Everything below concerns Epitalon. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-10-20. Numbers and descriptions here follow the published literature rather than marketing material.
Epitalon is a synthetic four-amino-acid peptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. Its molecular formula is C14H22N4O9, and its calculated molar mass is approximately 390.35 grams per mole. The compound is a short fragment related to a peptide fraction isolated from bovine pineal gland extracts, and it is normally supplied as a lyophilised powder intended for laboratory research. It is not a registered pharmaceutical product in most countries.
The peptide emerged from research carried out in Saint Petersburg from the late 1980s onward, where investigators searched for shorter active fragments of a pineal preparation known as epithalamin. The name epitalon was chosen to reflect that parent extract. Early reports described effects on neuroendocrine markers and on the lifespan of laboratory animals. Much of that work appeared in Russian-language journals, with English translations following later, which affects how readily the original protocols can be assessed by outside groups.
Published studies on epitalon are dominated by a small number of research groups, and independent replication in other laboratories remains limited. Proposed mechanisms include activation of telomerase and modulation of melatonin rhythms, but the evidence for either rests mainly on cell cultures and animal models. Whether the peptide produces comparable effects in humans is an open question, and the absence of large controlled trials means the literature is best read as exploratory rather than settled.
Epitalon is a synthetic tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, commonly abbreviated AEDG. Its design traces to epithalamin, a peptide fraction prepared from bovine pineal gland extracts that researchers in Saint Petersburg began investigating in the 1970s. The compound has a molecular formula of C14H22N4O9 and a nominal molecular mass near 390 daltons. It holds no approved drug status in the United States or the European Union, and material sold under this name is generally offered as a research chemical rather than a finished pharmaceutical product.
Proposed mechanisms centre on cell-culture observations rather than a defined receptor interaction. Several reports describe increased expression of the telomerase catalytic subunit after exposure of cultured human cells, and the authors attributed the effect to short peptide fragments entering the nucleus and influencing gene transcription. No receptor for the tetrapeptide has been identified, and the free peptide is expected to be degraded rapidly by plasma peptidases. Whether any measurable fraction reaches intact tissues after administration remains an unresolved question rather than an established finding.
The published literature is dominated by a small number of research groups, much of it in Russian-language journals, and independent replication outside those groups is limited. Studies are typically small, use cultured cells or rodent models, and report endpoints that differ between papers, which makes comparison difficult. Large randomised human trials have not appeared in the indexed literature. Questions about absorption, distribution and clearance are therefore still treated as open in reviews that mention the compound.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C14H22N4O9 | Derived from the four-residue sequence |
| Molar mass | About 390.35 g/mol | Free peptide, counter-ion not included |
| Appearance | White to off-white powder | Lyophilised solid from aqueous solution |
| Water solubility | Freely soluble | Short, polar peptide chain |
| Common synonyms | AEDG; epithalone | Catalogues use the names interchangeably |
Epitalon is a synthetic linear tetrapeptide with the sequence alanine–glutamate–aspartate–glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and the calculated mass is approximately 390.35 g/mol. The compound is made by solid-phase peptide synthesis rather than extracted from tissue, although early work described it as a short fragment of a peptide fraction obtained from bovine pineal extract. In the research literature the spelling epitalon and the variant epithalone both appear, while AEDG is the standard code used in peptide nomenclature.
Several names circulate for the same molecule, including epitalon, epithalone, epithalamin tetrapeptide, and the sequence code AEDG. A CAS registry number, 307297-39-8, is commonly cited for it, though catalogue entries should be checked against supplier documentation because mislabelled records occur. In its usual form the peptide carries free amino and carboxyl termini and is neither glycosylated nor lipidated. Researchers distinguish the defined tetrapeptide from epithalamin itself, a crude pineal preparation containing many peptides that is not chemically characterised.
Laboratory-grade epitalon is typically supplied as a lyophilized powder. Purity is commonly assessed with reverse-phase high-performance liquid chromatography, often paired with mass spectrometry to confirm molecular identity. Amino acid analysis and peptide mapping can provide additional confirmation of sequence. Certificates of analysis for research materials frequently report purity above 95 percent, although the methods behind such figures vary between suppliers. The absence of a pharmacopeial monograph means that no single standardized assay defines the compound, so reported results depend on the analytical protocol chosen.
Storage recommendations center on limiting moisture, heat, and light. The dry powder is generally kept at minus 20 degrees Celsius, and some suppliers recommend minus 80 degrees for long-term archival. Once dissolved, solutions are usually aliquoted and frozen to avoid repeated freeze-thaw cycles, which can promote aggregation or degradation. Aqueous stability depends on pH and concentration, and buffered saline is often preferred over plain water for biological work. Stability data specific to epitalon remain limited, so general peptide-handling practices are applied by analogy rather than from product-specific validation.
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=== Election to the presidency === On May 30, 2016, the 16th Congress of the Philippines proclaimed Duterte as the president-elect of the Philippines after he topped the official count by the Congress of the Philippines for the 2016 presidential election with 16,601,997 votes, 6.6 million more than his closest rival, Mar Roxas. Camarines Sur representative Leni Robredo on the other hand, was proclaimed as the vice president-elect of the Philippines with 14,418,817 votes, narrowly defeating Senator Bongbong Marcos by 263,473 votes. Duterte's election victory was attributed to growing public dissatisfaction on the perceived failures of administrations that followed the 1986 EDSA Revolution. It was also aided by a strong social media and grassroots fanbase and the endorsement of the influential Iglesia ni Cristo, known for its block-voting.
=== Albania === On 21 December 2024, Albanian Prime Minister Edi Rama announced that the Albanian government will shut down TikTok in 2025 for at least a year, following a deadly incident in November 2024 in which a teenager fatally stabbed another teen after a dispute that began on the platform. On 7 March 2025, the shutdown was officially enacted after the Albanian Cabinet cited concerns over the app's role in promoting violence and bullying among children.
Sources: en.wikipedia.org
Point-of-care ultrasound (POCUS) may be useful in the diagnosis of NF when MRI and CT are unavailable. It can also help rule out diagnoses that mimic earlier stages of NF, including deep vein thrombosis (DVT), superficial abscesses, and venous stasis. Linear probes are generally preferred for the assessment, especially in the extremities. Findings characteristic of NF include abnormal thickening, air, or fluid in the subcutaneous tissue. This can be summarized as the mnemonic "STAFF" (Subcutaneous irregularity or Thickening, Air, and Fascial Fluid). The official diagnosis of NF using ultrasound requires "the presence of BOTH diffuse subcutaneous thickening AND fascial fluid more than 2 mm." Gas in the subcutaneous tissue may show "dirty acoustic shadowing." However, similar to other imaging modalities, the absence of subcutaneous free air does not definitively rule out a diagnosis of NF, because this is a finding that often emerges later in the disease process. Of note, the quality and accuracy of POCUS are highly user-dependent. It may also be difficult to visualize NF over larger areas, or if there are many intervening layers of fat or muscle. It is still unclear whether POCUS improves the speed of diagnosis of NF or if it reduces the time to surgical intervention as a whole.
=== Scope of Computer Validation === The definition of validation above discusses production of evidence that a system will meet its specification. This definition does not refer to a computer application or a computer system but to a process. The main implications in this are that validation should cover all aspects of the process including the application, any hardware that the application uses, any interfaces to other systems, the users, training and documentation as well as the management of the system and the validation itself after the system is put into use. The PIC/S guideline (PIC/S 2004) defines this as a 'computer related system'. Much effort is expended within the industry upon validation activities, and several journals are dedicated to both the process and methodology around validation, and the science behind it.
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Sources: en.wikipedia.org
To what extent suicidal thoughts are influenced by behavioral symptoms is unclear, as they signify a desire to avoid the later stages of the disease. Suicide is the greatest risk of this disease before the diagnosis is made and in the middle stages of development throughout the disease. Other associated risks include choking due to the inability to swallow, physical injury from falls, and malnutrition.
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=== Endogenous inhibitors === MMP activity is regulated at various levels for example by endogenous inhibitors like α2-macroglobulin and the tissue inhibitors of metalloproteinases (TIMPs). α2-macroglobulin regulates a broad spectrum of proteases, while TIMPs are more specific endogenous MMP inhibitors. α2-macroglobulin is an abundant plasma protein that acts in tissue fluids. The plasma glycoprotein consists of four subunits. α2-macroglobulin does not inhibit the activation of MMPs or the MMPs themselves. It entraps proteinases like MMPs and forms a complex with them. The complex is endocytosed and cleared by a low-density lipoprotein-receptor-related protein. In humans, 4 different TIMPs have been found. They are secreted proteins of low-molecular weight. TIMPs bind noncovalently to the active site of MMPs. Changes of TIMP levels are considered to play a role in pathological conditions associated with unbalanced MMP activities. TIMPs consist of 184-194 amino acids. These inhibitors are subdivided into two domains N-terminal and C-terminal. The N-terminal regions of the four TIMPs share a common structure. They all contain twelve cysteine residues that form six disulfide bonds. These bonds are critical for the conformation of the N-terminal and its MMP-inhibitory activities. The C-terminals of the TIMPs differ from each other. The N-terminal subunit is capable of inhibiting MMPs. The TIMP molecule form fits into the active site of an MMP. The TIMP contact the catalytic cleft of the MMP in a similarly as a substrate.
There are three known stable isotopes of oxygen (8O): 16O, 17O, and 18O. Radioisotopes are known from 11O to 28O (particle-bound from mass number 13 to 24), and the most stable are 15O with half-life 122.27 seconds and 14O with half-life 70.62 seconds. All remaining radioisotopes are even shorter in lifetime. The four heaviest known isotopes (up to 28O) decay by neutron emission to 24O, whose half-life is 77 milliseconds; 24O, along with 28Ne, have been used in the model of reactions in the crust of neutron stars. The most common decay mode for isotopes lighter than the stable isotopes is β+ decay to nitrogen, and the most common mode after is β− decay to fluorine.
Sources: en.wikipedia.org
It is a synthetic tetrapeptide built from alanine, glutamate, aspartate and glycine. The four residues are joined by standard peptide bonds, giving a linear chain rather than a branched structure.
The name derives from epithalamin, a pineal gland extract studied in the former Soviet Union. Researchers proposed that short fragments of that extract carried the biological activity of interest.
No major regulatory agency has approved it as a medicine. It is handled as a research chemical, and products sold under this name are not standardised drugs with defined clinical labelling.
No. Epithalamin is a heterogeneous peptide fraction obtained from pineal gland extract and contains many components. Epitalon is a single synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly. Researchers synthesised the shorter peptide while attempting to identify active sequences within the extract.