Everything below concerns Cardarine. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-02-08. Numbers and descriptions here follow the published literature rather than marketing material.
Safety concerns emerged from long-term animal studies. In rodents given the compound for extended periods, researchers found an increased incidence of certain cancers, including liver and bladder tumors. These findings contributed to the discontinuation of clinical development. Whether similar risks apply to short-term or low-level exposure in humans is not established, and controlled human safety data are limited. The relevance of high-dose rodent carcinogenicity findings to human use remains a subject of debate.
Human trials of GW501516 were small and short in duration. They examined lipid levels, glucose handling, and other metabolic markers, but the programs were halted after the animal cancer findings. No approved therapeutic product exists, and published human data are insufficient for establishing long-term safety. Reports of use for athletic performance come mainly from non-clinical settings and cannot be verified through controlled trials. Independent testing of products sold as cardarine has found inconsistent purity and labeling.
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 |
|---|---|---|
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid metabolism |
| Preclinical effect | Increased fatty acid oxidation | Observed in rodent studies |
| Key safety signal | Tumors in rodents after long-term exposure | Contributed to halted clinical development |
| Human trial status | No approved product; development stopped | Limited short-term metabolic data |
| Sport regulatory status | Prohibited at all times | WADA hormone and metabolic modulators class |
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.
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 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.
== History == Lamivudine/zidovudine (brand name Combivir) was introduced to the market with FDA approval in 1997. Its impact in history is significant as it was the first combination therapy with a fixed dose for HIV-positive people, and soon solidified its title as a gold standard as it was the most prescribed NRTI in initial HIV treatment for newly diagnosed patients. The arrival of Combivir was seen as a new revolution in HIV therapy, with its improved toxicity profile and tolerability, especially compared to the undesirable side effects of lone AZT therapy or the unfavorable facial and lipoatrophy seen in Stavudine monotherapy at that time.
8 June Observation of the axial Higgs mode, a Higgs boson-like excitation in a charge density wave material, is reported. It was incorrectly reported in some press releases as a dark matter particle. Scientists provide an overview of the capabilities of missions and observatories for detecting various alien technosignatures. 9 June A study estimates the air pollution impacts on climate change and the ozone layer from rocket launches and re-entry of reusable components and debris in 2019 and from a theoretical future space industry extrapolated from the "billionaire space race". It concludes that substantial effects from routine space tourism should "motivate regulation". Researchers report a robotic finger covered in a type of manufactured living human skin. Researchers demonstrate an electronic skin giving biological skin-like haptic sensations and touch/pain-sensitivity to a robotic hand (1 June). A system of an electronic skin and a human-machine interface is reported that can enable remote sensed tactile perception, and wearable or robotic sensing of many hazardous substances and pathogens (1 June). A multilayer tactile sensor hydrogel-based robot skin is demonstrated (8 June). 10 June – The core of the globular cluster NGC 3201 is shown to harbor a sub-cluster of nearly a hundred black holes. The same study also confirms that the globular cluster NGC 6397 has ejected most of its original black hole population, and its inner mass excess is composed by hundreds of massive white dwarfs.
=== Probability === Step-growth polymerization is a random process, so we can use statistics to calculate the probability of finding a chain with x-structural units ("x-mer") as a function of time or conversion.
=== Pathophysiological models === Clinical professionals continue to debate the causes of spontaneous upper airway blockage. The areas of thought are divided mostly into three medical groups. Some pulmonologists and neurologists believe the risk factors to be:
== Diagnosis == The only reliable way to determine whether a soft-tissue tumor is benign or malignant is through a biopsy. The two methods for acquisition of tumor tissue for cytopathological analysis are:
Sources: en.wikipedia.org
=== Subdisciplines === Chemistry is typically divided into several major sub-disciplines. There are also several main cross-disciplinary and more specialized fields of chemistry. Analytical chemistry is the analysis of material samples to gain an understanding of their chemical composition and structure. Analytical chemistry incorporates standardized experimental methods in chemistry. These methods may be used in all subdisciplines of chemistry, excluding purely theoretical chemistry.
=== Primary === The eRF1 is composed of a polypeptide chain of amino acids in the shape of the letter Y. The protein is composed of 3 major domains: a stem and 2 branches. Each domain has a specific purpose and distinct folding pattern which allows the protein to function properly. While each domain is unique, they all contain the basic structure of an α-β sandwich class, which is essentially a β sheet core surrounded by α helices. Domain 1, sometimes referred to as the N domain, is constructed from a β-sheet core with 4 strands surrounded by 2 α-helices (α2 and α3). The subunits α2 and α3 coil and bind to form a hairpin structure that contains the NIKS motif, YxxCxxxF motif, and the GTS loop. These sites are hypothesized to be the primary appendage in stop codon recognition. Additionally the N-terminus is located in Domain 1, which interacts with Domain 3 in-order to maintain protein stability. Domain 3, sometimes referred to as the C domain, contains the C-terminus of the polypeptide. Additionally, the structure and function of Domain 3, referred to as the M domain, is the least known as optical limitations hinder further research. Domain 2 consists of an α-β sandwich, with one of the outer strands of the sandwich containing no secondary structure. The primary amino acid section allows the GGQ site to form. The folded structure of eRF1 is essentially mimicking the structure of a tRNA molecule. This ensures that the eRF1 machinery fits into the aminoacyl site of the ribosome.
=== Betting scandal === In early February 2023 UFC introduced rules that banned athletes, coaches, and their close family from betting on UFC events. after the call for a sports betting fraud investigation was made on a fight involving Darrick Minner a student of James Krause, who is a UFC coach and avid bettor, and Shayilan Nuerdanbieke at UFC Fight Night: Rodriguez vs. Lemos. The UFC was informed by sources that suspicious betting patterns had been observed on the fight.
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Sources: en.wikipedia.org
Grades determine the command hierarchy from the CMC to the platoon level. Entities command lower-graded entities, and coordinate with like-graded entities. An organization's grade impacts the resources allocated to it. Since 1988, all organizations, billets, and officers in the PLA have a grade. Civil–military relations within the wider state bureaucracy is also influenced by grades. The grading systems used by the armed forces and the government are parallel, making it easier for military entities to identify the civilian entities they should coordinate with. An officer's authority, eligibility for billets, pay, and retirement age is determined by grade. Career progression includes lateral transfers between billets of the same grade, but which are not considered promotions. An officer retiring to the civil service has their grade translated to the civil grade system; their grade continues to progress and draw retirement benefits through the civil system rather than the armed forces. Historically, an officer's grade — or position (Chinese: 职务等级; pinyin: zhiwu dengji) — was more important than their rank (Chinese: 军衔; pinyin: junxian). Historically, time-in-grade and time-in-rank requirements and promotions were not synchronized; multiple ranks were present in each grade with all having the same authority. Rank was mainly a visual aid to roughly determine relative position when interacting with Chinese and foreign personnel. PLA etiquette preferred addressing personnel by position rather than by rank. Reforms to a more rank-centric system began in 2021.
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=== In vivo anti-inflammatory activity === The cyclic peptide NR58-3.14.3 was shown to be a powerful anti-inflammatory agent in vivo, inhibiting inflammation in a number of disease models such as atherosclerosis, ischemia, lung disease, surgical adhesions, endometriosis and pulmonary graft-versus-host disease. It has been suggested that blockage of chemokine function using these molecules should not have a detrimental toxicological effect.
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Sources: en.wikipedia.org
Rodent studies reported increased endurance and fat oxidation after GW501516 exposure. Long-term studies also found higher rates of some tumors, which led to halted development.
Small short-term human trials examined metabolic markers such as lipids and glucose. The trials did not continue after rodent cancer findings, so long-term human safety is unknown.
Controlled human trials have not established a performance benefit. Anecdotal reports exist, but they are not reliable evidence.
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.