Prohibited list comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2026-02-27. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual description for typical solid reference material. |
| Solubility | Poorly soluble in water; soluble in DMSO | Solubility depends on solvent, purity, and form. |
| Storage | Cool, dry, protected from light | Long-term storage often uses low temperature and desiccant. |
| Common analytical method | LC-MS/MS | Used for detection and quantification in biological matrices. |
| Common synonyms | GW-501516; GW501516; endurobol | Naming varies among literature, vendors, and databases. |
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.
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 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.
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.
=== Opioid addiction === In his Deposition: Testimony Concerning a Sickness in the introduction to later editions of Naked Lunch (first published in 1959), William S. Burroughs wrote that apomorphine treatment was the only effective cure to opioid addiction he has encountered:
Although this method has only a limited efficacy, unlike small-molecular chelators (deferasirox, deferiprone, or deferoxamine), such an approach may have only minor side effects in sub-chronic studies. Interestingly, the simultaneous chelation of Fe2+ and Fe3+ increases the treatment efficacy.
Ripeness — riper fruits contain more sugars, increasing GI Cooking methods — the more cooked, or overcooked, a food, the more its cellular structure is broken, with a tendency for it to digest quickly and raise blood glucose more Processing — e.g., flour has a higher GI than the whole grain from which it is ground as grinding breaks the grain's protective layers and with the length of storage. Potatoes are a notable example, ranging from moderate to very high GI even within the same variety. Consumption order — changing the order that foods are eaten was demonstrated to affect blood glucose levels, where eating starches or sugars first resulted in faster increases than when eaten after the rest of the meal More importantly, the glycemic response is different from one person to another, and also in the same person from day to day, depending on blood glucose levels, insulin resistance, and other factors. The glycemic index only indicates the impact on glucose level two hours after eating the food. People with diabetes have elevated levels for four hours or longer after eating certain foods.
The Liberals languished in opposition for a decade while the coalition of Salisbury and Chamberlain held power. The 1890s were marred by infighting between the three principal successors to Gladstone, party leader William Harcourt, former prime minister Lord Rosebery, and Gladstone's personal secretary, John Morley. This intrigue finally led Harcourt and Morley to resign their positions in 1898 as they continued to be at loggerheads with Rosebery over Irish home rule and issues relating to imperialism. Replacing Harcourt as party leader was Sir Henry Campbell-Bannerman. Harcourt's resignation briefly muted the turmoil in the party, but the beginning of the Second Boer War soon nearly broke the party apart, with Rosebery and a circle of supporters including important future Liberal figures H. H. Asquith, Edward Grey and Richard Burdon Haldane forming a clique dubbed the Liberal Imperialists that supported the government in the prosecution of the war. On the other side, more radical members of the party formed a Pro-Boer faction that denounced the conflict and called for an immediate end to hostilities. Quickly rising to prominence among the Pro-Boers was David Lloyd George, a relatively new MP and a master of rhetoric, who took advantage of having a national stage to speak out on a controversial issue to make his name in the party. Harcourt and Morley also sided with this group, though with slightly different aims.
A drinking water sample from a well near the site had levels of contamination 500 times higher than the maximum limits recommended by the World Health Organization. In 2009, the Centre for Science and Environment, a Delhi-based pollution monitoring lab, released test results showing pesticide groundwater contamination up to three kilometres from the factory. Also in 2009, the BBC took a water sample from a frequently used hand pump, located just north of the plant. The sample, tested in UK, was found to contain 1,000 times the World Health Organization's recommended maximum amount of carbon tetrachloride, which causes liver and kidney damage, and is "possibly carcinogenic to humans". In 2010, a British photojournalist ventured into the abandoned UCIL factory to investigate allegations of abandoned, leaking toxins. He was hospitalized in Bhopal for a week after he was exposed to chemicals. Doctors at the Sambhavna Clinic treated him with oxygen, painkillers and anti-inflammatories following a severe respiratory reaction to toxic dust inside the factory. In October 2011, the Institute of Environmental Management and Assessment published an article and video by two British environmental scientists, showing the current state of the plant, landfill and solar evaporation ponds and calling for renewed international efforts to provide the necessary skills to clean up the site and contaminated groundwater. On December 3, 2024, the 40th anniversary of the incident, Madhya Pradesh High Court ruled that the site must be cleaned up in the next month.
Sources: en.wikipedia.org
==== Absorption ==== With oral administration of a single dose, THC is almost completely absorbed by the gastrointestinal tract. However, due to first-pass metabolism in the liver and the high lipid solubility of THC, only about 5 to 20% reaches circulation. Following oral administration, concentrations of THC and its major active metabolite 11-hydroxy-THC (11-OH-THC) peak after 0.5 to 4 hours, with median time to peak of 1.0 to 2.5 hours at different doses. In some cases, peak levels may not occur for as long as 6 hours. Concentrations of THC and 11-hydroxy-THC in the circulation are approximately equal with oral administration. There is a slight increase in dose proportionality in terms of peak and area-under-the-curve levels of THC with increasing oral doses over a range of 2.5 to 10 mg. A high-fat meal delays time to peak concentrations of oral THC by 4 hours on average and increases area-under-the-curve exposure by 2.9-fold, but peak concentrations are not significantly altered. A high-fat meal additionally increases absorption of THC via the lymphatic system and allows it to bypass first-pass metabolism. Consequently, a high-fat meal increases levels of 11-hydroxy-THC by only 25% and most of the increase in bioavailability is due to increased levels of THC. The bioavailability of THC when smoking or inhaling is approximately 25%, with a range of 2% to 56% (although most commonly between 10–35%).
New transgenic production systems are emerging, such as transgenic moss, lemna, fungal or yeast expression systems, transgenic animals and plants such as tobacco plants, which possess the potential to become economically and industrially successful. Legislation and regulation of biotechnology is not well defined yet and leads to differences in interpretation and other uncertainties. In the US, legislation is not yet in place for biosimilars, the generic counterpart of generics in small molecule pharmaceuticals. The inherent risks of the mammalian cell technology led several companies to opt out of mammalian cell technology or to substantially reduce their stake. Examples are Cambrex and Dow Pharma in the US, Avecia, DSM and Siegfried in Europe and WuXi App Tech in China. In conclusion, biocatalysis should be, or become, part of the technology toolbox of any fine chemical company. Mammalian cell culture fermentation, on the other hand, should be considered only by large fine chemical companies with a full war chest and a long-term strategic orientation.
Another author in 2008 raised concern that 2 randomized placebo controlled trials had been conducted, but their results remained unpublished for unknown reasons. None of the studies in the Cochrane review reported long term follow up after 3, 6 or 12 months post procedure. Another problem with some of the trials is that they were too small. The Cochrane review found that most trials reported short term improvement following the procedure, regardless of which material was used. In some studies in the control groups, even placebo (sham) injections and saline injections lead to patients reporting improvement. One trial showed that dextranomer (NASHA Dx) was more effective six months after the procedure compared to placebo for just over half of patients. Another study showed that PTQ has some advantages and was safer than Durasphere in the short term. The authors concluded that due to the small amount of research available and its methodological weaknesses, further conclusions could not be made, especially regarding the long term effectiveness of the procedure. Another review which aimed to focus on the long term impact of the procedure included 889 patients across 23 studies. It reported a pooled improvement rate in measures of incontinence of 39.5%, on average 2 years after the procedure. In some cases there was no improvement after the procedure, and the injections needed to be repeated in up to 34% of cases. There can also be worsening of symptoms after an initial improvement period. A randomized trial by Dehli et al.
== Effects of consumption == The nature of effects will largely depend on the cultivar of the kava plant and the form of its consumption. Traditionally, only noble kava cultivars have been consumed, as they are accepted as safe and produce desired effects. The specific effects of various noble kavas depend on various factors, such as the cultivar used (and the related specific composition of kavalactones), age of the plant, and method of consumption. However, it can be stated that in general, noble kava produces a state of calmness, relaxation, and well-being without diminishing cognitive performance. Kava may produce an initial talkative period, followed by muscle relaxation and eventual sleepiness. The beverage has initial numbing and astringent effect in the mouth caused by the local anesthetic action of kavalactones and chewing it has local anesthetic effects similar to that of cocaine and longer lasting than benzocaine. As noted in one of the earliest Western publications on kava (1886): "A well prepared Kava potion drunk in small quantities produces only pleasant changes in behavior. It is therefore a slightly stimulating drink which helps relieve great fatigue. It relaxes the body after strenuous efforts, clarifies the mind and sharpens the mental faculties". Despite its psychoactive effects, kava is not considered to be physically addictive and its use does not lead to dependency.
Sources: en.wikipedia.org
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.
Most methods use liquid chromatography with tandem mass spectrometry. Urine is common in anti-doping testing, and blood or plasma may be used in research.
Typical guidance is cool, dry, dark storage, often at low temperature and with desiccant. Stability data are limited, so storage conditions should be verified for each batch or supplier.
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.