This is a working overview of aspartimide, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-04-25 and is reviewed periodically as new material appears.
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.
Freeze-dried epitalon is normally kept at minus twenty degrees Celsius in a sealed, desiccated container, protected from light. Short excursions at ambient temperature during shipping are generally tolerated, but repeated warming and cooling cycles encourage moisture uptake, which shortens shelf life. Once dissolved, the peptide is far less stable than the solid: aqueous solutions are subject to hydrolysis and to deamidation at the aspartate and glutamate residues. Working solutions are therefore held refrigerated and used within days, and repeated freezing and thawing of the same vial is best avoided.
Chemically, the molecule consists of four amino acid residues joined by three peptide bonds, with a free N-terminal amino group and a free C-terminal carboxyl group. Its molecular formula is C14H22N4O9, and its monoisotopic mass is approximately 390 daltons. The acidic glutamate and aspartate side chains give the peptide a net negative charge near neutral pH, a property that shapes its chromatographic behaviour and solubility profile. No disulfide bridges or other post-translational modifications are present, so the primary sequence alone defines the structure.
Most experimental work has been carried out in cell culture and animal models. Several reports describe changes in telomerase activity and proliferation in cultured cells, while rodent studies have examined lifespan, melatonin rhythm and reproductive endpoints. Human data remain limited, and much of the published clinical material consists of small trials with incomplete reporting of methods and controls. Whether the cell and animal findings translate into measurable effects in people is an open question, and the mechanistic basis of the reported telomerase changes is not fully established.
Discussions in the literature often conflate three distinct entities: the pineal extract epithalamin, the isolated tetrapeptide AEDG, and commercial preparations sold under similar names. Reviews citing older Russian-language studies sometimes omit detail on purity, route of administration and control groups, which makes cross-study comparison difficult. Researchers working with the compound generally note the need for independent replication, standardized enzyme assays, and clearer reporting of peptide identity. These caveats are relevant when weighing claims that appear in secondary sources rather than in primary reports.
| 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 |
Verification of research-grade material involves comparing a supplier chromatogram against an in-house reference, checking the observed mass against the calculated value, and where possible confirming residue order by tandem mass spectrometry or enzymatic peptide mapping. Purity claims should be read alongside the method used to obtain them, because detection wavelength and integration settings alter the result. Batch-specific data, rather than a generic grade statement, is the informative part of a certificate.
Identity and purity of epitalon samples are normally established by reversed-phase high-performance liquid chromatography with ultraviolet detection near 214 nanometres, combined with mass spectrometry. The mass spectrum confirms the expected molecular ion and can reveal truncated or oxidised by-products. Amino acid analysis after acid hydrolysis verifies that the four residues are present in the expected ratio. Certificates typically report a purity figure taken from chromatographic peak area, expressed as a percentage of total integrated signal.
Lyophilised epitalon is generally held at minus twenty degrees Celsius in a sealed container kept dry and dark. Cooler conditions are sometimes recommended for long-term archives. The solid takes up moisture readily enough that repeated opening of a vial introduces water, so dividing a batch into smaller portions before storage lowers degradation risk. Aqueous solutions are less durable than the dry powder and are usually prepared shortly before use, then kept cold and shielded from light to slow hydrolysis and oxidation.
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.
No pharmacopoeial monograph exists for this peptide, so quality rests on the supplier's internal specifications and on whatever independent testing a purchaser arranges. Certificates of analysis differ widely in which tests they report and in the limits applied. The counter-ion introduced during purification, commonly acetate or trifluoroacetate, changes the net peptide content of a given mass of powder, so two samples of equal weight may not contain equal amounts of the active sequence. Third-party laboratories can verify purity, identity, residual solvents, and counter-ion content for a fee, which makes documentation more informative than labelling.
Verification of a sample usually begins with reversed-phase high-performance liquid chromatography, which resolves the peptide from truncated sequences and other impurities and expresses purity as a percentage of total peak area. Mass spectrometry by electrospray ionisation or matrix-assisted laser desorption supplies an independent check, because the measured mass can be compared against the theoretical value for AEDG. Amino acid analysis or tandem mass spectrometry sequencing can confirm residue order. Each of these methods answers a different question: a purity figure does not establish identity, and an identity match does not establish how much of the material is intact peptide.
Gender incongruence is marked and sustained Patient meets diagnostic criteria for gender incongruence prior to gender-affirming hormone treatment in regions where a diagnosis is necessary to access health care Patient has capacity to consent to hormone therapy treatment Other possible causes of apparent gender incongruence have been identified and excluded Mental health and physical conditions that could negatively impact the outcome of treatment have been assessed Understands the effect of gender-affirming hormone treatment on reproduction and they have explored reproductive options The WPATH standards of care distinguish between gender-affirming hormone therapy, and hormone replacement therapy, with the latter referring to the replacement of endogenous hormones after a gonadectomy to prevent cardiovascular and musculoskeletal issues.
== Release == The film premiered at the 62nd Cannes Film Festival on 18 May 2009, and went on to screen at festivals such as the Toronto International Film Festival and the Maryland Film Festival. It was released in Greece on 11 November 2009 by Feelgood Entertainment. Verve Pictures acquired distribution rights for the United Kingdom and released it on 23 April 2010. Kino International released it in the United States on 25 June 2010.
Bonny Light oil was found at Oloibiri in the Niger delta region of Nigeria in 1956 for its commercial use. Due to its features of generating high profit, it is highly demanded by refiners. Bonny light oil has an API of 32.9, classified as light oil. It is regarded as more valuable than the other oils with lower API as more high-value products are produced in the refinement. However, in Nigeria, problems due to oil spillage caused by vandalism affect both humans and the ecosystem in detrimental ways. Some experiments on animals and soil are done to figure out those impacts on organisms.
=== DNA binding === α-Helices have particular significance in DNA binding motifs, including helix-turn-helix motifs, leucine zipper motifs and zinc finger motifs. This is because of the convenient structural fact that the diameter of an α-helix is about 12 Å (1.2 nm) including an average set of sidechains, about the same as the width of the major groove in B-form DNA, and also because coiled-coil (or leucine zipper) dimers of helices can readily position a pair of interaction surfaces to contact the sort of symmetrical repeat common in double-helical DNA. An example of both aspects is the transcription factor Max (see image at left), which uses a helical coiled coil to dimerize, positioning another pair of helices for interaction in two successive turns of the DNA major groove.
=== Articles === "Ending America's Endless War." Foreign Affairs, June 24, 2019 "Washington's Dangerous New Consensus on China." Foreign Affairs, June 17, 2021 "A Revolution in American Foreign Policy." Foreign Affairs, March 18, 2024 "Democrats must choose: The elites or the working class." The Boston Globe, November 10, 2024 "Bernie Sanders: Kennedy Must Resign." The New York Times, August 30, 2025
Sources: en.wikipedia.org
The Hermetic Brotherhood of Light was a Fraternity that descended from the Fratres Lucis in the late 18th century (in turn, derived from the German Order of the Golden and Rosy Cross), and was the seed from which Ordo Templi Orientis (O.T.O.) ('Order of the Temple of the East' or 'Order of Oriental Templars') was created. Carl Kellner and Paschal Beverly Randolph were members of the Hermetic Brotherhood of Light. In Theodor Reuss' 1917 O.T.O. Constitution, it states in Article 1, Section 1:
=== 1980s and 1990s === In 1983, the company's board of directors hired C. Stephen Lynn as president. In 1984, Lynn hired attorney J. Clifford Hudson to head the legal department. Under Lynn, Sonic and its major franchisees began to encourage the development of local-advertising cooperatives, under the leadership of Keith Sutterfield as advertising manager and later as VP of marketing in which Sutterfield developed a field structure to work with the franchisees. New franchises began to expand the company into new areas and redevelop markets that had been unsuccessful in the past. These developments, combined with a major advertising campaign featuring singer and actor Frankie Avalon, led to significant growth and a new image that made Sonic a nationally recognized name. In 1986, Lynn, with a group of investors, completed a $10-million leveraged buyout and took the company private. The next year, Sonic moved its offices to leased space in downtown Oklahoma City and began to assume a higher profile in the community. In 1991, Sonic became a publicly traded company again. By 1994, the corporation had renegotiated the franchise agreements with its franchisees. During the mid-1990s, Sonic opened 100–150 new stores a year. Beginning in 1998, Sonic began a retrofit program, called "Sonic 2000", to redesign and update all 1,750 stores in its chain to what was called a "retro-future" look.
=== Overview === Substance P ("P" standing for "Preparation" or "Powder") is a neuropeptide – but only nominally so, as it is ubiquitous. Its receptor – the neurokinin type 1 – is distributed over cytoplasmic membranes of many cell types (neurons, glia, endothelia of capillaries and lymphatics, fibroblasts, stem cells, white blood cells) in many tissues and organs. SP amplifies or excites most cellular processes. Substance P is a key first responder to most noxious/extreme stimuli (stressors), i.e., those with a potential to compromise an organism's biological integrity. SP is thus regarded as an immediate defense, stress, repair, survival system. The molecule, which is rapidly inactivated (or at times further activated by peptidases) is rapidly released – repetitively and chronically, as warranted, in the presence of a stressor. Unique among biological processes, SP release (and expression of its NK1 Receptor (through autocrine, paracrine, and endocrine-like processes)) may not naturally subside in diseases marked by chronic inflammation (including cancer).
The United States has had eight Olympic medals stripped for doping violations. In the case of swimmer Rick DeMont, the USOC recognized his gold-medal performance in the 1972 Summer Olympics in 2001, but only the IOC has the power to restore his medal, and it has as of 2017 refused to do so. DeMont originally won the gold medal in 4:00.26. Following the race, the IOC stripped him of his gold medal after his post-race urinalysis tested positive for traces of the banned substance ephedrine contained in his prescription asthma medication, Marax. The positive test following the 400 meter freestyle final also deprived him of a chance at multiple medals, as he was not permitted to swim in any other events at the 1972 Olympics, including the 1,500-meter freestyle for which he was the then-current world record-holder. Before the Olympics, DeMont had properly declared his asthma medications on his medical disclosure forms, but the USOC had not cleared them with the IOC's medical committee. In 2003, Wade Exum, the United States Olympic Committee's director of drug-control administration from 1991 to 2000, gave copies of documents to Sports Illustrated that revealed that some 100 American athletes failed drug tests from 1988 to 2000, arguing that they should have been prevented from competing in the Olympics but were nevertheless cleared to compete; those athletes included Carl Lewis, Joe DeLoach and Floyd Heard.
Xi also gave a speech, saying "As I speak, my compatriots in China are celebrating Mid-Autumn Festival – a cherished occasion for family reunions according to Chinese tradition. I wish you all a very happy Mid-Autumn Festival, and my best wishes to you and your families". He praised Trump and his wife's "meticulous care and consideration" and made them "feel truly at home". He said he and Trump are "making history in our bilateral engagements". He added that "We agreed to build a constructive China-US relationship of strategic stability". He noted that George Washington had an interest in collecting Chinese porcelain. He said "more than 80 years ago, the peoples of China and the U.S. fought side by side against Japanese militarist aggression and pioneered the famous Hump Route". He said "During the war of resistance against Japanese aggression, Chinese soldiers and civilians rescued hundreds of American pilots at the cost of hundreds of thousands of Chinese lives. Such a friendship forged in blood and fire will surely live on through the generations". He said that the friendship was further strengthened by ping-pong diplomacy under President Nixon. He said "Like a river that never stops flowing, history never stands still". He called on the nations to "nurture the beautiful flowers of Sino-US friendship" and that "Together, let us write a new chapter in our friendly relations".
Sources: en.wikipedia.org
Partha Pratim Mitra is an American neuroscientist, computer scientist and entrepreneur. He is the Crick-Clay Professor of Biomathematics at Cold Spring Harbor Laboratory. Mitra holds the H.N. Mahabala Distinguished Chair in Computational Brain Research at IIT Madras and he was a Senior Visiting Researcher at RIKEN, Tokyo, Japan. In 2014, he founded Clarapath, with an aim to automate tissue sectioning in the clinical laboratory.
== Contents == A 1958 source describes Dover's Powder as follows: "Powder of Ipecacuanha and Opium (B.P., Egyp. P., Ind. P.). Pulv. Ipecac. et Opii; Ipecac and Opium Powder (U.S.N.F.); Dover's Powder; Compound Ipecacuanha Powder. Prepared ipecacuanha, 10 g., powdered opium 10 g., lactose 80 g. It contains 1% of anhydrous morphine. Dose: 320 to 640 mg. (5 to 10 grains). Many foreign pharmacies include a similar powder, sometimes with potassium sulphate or with equal parts of potassium nitrate and potassium sulphate in place of lactose; max. single dose 1 to 1.5 g. and max. in 24 hours 4 to 6 g."
Indeed, the AAS mesterolone has been used to improve sperm quality and fertility in men because, apparently unlike other AAS, it shows minimal antigonadotropic effects at typical clinical dosages but activates the AR and thereby supports sperm maturation in the epididymides. However, this use of mesterolone is controversial and its efficacy for such purposes is not fully certain. Although bicalutamide alone would appear to have minimal detrimental effect on testicular spermatogenesis and hence on certain aspects of male fertility, other hormonal agents that bicalutamide may be combined with, including GnRH analogues and particularly estrogens (as in transgender hormone therapy), can have a considerable detrimental effect on fertility. This is largely a consequence of their antigonadotropic activity. Antigonadotropic agents like high-dose CPA, high-dose androgens (e.g., testosterone esters), and GnRH antagonists (though notably not GnRH agonists in the case of fertility) produce hypogonadism and high rates of severe or complete infertility (e.g., severe oligospermia or complete azoospermia) in men. However, these effects are fully and often rapidly reversible with their discontinuation, even after prolonged treatment. In contrast, while estrogens at sufficiently high dosages similarly are able to produce hypogonadism and to abolish or severely impair spermatogenesis, this is not necessarily reversible in the case of estrogens and can be long-lasting after prolonged exposure.
=== Cardiac rhythm monitoring === An electrocardiogram is necessary to rule out abnormal heart rhythms, such as atrial fibrillation, that can predispose patients to clot formation and embolic events. Hospitalized patients should be placed on heart rhythm telemetry, which is a continuous form of monitoring that can detect abnormal heart rhythms. Prolonged heart rhythm monitoring (such as with a Holter monitor or implantable heart monitoring) can be considered to rule out arrhythmias like paroxysmal atrial fibrillation that may lead to clot formation and TIAs, however this should be considered if other causes of TIA have not been found.
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.
It is a synthetic tetrapeptide with the sequence alanine-glutamate-aspartate-glycine, often abbreviated AEDG. The molecule is linear and contains no modified residues, so it is fully described by its sequence.