Everything below concerns Lyophilized powder. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-02-15. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Laboratory handling begins with dissolution of the lyophilized powder in water or a suitable aqueous buffer. The dry solid is the more stable form, so stock solutions are generally prepared only when required and kept cold afterwards. Repeated freezing and thawing of a solution is avoided because it encourages aggregation and gradual loss of the intact chain. Diluents and containers are selected to limit adsorption of a short peptide onto plastic surfaces and to reduce microbial growth in aqueous preparations.
Stability depends strongly on pH, temperature and the presence of oxygen and trace metals. Cleavage of the backbone proceeds faster under neutral to alkaline conditions, whereas acidic solutions tend to slow that reaction. The aspartate and glutamate side chains can undergo deamidation or imide formation over time, generating closely related impurities. Published stability data specific to epitalon are sparse, so the usable life of a given solution is best regarded as an open question that depends on buffer composition, concentration and storage temperature.
| 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 |
Interest in epitalon is usually discussed within the broader field of short peptide bioregulators, a category that includes other synthetic di-, tri-, and tetrapeptides studied by the same research group. These compounds share a common rationale: that small fragments of tissue-derived proteins can retain biological activity and can be produced reproducibly. The category as a whole remains outside mainstream pharmacological consensus, and epitalon specifically has a limited presence in independent, non-Russian research literature, which shapes how its evidence base is described.
Epitalon is a synthetic tetrapeptide with the amino acid sequence alanine-glutamate-aspartate-glycine, abbreviated Ala-Glu-Asp-Gly or AEDG. It was developed by the Russian researcher Vladimir Khavinson and colleagues during work on peptide bioregulators derived from the pineal gland. The compound is short enough to be produced by standard solid-phase peptide synthesis and is typically handled as a lyophilized white powder. Its small size distinguishes it from larger pineal peptides such as epithalamin, a complex extract from which the tetrapeptide was conceptually derived.
The four residues give epitalon a molecular formula of C14H22N4O9 and a molecular weight near 390.35 daltons. The presence of two acidic residues, glutamate and aspartate, makes the free peptide strongly acidic, while the alanine and glycine ends provide neutral, nonpolar character. This combination produces a molecule with substantial water solubility. Because there are no cysteine, methionine, or tryptophan residues, the peptide lacks the most common oxidation-sensitive side chains, which simplifies handling compared with many longer peptides.
Animal and clinical reports appear mainly in Russian-language journals from the 1990s and 2000s, covering endpoints such as melatonin rhythm, lifespan in aged rodents, and retinal function. Many of these papers involve small groups, lack blinding or placebo comparison, and are difficult to retrieve through indexed databases. Review articles published in English generally summarise the claims without reanalysing the underlying data. Because no large randomised trial exists, the clinical importance of these reported effects stays unresolved and is properly described as an open question.
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.
Epitalon is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, abbreviated AEDG. Its molecular formula is C14H22N4O9 and its calculated monoisotopic mass is approximately 390.35 daltons. The compound does not occur naturally as a free peptide; it is produced by solid-phase peptide synthesis. Because it contains two acidic residues and no basic residues, the neutral form carries a net negative charge at physiological pH. This charge profile influences how the peptide behaves in solution and during chromatographic analysis.
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.
During his campaign, Duterte gained distinction for his emphatic anti-crime message and push to reduce "Imperial Manila's" dominance. At the same time, he made controversial remarks, including promising to kill tens of thousands of criminals and eradicate crime in six months. He also said his presidency would be "a bloody one", and that he would pardon himself, the police, and soldiers accused of human rights abuses at the end of his six-year term. Duterte also apologized after saying out of anger when recalling the events that he "should have been first" to rape Jacqueline Hamill, an Australian missionary who was gang-raped and killed during the 1989 Davao hostage crisis. After the United States' and Australia's ambassadors to the Philippines criticized him for the rape comments, Duterte threatened to sever diplomatic ties with the countries if elected.
With reports that Palestinians resorted to TikTok for promoting their cause after platforms like Facebook and Twitter blocked their content, Israeli analyst Yoni Ben-Menachem called the app a "tool of dangerous influence" inciting violence against Israelis. According to Ynet, the Palestinian militant group Lion's Den gained much of their popularity through TikTok. In February 2023, Otzma Yehudit politician Almog Cohen advocated blocking TikTok for all of East Jerusalem. US lawmakers wanting to ban TikTok accused the platform of pushing pro-Hamas and pro-Palestine content. According to The Times of Israel, antisemitism at the company was "rampant" after the October 7 attacks, allowing anti-Jewish and anti-Israel content to increase on the platform. Prominent Jewish individuals such as Sacha Baron Cohen, Debra Messing, Amy Schumer, and TikTok creator Miriam Ezagui raised the issue with Adam Presser, TikTok's head of operations, and Seth Melnick, its global head of user operations, both also Jewish. TikTok said that a significant proportion of its userbase comes from non-US regions such as the Middle East and Southeast Asia and that hashtags should not be cherry-picked due to differences in the number of views per post and the age of a post or tag. The popularity of pro-Palestine content has also been explained by the app's younger user base, which has shifted its sympathy away from Israel towards the Palestinians.
=== Category:EC 2.8 (transfer sulfur-containing groups) === EC 2.8.1.1: Thiosulfate sulfurtransferase EC 2.8.1.2: 3-mercaptopyruvate sulfurtransferase EC 2.8.1.3: Thiosulfate—thiol sulfurtransferase EC 2.8.1.4: tRNA uracil 4-sulfurtransferase EC 2.8.1.5: Thiosulfate—dithiol sulfurtransferase EC 2.8.1.6: Biotin synthase EC 2.8.1.7: Cysteine desulfurase EC 2.8.1.8: Lipoyl synthase EC 2.8.1.9: Molybdenum cofactor sulfurtransferase EC 2.8.1.10: Thiazole synthase EC 2.8.1.11: Molybdopterin synthase sulfurtransferase EC 2.8.1.12: Molybdopterin synthase EC 2.8.1.13: tRNA-uridine 2-sulfurtransferase EC 2.8.1.14: tRNA-5-taurinomethyluridine 2-sulfurtransferase EC 2.8.1.15: tRNA-5-methyluridine(54) 2-sulfurtransferase
Sources: en.wikipedia.org
=== 1996–2004: Hiatus, side projects and death of Layne Staley === Although Alice in Chains never officially disbanded, Staley became a recluse, rarely leaving his Seattle condominium following the death of his ex-fiancée Demri Parrott on October 29, 1996. "Drugs worked for me for years," Staley told Rolling Stone in February 1996, "and now they're turning against me ... now I'm walking through hell and this sucks. I didn't want my fans to think that heroin was cool. But then I've had fans come up to me and give me the thumbs up, telling me they're high. That's exactly what I didn't want to happen." Unable to continue with new Alice in Chains material, Cantrell released his first solo album, Boggy Depot, in 1998, also featuring Sean Kinney and Mike Inez. Cantrell and Kinney were also featured on Metallica's 1998 album Garage Inc., both were guest musicians in the track "Tuesday's Gone", a Lynyrd Skynyrd cover. In October 1998, Staley reunited with Alice in Chains to record two new songs, "Get Born Again" and "Died". Originally intended for Cantrell's second solo album, the songs were reworked by Alice in Chains and were released in the fall of 1999 on a box set, Music Bank. The set contains 48 songs, including rarities, demos, and previously released album tracks and singles. The band also released a 15-track compilation titled Nothing Safe: Best of the Box, serving as a sampler for Music Bank, as well as the band's first compilation album; a live album, simply titled Live, released on December 5, 2000; and a second compilation, titled Greatest Hits in 2001.
In Taiwan, researchers were able to produce kefir in a laboratory using microorganisms isolated from kefir grains. They report that the resulting kefir drink had chemical properties similar to homemade kefir.
== Uses == The most common use of the seed is in the form of lotus seed paste (蓮蓉), which is used extensively in Chinese pastries as well as in Japanese desserts. Dried lotus seeds must be soaked in water overnight prior to use. They can then be added directly to soups and congee or used in other dishes. Fresh lotus seeds are sold in the seed heads of the plant and eaten by breaking the individual seeds out of the cone-shaped head and removing the rubbery shell. Crystallized lotus seeds (蓮子糖), made by drying lotus seeds cooked in syrup, are a common Chinese snack, especially during Chinese new year. Xiangtan or Xianglian lotus seeds, along with Yongfeng chili sauce and Changsha stinky tofu are collectively referred to as "Hunan Sanbao" or Hunan's three treasures. Lotus seeds are also common in the northern part of Colombia, especially in cities like Barranquilla and Cartagena. Locals usually refer to lotus seeds as "martillo." Fresh lotus seeds are sold in street markets and are generally eaten raw by the locals.
Sources: en.wikipedia.org
Cyclic ADP-ribose, frequently abbreviated as cADPR, is a cyclic adenine nucleotide (like cAMP) with two phosphate groups present on 5' OH of the adenosine (like ADP), further connected to another ribose at the 5' position, which, in turn, closes the cycle by glycosidic bonding to the nitrogen 1 (N1) of the same adenine base (whose position N9 has the glycosidic bond to the other ribose). The N1-glycosidic bond to adenine is what distinguishes cADPR from ADP-ribose (ADPR), the non-cyclic analog. cADPR is produced from nicotinamide adenine dinucleotide (NAD+) by ADP-ribosyl cyclases (EC 3.2.2.5) as part of a second messenger system.
Performative documentaries stress subjective experience and emotional response to the world. They are strongly personal, unconventional, perhaps poetic and/or experimental, and might include hypothetical enactments of events designed to make us experience what it might be like for us to possess a certain specific perspective on the world that is not our own, e.g. that of black, gay men in Marlon Riggs's Tongues Untied (1989) or Jenny Livingston's Paris Is Burning (1991). This subgenre might also lend itself to certain groups (e.g. women, ethnic minorities, gays and lesbians, etc.) to "speak about themselves". Often, a battery of techniques, many borrowed from fiction or avant-garde films, are used. Performative docs often link up personal accounts or experiences with larger political or historical realities.
By the end of the 1990s, marketing and products began to take on a more retro approach. Former menu items, such as the Burger Family, were reintroduced, and marketing became more targeted toward the baby boomer generation. The Great Root Bear and (in English Canada) the "ba-dum ba-dum" theme were also retired from most advertising (the tuba theme is still used in French-language ads). A new restaurant design was introduced, featuring a bright orange and yellow exterior, reminiscent of the 1950s, while the interior is decorated with memorabilia associated with the same period. Existing restaurants were renovated to match the new style. Meanwhile, with malls in decline, A&W began to focus on opening new standalone restaurants, particularly in smaller markets where McDonald's was often the only major hamburger chain. The last drive-in style restaurant closed in 2000, in Langley, British Columbia.
=== Neurotoxicity === Dextromethorphan was once thought to cause Olney's lesions when administered intravenously; however, this was later proven inconclusive, due to lack of research on humans. Tests were performed on rats, giving them 50 mg or more every day for as long as a month. Neurotoxic changes, including vacuolation, have been observed in posterior cingulate and retrosplenial cortices of rats administered other NMDA receptor antagonists such as PCP, but not with dextromethorphan.
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.
The dry powder is typically held at -20 degrees Celsius or lower, protected from light and moisture. Allowing a sealed vial to reach room temperature before opening reduces condensation on its contents. Conditions stated on a supplier certificate of analysis take precedence over general guidance.