The short version of Research chemical fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-06-24. Anything still debated is marked as such rather than presented as settled.
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
GW501516 binds and activates PPARδ, a nuclear receptor that influences transcription of genes involved in fatty acid oxidation and energy use. Activation shifts some metabolic pathways in preclinical models, which is why the compound has been studied for lipid disorders and exercise-related endpoints. The exact downstream effects in humans are incompletely mapped. PPARδ is expressed in many tissues, including skeletal muscle, liver, and adipose tissue, so broad activation may have varied consequences. Researchers continue to examine how selective or partial activation might alter the balance between benefits and risks.
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.
Cardarine is a common name for GW501516, also GW-1516, a synthetic compound developed as a peroxisome proliferator-activated receptor delta (PPARδ) agonist. It belongs to a class of agents that modulate gene transcription related to lipid and energy metabolism. The compound was studied in preclinical and early clinical research for metabolic and cardiovascular conditions, but it did not progress to approved therapeutic use. Its name appears in fitness and sports contexts despite not being approved as a drug.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white solid | Typical form of reference material |
| Solubility | Low in water; soluble in DMSO | Used to prepare stock solutions |
| Typical storage | -20 °C, desiccated, protected from light | Common laboratory practice |
| Analytical method | LC-MS/MS | Detects parent compound and metabolites |
| Common test matrix | Urine or blood | Used in anti-doping analysis |
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.
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 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.
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.
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
=== Human === In early studies, cultured human HL-60 promyelocytes purposely differentiated to granulocytes were used to partially purify and in a series of experiments clone FPR1; an apparent homolog of FPR1, Fpr was also cloned from rabbit neutrophils. The studies indicated that FPR1 is a G protein-coupled receptor that activates cells though a linkage to the pertussis toxin-sensitive Gαi subclass of G proteins, that FPR1 is located on chromosome 19q.13.3, and that this gene consists of two exons, the first of which encodes a 66 base pair 5'-untranslated sequence, the second of which has an intronless open reading frame coding for a protein containing ~354 amino acids; the studies also indicated that cells express multiple formyl peptide receptor mRNA transcripts due to Allelic heterogeneity, alternate Polyadenylation sites, and possibly products of other genes with homology to FPR1. Subsequent studies cloned two other genes with homology to FPR1 viz., FPL2 (originally termed FPR1, FPRH1, or FPRL1) and FPR3 (originally termed FPR2, FPRH2, or FPRL2). FPR2 and FPR3 are composed of 351 and 352 amino acids, respectively, and similar to FPR1 have intronless open reading frames which encode G protein coupled receptors; FPR2 and FPR3 have 66% and 56% amino acid sequence identity with FPR1 and 72% homology to each other.
The breasts reach full maturity only when a woman's first pregnancy occurs. Changes to the breasts are among the first signs of pregnancy. The breasts become larger, the nipple-areola complex becomes larger and darker, the Montgomery's glands enlarge, and veins sometimes become more visible. Breast tenderness during pregnancy is common, especially during the first trimester. By mid-pregnancy, the breast is physiologically capable of lactation and some women can express colostrum, a form of breast milk. Pregnancy causes elevated levels of the hormone prolactin, which has a key role in the production of milk. However, milk production is blocked by the hormones progesterone and estrogen until after delivery, when progesterone and estrogen levels plummet.
=== Nutrition === One hundred grams of milk chocolate supplies 540 calories. It is 59% carbohydrates (52% as sugar and 3% as dietary fiber), 30% fat and 8% protein (table). Approximately 65% of the fat in milk chocolate is saturated, mainly palmitic acid and stearic acid, while the predominant unsaturated fat is oleic acid (table). One hundred grams of milk chocolate is an excellent source (over 19% of the Daily Value, DV) of riboflavin, vitamin B12 and the dietary minerals manganese, phosphorus and zinc. Chocolate is a good source (10–19% DV) of calcium, magnesium and iron.
The first Volunteer unit to be sent out was a 1,300 man composite battalion group, composed of infantry recruited from across London units and a field battery from the Honourable Artillery Company, the City Imperial Volunteers, which was raised in early January 1900; it was sent into combat after six weeks of training in South Africa, where Lord Roberts described it as "quite excellent", and was returned home in October. At the same time, a number of service companies were raised from volunteer units, employed as integral companies of their sister regular battalions, and were well regarded in the field. The decision was taken in late December to form a new force, the Imperial Yeomanry, to consist of mounted infantry. Whilst the Yeomanry provided many of the officers and NCOs, only a small number of the junior ranks came from existing Yeomanry regiments, with some more from Volunteer corps. The units performed well, but recruiting proceeded in fits and starts—recruitment stopped in May, and was only resumed in early 1901—and so an adequate supply of manpower was not always available. Sixty militia battalions, around 46,000 men, also volunteered and were eventually sent to South Africa. They were employed mainly on lines of communication, and regarded as second-line troops of low quality; this was unsurprising, as they were strongly deficient in officers, heavily composed of men of 18 and 19, who were regarded as too young by the Regular Army, with many of their best and most experienced men already deployed with regular units as members of the Militia Reserve.
== Clinical significance == Mutations of the ADH5 gene and ALDH2 gene cause AMED syndrome, an autosomal recessive digenic multisystem disorder characterized by global developmental delay with impaired intellectual development, short stature, growth impairment and early development of myelodysplastic syndrome and bone marrow failure. The syndrome was first described in 2020.
Sources: en.wikipedia.org
=== Viral coat proteins === There are five families of viral coat proteins in which processing occurs at an asparagine residue. These five families are included in three clans: Clan NA (Families N1, N2 and N8), clan NC (Family N7) and clan NE (Family N5). Family N1: The known autolytic cleavage is mediated by the nodavirus endopeptidase, from the C-terminus of the coat protein and only occurs within the assembled virion. Family N2: Includes tetraviruses endopeptidases. The known autolytic cleavage is from the C-terminus of the coat protein. The cleavage occurs during the late stages of virion assembly. Family N8: The known autolytic cleavage is in poliovirus VP0 viral capsid protein into VP2 and Vp4 in the provirion. Family N7: The known autolytic cleavage is from the N-terminus of the coat protein. Family N5: The known autolytic cleavage is from the N-terminus of the coat protein.
Starfish embryos typically hatch as blastulas. Invaginations take place; the first, forming the anus, is created from the blastopore, while a second, taking place in the ectodermic layer, creates the mouth. The archenteron stretches towards the mouth and connects with it, forming the gut. A band of cilia develops on the exterior. This enlarges and extends around the surface and eventually onto two developing arm-like outgrowths. At this stage the larva is known as a bipinnaria. The cilia are used for locomotion and feeding, their rhythmic beat wafting phytoplankton towards the mouth. The next stage in development is a brachiolaria larva, and involves the growth of three short ventral-anterior arms with adhesive tips surrounding a sucker. Both bipinnaria and brachiolaria larvae are bilaterally symmetrical. When fully developed, the brachiolaria settles on the seabed and attaches itself with a short stalk made from its ventral arms and sucker. Metamorphosis now takes place with a radical rearrangement of tissues. The larvae develops an oral surface on the left and an aboral surface on the right. While the gut remains, the mouth and anus move to new positions. Some of the body cavities disappear while others become the water vascular system and the visceral coelom. The starfish is now pentaradially symmetrical. It casts off its stalk and becomes a free-living juvenile starfish up to 1 mm (0.04 in) in diameter.
== Legacy and historical significance == Political scholars have characterised Democratic Left as a transitional organisation in British left-wing politics, representing a shift between traditional communist ideology and the social democratic politics of the 1990s and 2000s. The organisation's focus on moving beyond class-based politics, embracing post-industrial economic realities, and developing new forms of progressive coalition-building reflected themes that later appeared in New Labour's approach. The "New Times" intellectual framework that informed Democratic Left's worldview was part of broader theoretical discussions about political change in the post-Cold War era, with some influence on British politics and international discussions about the future of the left.
=== Mathematics === Simplicial link, a set of simplices "surrounding" a given vertex in a simplicial complex Link (knot theory), a collection of knots entangled with one another Link function in statistics
Sources: en.wikipedia.org
== Parasites == Parasites include Plasmodium berghei (for which it also serves as a vector), and the bioinsecticides/entomopathogenic fungi Metarhizium robertsii and Beauveria bassiana. All three of these parasites combine with insecticides to reduce fitness – see § Insecticides below. CRISPR/Cas9 and U6-gRNA are increasingly (as of 2020) being used together for knockout experiments in mosquitoes. Dong et al., 2018 develops and presents a new U6-gRNA+Cas9 technique in An. gambiae, and utilizes it to knock out fibrinogen related protein 1 (FREP1), thereby severely reducing infection of the mosquito by P. berghei and P. falciparum. However this also demonstrates the centrality of FREP1 to the insect's success, impairing all measured activities across all life stages. Yang et al., 2020 uses the Dong method to do the same with mosGILT, also severely reducing Plasmodium infection of the mosquito but also finding a vital life process is impaired, in mosGILT's case ovary development.
== Responses to lipid environment == When hydrophobic mismatch occurs, WALPs are known to tilt in the bilayer. The extent of this tilt is affected up to a certain point by an entropy contribution that arises from the helix's presence in the bilayer and then by more specific helix-lipid interactions. When charged residues are substituted for the anchoring residues, these charged amino acids prefer a higher position, farther from the interior of the lipid bilayer, in order to maintain their energetically favorable interaction with water. This interaction thus promotes a smaller angle of tilt.
Incidences of partial recoil occurred at 1-week post-procedure, with no further, significant, breast volume decrease afterwards, nor at the follow-up treatment at 30-weeks post-procedure. The stable, long-term increase in breast size was 55 percent (range 15–115%). The MRI visualizations of the breasts showed no edema, and confirmed the proportionate enlargement of the adipose and glandular components of the breast-tissue matrices. Furthermore, a statistically significant decrease in body weight occurred during the study, and self-esteem questionnaire scores improved from the initial-measure scores. Because external vacuum expansion of the recipient-site tissues permits injecting large-volume fat grafts (+300 cc) to correct defects and enhance the bust, the histologic viability of the breast filler (adipocyte fat) and its volume must be monitored and maintained. The long-term, volume maintenance data reported in Breast Augmentation using Pre-expansion and Autologous Fat Transplantation: a Clinical Radiological Study (2010) indicate the technical effectiveness of external tissue expansion of the recipient site for a 25-patient study group, who had 46 breasts augmented with fat grafts. The indications included micromastia (underdevelopment), explantation deformity (empty implant pocket), and congenital defects (tuberous breast deformity, Poland's syndrome).
Docetaxel (DTX or DXL), sold under the brand name Taxotere among others, is a chemotherapy medication used to treat a number of types of cancer. This includes breast cancer, head and neck cancer, stomach cancer, prostate cancer and non-small-cell lung cancer. It may be used by itself or along with other chemotherapy medication. It is given by slow injection into a vein. Common side effects include hair loss, cytopenia (low blood cell counts), numbness, shortness of breath, nausea, vomiting, and muscle pains. Other severe side effects include allergic reactions and future cancers. Docetaxel-induced pneumotoxicity is also a well recognized adverse effect which has to be identified timely and treated after withholding the drug. Side effects are more common in people with liver problems. Use during pregnancy may harm the fetus. Docetaxel is in the taxane family of medications. It works by disrupting the normal function of microtubules and thereby stopping cell division. Docetaxel was patented in 1986 and approved for medical use in 1995. It is on the World Health Organization's List of Essential Medicines. Docetaxel is available as a generic medication.
== External links == Leptin: Your brain, appetite and obesity by the British Society of Neuroendocrinology Leptin by Colorado State University – last updated 1998 Leptin at 3Dchem.com, description and structure diagrams Overview of all the structural information available in the PDB for UniProt: P41159 (Leptin) at the PDBe-KB.
Sources: en.wikipedia.org
Anti-doping and clinical laboratories commonly use liquid chromatography-tandem mass spectrometry. The method can identify GW501516 and its metabolites in urine or blood. Detection depends on sample timing and the amount present.
PPARδ is a nuclear receptor that regulates genes linked to fatty acid oxidation and energy metabolism. Activation can alter lipid handling and energy use in experimental models. The full range of effects in humans is still under study.
The solid compound is generally stable when kept cold, dry, and protected from light. Solutions may degrade faster, so laboratory protocols often specify fresh preparation or cold storage. Stability can depend on solvent, concentration, and container.
Cardarine is commonly known as GW501516 or GW-1516. These names refer to the same synthetic compound. It is not a brand-name approved medicine.