Everything below concerns Mass spectrometry. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-01-31. Numbers and descriptions here follow the published literature rather than marketing material.
Cardarine is frequently described as a fat-burning or endurance-enhancing supplement, but these claims exceed the available evidence. The compound is not a hormone, steroid, or selective androgen receptor modulator. Research articles discuss it as a tool compound for studying PPARδ biology, while anti-doping literature focuses on its abuse and detection. Quality of unapproved products is uncertain, and independent analyses have found impurities or incorrect labeling. Open questions include whether human cancer risk resembles that seen in rodents and how often non-athletes use the substance.
Cardarine has no approved therapeutic indication and is not marketed as a medicine. The World Anti-Doping Agency lists GW501516 as a prohibited substance at all times, covering both in-competition and out-of-competition periods. National laws vary: some countries treat it as an unapproved drug subject to import controls, while others have specific restrictions on sale for human consumption. It is often sold as a research chemical, a label that does not imply safety or legality. Enforcement actions have targeted online vendors and shipments.
Quality assessment for cardarine samples usually combines identity, purity, and impurity testing. Nuclear magnetic resonance spectroscopy and mass spectrometry can confirm molecular structure, while high-performance liquid chromatography estimates purity. Certificates of analysis from testing laboratories may list these results, but they do not establish safety or legality. In the absence of approved manufacturing, products sold online may contain the wrong compound, variable amounts, or unlisted contaminants. Independent verification is therefore central to analytical work and to interpreting any reported biological activity.
Laboratory detection of GW501516 commonly uses liquid chromatography coupled with tandem mass spectrometry. The method can identify the parent compound or its metabolites in urine and blood after sample cleanup. Protein precipitation, solid-phase extraction, or enzymatic hydrolysis may precede analysis, depending on the matrix. Reference standards are required for accurate quantification and confirmation. Because the compound is not approved, testing often occurs in anti-doping, forensic, or research settings rather than routine clinical care. Results are reported with limits of detection and quantification.
Stability of GW501516 depends on form, temperature, light exposure, and moisture. Solid reference material is typically stored frozen or refrigerated in a desiccator and protected from light. Solutions in organic solvents such as dimethyl sulfoxide are often kept frozen in aliquots to reduce freeze-thaw cycling. Aqueous solubility is low, so aqueous stock solutions can be difficult to prepare without cosolvents. Degradation may appear as changes in chromatographic purity or mass spectral signal. Stability studies are needed to establish shelf life for any specific preparation.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport; not approved as medicine | Listed by WADA at all times. |
| Common synonyms | GW501516, GW-501516, endurobol | Cardarine is a colloquial name. |
| Typical analytical method | LC-MS/MS | Detects parent compound and metabolites. |
| Common test matrix | Urine | Blood and dried blood spots also possible. |
| Legal classification | Varies by country | Often treated as unapproved drug or research chemical. |
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.
Cardarine is the common name for GW501516, a synthetic compound studied as a peroxisome proliferator-activated receptor delta agonist. Researchers developed it to explore treatments for lipid disorders and metabolic conditions. It is not an approved medicine in any country. Early clinical work examined changes in HDL cholesterol and triglycerides, but development was discontinued after animal studies raised concerns about cancer. The compound remains available as a research chemical and appears in discussions of performance enhancement.
At the molecular level, GW501516 binds and activates PPARδ, a nuclear receptor that regulates transcription. Activation shifts expression of genes involved in fatty acid oxidation, energy expenditure, and lipid transport in skeletal muscle and liver. Animal studies report increased endurance and altered lipid profiles after exposure. Human data are limited to small trials and do not establish long-term safety or efficacy. PPARδ also has roles in cell proliferation, so the relationship between activation and cancer risk remains an open question.
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.
GW501516 acts on PPARδ, a nuclear receptor that helps regulate fatty acid oxidation and energy homeostasis. In animal studies, activation of this receptor was associated with increased endurance and changes in lipid metabolism. Human trials examined effects on blood lipids and other metabolic markers, but the compound did not advance to approval. Rodent studies later reported tumors in multiple tissues at doses used in those experiments. Whether those findings translate to human risk remains uncertain, and the clinical relevance of the animal data is still debated.
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.
expedited border control programme for low-risk travellers holding Canadian or U.S. citizenship or permanent residence. Membership requires approval by Canadian and U.S. authorities and entitles members to dedicated RFID-enabled lanes when crossing the land border. A NEXUS card can also be utilised as a travel document between the two countries and entitles passengers to priority border control facilities in Canada and Global Entry facilities in the U.S. Free and Secure Trade (FAST) is a similar programme for commercial drivers and approved importers, reducing the amount of customs checks conducted at the border and expediting the border control process. When entering the U.S. by air, holders of NEXUS cards may use Global Entry kiosks to clear border controls at participating airports SENTRI: SENTRI is a programme similar to NEXUS for U.S. and Mexican citizens that also allows members to register their cars for expedited land-border controls. Unlike NEXUS, SENTRI is administered solely by the American government and does not provide expedited controls when entering Mexico. When entering the United States by land from Canada, a NEXUS card can be used, but not the other way around. Individuals holding a NEXUS card may additionally register their cars for expedited land border controls under SENTRI. When entering the United States by air, holders of SENTRI cards may use Global Entry kiosks to clear border controls at participating airports
peroxisome A small membrane-bound organelle found in many eukaryotic cells which specializes in carrying out oxidative reactions with various enzyme peroxidases and catalase, generally to mitigate damage from reactive oxygen species but also as a participant in various metabolic pathways such as beta-oxidation of fatty acids.
== Side effects == The most serious side effect is frequent hepatotoxicity which prompted regulatory agencies to issue several warnings and restrictions. Flupirtine is devoid of negative psychological or motor function effects, or effects on reproductive function.
=== Selected articles === White, S. H. (1986). The physical nature of planar bilayer membranes. In Ion Channel Reconstitution (Chris Miller, Ed.). Plenum Press: New York. pp. 3–35. Wiener, M. C. and White, S. H. (1992). The structure of a fluid dioleoylphosphatidylcholine bilayer determined by joint refinement using x-ray and neutron diffraction data. III. The complete structure. Biophys. J. 61:434–447. White, S. H., Wimley, W. C., Ladokhin, A. S., and Hristova, K. (1998). Protein folding in membranes: Determining the energetics of peptide–bilayer interactions. Methods Enzymol. 295:62–87. White, S. H. and Wimley, W. C. (1999). Membrane protein folding and stability: Physical principles. Annu. Rev. Biophys. Biomolec. Struct. 28:319–365 Hessa, T., Meindl-Beinker, N. M., Bernsel, A., Kim, H., Sato, Y., Lerch, M. B., Nilsson, I., White, S. H., and von Heijne, G. (2007). The molecular code for transmembrane-helix recognition by the Sec61 translocon. Nature 450:1026-1030. Cymer, F., von Heijne, G., & White S.H. (2015). Mechanisms of integral membrane protein insertion and folding. J Mol Biol 427:999-1022. Roussel, G., Lindner, E., & White, S. H. (2022). Topology of the SecA ATPase Bound to Large Unilamellar Vesicles. Journal of Molecular Biology, 434(12), 167607.
(Feb 2011) found that, "The increase in zeaxanthin appears to surpass the decrease in violaxanthin in spinach" and commented that the discrepancy could be explained by "a synthesis of zeaxanthin from beta-carotene", however they noted further study is required to explore this hypothesis.
Sources: en.wikipedia.org
===== Accelerated hair re-growth ===== Hair returns to the brand site with the next hair cycle in darker animals, but the loss after a month is permanent for pale-coated animals. Around two months after branding white hair will begin to grow on darker animals. This white hair often grows much more quickly than the rest of the coat and may eventually grow long enough to overlap the surrounding, pigmented hair. This boost occurs because growth follicles no longer compete for energy with the dormant or dead melanocytes. Under normal conditions, this competition is one of the key checks on the speed of hair growth.
Hypoglycemia Epinephrine (via β2, α2, and α1 adrenergic receptors) Arginine Alanine (often from muscle-derived pyruvate/glutamate transamination (see alanine transaminase reaction). Acetylcholine Cholecystokinin Gastric inhibitory polypeptide Gastrin Secretion of glucagon is inhibited by:
== Reception == Spin wrote, "Poised to become this year's Scorpions, the band (like so many other freeze-dried HM acts) looks more like Spinal Tap. Metal Heart reeks of studied moves. The squalling guitars and lockstep beat on Metal Heart are characteristic Eurometal trademarks. Accept is just another commodity."
Chloramphenicol has also been isolated from the moon snail Lunatia heros, although it has not been investigated whether the biosynthesis is carried out by the snail itself or by associated microorganisms. Also the biosynthetic gene cluster and pathway for chloroamphenicol was characterized from Streptomyces venezuelae ISP5230 (ATCC 17102). Currently the chloramphenicol biosynthetic gene cluster has 17 genes with assigned roles.
Sources: en.wikipedia.org
Legal status varies by country. It is not approved as a medicine, and it is prohibited in sport. Some jurisdictions restrict import, sale, or possession.
Laboratories use liquid chromatography-tandem mass spectrometry to detect GW501516 and its metabolites. Urine is commonly tested, and testing can occur in and out of competition.
No, cardarine is not a SARM. It is a PPARδ agonist, which acts on a different receptor. The two classes are often confused in online discussions.
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.