This is a working overview of Prohibited substance, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-03-03 and is reviewed periodically as new material appears.
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.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
Cardarine is a common name for GW501516, a synthetic compound developed in the 1990s through research collaborations involving GlaxoSmithKline. It belongs to a class of molecules known as peroxisome proliferator-activated receptor delta agonists. Early studies explored its effects on lipid metabolism and energy expenditure in animal models. The compound was never approved as a human medicine, and clinical development was discontinued. In the years since, it has appeared in fitness and bodybuilding communities as a performance-enhancing substance. Regulatory agencies classify it as an unapproved drug.
PPARδ is a nuclear receptor that regulates gene expression related to fatty acid oxidation, glucose homeostasis, and mitochondrial function. GW501516 binds to this receptor with high affinity and activates downstream signaling in skeletal muscle and other tissues. Animal studies reported increased endurance and altered fuel preference, but human data remain limited and inconsistent. The precise relationship between receptor activation and observed physiological changes is still an area of active investigation. Researchers have also examined whether the compound affects inflammation or cell proliferation. No approved therapeutic indication exists for cardarine.
| 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. |
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.
GW501516 acts as a ligand for PPAR delta, a nuclear receptor that regulates transcription of genes involved in fatty acid oxidation and energy use. Activation of this receptor in skeletal muscle shifts metabolism toward fat burning in animal models. The compound does not burn fat directly; it changes gene expression over hours to days. Researchers study it to understand metabolic flexibility and exercise adaptation. Effects observed in rodents are not automatically expected in humans.
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.
Tedizolid, sold under the brand name Sivextro (by Merck) is an oxazolidinone-class antibiotic. Tedizolid phosphate is a phosphate ester prodrug of the active compound tedizolid. It was developed by Cubist Pharmaceuticals, following acquisition of Trius Therapeutics (originator: Dong-A Pharmaceuticals), and is marketed for the treatment of acute bacterial skin and skin structure infections (also known as complicated skin and skin-structure infections (cSSSIs)). The most common side effects include nausea (feeling sick), headache, diarrhea and vomiting. These side effects were generally of mild or moderate severity. Tedizolid was approved for medical use in the United States in June 2014, and authorized for medical use in the European Union in March 2015. Tedizolid phosphate is a therapeutic alternative on the World Health Organization's List of Essential Medicines.
Network analysis seeks to understand the relationships within biological networks such as metabolic or protein–protein interaction networks. Although biological networks can be constructed from a single type of molecule or entity (such as genes), network biology often attempts to integrate many different data types, such as proteins, small molecules, gene expression data, and others, which are all connected physically, functionally, or both. Systems biology involves the use of computer simulations of cellular subsystems (such as the networks of metabolites and enzymes that comprise metabolism, signal transduction pathways and gene regulatory networks) to both analyze and visualize the complex connections of these cellular processes. Artificial life or virtual evolution attempts to understand evolutionary processes via the computer simulation of simple (artificial) life forms.
As a French protectorate, Bizerte, Tunisia, was a major French base. Tunisian troops, mostly RTT (Régiment de Tirailleurs Tunisiens), were sent to Indochina. Part of French Indochina, then part of the French Union and later an associated state, Laos fought the communists along with French forces. The role played by Laotian troops in the conflict was depicted by veteran Pierre Schoendoerffer's famous 317th Platoon released in 1964. The French Indochina state of Cambodia also played a role during the Indochina War through the Khmer Royal Army, which had been formed in 1946 in an agreement signed with the French. While Bảo Đại's State of Vietnam (formerly Annam, Tonkin, Cochinchina) had the Vietnamese National Army supporting the French forces, some minorities were trained and organized as regular battalions (mostly infantry tirailleurs) that fought with French forces against the Việt Minh. The Tai Battalion 2 (BT2, 2e Bataillon Thai) is infamous for its desertion during the siege of Dien Bien Phu. Propaganda leaflets written in Tai and French sent by the Việt Minh were found in the deserted positions and trenches. Such deserters were called the Nam Yum rats by Bigeard during the siege, as they hid close to the Nam Yum river during the day and searched at night for supply drops. Another allied minority was the Muong people (Mường). The 1st Muong Battalion (1er Bataillon Muong) was awarded the Croix de guerre des théâtres d'opérations extérieures after the victorious Battle of Vĩnh Yên in 1951.
The three substrates of this enzyme are benzaldehyde, oxidised nicotinamide adenine dinucleotide (NAD+), and water. Its products are benzoic acid, reduced NADH, and a proton. This enzyme belongs to the family of oxidoreductases, specifically those acting on the aldehyde or oxo group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is benzaldehyde:NAD+ oxidoreductase. Other names in common use include benzaldehyde (NAD+) dehydrogenase, and benzaldehyde dehydrogenase (NAD+). This enzyme participates in benzoate degradation via hydroxylation and toluene and xylene degradation.
=== Mechanism of action (eye drops) === It is a nucleoside analogue, a modified form of deoxyuridine, similar enough to be incorporated into viral DNA replication, but the –CF3 group added to the uracil component blocks base pairing, thus interfering with viral DNA replication.
Sources: en.wikipedia.org
== Criticism == NCCIH has been criticized by Steven E. Nissen, Stephen Barrett, and Kimball Atwood, among others, for funding, along with the National Heart, Lung, and Blood Institute, a study of EDTA chelation therapy for coronary artery disease, which lasted about 10 years and cost about $31 million, even though smaller, controlled trials found chelation ineffective. Other NCCIH-funded studies have included the benefits of distant prayer for AIDS, the effects of lemon and lavender essential oils on wound healing, "energy chelation", and "rats stressed out by white noise". In 2006, NCCIH was criticized in Science with the comment "NCCAM funds proposals of dubious merit; its research agenda is shaped more by politics than by science, and its charter structures it in a manner that precludes an independent review of its performance." The authors suggested that, while it was appropriate to study alternative therapies, the quality of its research was lower than other NIH institutes and that these studies could be performed under the auspices of other institutes within the NIH. As an example, the authors described a trial of gemcitabine with the Gonzalez regimen for stage II to IV pancreatic cancer, in the belief that a deficiency of pancreatic proteolytic enzymes causes cancer. Severe adverse effects were associated with the Gonzalez regimen, and no evidence in peer-reviewed journals supported the plausibility or efficacy of the regimen or chelation therapy.
== Modern dating methods == Radiometric dating has been carried out since 1905 when it was invented by Ernest Rutherford as a method by which one might determine the age of the Earth. In the century since then the techniques have been greatly improved and expanded. Dating can now be performed on samples as small as a nanogram using a mass spectrometer. The mass spectrometer was invented in the 1940s and began to be used in radiometric dating in the 1950s. It operates by generating a beam of ionized atoms from the sample under test. The ions then travel through a magnetic field, which diverts them into different sampling sensors, known as "Faraday cups," depending on their mass and level of ionization. On impact in the cups, the ions set up a very weak current that can be measured to determine the rate of impacts and the relative concentrations of different atoms in the beams.
=== "Heil Hitler" sing-along === In January 2026, a video of Peters, Nick Fuentes, Myron Gaines, Andrew Tate, Tristan Tate, Sneako, and Justin Waller singing along to Kanye West's antisemitic 2025 song "Heil Hitler" at the Miami Beach nightclub Vendôme went viral. In response to the related outcry, Peters declared it was "just a song", calling it "funny" that the group had "enough status and influence" to get the song played. The incident was condemned by Miami Beach mayor Steven Meiner. Several local club owners, including David Grutman, announced bans on the group from their venues. Peters met with Grutman and David Einhorn, owner of Papi Steak, telling them he was "not trying to do politics anymore".
=== Pharmacodynamics === Nicotine acts as a receptor agonist at most nicotinic acetylcholine receptors (nAChRs), except at two nicotinic receptor subunits (nAChRα9 and nAChRα10) where it acts as a receptor antagonist. Such antagonism results in mild analgesia. The stereochemistry of nicotine is crucial to its biological effects. Due to the chiral nature of its receptors in the body, the (S)-enantiomer is substantially more active. For this reason, nearly all pharmacological and toxicological data is based on studies of (S)-nicotine. (S)-Nicotine is 4–28 times more potent than (R)-nicotine in standard nicotinic receptor binding and functional assays and elicits stronger nasal irritation, stinging, and mucosal responses at lower detection thresholds—yet smokers rated it as more pleasant in the only human sensory study. The pharmacological, metabolic, and toxicological effects of (R)-nicotine and of racemic (R)/(S)-nicotine mixtures in humans remain poorly understood, with data largely limited to animal studies.
Sources: en.wikipedia.org
Starting with the work of Carl Woese from 1977, genomics studies have placed the last universal common ancestor (LUCA) of all modern life-forms between Bacteria and a clade formed by Archaea and Eukaryota in the phylogenetic tree of life. It lived over 4.2 Gya. A minority of studies have placed the LUCA in Bacteria, proposing that Archaea and Eukaryota are evolutionarily derived from within Eubacteria; Thomas Cavalier-Smith suggested in 2006 that the phenotypically diverse bacterial phylum Chloroflexota contained the LUCA.
Typically, Dupuytren's contracture first presents as a thickening or nodule in the palm, which initially can be with or without pain. Later in the disease process, which can be years later, there is increasing loss of range of motion of the affected finger(s). The earliest sign of a contracture is a triangular "puckering" of the skin of the palm as it passes over the flexor tendon just before the flexor crease of the finger, at the metacarpophalangeal (MCP) joint.
The snails within this family are sophisticated predatory animals. They hunt and immobilize prey using a modified radular tooth along with a venom gland containing neurotoxins; the tooth is launched out of the snail's mouth in a harpoon-like action. Cone snails are carnivorous. Their prey consists of marine worms, small fish, molluscs, and other cone snails. Cone snails are slow-moving, and use their venomous harpoon to disable faster-moving prey. The osphradium in cone snails is more specialized than in other groups of gastropods. It is through this sensory modality that cone snails are able to sense their prey. The cone snails immobilize their prey using a modified, dartlike, barbed radular tooth, made of chitin, along with a venom gland containing neurotoxins. Molecular phylogeny research has shown that preying on fish has evolved at least twice independently in cone snails. Some species appear to have also evolved prey mimicry, where they release chemicals that resemble the sex pheromones certain ragworms release during their short breeding season. The researchers hypothesize that these chemicals cause the prey to be more easily harpooned, but are still uncertain as to exactly how this occurs in the wild.
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 a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.