PPARδ raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-11-13 and is reviewed periodically as new material appears.
Regulatory treatment varies, but cardarine is not approved as a medicine. Sports authorities list GW501516 as a prohibited substance, and it is banned at all times under the World Anti-Doping Agency code. Many countries restrict sales for human consumption, while online vendors market it as a research chemical. Such products may lack purity data, and their actual contents can differ from the label. Purchasing or possessing cardarine may carry legal consequences depending on jurisdiction. The compound is not a dietary supplement ingredient in regulated markets.
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.
GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | GW501516; GW-1516; endurobol | GW501516 is the research code |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator |
| Molecular formula | C21H18F3NO3S2 | Established chemical formula |
| Molar mass | 453.5 g/mol | Calculated from the formula |
| Regulatory status | Prohibited in sport; not approved as medicine | Status varies by country |
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.
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.
Cardarine is explicitly prohibited by the World Anti-Doping Agency under the class of PPARδ agonists. Its presence in urine or blood samples can be detected using mass spectrometry-based methods, often liquid chromatography-tandem mass spectrometry. Athletes who test positive may face sanctions, including bans from competition. The compound is also regulated as a prescription-only or unapproved drug in many countries. Enforcement varies by jurisdiction, and some regions treat it as a controlled substance. Online sales may occur despite these restrictions, creating quality and legal risks.
Laboratory detection of cardarine typically involves sample preparation followed by chromatographic separation and mass spectrometric identification. Urine is the most common matrix for anti-doping tests, though blood and hair have also been explored. Methods can target the parent compound or its metabolites, depending on the expected window of detection. Reference standards are required for accurate quantification. Matrix effects and dilution can influence results, so laboratories use internal standards and validation protocols. The exact detection window varies with dose, route, and individual metabolism.
A common misconception is that cardarine has been proven safe for human use. In reality, human clinical data are limited, and long-term animal studies have raised concerns about cancer. Another misconception is that it is a supplement or vitamin-like compound. It is a synthetic research chemical with no approved medical indication. Scientific discussion often focuses on its mechanism and detection rather than therapeutic use. Regulatory and anti-doping literature treats it primarily as a prohibited substance.
Cardarine is not approved for human therapeutic use in any major jurisdiction. It appears on the World Anti-Doping Agency Prohibited List as a PPARδ agonist within the hormone and metabolic modulators category. Sports organizations test for it because it has been detected in athlete samples and seized products. Regulatory actions against marketed research chemical versions have occurred in several countries, though enforcement varies. Availability through unregulated channels complicates oversight.
Analytical laboratories typically identify cardarine and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is a common matrix in anti-doping testing, while blood and tissue may be used in research settings. Detection windows depend on the assay, the sample matrix, and the compound's metabolism. Because cardarine is extensively metabolized, laboratories often target specific metabolites to improve sensitivity and confirmation. Reference standards are required for reliable quantification. Method validation includes checks for selectivity, linearity, and carryover.
A persistent misconception is that cardarine is a fat-burning drug or a safe alternative to anabolic steroids. No approved therapeutic product exists, and human safety data are limited. The tumor findings in rodents remain a central concern in scientific reviews. Products sold online may contain inaccurate labels, impurities, or different compounds entirely, which complicates any assessment of effects. Independent testing of such products has reported frequent mislabeling. For these reasons, discussions in the literature emphasize risks and unknowns rather than benefits.
=== Vector transmission === Diseases transmitted from human to human indirectly, i.e. malaria spread by way of mosquitoes, are transmitted through a vector. In these cases, the infection transfers from human to insect and an epidemic model must include both species, generally requiring many more compartments than a model for direct transmission.
=== August === 1 August: The second Donald Trump administration raises tariffs on New Zealand exports to the United States to 15 percent. Visual effects company Wētā FX proposes laying off 100 jobs in its support departments based in Wellington. 4 August: The New Zealand Government announces plans to scrap the National Certificate of Educational Achievement (NCEA) secondary school qualification. A name suppression order lapses for former Deputy Commissioner of Police Jevon McSkimming, who was charged in June 2025 with eight counts of possessing objectionable material including child sexual exploitation and bestiality over a four-year period. 5–6 August — An RNZAF C-130J Hercules evacuated three personnel of the United States National Science Foundation from McMurdo Station. 6 August: The Christchurch-based wool factory Wild Earth Yarns acquires the woollen dye house and spinning mill of the liquidated Napier-based company Design Spun. Hato Hone St John proposes scrapping various community voluntary programmes including hospital volunteers, community carers and pet therapy services as part of a review of its services; affecting about 1,100 people. 8 August – The Japanese Navy makes a stop-over in Wellington for the first time since 1936. 9–10 August – Prime Minister Luxon hosts Australian Prime Minister Anthony Albanese in Queenstown for annual bilateral head of government talks. 10 August — Gloriavale Christian Community's Overseeing Shepherd Howard Temple resigns after pleading guilty to 12 charges of sexual offending against women and girls last month.
== U == Ultradian rhythm A recurrent biological cycle that occurs more than once in 24 hours, such as stages of sleep. In neuroscience, it refers to shorter rhythms regulating hormonal release, arousal, or sleep cycles. Unconditioned response In classical conditioning, an automatic, reflexive response to an unconditioned stimulus (e.g., salivation to food). Studied in behavioral neuroscience. Unconsciousness A state in which an individual is not aware of themselves or their surroundings. Can result from head injury, anesthesia, or metabolic dysfunction. Uncus A structure on the medial surface of the temporal lobe, part of the parahippocampal gyrus. It is involved in olfaction and is adjacent to the amygdala. Undershoot The hyperpolarizing phase following an action potential where membrane potential temporarily becomes more negative than resting potential. Unilateral neglect A neuropsychological condition following damage (typically to the right parietal lobe) in which patients ignore stimuli on one side of space. Unipolar depression A mood disorder characterized by persistent low mood, lack of energy, and anhedonia, without manic episodes. Associated with altered activity in the prefrontal cortex and limbic structures. Unipolar neuron A type of neuron with a single process extending from the cell body. Common in invertebrates and found in human sensory neurons. Upper motor neuron A neuron originating in the cerebral cortex or brainstem that transmits motor signals to lower motor neurons. Damage leads to spasticity, hyperreflexia, and weakness.
Sources: en.wikipedia.org
This is where microfluidics can have an impact: The lithography-based production of microfluidic devices, or more likely the production of reusable molds for making microfluidic devices using a molding process, is limited to sizes much smaller than traditional machining. Critical dimensions down to 1 μm are easily fabricated, and with a bit more effort and expense, feature sizes below 100 nm can be patterned reliably as well. This enables the inexpensive production of pores integrated in a microfluidic circuit where the pore diameters can reach sizes of order 100 nm, with a concomitant reduction in the minimum particle diameters by several orders of magnitude. As a result, there has been some university-based development of microfluidic particle counting and sizing with the accompanying commercialization of this technology. This method has been termed microfluidic resistive pulse sensing (MRPS).
== Function == LepA is suspected to improve the fidelity of translation by recognizing a ribosome with mistranslocated tRNA and consequently inducing a back-translocation. By back-translocating the already post-transcriptionally modified ribosome, the EF-G factor capable of secondary translocation. Back-translocation by LepA occurs at a similar rate as an EF-G-dependent translocation. As mentioned above, EF-G's structure is highly analogous to LepA's structure; LepA's function is thus similarly analogous to EF-G's function. However, Domain IV of EF-G has been shown through several studies to occupy the decoding sequence of the A site after the tRNAs have been translocated from A and P sites to the P and E sites. Thus, domain IV of EF-G prevents back-movement of the tRNA. Despite the structural similarities between LepA and EF-G, LepA lacks this Domain IV. Thus LepA reduces the activation barrier between Pre and POST states in a similar way to EF-G but is, at the same time, able to catalyze a back-translocation rather that a canonical translocation.
However, Casey withdrew from the event due to an undisclosed medical reason and was replaced by Gabriella Fernandes. On September 14, 2023, Casey had accepted a 4–month suspension by USADA after she reported herself in June 2023 for taking the prohibited substance BPC-157 to treat a medical condition. She is able to compete again as of October 1, 2023. On September 19, 2023, it was reported that Casey was removed from UFC roster.
== Side effects == Miconazole is generally well tolerated. The oral gel can cause dry mouth, nausea and an unpleasant taste in about 1–10% of people. Anaphylactic reactions are rare. The drug prolongs the QT interval.
Sources: en.wikipedia.org
No. Cardarine is GW501516, a PPARδ agonist, while SARMs act on androgen receptors. The two classes are often grouped in informal discussions despite different mechanisms.
No. It has no approved medical indication in any country. Regulatory agencies have not cleared it for treatment or prevention of any condition.
Early clinical work stopped after rodent carcinogenicity findings. Those animal results raised concerns about long-term human risk, although direct human evidence is lacking. The human relevance of the tumors remains an open scientific question.
It targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not act primarily on androgen receptors. This distinction separates it from SARMs.