Everything below concerns PPARδ agonist. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-10-08. Numbers and descriptions here follow the published literature rather than marketing material.
Preclinical research reported that GW501516 increased running endurance in mice and improved lipid profiles in some animal species. Early human trials explored effects on high-density lipoprotein cholesterol, triglycerides, and glucose handling, but the program was discontinued. Published human data are sparse and do not establish efficacy for any condition. Studies also examined PPAR delta in cancer biology, with conflicting findings across models. The relationship between receptor activation, tissue context, and disease risk remains an active area of investigation.
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular target | PPAR delta (NR1C2) | Ligand-activated nuclear receptor. |
| Primary tissues studied | Skeletal muscle, liver, adipose | Effects on fatty acid oxidation and energy use. |
| Typical detection matrix | Urine | Used in anti-doping analysis. |
| Common analytical method | LC-MS/MS | Detects parent compound and metabolites. |
| Sport regulatory class | Prohibited at all times | Listed as a metabolic modulator by WADA. |
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.
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.
Wounded healer is a term created by psychiatrist Carl Jung. The idea states that an analyst is compelled to treat patients because the analyst himself is "wounded." The idea may have Greek mythology origins. Victor et al. (2022) found that 82% of applied psychology graduate students and faculty members in the United States and Canada experienced mental health conditions at some point in their lives. As an example, of the "wounded healer phenomenon" between an analyst and their analyzed:
=== Backing fabrics === In these cases, a backing fabric can be used. Backing fabrics must be durable and able to withstand tensioned in order to offer support, but not so heavy that it causes strain on the original textile. The fabric should extend beyond the damaged areas in combination with appropriate stitching in weak areas when used in combination with local repairs and visual compensation techniques.
A ban on the sale of some single use plastic items, such as cutlery, plates and drinking straws, comes into force in Wales. 31 October Plans to close hundreds of rail ticket offices in England are scrapped. Secretary of State for Transport Mark Harper says the government "has asked train operators to withdraw their proposals" because they "failed to meet high passenger standards". This follows a public consultation into the cost-cutting proposals, which attracted 750,000 responses, in which 99% were objections. Lee Cain, the former Downing Street Director of Communications, gives evidence at the second phase of the COVID-19 public inquiry. He states: "I don't think there was any clarity of purpose, any really serious outlined plan to deal with Covid at that particular point and I think that was the core failure," and says the pandemic was the "wrong crisis" for Boris Johnson's "skill set". The UK government confirms that American XL Bully dogs have been added to the banned list under the Dangerous Dogs Act 1991, and that from 1 February 2024 it will become illegal to own one in England and Wales unless the owner has successfully applied for the dog to be exempt.
Hunger has been a perennial human problem. However, until the early 20th century, there was relatively little awareness of the qualitative aspects of malnutrition. Throughout history, various peoples have known the importance of eating certain foods to prevent symptoms now associated with malnutrition. Yet such knowledge appears to have been repeatedly lost and then re-discovered. For example, the ancient Egyptians reportedly knew the symptoms of scurvy. Much later, in the 14th century, Crusaders sometimes used anti-scurvy measures – for example, ensuring that citrus fruits were planted on Mediterranean islands, for use on sea journeys. However, for several centuries, Europeans appear to have forgotten the importance of these measures. They rediscovered this knowledge in the 18th century, and by the early 19th century, the Royal Navy was issuing frequent rations of lemon juice to every crewman on their ships. This massively reduced scurvy deaths among British sailors, which in turn gave the British a significant advantage in the Napoleonic Wars. Later on in the 19th century, the Royal Navy replaced lemons with limes (unaware at the time that lemons are far more effective at preventing scurvy).
A record in the form of proof of baptisms shall be made, containing the time and hour of birth. An extract from this register may be used to prove the age of majority or minority and will serve as full legal evidence for this purpose. Before this legal requirement, fifteen Parisian parishes already kept baptismal registers, three kept marriage registers, and one kept burial registers. Presided over by Pope Paul III from 1545 to 1563, the Council of Trent also required priests to keep a register of baptisms performed in their parish. The names of godparents had to be included to prevent marriages between people linked by spiritual kinship (e.g., a godfather and his goddaughter could not marry). The council also mandated that marriages, freely contracted before a priest and two or three witnesses, be preceded by the publication of banns and recorded in a designated register. It also advocated for the union of children without requiring parental consent. In May 1579, the Ordinance of Blois extended the obligation to keep marriage and burial registers throughout France. The Ordinance of Saint-Germain-en-Laye of April 1667, known as the "Code Louis," required these registers to be kept in duplicate: the first copy (the minute) remained in the parish, while the duplicate (the grosse) was deposited at the court registry. In Paris, the Châtelet registry preserved the second copy, with the oldest dating back to 1668. By 1790, the capital had around fifty parishes.
Sources: en.wikipedia.org
=== Mercury poisoning === Selenium has a protective effect towards mercury toxicity. Mercury binds to selenium with high affinity, so this metal can inhibit selenium-dependent enzymes. However, increased selenium intake can preserve the enzyme activities, reducing the adverse effects caused by mercury exposure.
In other words, if two people receive the same dose of a given drug based on BSA, the concentration of that drug in the bloodstream of one person may be 10 times higher or lower compared to that of the other person. This variability is typical with many chemotherapy drugs dosed by BSA, and, as shown below, was demonstrated in a study of 14 common chemotherapy drugs.
Research has shown that a mutation of G—>C in the −6 position of the β-globin gene (β+45; human) disrupted the haematological and biosynthetic phenotype function. This was the first mutation found in the Kozak sequence and showed a 30% decrease in translational efficiency. It was found in a family from the Southeast Italy and they suffered from thalassaemia intermedia. Similar observations were made regarding mutations in the position −5 from the start codon, AUG. Cytosine in this position, as opposed to thymine, showed more efficient translation and increased expression of the platelet adhesion receptor, glycoprotein Ibα in humans. Mutations to the Kozak sequence can also have drastic effects upon human health; in particular, certain forms of congenital heart disease are caused by Kozak sequence mutations in the GATA4 gene's 5' untranslated region. The GATA4 gene is responsible for gene expression in a wide variety of tissues including the heart. When the guanosine at the -6 position in the Kozak sequence of GATA4 is mutated to a cytosine, a reduction in GATA4 protein levels results, which leads to a decrease in the expression of genes regulated by the GATA4 transcription factor and linked to the development of atrial septal defect. The ability of the Kozak sequence to optimize translation can result in novel initiation codons in the typically untranslated region of the 5′ (5′ UTR) end of the mRNA transcript. A G to A mutation was described by Bohlen et al.
=== Intrinsic sympathomimetic activity === Also referred to as intrinsic sympathomimetic effect, this term is used particularly with beta blockers that can show both agonism and antagonism at a given beta receptor, depending on the concentration of the agent (beta blocker) and the concentration of the antagonized agent (usually an endogenous compound, such as norepinephrine). See partial agonist for a more general description. Some beta blockers (e.g. oxprenolol, pindolol, penbutolol, labetalol and acebutolol) exhibit intrinsic sympathomimetic activity (ISA). These agents are capable of exerting low-level agonist activity at the β-adrenergic receptor while simultaneously acting as a receptor site antagonist. These agents, therefore, may be useful in individuals exhibiting excessive bradycardia with sustained beta blocker therapy. Agents with ISA should not be used for patients with any kind of angina as it can aggravate or after myocardial infarctions. They may also be less effective than other beta blockers in the management of angina and tachyarrhythmia.
Sources: en.wikipedia.org
It binds to and activates PPAR delta, a nuclear receptor that controls expression of genes related to fatty acid oxidation. This mechanism can alter energy metabolism in animal models. It is not a direct stimulant or fat-burning enzyme.
Early-stage trials examined lipid and glucose markers, but the development program was discontinued. Published human results are limited and do not support approved use for any indication. Claims of performance or health benefits remain unproven.
Yes. Laboratories use LC-MS/MS to detect GW501516 and its metabolites in urine. Detection depends on timing and sensitivity, but the substance is banned at all times.
Rodent studies reported increased endurance and fat oxidation after GW501516 exposure. Long-term studies also found higher rates of some tumors, which led to halted development.