This is a working overview of Prohibited substance, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-09-09. Anything still debated is marked as such rather than presented as settled.
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.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
| Property | Value | Notes |
|---|---|---|
| Common name | Cardarine | Common internet and media name. |
| Research code | GW501516 | Also written GW-1516. |
| Drug class | PPARδ agonist | Not a selective androgen receptor modulator. |
| Development status | Discontinued | Clinical development halted after rodent cancer findings. |
| Regulatory status | Prohibited in sport | Listed by WADA; not approved as medicine. |
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.
Anti-doping laboratories identify GW501516 and related metabolites using liquid chromatography coupled with tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be analyzed. The method targets the parent compound and phase I and phase II metabolites, which extend the detection window. Because the substance is prohibited at all times, athletes can be tested outside competition. Detection limits and windows depend on the assay, sample type, 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.
Birds communicate primarily using visual and auditory signals. Signals can be interspecific (between species) and intraspecific (within species). Birds sometimes use plumage to assess and assert social dominance, to display breeding condition in sexually selected species, or to make threatening displays, as in the sunbittern's mimicry of a large predator to ward off hawks and protect young chicks.
The native tribes of East Malaysia have their own languages which are related to, but easily distinguishable from, Malay. Iban is the main tribal language in Sarawak while Dusunic and Kadazan languages are spoken by the natives in Sabah. Chinese Malaysians predominantly speak Chinese dialects from the southern part of China. The more common Chinese varieties in the country are Mandarin, Cantonese, Hokkien, and so on. The Tamil language is used predominantly by the majority of Malaysian Indians. A small number of Malaysians have European ancestry and speak creole languages, such as the Portuguese-based Malaccan Creoles, and the Spanish-based Chavacano language.
=== Feature films === Phang's debut feature film that she directed and wrote was entitled Half-Life (2008) and it starred Sanoe Lake, Julia Nickson-Soul, Leonardo Nam, James Eckhouse, Susan Ruttan and Alexander Agate. The film premiered at the 2008 Sundance Film Festival in the New Frontiers section, and also screened at the Gen Art Film Festival (where it won a Best Feature award), the San Francisco International Asian American Film Festival (where it won a Best Narrative award), the Asian American International Film Festival (where Phang won the "Emerging Director Award"), the Fairy Tales International Gay & Lesbian Film Festival (where it won the Visionary Award), the Tokyo International Film Festival (where it was in-competition and was nominated for the Tokyo Grand Prix), the Mannheim-Heidelberg International Film Festival (where it was also in competition and nominated for the Main Award), and the International Women's Film Festival in Seoul, Korea (where it was opening night film). The film received a limited theatrical release on December 1, 2009. After Half life, Phang's follow-up project was, Look For Water, and Crazy Beats Strong Every Time. Phang received a grant from the Sundance Institute Cinereach Grant, the Sundance Annenberg Feature Film Fellowship, and the Tribeca Film Festival to support these developments. Phang's follow up film that she directed, wrote and edited was Advantageous (2015), which was based on her award-winning short film of the same name. The film starred Jacqueline Kim, Ken Jeong, James Urbaniak, Freya Adams and Samantha Kim.
Sources: en.wikipedia.org
It is expected that improvement of experimental sensitivity will allow discovery of very mild radioactivity of some isotopes now considered stable. For example, in 2003 it was reported that bismuth-209 (the only primordial isotope of bismuth) is very mildly radioactive, with half-life (1.9 ± 0.2) × 1019 yr, confirming earlier theoretical predictions from nuclear physics that bismuth-209 would very slowly alpha decay. Isotopes that are theoretically believed to be unstable but have not been observed to decay are termed observationally stable. Currently there are 105 "stable" isotopes which are theoretically unstable, 40 of which have been observed in detail with no sign of decay, the lightest in any case being 36Ar. Many "stable" nuclides are metastable but have not been observed to decay, and are expected to undergo very rare kinds of radioactive decay, including double beta decay. 146 nuclides from 62 elements with atomic numbers from 1 (hydrogen) to 66 (dysprosium) except 43 (technetium), 61 (promethium), 62 (samarium), and 63 (europium) are theoretically stable to any kind of nuclear decay — except for the theoretical possibility of proton decay, which has never been observed despite extensive searches for it; and spontaneous fission (SF), which is theoretically possible for the nuclides with atomic mass numbers ≥ 93, that is all those with atomic numbers ≥ 41. Besides SF, other theoretical decay routes for heavier elements include:
Genetic factors may be the most significant cause of autism. Early studies of twins had estimated heritability to be over 90%, meaning that genetics explains over 90% of whether a child will develop autism. This may be an overestimation, as later twin studies estimate the heritability at between 60 and 90%. Evidence so far still suggests a strong genetic component, with one of the largest and most recent studies estimating the heritability at 83%. Many of the non-autistic co-twins had learning or social disabilities. For adult siblings, the probability of having one or more features constitutive of the broader autism phenotype may be as high as 30%. In spite of the strong heritability, most cases of autism occur sporadically with no recent evidence of family history. It has been hypothesized that spontaneous de novo mutations in the sperm or egg contribute to the likelihood of developing autism. Additionally, mutations of the Fragile X Messenger Ribonucleoprotein 1 (FMR1) which cause fragile X syndrome, one of the most common causes of intellectual disability and autism, have been linked to the early cessation of reproductive functions of female carriers in the gene. This substantiates the notion that those with autism are more likely to be infertile, weakening the heritability of the disorder. Also, the likelihood of having a child develop autism generally increases with advancing parental age, and mutations in sperm gradually accumulate throughout a man's life.
The Colombia national football team (Spanish: Selección de fútbol de Colombia), nicknamed Los Cafeteros, represents Colombia in men's international association football. It is administered by the Colombian Football Federation (Spanish: Federación Colombiana de Fútbol), the governing body for football in Colombia. The federation has been affiliated with FIFA and CONMEBOL since 1936. Colombia have appeared at seven FIFA World Cups, first qualifying for the 1962 FIFA World Cup. Their best performance came at the 2014 FIFA World Cup, where they reached the quarter-finals for the first time; James Rodríguez won the Golden Boot after scoring six goals. Colombia have also reached the knockout stage at the 1990, 2018 and 2026 tournaments. Colombia won the 2001 Copa América as hosts, winning all six matches without conceding a goal. The team has also finished as runners-up in 1975 and 2024, and third in 1987, 1993, 1995, 2016 and 2021.
Sources: en.wikipedia.org
No. Cardarine is a PPARδ agonist, while selective androgen receptor modulators act on androgen receptors. The two classes differ in receptor target and downstream effects.
Preclinical rodent studies reported cancers, including liver and bladder tumors, at tested doses. The human relevance of those findings is uncertain, but development was discontinued. No approved human product resulted.
No. It remains an investigational compound without approved therapeutic labeling. Sports regulators prohibit its use, and health agencies have warned against consuming it.
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.