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 2026-05-15. Where a claim depends on a specific study, the study is described rather than over-claimed.
Stability of GW501516 depends on form, temperature, light exposure, and moisture. Solid reference material is typically stored frozen or refrigerated in a desiccator and protected from light. Solutions in organic solvents such as dimethyl sulfoxide are often kept frozen in aliquots to reduce freeze-thaw cycling. Aqueous solubility is low, so aqueous stock solutions can be difficult to prepare without cosolvents. Degradation may appear as changes in chromatographic purity or mass spectral signal. Stability studies are needed to establish shelf life for any specific preparation.
Quality assessment for cardarine samples usually combines identity, purity, and impurity testing. Nuclear magnetic resonance spectroscopy and mass spectrometry can confirm molecular structure, while high-performance liquid chromatography estimates purity. Certificates of analysis from testing laboratories may list these results, but they do not establish safety or legality. In the absence of approved manufacturing, products sold online may contain the wrong compound, variable amounts, or unlisted contaminants. Independent verification is therefore central to analytical work and to interpreting any reported biological activity.
Cardarine is frequently described as a fat-burning or endurance-enhancing supplement, but these claims exceed the available evidence. The compound is not a hormone, steroid, or selective androgen receptor modulator. Research articles discuss it as a tool compound for studying PPARδ biology, while anti-doping literature focuses on its abuse and detection. Quality of unapproved products is uncertain, and independent analyses have found impurities or incorrect labeling. Open questions include whether human cancer risk resembles that seen in rodents and how often non-athletes use the substance.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Common for reference-grade material. |
| Solubility | Low in water | Dissolves in DMSO and some organic solvents. |
| Typical storage | -20 °C, desiccated | Protect from light and moisture. |
| Analytical method | LC-MS/MS | Used for trace detection in biological matrices. |
| Purity assessment | HPLC with UV detection | Often combined with NMR and mass spectrometry. |
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.
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.
There are several diagnostic and classification criteria have been proposed for dermatomyositis. Contemporary approaches generally combine clinical features with myositis-specific and myositis-associated autoantibody testing, supported by complementary laboratory, imaging, histopathologic, and electrophysiologic investigations. Some criteria are designed to establish a broad syndromic diagnosis of DM, whereas others provide greater granularity by identifying distinct autoantibody-defined clinical subsets. Despite these differences, the principal diagnostic features include:
=== Urban soils === The British Geological Survey reported the amount and distribution of PAH compounds including parent and alkylated forms in urban soils at 76 locations in Greater London. The study showed that parent (16 PAH) content ranged from 4 to 67 mg/kg (dry soil weight) and an average PAH concentration of 18 mg/kg (dry soil weight) whereas the total PAH content (33 PAH) ranged from 6 to 88 mg/kg and fluoranthene and pyrene were generally the most abundant PAHs. Benzo[a]pyrene (BaP), the most toxic of the parent PAHs, is widely considered a key marker PAH for environmental assessments; the normal background concentration of BaP in the London urban sites was 6.9 mg/kg (dry soil weight). London soils contained more stable four- to six-ringed PAHs which were indicative of combustion and pyrolytic sources, such as coal and oil burning and traffic-sourced particulates. However, the overall distribution also suggested that the PAHs in London soils had undergone weathering and been modified by a variety of pre-and post-depositional processes such as volatilization and microbial biodegradation.
=== Polymorphisms === A Human Genome Equivalent (HuGE) review in 2004 looked at studies of the connection between genetic mutations affecting leptin regulation and obesity. They reviewed a common polymorphism in the leptin gene (A19G; frequency 0.46), three mutations in the leptin receptor gene (Q223R, K109R, and K656N) and two mutations in the PPARG gene (P12A and C161T). They found no association between any of the polymorphisms and obesity. A 2006 study found a link between the common LEP-2548 G/A genotype and morbid obesity in Taiwanese aborigines, but a 2014 meta-analysis did not, however, this polymorphism has been associated with weight gain in patients taking antipsychotics. The LEP-2548 G/A polymorphism has been linked with an increased risk of prostate cancer, gestational diabetes, and osteoporosis. Other rare polymorphisms have been found, but their association with obesity are not consistent.
==== Tax expenditures ==== The term "tax expenditures" refers to income exclusions, deductions, preferential rates, and credits that reduce revenues for any given level of tax rates in the individual, payroll, and corporate income tax systems. Like conventional spending, they contribute to the federal budget deficit. They also influence choices about working, saving, and investing, and affect the distribution of income. The amount of reduced federal revenues are significant, estimated by CBO at nearly 8% GDP or about $1.5 trillion in 2017, for scale roughly half the revenue collected by the government and nearly three times as large as the budget deficit. Since eliminating a tax expenditure changes economic behavior, the amount of additional revenue that would be generated is somewhat less than the estimated size of the tax expenditure. CBO reported that the following were among the largest individual (non-corporate) tax expenditures in 2013:
=== Mortality === Mortality is increased in people with AS and circulatory disease is the most frequent cause of death. People with AS have an increased risk of 60% for cerebrovascular mortality, and an overall increased risk of 50% for vascular mortality. About one third of those with ankylosing spondylitis have severe disease, which reduces life expectancy. As increased mortality in ankylosing spondylitis is related to disease severity, factors negatively affecting outcomes include:
Sources: en.wikipedia.org
Muhammad, Naseem; Tsai, Peter S.; Lauback, Ronald G. (1982). "High-Pressure Liquid Chromatography Assay for Dane Salt Potassium (-)-N-(1-Methoxycarbonylpropene-2yl)-p-hydroxyphenylglycine". Journal of Liquid Chromatography. 5 (7): 1349–1355. doi:10.1080/01483918208067593. Lauback, Ronald (1984). "Specific High-Performance Liquid Chromatographic Determination of Ampicillin in Bulks, Injectables, Capsules, and Oral Suspensions by Reverse-Phase Ion-Pair Chromatography". Journal of Liquid Chromatography. 7 (6): 1243–1265. doi:10.1080/01483918408074041. Ron Lauback retired in July 2014 from Hanford Pharmaceuticals, based out of Syracuse, New York. He was Vice President of Science from 2007 to 2014.
Hilleman also developed the first Hepatitis B vaccine and the first varicella vaccine, for chickenpox. The company was incorporated in New Jersey in 1970. John J. Horan became CEO and Chairman in 1976, serving until 1985. Under his leadership, the company's investment in R&D grew threefold, and Merck became the largest pharmaceutical company in the world. In 1979, Merck scientists developed lovastatin (Mevacor), the first drug of the statin class. Merck scientist William C. Campbell and Satoshi Ōmura developed ivermectin for veterinary use in 1981, and later put it to human use against onchocerciasis in 1987–1988 with the name Mectizan; today the compound is also used against lymphatic filariasis, scabies and other parasitic infections. In 1982, the company formed a joint venture, KBI Inc., with AstraZeneca. During the late 1980s and 1990s, the company also established joint ventures with DuPont to access research and development expertise, and with Johnson & Johnson to sell over-the-counter consumer medications. In 1985, Merck received approval for imipenem, the first member of the carbapenem class of antibiotics. Antibiotics of the carbapenem class play an important role in treatment guidelines for certain hospital-acquired and multi-drug resistant infections. P. Roy Vagelos became CEO and Chairman that year, succeeding Horan. Vagelos served until reaching the company's mandatory retirement age in 1994, succeeded by Raymond Gilmartin. In 1991, Merck's Kelco subsidiary was responsible for volatile organic compound (VOC) emission pollution in the San Diego area.
There are thousands of proteins in any particular cell. An estimated 1/10 to 1/2 of proteins are phosphorylated in some cellular state. 30–65% of proteins in humans and ~50% of proteins in yeast may be phosphorylated. An estimated 230,000, 156,000, and 40,000 phosphorylation sites exist in human, mouse, and yeast, respectively. Phosphorylation often occurs on multiple distinct sites on a given protein. Since phosphorylation of any site on a given protein can change the function or localization of that protein, understanding the "state" of a cell requires knowing the phosphorylation state of its proteins. For example, generally, if amino acid Serine-473 in the protein AKT is phosphorylated, AKT is functionally active as a kinase, and if it is not phosphorylated, AKT is an inactive kinase. Phosphorylation sites are crucial for proteins and their transportation and functions. They are the covalent modification of proteins through reversible phosphorylation. This enables proteins to stay inbound within a cell since the negative phosphorylated site disallows their permeability through the cellular membrane. Protein dephosphorylation allows the cell to replenish phosphates through release of pyrophosphates which saves ATP use in the cell. An example of phosphorylating enzyme is found in E. coli bacteria. It possesses alkaline phosphatase in its periplasmic region of its membrane. The outermost membrane is permeable to phosphorylated molecules however the inner cytoplasmic membrane is impermeable due to large negative charges. In this way, the E.
=== Equilibrative nucleoside transporters (ENTs) === The nucleoside transporters, or equilibrative nucleoside transporters, are uniporters that transport nucleosides, nucleobases, and therapeutic drugs across the cell membrane. Nucleosides serve as building blocks for nucleic acid synthesis and are key components for energy metabolism in creating ATP/ GTP. They also act as ligands for purinergic receptors such as adenosine and inosine. ENTs allow the transport of nucleosides down their concentration gradient. They also have the ability to deliver nucleoside analogs to intracellular targets for the treatment of tumors and viral infections. ENTs are part of the Major Facilitator Superfamily (MFS) and are suggested to transport nucleosides using a clamp-and-switch model. In this model, the substrate first binds to the transporter, which leads to a conformational change that forms an occluded state (clamp). Then, the transporter switches to face the other side of the membrane and releases the bound substrate (switching). ENTs have been found in protozoa and mammals. In humans, they have been discovered as ENT3 (hENT1-3) and ENT4 (hENT4) transporters. ENTs are expressed across all tissue types, but certain ENT proteins have been found to be more abundant in specific tissues. hENT1 is found mostly in the adrenal glands, ovary, stomach and small intestines. hENT2 is expressed mostly in neurological tissues and small parts of the skin, placenta, urinary bladder, heart muscle and gallbladder.
== Alternative terms == Ultra-high-definition television is also known as Ultra HD, UHD, UHDTV, and 4K. In Japan, 8K UHDTV will be known as Super Hi-Vision since Hi-Vision was the term used in Japan for HDTV. In the consumer electronics market companies had previously only used the term 4K at the 2012 CES but that had changed to "Ultra HD" during CES 2013. "Ultra HD" was selected by the Consumer Electronics Association after extensive consumer research, as the term has also been established with the introduction of "Ultra HD Blu-ray".
Sources: en.wikipedia.org
==== Bipolar disorder ==== Ramelteon has received attention in psychiatry as a possible add-on treatment for mania in bipolar disorder. However, to date, the scarce available evidence fails to support the clinical utility of ramelteon and other melatonin receptor agonists such as melatonin for mania.
Carminic acid (C22H20O13) is a red glucosidal hydroxyanthrapurin that occurs naturally in some scale insects, such as the cochineal, Armenian cochineal, and Polish cochineal. The insects produce the acid as a deterrent to predators. An aluminum salt of carminic acid is the coloring agent in carmine, a pigment. Natives of Peru had been producing cochineal dyes for textiles since at least 700 CE. Synonyms are C.I. 75470 and C.I. Natural Red 4. The chemical structure of carminic acid consists of a core anthraquinone structure linked to a glucose sugar unit. Carminic acid was first synthesized in the laboratory by organic chemists in 1991. In 2018, researchers genetically engineered the microbe Aspergillus nidulans to produce carminic acid. It was previously thought that it contains α-D-glucopyranosyl residue, which was later redetermined to be the β-D-glucopyranosyl anomer.
Lücking and colleagues (2021) emphasize distinguishing real species from minor variants with differing allele frequencies or subtle sequence divergence. These issues reflect the balance between scientific progress and maintaining a practical, stable nomenclature for ecological and conservation work. The LPR framework is one attempt to impose a higher bar: requiring evidence of reproductive isolation or ecological differentiation, not just genetic distinctness, to call something a new species. Additionally, nomenclatural stability is an ongoing issue. When molecular studies reorder relationships, it often necessitates changes in genus or family assignments. The 2016 global lichen classification (and its 2017 update) made hundreds of such changes to align names with phylogeny. They noted that fully half of all lichen genera had to be moved to a different family or order compared to the previous decade's understanding. These scientifically justified changes can be disruptive for end-users like ecologists or land managers who suddenly have to learn new names for familiar organisms. The challenge for systematists is to communicate these changes clearly and perhaps even temper the pace of renaming by holding off until results are strongly corroborated. Some stability measures (like proposing nomenclatural conservation of widely used names even if they are technically nested in another group) can mitigate the impact on the broader community.
All mammalian alkaline phosphatase isoenzymes except placental (PALP and SEAP) are inhibited by homoarginine, and, in similar manner, all except the intestinal and placental ones are blocked by levamisole. Phosphate is another inhibitor which competitively inhibits alkaline phosphatase. Another known example of an alkaline phosphatase inhibitor is [(4-Nitrophenyl)methyl]phosphonic acid. In metal contaminated soil, alkaline phosphatase are inhibited by Cd (Cadmium). In addition, temperature enhances the inhibition of Cd on the enzyme activity, which is shown in the increasing values of Km. In humans, alkaline phosphatase is present in all tissues throughout the body, but is particularly concentrated in the liver, bile duct, kidney, bone, intestinal mucosa and placenta. In the serum, two types of alkaline phosphatase isozymes predominate: skeletal and liver. During childhood the majority of alkaline phosphatase are of skeletal origin. Humans and most other mammals contain the following alkaline phosphatase isozymes:
Selective microfluidics-based ligand enrichment followed by sequencing (SMiLE-seq) is a technique developed for the rapid identification of DNA binding specificities and affinities of full length monomeric and dimeric transcription factors in a fast and semi-high-throughput fashion. SMiLE-seq works by loading in vitro transcribed and translated “bait” transcription factors into a microfluidic device in combination with DNA molecules. Bound transcription factor-DNA complexes are then isolated from the device, which is followed by sequencing and then sequence data analysis to characterize binding motifs. Specialized software is used to determine the DNA binding properties of monomeric or dimeric transcription factors to help predict their in vivo DNA binding activity. SMiLE-seq combines three important functions differing from existing techniques: (1) The use of capillary pumps to optimize the loading of samples, (2) Trapping molecular interactions on the surface of the microfluidic device through immunocapture of target transcription factors, (3) Enabling the selection of DNA that is specifically bound to transcription factors from a pool of random DNA sequences.
Sources: en.wikipedia.org
LC-MS/MS is common, often after sample cleanup. The assay targets GW501516 or its metabolites.
Reference material is usually kept cold, dry, and protected from light. Frozen aliquots reduce repeated freeze-thaw cycles.
No approved pharmaceutical product exists, so manufacturing and quality controls are not standardized. Products may contain different compounds or impurities.
Legal status varies by country. It is not approved as a medicine, and it is prohibited in sport. Some jurisdictions restrict import, sale, or possession.