lyophilized powder is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-02-25. Numbers and descriptions here follow the published literature rather than marketing material.
Identity and purity are checked by reversed-phase high-performance liquid chromatography, usually with ultraviolet detection near 214 nanometres, where the peptide bond absorbs. Mass spectrometry confirms the expected mass and reveals whether truncation products or adducts are present. Acid hydrolysis followed by amino acid analysis gives the residue ratio, which should approximate one alanine, one glutamate, one aspartate and one glycine. Counter-ions such as acetate or trifluoroacetate remain in the dried product and lower net peptide content, so a stated purity figure on a label does not by itself describe how much peptide a vial holds.
Regulatory treatment differs by country. No formulation of epitalon holds a marketing authorisation as a medicine in the United States or the European Union, where material sold for laboratory use is handled as a research chemical and is not intended for human consumption. In Russia, several short peptide preparations from the same institute's peptide series are registered medicinal products, and epitalon appears in that national context. Elsewhere it is frequently offered as a cosmetic ingredient, a category with lighter requirements. Advertising claims about longevity or disease prevention are restricted in most jurisdictions, which limits how sellers describe the compound.
Published evidence comes mainly from Russian-language journals and from a single research group, with small sample sizes and limited independent replication. A few laboratories outside that group have examined related peptides and reported weaker or absent telomerase effects, so the central claim is best described as contested rather than settled. Rodent studies report modest changes in some ageing markers and in survival, but designs vary and control conditions are often sparse. No large randomised trial in humans has been published, and long-term safety data in healthy populations are correspondingly thin.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, commonly abbreviated AEDG. It was designed at the St. Petersburg Institute of Bioregulation and Gerontology as a short, chemically defined analogue of epithalamin, a fraction obtained from bovine pineal tissue. Small peptide bioregulators of this type formed a long-running line of work there from the 1980s onward. Because the molecule is produced by solid-phase synthesis rather than extraction, its composition is exact and its purity can be measured directly.
| Property | Value | Notes |
|---|---|---|
| Storage temperature, solid | Approximately -20 C | Sealed, desiccated, protected from light |
| Typical identity method | Electrospray mass spectrometry | Protonated ion expected near 391 |
| Typical purity method | Reversed-phase HPLC | Ultraviolet detection near 214 nm |
| Common synonyms | Epithalon, epithalone, AEDG | Spelling variants appear in supplier catalogues |
| Solution stability | Days at 2-8 C | Hydrolysis and deamidation limit shelf life |
No national medicines regulator has approved epitalon as a therapeutic product. It is generally distributed as a research chemical, and in some jurisdictions selling peptides for human consumption without approval is restricted or prohibited. Certificates of analysis accompanying commercial material vary in which tests are performed, and independent verification of identity and purity is uncommon. Statements about anti-ageing or disease-prevention benefits on vendor pages are marketing claims rather than regulatory findings, a distinction that shapes how the compound is discussed in scientific and popular sources alike.
The most frequently cited laboratory finding is that AEDG increased telomerase activity and extended telomere length in cultured human somatic cells. That work used fetal fibroblast strains and reported changes in enzyme activity alongside altered division counts. Replication by unrelated groups has been limited, and the published record is largely a single-laboratory series rather than a multi-centre programme. The result supports a hypothesis about peptide influence on gene expression in cell culture; it does not by itself establish an effect on telomere length in living animals or in people.
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.
Material supplied for laboratory use is normally a lyophilised white to off-white powder that dissolves readily in water and in isotonic saline. Lyophilised cakes are hygroscopic and should be equilibrated to room temperature before opening to limit condensation on the solid. Solutions are typically prepared at milligram-per-millilitre concentrations and divided into single-use aliquots, because repeated freeze–thaw cycles degrade short peptides. Aqueous solutions are far less stable than the dry powder, and identity is usually verified by mass spectrometry alongside purity estimation from reversed-phase high-performance liquid chromatography.
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.
Regulatory status varies by country and is not harmonized. Epitalon is not an approved drug in major Western jurisdictions. In some countries it is sold as a research chemical, and in others it has appeared in products marketed for other categories. This inconsistent status means that purity, labeling accuracy, and documentation differ widely between suppliers, and verification of identity and purity through independent analysis is the usual way buyers assess a given lot.
Epitalon appears in the literature primarily through a small number of research groups, most of them associated with the St. Petersburg Institute of Bioregulation and Gerontology. Publications describe cell culture experiments, animal studies, and a limited number of small human studies. Independent replication outside this network is sparse. As a result, reviews of the topic usually separate descriptive reports of observed effects from the question of whether those effects generalize, and they note the difficulty of comparing studies that use different preparations and endpoints.
Aggrecanases are extracellular proteolytic enzymes that are members of the ADAMTS (A Disintegrin And Metalloprotease with Thrombospondin Motifs) family. Aggrecanases act on large proteoglycans known as aggrecans, which are components of connective tissues such as cartilage. The inappropriate activity of aggrecanase is a mechanism by which cartilage degradation occurs in diseases such as arthritis. At least two forms of aggrecanase exist in humans: ADAMTS4 or aggrecanase-1 and ADAMTS5 or aggrecanase-2. Both proteins contain thrombospondin (TS) motifs required for proper recognition of substrates. Although both proteins can cleave the substrate aggrecan at the same position, they differ in kinetics and in secondary cleavage sites.
=== Masculinity and social bonds === Comics scholar Jeffrey K. Johnson argues that Wolverine incarnates cultural values of the Reagan era, emphasizing individualism and retributive justice. Similarly, Neil Shyminsky claims that "Wolverine's appeal is grounded in nostalgia for a morally absolute brand of dangerous masculinity." Gerri Mahn, however, draws attention to the theme of vulnerability in Wolverine's stories, particularly the Fatal Attractions story in which Wolverine is gravely injured by Magneto and loses his adamantium bone lacing. Mahn claims that this experience of recuperation from injury presented an opportunity for Wolverine to redefine his gender identity, establishing more caring bonds with others. Christopher Michael Roman connects this moment to the continual theme of Wolverine stories in which he cares for a younger person, usually a young woman. While it might seem that Wolverine is learning to be a surrogate father, Roman claims that the kinship bonds are more complicated than a father-child relationship. In his relationship with Kitty Pryde, Roman argues that Wolverine actually teaches her to redefine herself without relying on a father figure, and that their bond is grounded in shared vulnerability. He also draws attention to Wolverine's role as a mentor to other characters like Colossus, Jubilee, Armor, and Quentin Quire.
Ibutilide is a Class III antiarrhythmic agent that is indicated for acute cardioconversion of atrial fibrillation and atrial flutter of a recent onset to sinus rhythm. It exerts its antiarrhythmic effect by induction of slow inward sodium current, which prolongs action potential and refractory period of myocardial cells. Because of its Class III antiarrhythmic activity, there should not be concomitant administration of Class Ia and Class III agents. Ibutilide is marketed as Corvert by Pfizer. Administration resulted in successful heart rhythm control in 31–44% of patients within 90 minutes, with sustained polymorphic ventricular tachycardia in 0.9–2.5% of patients. It appears to show better results in atrial flutter as compared to atrial fibrillation.
== Portrayal in the media == Woodroof’s life was the basis of the 2013 film Dallas Buyers Club. He was portrayed in the film by Matthew McConaughey, who won an Academy Award for Best Actor for his performance as Woodroof.
=== Anti-inflammatory agent === Some studies show doxycycline as a potential agent to possess anti-inflammatory properties acting by inhibiting proinflammatory cytokines such as interleukin-1 (IL-1), interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), and matrix metalloproteinases (MMPs) while increasing the production of anti-inflammatory cytokines such as interleukin-10 (IL-10). Cytokines are small proteins that are secreted by immune cells and help regulate the immune response. Some studies suggest that doxycycline can suppress the activation of the nuclear factor-kappa B (NF-κB) pathway, which is responsible for upregulating several inflammatory mediators in various cells, including neurons; therefore, it is studied as a potential agent for treating neuroinflammation. A potential explanation of doxycycline's anti-inflammatory properties is its inhibition of matrix metalloproteinases (MMPs), which are a group of proteases known to regulate the turnover of extracellular matrix (ECM) and thus are suggested to be important in the process of several diseases associated with tissue remodeling and inflammation. Doxycycline has been shown to inhibit MMPs, including matrilysin (MMP7), by interacting with the structural zinc atom and/or calcium atoms within the structural metal center of the protein. Doxycycline also inhibits allikrein-related peptidase 5 (KLK5). The inhibition of MMPs and KLK5 enzymes subsequently suppresses the expression of LL-37, a cathelicidin antimicrobial peptide that, when overexpressed, can trigger inflammatory cascades.
Sources: en.wikipedia.org
=== Retesting of samples === According to Article 6.5 in the World Anti-Doping Code samples may be retested later. Samples from high-profile events, such as the Olympic Games, are now retested up to eight years later to take advantage of new techniques for detecting banned substances.
Trump gave a speech, saying "we've never gotten along better" and as a "special treat", Xi and Peng could be the first ones to enter the White House State Ballroom, stating "Anybody who wants to walk into a construction site that's nice and clean and sparkling, it's our honor to have you do so". He said "Tonight, we revive the spirit of that first encounter here on American soil as we are joined by some of the top leaders in business, culture and government from our own time" and added "On one side, China draws on thousands of years of history and tradition from Sun Tzu to Sun Yat-sen. For Americans, we inherit a legacy of faith from Jerusalem to Rome, democracy of ancient Athens, the triumphs of Sparta and the freedom proclaimed in Philadelphia 250 years ago". He celebrated the two nations' "foundation of commerce and mutual respect", adding "President Xi and I both understand that we represent different systems, but the ties between our people endure" and that "Americans and Chinese have always exchanged goods, knowledge, customs, and ideas. This has been the foundation of commerce and mutual respect between our countries, and together we can continue to build a relationship that promotes prosperity and security for future generations". A three‑foot tall sculpture of a bald eagle was unveiled and gifted to Xi, which Trump described as a symbolic "embodiment of the free and soaring spirit of America."
=== Wound healing and immunomodulation === In preliminary research, oat β-glucan is being studied for its potential immunomodulatory effects, antitumour properties, and stimulation of collagen deposition, tissue granulation, reepithelization, and macrophage infiltration in the wound healing process.
=== International rail transport resumption === In January 2022, the first freight trains between North Korea and China resumed after a two-year hold. Uiju Air Base was converted to a cargo decontamination facility for containers brought in by freight trains. A South Korean–based humanitarian organisation, the Inter-Korean Economic Cooperation Research Center (남북경제협력연구소, IKECRC), received a UN sanctions exemption to send 20 thermal imaging cameras to North Phyongan province for detection of fever symptoms, while the WHO was granted 18 more months to deliver shipments for stalled projects. In November 2022, use of the rail Korea–Russia Friendship Bridge resumed.
Freeman was cast at the suggestion of producer Liz Glotzer, despite the novella's character of a white Irishman. Filming proved to be challenging, mainly because of Darabont's need for multiple takes. Freeman said, "The answer [I'd give him] was no ... having to do something again and again for no discernible reason tends to be a bit debilitating to the energy." Nevertheless, his performance was described as "quietly impressive" and "moving" by The New York Times. At the 67th Academy Awards the film received Academy Award nominations for Best Picture and a nomination for Freeman for Best Actor losing to Tom Hanks in Forrest Gump (1994). Since its release, The Shawshank Redemption has remained popular among audiences. In 1994, Freeman served as a member of the jury at the 44th Berlin International Film Festival. Outbreak (1995), a medical thriller directed by Wolfgang Petersen, was Freeman's next film. He played General Billy Ford, a doctor dealing with an outbreak of a fictional virus in a small town. The film stars Dustin Hoffman, Rene Russo, and Donald Sutherland. Outbreak was a box-office success, grossing $189.8 million worldwide, but gained a mixed critics' response. Mick LaSelle of the San Francisco Chronicle credited Freeman for his performance which may have been unappreciated by viewers. In 1995, Freeman starred with Brad Pitt in David Fincher's crime thriller Seven, the story of two detectives who attempt to identify a serial killer who bases his murders on the Christian seven deadly sins.
Sources: en.wikipedia.org
The solid is kept cold, dry and dark, typically at minus twenty degrees Celsius, in a sealed container with desiccant. Dissolved material is kept refrigerated and used promptly. Freezing and thawing a solution repeatedly is avoided because it accelerates degradation.
Reversed-phase chromatography with ultraviolet detection gives a purity percentage, while mass spectrometry confirms identity. Amino acid analysis checks the residue composition. Buyers typically request a certificate of analysis showing these measurements for the specific lot.
It is not authorised as a medicine in the United States or the European Union. Material is sold there as a research chemical or cosmetic ingredient. Some related short peptides are registered drugs in Russia, which is a distinct national situation rather than a general approval.
No. Epithalamin is a peptide-containing extract of bovine pineal glands, while epitalon is a single synthetic tetrapeptide. The extract contains many peptides and other tissue components, so its composition varies between batches in ways that a synthesised sequence does not.