation-exchange column, HiTrap Q anion-exchange column, HiTrap Blue affinity column, Bio-Gel HTP hydroxyapatite column). Each of these separates the different types of membrane proteins into different sample containers when the proteins are eluted from the column over time, and by measuring the activity of samples in each container it was possible to track which ones received the active enzyme. Measurement of the enzyme activity was done by thin layer chromatography of a radioactive substrate sensitive to the NAPE-PLD enzymatic activity: Cleavage of the substrate affected where it appeared on the plate when the radiation was detected on a bioimaging analyzer.
==== Elsewhere ==== In Australia, the labourist and socialist movements were gaining traction and the Australian Labor Party (ALP) was formed in Barcaldine, Queensland in 1891 by striking pastoral workers. In 1889, a minority government led by the party was formed in Queensland, with Anderson Dawson as the Premier of Queensland, where it was founded and was in power for one week, becoming the world's first government led by democratic socialists. The ALP has been the main driving force for workers' rights and the welfare state in Australia, backed by Australian trade unions, in particular the Australian Workers' Union. Brazil’s First Socialist Congress occurred in Rio de Janeiro in 1902. Later that year, in São Paulo, another Socialist Congress took place and the Workers' Socialist Party (Partido Operário Socialista) was founded, considered to be the first socialist party in Brazil. In 1895, the Socialist Workers Party (Partido Socialista Operário) was founded. That same year, Silvério Fontes, considered the first Brazilian Marxist, launched the Socialist Center of Santos, which soon published the socialist magazine A Questão Social (The Social Question) and newspaper O Socialista (The Socialist).
Sources: en.wikipedia.org
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.
Most methods use liquid chromatography with tandem mass spectrometry. Urine is common in anti-doping testing, and blood or plasma may be used in research.
Typical guidance is cool, dry, dark storage, often at low temperature and with desiccant. Stability data are limited, so storage conditions should be verified for each batch or supplier.
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.