Prohibited list 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 2025-10-15 and is reviewed periodically as new material appears.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Prohibited in sport | Listed by WADA as a metabolic modulator. |
| Approved medical use | None in major jurisdictions | Not a registered drug. |
| Common test matrix | Urine | Most anti-doping samples use urine. |
| Typical detection method | LC-MS/MS | Detects parent compound and metabolites. |
| Reference standard storage | -20 °C, desiccated | Typical for analytical standards. |
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.
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.
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.
Published studies have examined GW501516 in animal models of obesity, insulin resistance, and exercise endurance. Early human trials reportedly ended, and development was discontinued after preclinical findings raised concerns about cancer in some rodent studies. Regulatory agencies have not approved cardarine for any medical use. Its availability through non-pharmaceutical channels raises questions about identity, purity, and legal status that are separate from its laboratory pharmacology. Those questions are often addressed through analytical testing rather than assumptions about product labels.
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.
=== Sodium ion channels === Sodium channels were the first voltage-gated ion channels to be isolated in 1984 from the eel Electrophorus electricus by Shosaku Numa. The pufferfish toxin tetrodotoxin (TTX), a sodium channel blocker, was used to isolate the sodium channel protein by binding it using the column chromatography technique for chemical separation. The amino acid sequence of the protein was analyzed by Edman degradation and then used to construct a cDNA library which could be used to clone the channel protein. Cloning the channel itself allowed for applications such as identifying the same channels in other animals. Sodium channels are known for working in concert with potassium channels during the development of graded potentials and action potentials. Sodium channels allow an influx of Na+ ions into a neuron, resulting in a depolarization from the resting membrane potential of a neuron to lead to a graded potential or action potential, depending on the degree of depolarization.
Irving Langmuir was the first to derive a scientifically based adsorption isotherm in 1918. The model applies to gases adsorbed on solid surfaces. It is a semi-empirical isotherm with a kinetic basis and was derived based on statistical thermodynamics. It is the most common isotherm equation to use due to its simplicity and its ability to fit a variety of adsorption data. It is based on four assumptions:
=== Interactions === There were eight interactions identified by Mentha. The first one was UFSP2 which hydrolyzes the peptide bond at the C-term gly of UFM1, a ubiquitin-like modifier protein bound to a number of target proteins. The second one was HSCB which acts as a co-chaperone in iron-sulfur cluster assembly in mitochondria. The third was GRB2 which is an adapter protein that provides a critical link between cell surface growth factor receptors and the Ras signaling pathway. The fourth was CYLD which is a protease that cleaves Lys-63-linked polyubiquitin chains, controls regulation of cell survival, proliferation, and differentiation, and is required for normal cell cycle progress. The fifth was ATM which activates checkpoint signaling upon double strand breaks, apoptosis, and genotoxic stress. The sixth was FAM177A1, the function of which is unknown. The last two were THID2 and Q81kP6 which are both in bacillus anthracis.
=== Challenges and Tensions Following the Accord === Despite the agreements reached, tensions persisted. While the MNLA adhered to its commitment to not disrupt the presidential elections, sporadic violence continued in Kidal and surrounding areas. On July 18, 2013, clashes broke out between pro-Mali and pro-Azawad demonstrators. Further unrest followed after Ibrahim Boubacar Keïta was elected President of Mali in August 2013, with new confrontations emerging between the MNLA and Malian forces. Although the Ouagadougou Accords paved the way for the elections, they failed to resolve the deeper issues of political and territorial control. Negotiations on the long-term status of northern Mali, particularly regarding the autonomy of the Azawad region, stalled. The Malian government, led by President Keïta, resisted discussions on granting autonomy to the Tuareg-majority regions, contributing to a growing sense of frustration among northern factions. By September 2013, the MNLA accused the Malian government of failing to honour its commitments under the Ouagadougou Accords, particularly regarding the cantoning of rebel fighters and the release of prisoners. This led to a suspension of negotiations by the MNLA, HCUA, and the Arab Movement of Azawad (MAA) by the end of the month. Clashes continued sporadically throughout late 2013, with further incidents in Ménaka and Kidal in November. In January 2014, Algeria attempted to broker a new round of negotiations. Although some progress was made, the MNLA and its allies remained sceptical of the Malian government's intentions.
=== Individual protein immunoprecipitation (IP) === Involves using an antibody that is specific for a known protein to isolate that particular protein out of a solution containing many different proteins. These solutions will often be in the form of a crude lysate of a plant or animal tissue. Other sample types could be body fluids or other samples of biological origin.
Sources: en.wikipedia.org
== Biomembranes and phospholipid bilayers == Biological membranes are found in both prokaryotic and eukaryotic cells. They surround cells and organelles with a semi-permeable barrier that prevents free flow of substances. The membrane consists of a phospholipid bilayer structure and often embedded or otherwise associated proteins, along with cholesterol and glycolipids. The phospholipid bilayer is a two-layer structure mainly composed of phospholipids, which are amphiphilic molecules that have hydrophilic and hydrophobic regions. The hydrophilic region contains the polar head group. This region is exposed to aqueous substances located mainly in the exterior portion of the biomembrane. The hydrophobic region consists of the non-polar acyl chains or fatty acids groups facing the interior of the biomembrane. Phospholipids consist of two non-polar hydrocarbon chains with ester or ether bonds to the phosphate group which is also linked by ester or ether bonds to the polar hydrophilic region. The phospholipid carries a negative charge due to the presence of the phosphate group. Its overall polarity depends on the charges of the hydroxyl groups or alcohols such as choline, ethanolamine, inositol, serine, etc. attached to the phosphate group. There are six basic functions that are associated with biomembranes:
=== Research tool === Due to its high proteolytic specificity, thrombin is a valuable biochemical tool. The thrombin cleavage site (Leu-Val-Pro-Arg-Gly-Ser) is commonly included in linker regions of recombinant fusion protein constructs. Following purification of the fusion protein, thrombin can be used to selectively cleave between the arginine and glycine residues of the cleavage site, effectively removing the purification tag from the protein of interest with a high degree of specificity.
This cylindrical representation of the incompressible Navier–Stokes equations is the second most commonly seen (the first being Cartesian above). Cylindrical coordinates are chosen to take advantage of symmetry, so that a velocity component can disappear. A very common case is axisymmetric flow with the assumption of no tangential velocity (
The governor of Minas Gerais, Romeu Zema, said he hoped that Maduro's downfall would allow Venezuela to "rediscover peace, stability and the path to development". The governor of Goiás, Ronaldo Caiado, said that "this 3 January goes down in history as the day of the liberation of the Venezuelan people, who have lived for more than 20 years under a"Chavista narco-dictatorship". Senator Flávio Bolsonaro (PL-RJ) publicly celebrated the capture of Maduro by the United States, describing the event as a historic milestone for freedom and democracy. He said that Venezuela had become one of the most extreme examples of "how an authoritarian regime can destroy a nation". Michelle Bolsonaro, former First Lady of Brazil and the president of the women's movement under the Liberal Party, PL Mulher, stated that the U.S. action represents the "beginning of the end of the authoritarian and criminal regime" of Venezuela and a message for "dictators disguised as democrats and defenders of drug traffickers".
Sources: en.wikipedia.org
Legal status varies by country, but cardarine is not approved as a medicine in major jurisdictions. It is often sold as a research chemical, a category that may not be lawful for human use. Buyers should check local laws and product labels carefully.
Anti-doping laboratories use LC-MS/MS to detect GW501516 and its metabolites, usually in urine. The method can identify the parent compound at low concentrations. Detection windows vary with dose and individual factors.
No, cardarine has no approved medical uses in major jurisdictions. Early research explored metabolic conditions, but those programs were discontinued. It is not a registered treatment for any disease.
No. Cardarine has not received approval for human therapeutic use in major jurisdictions. It remains an investigational compound.