Preclinical research 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.
Updated 2026-02-19. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular target | PPAR delta (NR1C2) | Ligand-activated nuclear receptor. |
| Primary tissues studied | Skeletal muscle, liver, adipose | Effects on fatty acid oxidation and energy use. |
| Typical detection matrix | Urine | Used in anti-doping analysis. |
| Common analytical method | LC-MS/MS | Detects parent compound and metabolites. |
| Sport regulatory class | Prohibited at all times | Listed as a metabolic modulator by WADA. |
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.
Sporting authorities added GW501516 to prohibited lists after it appeared in athlete samples and online markets. The World Anti-Doping Agency classifies it as a hormone and metabolic modulator, and its use can lead to an anti-doping rule violation. Some early laboratory work suggested effects on fatty acid oxidation and endurance-related metabolism in animals, but those findings do not establish safe or effective use in people. Reports of adverse events in humans are scarce and often anecdotal, which complicates risk assessment.
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
CAS Registry Number (CAS RN) Also simply CAS Number. A unique numerical identifier assigned by the Chemical Abstracts Service (CAS) to every chemical substance described in the open scientific literature, including more than 182 million organic and inorganic compounds, minerals, isotopes, alloys, polymers, and mixtures, as well as so-called "UVCBs" (substances of unknown or variable composition, complex reaction products, or biological origin). CAS numbers are an internationally recognized standard used by scientists, industries, and regulatory bodies.
For services to the community in Runnymede, Surrey. Gillian Pamela Brown. Diary Manager to Permanent Secretaries, Department for Transport. For Public Service. Dr. John Morrison Brown. For services to the community in County Tyrone. Margaret Rose Brown. National Standard Bearer, Royal British Legion Scotland. For voluntary service to Veterans. Susan Yvonne Browne. For services to the Women's Institute and to the community in Sandringham, Norfolk. Alison Stephanie Buchanan. Founder, The British Horse Society Changing Lives Awards and Trustee, #WillDoes Charity. For services to Young People. Robert James Buchanan. Chair, Londonderry Branch, Royal Naval Association. For voluntary services to Veterans. Sarah Bull. Head of Bereavement Services, City Hospice. For services to Palliative Care. William Michael Bulstrode. For services to the community in Framlingham, Suffolk. Valerie Jean Butcher. For services to the community in Kidlington, Oxfordshire. Dr. Fiona Ogilvie Butler. Principal in General Practice, Health Partners at Violet Melchett. For services to the community in West London. Rowland George Butler. For services to the community in Chard, Somerset. Asad Mehmood Butt. Volunteer, Chance to Shine. For services to Young People and to the community in the London Borough of Croydon. Norah Button-Brookwell. Founder and Principal, Liverpool Theatre School. For services to Dance and Theatre. Reverend Albert Thomas Cadmore. For services to the community in Great Yarmouth, Norfolk. Sandra Carol Calderbank. For services to the community in the London Borough of Harrow.
Susan Weintraub is an American scientist. She is a professor at the University of Texas Health Science Center at San Antonio (UTHSCSA). She received a BS in chemistry from the University of Pennsylvania in 1967, MS in chemistry from Trinity University in 1970 and a PhD in biochemistry from UTHSCSA in 1979. She was the president of the American Society for Mass Spectrometry for the period of 2012-2014. In 2017 she was named a Fellow of the American Association for the Advancement of Science (AAAS), and Fellow of the American Society for Mass Spectrometry in 2025. She is an associate editor of the Journal of Proteome Research. Her research focuses on biomedical mass spectrometry where she used mass spectrometry in the early 1970s for quantitative analysis of brain neurochemicals. She has been director of the mass spectrometry core resource at UTHSCSA since 1979.
A pariah field, cast out by the scientific establishment. Between cold fusion and respectable science there is virtually no communication at all. Cold fusion papers are almost never published in refereed scientific journals, with the result that those works don't receive the normal critical scrutiny that science requires. On the other hand, because the Cold-Fusioners see themselves as a community under siege, there is little internal criticism. Experiments and theories tend to be accepted at face value, for fear of providing even more fuel for external critics, if anyone outside the group was bothering to listen. In these circumstances, crackpots flourish, making matters worse for those who believe that there is serious science going on here.
Sources: en.wikipedia.org
=== Normal, prediabetic, and diabetic ranges === The 2010 American Diabetes Association Standards of Medical Care in Diabetes added the HbA1c ≥ 48 mmol/mol (≥6.5 DCCT %) as another criterion for the diagnosis of diabetes.
== Applications == The IM-MS technique can be used for analyzing complex mixtures based on differing mobilities in an electric field. The gas phase ion structure can be studied using IM-MS through measurement of the CCS and comparison with CCS of standard samples or CCS calculated from molecular modelling. The signal-to-noise ratio is obviously improved because the noise can be physically separated with signal in IM-MS. In addition, isomers can be separated if their shapes are different. The peak capacity of IM-MS is much larger than MS so more compounds can be found and analyzed. This character is very critical for -omics study which requires analyzing as many compounds as possible in a single run. It has been used in the detection of chemical warfare agents, detection of explosives, in proteomics for the analysis of proteins, peptides, drug-like molecules and nano particles. Moreover, IM-MS can be used to monitor isomeric reaction intermediates and probe their kinetics. Recently, microscale FAIMS has been integrated with electrospray ionization MS and liquid chromatography MS to rapidly separate ions in milliseconds prior to mass analysis. The use of microscale FAIMS in electrospray ionization MS and liquid chromatography MS can significantly improve peak capacity and signal-to-noise for a range of applications including proteomics, and pharmaceutical analysis. Recently, gas phase ion activation methods have been used to gain new insights into complex structures.
FGL's other holdings include: Flagler Station – Located off the Florida Turnpike and NW 106th Street in Miami, Flagler Station is the state's largest business park, with direct access to the Florida East Coast Railway. The facility has been built in phases. FGL is developing the third and final phase, which will include 1.7 million square feet of new warehouse and distribution space and is scheduled to come online in 2015. When finished, the park will hold more than 10 million square feet of business, commercial, and industrial space. Flagler Station is an approved magnet site for Foreign Trade Zone No. 281. Its tenants include Ryder System, FedEx, Crowley, and Carrier. Titusville Logistics Center – The facility is located on 200 acres that were part of the original Florida East Coast Railway's land holdings. The site features nearly a mile of land directly adjacent to the FECR mainline. The land is permitting for more than 3 million square feet of Class A warehouse and distribution space when the phased build out is complete. To support its growing cargo business, the Canaveral Port Authority recently leased 246,240 square feet of space at the Titusville Logistics Center.
10th Special Forces Group was responsible, among other missions, to operate a stay-behind guerrilla operation after a presumed Soviet overrunning of Western Europe, in conjunction with the program that later became controversially known as Operation Gladio. Through the Lodge-Philbin Act, it acquired a large number of Eastern European immigrants who brought many areas and language skills. Green Light Teams were Special Forces units during the height of the Cold War with the Soviet Union. These Green Light Teams, also referred to as Atomic Demolition Munitions Specialists, were trained to advance, arm, and deploy Special Atomic Demolition Munitions behind enemy lines. As well as preparing for the Warsaw Pact invasion that never came, Vietnam and other areas of South Vietnam, El Salvador, Colombia, Panama and Afghanistan are the major modern conflicts that have defined the Special Forces.
=== Mechanism of action === Thrombin is an enzyme that splits fibrinogen into fibrin monomers in 10 to 60 seconds, which aggregate to form a three-dimensional gel-like structure. Thrombin also activates factor XIII from the human body to factor XIIIa, which then cross-links the fibrin monomers to form a stable clot. Both these processes need calcium to work. As the wound heals, the clot is slowly degraded by the enzyme plasmin.
Sources: en.wikipedia.org
It binds to and activates PPAR delta, a nuclear receptor that controls expression of genes related to fatty acid oxidation. This mechanism can alter energy metabolism in animal models. It is not a direct stimulant or fat-burning enzyme.
Early-stage trials examined lipid and glucose markers, but the development program was discontinued. Published human results are limited and do not support approved use for any indication. Claims of performance or health benefits remain unproven.
Yes. Laboratories use LC-MS/MS to detect GW501516 and its metabolites in urine. Detection depends on timing and sensitivity, but the substance is banned at all times.
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.