Epithalon (Epitalon) · Research brief

Epithalon Peptide: Research Overview, Purity Data and Where to Buy

Real Peptides Research TeamEditorial

Updated October 14, 202610 min read

46 WORDS

Short answer

Key takeaways

Epithalon is a synthetic tetrapeptide, Ala-Glu-Asp-Gly, with a molecular weight near 390.4 g/mol and CAS number 307297-39-8, modelled on the pineal extract epithalamin.
AEDG contains no aromatic amino acids, so epithalon cannot be quantified by UV absorbance at 280 nm; detection at 214 nm or amino acid analysis is required instead.
HPLC area-percent purity and net peptide content are different measurements, and a certificate reporting only the first leaves the actual peptide mass in the vial undocumented.
The Asp-Gly bond in epithalon is a classic aspartimide-formation site, which makes pH, temperature history and solution age meaningful storage variables.
The published record on epithalon is preclinical, concentrated in a single research lineage, and contains no large randomised controlled human trials.
A lot-specific certificate of analysis, matched to the number printed on the vial, is the only document that describes the material actually shipped.

Epithalon has been studied in laboratory settings since the 1980s, and the number most often misread about it has nothing to do with aging at all. It's the purity figure printed on the certificate shipped with the vial. A 99 percent HPLC result describes chromatographic purity. It says nothing about how much peptide mass is actually in the container, and for a trifluoroacetate-salt peptide those two figures are rarely the same.

Our team synthesizes research peptides in small batches with exact amino-acid sequencing, and reading lot certificates is daily work here. The difference between a meaningful epithalon certificate and a decorative one comes down to three analytical tests, and most suppliers publish only one. All products are sold for laboratory research use only and are not for human consumption.

What is epithalon?

Epithalon is a synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly (AEDG), molecular formula C14H22N4O9, a molecular weight near 390.4 g/mol, and CAS number 307297-39-8. Modelled on epithalamin, a peptide extract of the pineal gland, epithalon appears in laboratory research on telomerase expression, circadian signalling and cellular senescence. It holds no drug approval.

The oversimplification worth correcting up front is the label 'telomerase activator.' That phrase compresses a narrow set of cell-culture and rodent observations into a settled mechanism the published record doesn't support, and most of the primary work traces back to a single research lineage with limited independent replication. This page covers the chemistry and proposed mechanism, what indexed epithalon studies actually examine, laboratory handling and storage, how per-lot purity gets verified, and the regulatory lines around buying epithalon as a research material.

The molecule behind the name: structure, class and proposed mechanism

Epithalon is a four-residue peptide built from alanine, glutamic acid, aspartic acid and glycine, which places it in the group researchers call short peptide bioregulators. It was developed as a synthetic counterpart to epithalamin, a polypeptide complex originally isolated from bovine pineal tissue, at the St. Petersburg Institute of Bioregulation and Gerontology.

The mechanism described across that literature is gene-regulatory rather than receptor-mediated. Short, acidic peptides are hypothesised to enter the nucleus and interact with specific promoter regions, including the promoter of TERT (telomerase reverse transcriptase), the catalytic subunit of the enzyme that extends telomeric repeats at chromosome ends. Research suggests this interaction may influence transcription in cultured cells. It has not produced a validated receptor target, and no high-resolution structural dataset pins epithalon to a defined binding site.

One structural quirk changes how epithalon must be analysed in a lab, and almost nobody mentions it. AEDG contains no aromatic residues: no tryptophan, no tyrosine, no phenylalanine. UV absorbance at 280 nm, the default quantification wavelength for most proteins and many longer peptides, sees essentially nothing here. Any lab quantifying epithalon by A280 is reading noise, not concentration. Purity and concentration work has to run at 214 nm, where the peptide bond itself absorbs, or through amino acid analysis. A supplier publishing a chromatogram recorded at 280 nm is showing a document that physically cannot describe epithalon.

What the published literature actually examines

The indexed literature clusters into four areas, and all of it is preclinical or small in scale. First, telomerase activity and telomere length in cultured human somatic cells, searchable on PubMed under both the epithalon and epitalon spellings. Second, pineal function and melatonin rhythm work in aged rodents and non-human primates, indexed here. Third, lifespan and spontaneous tumour incidence in mouse strains, indexed here. Fourth, retinal degeneration models, which appear under the AEDG designation here.

Two honest caveats belong with every one of those citations. Much of this body of work originates from one research group and appears in a narrow set of journals, with limited replication outside that lineage. And the indexed record contains no large randomised controlled trials of epithalon in humans. Research suggests directions worth investigating. It does not establish outcomes.

Anyone citing epithalon results should read the primary papers rather than secondary summaries, because the distance between what a rodent lifespan study measured and what a supplement blog claims it proved is usually enormous. In our experience fielding questions from research buyers, nearly every claim about epithalon that can't be traced to a PubMed-indexed paper traces instead to a forum post that cited another forum post.

Laboratory handling and storage basics

Lyophilised epithalon is stored frozen, kept dry, and protected from light. Standard practice for research-grade peptide powders is storage at minus 20 degrees Celsius or colder in a desiccated container, with reconstituted material refrigerated between 2 and 8 degrees Celsius, aliquoted to avoid repeated freeze-thaw cycles, and logged with a preparation date. Lyophilised powder tolerates short ambient excursions during transit far better than solution does, which is why reputable suppliers ship powder rather than premixed vials.

The sequence itself flags a specific degradation pathway. Asp-Gly is the best-characterised aspartimide-forming motif in peptide chemistry: at elevated pH or temperature, the aspartate side chain cyclises with the adjacent glycine nitrogen to form a succinimide intermediate, which then opens to isoaspartate. The rearranged molecule carries the same nominal mass as the original, so mass spectrometry alone will not catch it. A retention-time shift on reverse-phase HPLC will. Epithalon carries that motif at positions three and four, which is why buffer pH, temperature history and solution age matter more for epithalon than for many longer sequences.

Document storage conditions per lot. Freezer temperature logs, aliquot dates and solvent details are what make a result reproducible six months later, and they're the first records missing whenever an experiment using epithalon can't be repeated.

How purity is verified, and what a certificate actually tells you

Three tests, not one. Reverse-phase HPLC at 214 nm returns area-percent purity. Mass spectrometry, either ESI-MS or MALDI-TOF, confirms identity by molecular weight, with epithalon showing a protonated molecular ion near m/z 391.4 against its 390.4 g/mol neutral mass. Net peptide content, determined by amino acid analysis or nitrogen determination, tells you what fraction of the vial's mass is peptide rather than counterion and bound water.

So what does a purity figure actually prove on its own? Less than buyers assume. Synthetic peptides purified by RP-HPLC are typically isolated as trifluoroacetate salts and retain residual water, so a lot that is 99 percent pure by chromatography can still be meaningfully less than 99 percent peptide by mass. Purity and content answer different questions, and a certificate reporting only area percent leaves the mass question entirely open.

The second distinction is per-lot versus per-product. A certificate tied to the lot number printed on the vial, with a test date, a stated instrument method and an actual chromatogram, documents the material in hand. A single certificate reused across every batch documents nothing at all. We publish lot-specific certificates of analysis in our COA library, and the same test applies to any epithalon supplier worth buying from: ask for the lot number on the vial, then see whether the paperwork matches it.

Where the regulatory lines sit, and how research material is ordered

Epithalon holds no FDA approval for any indication, and it is not a recognised dietary ingredient. It is supplied as a research chemical, labelled for laboratory use, and sold to researchers and institutions for in vitro and preclinical work. All products are sold for laboratory research use only and are not for human consumption.

Nothing here is health guidance. Anyone weighing a decision about their own health should speak with a licensed physician, and anyone weighing one involving an animal should talk to their veterinarian rather than treating preclinical peptide literature as instruction.

For sourcing, the practical checklist is short: published sequence and CAS number, lot-specific analytics covering purity and identity, a stated shipping form, and documented cold handling. Our epithalon product page lists the specifications we publish for the compound, and the wider research catalogue is held to the same small-batch synthesis and per-lot testing standard. Short sequences like epithalon are inexpensive to synthesise at mediocre quality and genuinely difficult to evaluate without instrumentation, which is exactly why documentation should outrank marketing copy in any purchase decision.

Epithalon Sourcing: Supplier Documentation Comparison

Sourcing a four-residue research peptide hinges on documentation, not description. This table maps what weak and verifiable epithalon sourcing look like against four evaluation criteria.

Evaluation criterion	Weak sourcing signal	Verifiable sourcing signal	Bottom line
Certificate scope	One generic certificate reused across every batch, with no lot number or test date	A certificate tied to the lot number printed on the vial, with test date, method and chromatogram	Only lot-specific paperwork describes the material you actually received; the rest is collateral
Analytical methods	An HPLC purity percentage alone, often with no detection wavelength stated	RP-HPLC at 214 nm, mass spectrometry confirming the 390.4 g/mol neutral mass, plus net peptide content	Purity, identity and content are three separate questions requiring three separate tests
Storage and shipping	Premixed solution, unstated shipping form, no temperature handling information	Lyophilised powder, stated cold handling, documented appearance specification on the certificate	Powder survives transit excursions that solution does not, so shipping form is a quality variable
Sequence verification	Product name only, with no sequence, formula or CAS number published anywhere	Ala-Glu-Asp-Gly stated explicitly alongside CAS 307297-39-8 and formula C14H22N4O9	A supplier unwilling to publish the sequence is asking for trust it has not documented

What If: Epithalon Laboratory Scenarios

What if epithalon arrives warm after several days in transit?

Record the condition on receipt, then check whether the material shipped as lyophilised powder or as a solution. Lyophilised epithalon is comparatively robust to short ambient excursions, which is precisely why powder is the standard shipping form and premixed solution is not. Move the vial into frozen storage, note the excursion in the lot log, and compare appearance against the certificate specification before any work proceeds. If the supplier can't tell you the shipping form or the transit duration, the problem is sourcing, not storage.

What if the certificate shows 99 percent purity but no mass spectrum?

Request the mass spectrometry data before accepting the lot. HPLC area percent tells you how much of the injected material eluted as a single peak. It does not confirm that the peak is Ala-Glu-Asp-Gly. A truncated, deletion or scrambled sequence can chromatograph beautifully and still be the wrong molecule. Identity confirmation requires ESI-MS or MALDI-TOF matching the expected 390.4 g/mol neutral mass. A supplier holding the chromatogram but not the spectrum has done half the analytical work and published all of it.

What if reconstituted epithalon looks cloudy or shows particulates?

Stop using that solution and document what you observed. AEDG is a small, acidic, highly water-soluble peptide, so visible haze or particulate matter in correctly prepared solution points toward contamination, an unsuitable solvent, or degradation rather than normal behaviour. Cloudiness appearing after storage can also follow repeated freeze-thaw cycling, which is the argument for aliquoting at the outset. Check the lot certificate's appearance specification, review the solvent and storage log, then contact the supplier with the lot number in hand.

The Blunt Truth About Longevity Peptide Marketing

Here's the honest answer: the consumer-facing story about epithalon and life extension runs far ahead of the evidence supporting it. The strongest published signals are cell-culture telomerase observations and rodent lifespan data from a narrow research lineage. That's a legitimate reason to keep studying the molecule. It is not a reason to believe the marketing. Research suggests directions; it does not deliver outcomes. Any supplier selling epithalon with confident claims about human longevity is selling something the literature has not earned, and the defensible position is to publish the analytics and let researchers draw their own conclusions.

Specifications and analytics for the compound sit on the epithalon product listing, lot-specific paperwork is published in our certificate of analysis library, the synthesis and purity standard behind every batch is detailed on pure peptides, and the broader research catalogue follows the same per-lot testing rule.

Epithalon is an unusually small molecule carrying an unusually large amount of narrative, and the two have remarkably little to do with each other. Four amino acids, no aromatic residues, an aspartimide-prone Asp-Gly bond, and a preclinical literature that stays interesting precisely because it's unfinished. Judge a supplier on whether its paperwork survives contact with an instrument, not on how confidently its copy talks about aging. All products are sold for laboratory research use only and are not for human consumption.

References

Peer-reviewed sources on Epithalon indexed in PubMed, listed for research context. Real Peptides supplies Epithalon for laboratory research use only.

Overview of Epitalon-Highly Bioactive Pineal Tetrapeptide with Promising Properties. International journal of molecular sciences, 2025. PMID 40141333. doi:10.3390/ijms26062691
Epitalon increases telomere length in human cell lines through telomerase upregulation or ALT activity. Biogerontology, 2025. PMID 40908429. doi:10.1007/s10522-025-10315-x
The Antioxidant Tetrapeptide Epitalon Enhances Delayed Wound Healing in an in Vitro Model of Diabetic Retinopathy. Stem cell reviews and reports, 2025. PMID 40493162. doi:10.1007/s12015-025-10911-x
Epitalon protects against post-ovulatory aging-related damage of mouse oocytes in vitro. Aging, 2022. PMID 35413689. doi:10.18632/aging.204007
AEDG Peptide (Epitalon) Stimulates Gene Expression and Protein Synthesis during Neurogenesis: Possible Epigenetic Mechanism. Molecules (Basel, Switzerland), 2020. PMID 32019204. doi:10.3390/molecules25030609
Effect of peptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the morphology of the thymus in hypophysectomized young and old birds. Bulletin of experimental biology and medicine, 2013. PMID 23658898. doi:10.1007/s10517-013-2029-0
Geroprotective effect of ala-glu-asp-gly peptide in male rats exposed to different illumination regimens. Bulletin of experimental biology and medicine, 2008. PMID 19110597. doi:10.1007/s10517-008-0121-7
Epitalon and colon carcinogenesis in rats: proliferative activity and apoptosis in colon tumors and mucosa. International journal of molecular medicine, 2003. PMID 12964022

Questions

Epithalon is a synthetic tetrapeptide with the amino-acid sequence Ala-Glu-Asp-Gly (AEDG), molecular formula C14H22N4O9, a molecular weight near 390.4 g/mol and CAS number 307297-39-8. It was designed as a synthetic counterpart to epithalamin, a peptide extract of the pineal gland. It is supplied as a research chemical for laboratory use and holds no drug approval.

The indexed literature is preclinical and clusters into telomerase activity in cultured human cells, melatonin and pineal rhythm work in aged rodents and primates, lifespan and spontaneous tumour incidence in mouse strains, and retinal degeneration models. Much of it originates from one research lineage, and the record contains no large randomised controlled human trials. The full index is searchable on PubMed under both the epithalon and epitalon spellings.

Lyophilised peptide powder is stored frozen, desiccated and protected from light, typically at minus 20 degrees Celsius or colder for long-term holding. Once reconstituted, solution is refrigerated between 2 and 8 degrees Celsius and aliquoted so repeated freeze-thaw cycling is avoided. Because the Asp-Gly bond is aspartimide-prone, elevated pH and temperature exposure are worth logging alongside preparation dates.

Research-grade peptides are supplied to researchers, laboratories and institutions for in vitro and preclinical work, and are labelled for laboratory research use only. They are not sold for human or veterinary consumption, and nothing about their supply constitutes health guidance. Anyone with a health question should raise it with a licensed physician, or with a veterinarian where an animal is involved.

At minimum: the published sequence and CAS number, a lot-specific certificate of analysis matching the number printed on the vial, an HPLC purity result with the detection wavelength stated, and mass spectrometry confirming identity. Net peptide content is the fourth figure worth requesting, since it reports how much of the vial mass is peptide rather than counterion and water. Costs vary widely by supplier, quantity and synthesis scale.

No. Epithalon has no FDA approval for any indication and is not a recognised dietary ingredient. It is sold and labelled as a research chemical for laboratory use, which is a regulatory category distinct from both approved drugs and supplements.

Epithalon and epitalon are two transliterations of the same synthetic tetrapeptide, Ala-Glu-Asp-Gly, and both spellings appear in the indexed literature. Epithalamin is different: it is the earlier polypeptide complex extracted from pineal tissue that the synthetic peptide was modelled on. Searching only one spelling will miss a substantial portion of the published record.

No, and conflating the two is the most common documentation error in this market. HPLC area percent measures how much of the injected sample eluted as a single chromatographic peak. Synthetic peptides are usually isolated as trifluoroacetate salts with residual bound water, so net peptide content by mass is a separate figure requiring amino acid analysis or nitrogen determination.

Because the AEDG sequence contains no aromatic amino acids. Tryptophan, tyrosine and phenylalanine are what produce absorbance at 280 nm, and none of them are present in this four-residue peptide. Quantification has to run at 214 nm, where the peptide bond absorbs, or through amino acid analysis.

Two differences matter most. Its lack of aromatic residues rules out 280 nm detection, which is standard for longer sequences like BPC-157 or TB-500 that contain aromatic amino acids. And its Asp-Gly motif makes aspartimide formation and isoaspartate rearrangement a real analytical concern, a degradation route that leaves nominal mass unchanged and shows up as a retention-time shift on HPLC rather than a mass spectrometry signal.

Unverified material can carry truncated or deletion sequences, residual synthesis reagents, elevated counterion load, or simply a different molecule than the label states. None of that is detectable by eye, and a chromatogram without an accompanying mass spectrum cannot rule it out. The practical consequence in a research setting is irreproducible data traced back to an undocumented input.

Match the lot number on the certificate against the number printed on the vial, then check that the document includes a test date, the instrument method, the detection wavelength and an actual chromatogram rather than a summary table. Certificates reused across every batch of a product describe no specific material. Suppliers who maintain a published, lot-indexed COA library make this check straightforward.

RESEARCH USE ONLY · NOT EVALUATED BY THE FDA