A practical reference on PPARδ agonist: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-03-07. Anything still debated is marked as such rather than presented as settled.
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.
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, 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.
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.
| Property | Value | Notes |
|---|---|---|
| CAS Registry Number | 317318-70-0 | Unique identifier for the compound. |
| Chemical class | PPARδ agonist | Synthetic ligand for peroxisome proliferator-activated receptor delta. |
| Appearance | White to off-white solid | Typical form of research-grade material. |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water. |
| Typical storage | -20°C | Recommended for long-term storage of stock solutions. |
Efforts to understand PQQ biosynthesis have contributed to broad interest in radical SAM enzymes and their ability to modify proteins, and an analogous radical SAM enzyme-dependent pathway has since been found that produces the putative electron carrier mycofactocin, using a valine and a tyrosine from the precursor peptide, MftA.
Venezuelan Trotskyist organisations do not regard Chávez as a Trotskyist, with some describing him as a bourgeois nationalist, while others consider him an honest revolutionary leader who made significant mistakes due to him lacking a Marxist analysis. For Italian Marxist Gianni Vattimo and Santiago Zabala in their 2011 book Hermeneutic Communism, "this new weak communism differs substantially from its previous Soviet (and current Chinese) realisation, because the South American countries follow democratic electoral procedures and also manage to decentralise the state bureaucratic system through the Bolivarian missions. In sum, if weakened communism is felt as a spectre in the West, it is not only because of media distortions but also for the alternative it represents through the same democratic procedures that the West constantly professes to cherish but is hesitant to apply." The fidelity of those varied revolutionaries, leaders and parties to the work of Karl Marx is highly contested and has been rejected by many Marxists and other socialists alike. Socialists in general and socialist writers, including Dimitri Volkogonov, acknowledge that the actions of authoritarian socialist leaders have damaged "the enormous appeal of socialism generated by the October Revolution."
== Post-translational modification == Prepro-GAOX (galactose oxidase with signal sequence) is processed twice by proteolytic cleavage in the leader sequence to form the mature GAOX peptide (pro-GAOX). The first cleavage removes a sequence of 24 amino acids by signal peptidase. The second cleavage removes another sequence of 17 amino acids. The covalent linkage between Tyr272 and Cys228 forms after pro-GAOX has been made. The occurrence of this modification does not seem to require any other “helper” proteins. The current mechanism for the formation of this covalent linkage suggests the requirement of copper(I) and dioxygen. The mechanism for this tyrosine-cysteine linkage is not thoroughly understood, but a few key events have been predicted: copper(I) coordinates with Tyr272 and histidines at the (future) active site. Reaction of dioxygen with the active site complex generates a free radical intermediate. Two possible forms of the free radical, thiyl and phenoxyl, are possible; addition of thiyl radical to phenol, or addition of phenoxyl radical to thiol, generates the covalent linkage between the sulfur atom of cysteine and the aromatic ring of tyrosine; A second dioxygen molecule reacts with the copper center coordinated with cross-linked tyrosine-cysteine to generate radical-copper complex.
Sources: en.wikipedia.org
=== Non-occupational silicosis === Chronic simple silicosis has been reported to occur from environmental exposures to silica in regions with high silica soil content and frequent dust storms. Silicosis is seen in horses associated with inhalation of dust from certain cristobalite-containing soils in California.
=== Other === The liver stores a multitude of substances, including vitamin A (1–2 years' supply), vitamin D (1–4 months' supply), vitamin B12 (3–5 years' supply), vitamin K, vitamin E, iron, copper, zinc, cobalt, molybdenum, etc. Haemopoiesis - The formation of blood cells is called haemopoiesis. In the embryonic stage, RBCs and WBCs are formed by liver. In the first trimester fetus, the liver is the main site of red blood cell production. By the 32nd week of gestation, the bone marrow has almost completely taken over that task. The liver helps in the purification of blood. The Kupffer cells of liver are phagocytic cells that help in the phagocytosis of dead blood cells and bacteria from the blood. The liver is responsible for immunological effects – the mononuclear phagocyte system of the liver contains many immunologically active cells, acting as a 'sieve' for antigens carried to it via the portal system. The liver produces albumin, the most abundant protein in blood serum. Albumin is essential in the maintenance of oncotic pressure and acts as a transport for fatty acids and steroid hormones. The liver synthesizes angiotensinogen, a hormone that is responsible for raising the blood pressure when activated by renin, an enzyme that is released when the kidney senses low blood pressure. The liver produces the enzyme catalase to break down hydrogen peroxide, a toxic oxidising agent, into water and oxygen.
octet rule Also Lewis octet rule. A classical rule for describing the electron configuration of atoms in certain molecules: the maximum number of electron pairs that can be accommodated in the valence shell of an element in the first row of the periodic table is four (or eight total electrons). For elements in the second and subsequent rows, there are many exceptions to this rule.
Sources: en.wikipedia.org
== History == Gepirone was developed by Bristol-Myers Squibb in 1986, but was out-licensed to Fabre-Kramer in 1993. The FDA rejected approval for gepirone in 2002 and 2004. It was submitted for the preregistration (NDA) phase again in May 2007 after adding additional information from clinical trials as the FDA required in 2009. However, in 2012 it once again failed to convince the FDA of its qualities for treating anxiety and depression. In December 2015, the FDA once again gave gepirone a negative review for depression due to concerns of efficacy. However, in March 2016, the FDA reversed its decision and gave gepirone ER a positive review. Gepirone ER was finally approved for the treatment of major depressive disorder in the United States in September 2023. A 2026 scientific paper discussed the FDA's decision process and cricitised the approval and subsequent labeling of the drug.
Starting to breastfeed may be challenging for mothers of preterm infants, especially those born before 34 weeks, because their breasts may still be developing (in Lactogenesis I, see Breastfeeding Physiology). Additionally, mother–infant separation and the stressful environment of the NICU are also barriers to breastfeeding. Availability of a lactation specialist in the NICU can be helpful for mothers trying to establish their milk supply. Additionally, skin-to-skin (Kangaroo Care) is safe and beneficial to both mother and baby. Kangaroo Care stabilizes newborn premature infants' vital signs, such as their heart rate, providing a naturally warm environment that helps them regulate their temperature. It is also beneficial to the mother, as it may improve the development of milk supply and be beneficial for mental health.
The term matrix-assisted laser desorption ionization (MALDI) was coined in 1985 by Franz Hillenkamp, Michael Karas and their colleagues. These researchers found that the amino acid alanine could be ionized more easily if it was mixed with the amino acid tryptophan and irradiated with a pulsed 266 nm laser. The tryptophan was absorbing the laser energy and helping to ionize the non-absorbing alanine. Peptides up to the 2843 Da peptide melittin could be ionized when mixed with this kind of "matrix". The breakthrough for large molecule laser desorption ionization came in 1987 when Koichi Tanaka of Shimadzu Corporation and his co-workers used what they called the "ultra fine metal plus liquid matrix method" that combined 30 nm cobalt particles in glycerol with a 337 nm nitrogen laser for ionization. Using this laser and matrix combination, Tanaka was able to ionize biomolecules as large as the 34,472 Da protein carboxypeptidase-A. Tanaka received one-quarter of the 2002 Nobel Prize in Chemistry for demonstrating that, with the proper combination of laser wavelength and matrix, a protein can be ionized. Karas and Hillenkamp were subsequently able to ionize the 67 kDa protein albumin using a nicotinic acid matrix and a 266 nm laser. Further improvements were realized through the use of a 355 nm laser and the cinnamic acid derivatives ferulic acid, caffeic acid and sinapinic acid as the matrix.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.
No. Cardarine is not an anabolic steroid; it belongs to a different chemical class that targets PPARδ. Steroids act primarily through androgen receptors, while cardarine acts through a nuclear receptor involved in metabolism.
Some rodent studies reported increased endurance and changes in fat metabolism after cardarine exposure. Long-term studies in animals also raised concerns about cancer in certain tissues. Human trial data are limited, so these findings cannot be directly translated to people.
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.