Epithalon (Epitalon) · Research brief

Epitalon vs DSIP: Two Pineal Peptides Compared

Real Peptides Research TeamEditorial

Updated September 28, 20269 min read

57 WORDS

Short answer

The most common mistake researchers make with epitalon vs dsip isn't about mechanism. It's about spelling. Epitalon and epithalon are the same molecule, the synthetic tetrapeptide Ala-Glu-Asp-Gly, while DSIP (delta sleep-inducing peptide) is a structurally unrelated nine-residue peptide first isolated in the 1970s by Schoenenberger and Monnier from the cerebral venous blood of rabbits during delta-wave sleep.

Key takeaways

Epitalon vs epithalon is a spelling question, not a chemistry question: both names refer to the tetrapeptide Ala-Glu-Asp-Gly, CAS 307297-39-8.
Epithalamin is a bovine pineal tissue extract, not a synthetic peptide, and should never be treated as interchangeable with Epitalon.
Epitalon vs DSIP compares a 4-residue synthetic tetrapeptide near 390 Da with a 9-residue endogenous peptide near 849 Da, with no sequence overlap between them.
DSIP was named after the state of the animals it was isolated from, and reliable sleep induction has not replicated consistently across laboratories.
Pinealon is the tripeptide Glu-Asp-Arg from the same research program as Epitalon, with published work centred on cortical neurons under hypoxic stress rather than on telomere biology.
Verifying CAS number, molecular weight and sequence against a published certificate of analysis is the only way to confirm what a vial actually contains.

Our team fields this question from lab procurement staff more often than almost any other pineal-peptide query. Both compounds turn up in the same review articles on pineal signalling and sit near each other in the same supplier catalogs. Structurally and experimentally, they share almost nothing.

What is the difference between epitalon vs dsip?

Epitalon vs DSIP compares two unrelated peptides. Epitalon (Epithalon) is a synthetic four-residue peptide, Ala-Glu-Asp-Gly, with a molecular weight near 390 Da, studied in pineal, melatonin and telomere biology. DSIP is a nine-residue endogenous peptide near 849 Da, studied in delta EEG activity and stress-axis regulation. Different sequences, different literature entirely.

The over-simplification worth correcting is the habit of filing both under the heading of sleep peptides when only one was named for sleep. Epitalon's link to sleep research runs indirectly through pineal melatonin rhythm rather than through EEG architecture, and DSIP's own sleep-induction findings have been inconsistent across replication attempts. Epitalon vs DSIP is not a like-for-like matchup. This piece covers the epitalon vs epithalon naming question, what each peptide's published literature actually targets, how Pinealon differs from both, and what a lab should verify before procurement.

One compound, three names: Epitalon, Epithalon, Epithalamin

Epitalon and epithalon are the same substance. The two spellings are competing transliterations of the same Russian-origin name, and you'll also see Epithalone and Epitalone in older listings. The compound is the tetrapeptide Ala-Glu-Asp-Gly, abbreviated AEDG, with CAS number 307297-39-8 and a molecular weight of roughly 390 Da.

Epithalamin is the one that genuinely differs. It's a polypeptide extract prepared from bovine pineal tissue, developed by Vladimir Khavinson's group at the St. Petersburg Institute of Bioregulation and Gerontology. Epitalon was synthesised as a defined short-peptide analogue of that extract's active fraction, which is why the two names travel together in the literature but describe very different materials: one a tissue-derived mixture, one a four-residue synthetic sequence.

This matters for procurement more than it matters for theory. The epitalon vs dsip mix-up is compounded by the fact that a catalog name carries no analytical weight at all. Our team's standing recommendation to labs is to match three things before a purchase order goes out: the CAS number, the stated molecular weight, and the amino acid sequence printed on the certificate of analysis. If a listing gives a name and a milligram figure and nothing else, there's no way to confirm what's in the vial.

What each peptide's published literature actually targets

Epitalon research clusters around the pineal gland's role in ageing: regulation of melatonin secretion rhythm, and, in cell-culture work from Khavinson's institute, reported activation of telomerase with elongation of telomeres in cultured human somatic cells. DSIP research clusters around central nervous system sleep and stress circuitry: delta-wave EEG power, corticotropin and cortisol responses, and a substantial body of 1980s work in opioid withdrawal and nociception models. That divergence is the whole of epitalon vs dsip as a research question.

Here's the nuance most comparisons skip. DSIP is arguably misnamed. The peptide was named for the physiological state of the animals it was isolated from, not for a demonstrated causal mechanism, and efforts to reproduce reliable sleep induction across species and laboratories have been uneven since the early 1980s. Much of the modern DSIP literature has drifted toward stress-axis modulation and pain research rather than sleep itself. So a protocol built around epitalon vs dsip with a sleep endpoint is leaning the DSIP arm against the shakier half of its own name.

There's a practical consequence too. Studies report a plasma half-life for DSIP on the order of minutes, which is why tagged analogues such as Tyr-DSIP appear so often in tracing and receptor-binding work. Short peptides in the Epitalon and Pinealon family face the same peptidase problem. In our experience supporting research groups, that instability is the variable most likely to wreck a comparison study, not the choice of compound.

Where Pinealon fits, and what a peptide bioregulator is

Pinealon is the tripeptide Glu-Asp-Arg (EDR), around 418 Da, and it comes from the same Khavinson research program that produced Epitalon. The epitalon vs pinealon distinction is straightforward on paper: four residues versus three, with reported research focus on pineal and telomere biology for the former and on cortical neuron viability under hypoxic and oxidative stress in rodent models for the latter.

The term peptide bioregulator is worth defining, since suppliers use it loosely. It refers to Khavinson's hypothesis that very short peptides can enter cells, interact with DNA or chromatin-associated proteins, and influence gene expression in a tissue-selective way. It is a hypothesis with a real publication record, largely from one research school, and it is not equivalent to a characterised receptor mechanism of the kind DSIP has been probed for.

Quality control is where a supplier either earns trust or doesn't. Real Peptides synthesises in small batches with exact amino-acid sequencing and publishes certificates showing identity and purity confirmed by HPLC and mass spectrometry, so a lab can verify the molecule rather than the marketing. Labs sourcing Pinealon alongside the other two compounds should compare batch documents rather than product descriptions. Everything discussed here is supplied for laboratory research use only, is not an FDA-approved drug, and is not for human or veterinary consumption.

Epitalon vs DSIP: Side-by-Side Research Comparison

This table sets the three pineal-adjacent peptides against each other on the attributes that actually change a study design. Sequence and stability matter far more than the category label they get sold under.

Attribute	Epitalon (Epithalon)	DSIP	Pinealon	Bottom line for researchers
Sequence and size	Ala-Glu-Asp-Gly (AEDG), 4 residues, approx 390 Da, CAS 307297-39-8	Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu, 9 residues, approx 849 Da	Glu-Asp-Arg (EDR), 3 residues, approx 418 Da	The sequence, not the trade name, is the only reliable identifier; confirm it on the certificate
Origin	Synthetic analogue derived from the bovine pineal extract Epithalamin	Endogenous peptide isolated from rabbit cerebral venous blood during delta sleep	Synthetic short peptide from the same bioregulator research program as Epitalon	Only DSIP was isolated as a naturally occurring mammalian peptide
Main reported research focus	Pineal function, melatonin rhythm, telomerase activity in cell culture, rodent lifespan models	Delta EEG activity, stress-axis and corticotropin responses, opioid withdrawal models	Cortical neuron viability under hypoxic and oxidative stress in rodent models	The overlap between all three is thematic, not mechanistic
Stability profile	Rapidly degraded by peptidases; supplied as lyophilised powder, stored at -20C and protected from light and moisture	Reported plasma half-life on the order of minutes; analogues such as Tyr-DSIP used in tracing work	Same short-peptide degradation profile; supplied as lyophilised powder	Cold-chain integrity affects results more than any label claim
Literature depth	Substantial output from a single institute, limited independent replication	Decades of independent work across multiple labs, inconsistent sleep-induction replication	Narrowest literature of the three	Weigh replication breadth, not raw citation volume

What If: Sourcing and Handling Scenarios

What if one supplier lists Epithalon and another lists Epitalon?

Compare the certificates rather than the names. Both spellings should resolve to the same sequence, Ala-Glu-Asp-Gly, the same CAS number, and a molecular weight near 390 Da. If the two documents disagree on any of those three fields, the difference is not transliteration and one of the listings is describing a different material, possibly Epithalamin extract or an unrelated peptide sold under a borrowed name.

What if the stated molecular weight doesn't match the certificate?

Stop the procurement and request the raw analytical data. Mass spectrometry output on a certificate should show a parent ion consistent with the claimed peptide, and a mismatch of even a few daltons can indicate a deletion sequence, an incorrect residue, or a salt-form discrepancy that changes net peptide content. Our team has seen sequence errors slip past visual inspection of a COA summary page more than once.

What if a study needs a sleep endpoint and the team is weighing epitalon vs dsip?

Check the endpoint against the primary literature before committing either compound. DSIP has the more direct EEG literature, though the sleep-induction findings are contested, while Epitalon's sleep-adjacent reports run through pineal melatonin rhythm rather than through delta-wave architecture. Choosing on name similarity alone tends to produce a study design that neither peptide's evidence base supports.

What if a researcher asks for dosing or preparation guidance?

Real Peptides does not provide dosing, reconstitution or administration guidance for any catalog compound, because these are research-use-only materials and study parameters belong to the research protocol. What documentation can establish is identity and quantity: a certificate of analysis states the mass of peptide in the vial, and concentration in milligrams per millilitre is simply that stated mass divided by the solvent volume the protocol specifies.

The Unromantic Truth About Pineal Peptide Claims

Here's the honest answer: the popular framing of epitalon vs dsip as rival anti-ageing and sleep compounds badly overstates what either literature supports. Epitalon's telomerase findings come overwhelmingly from one research institute, much of it published in Russian-language journals with limited independent replication, and cell-culture telomere elongation is a long way from an organism-level outcome. DSIP has broader independent study behind it, and that breadth is precisely what exposed the inconsistency of its sleep effects. Neither compound has the evidence base its marketing copy implies. Both are legitimate research subjects. That is a different claim.

Researchers comparing these compounds can review the catalog entries for Epithalon and DSIP, read the longer DSIP research overview, check batch documentation on our certificates of analysis page, or browse the full research catalog.

The epitalon vs dsip question nearly always arrives dressed as a mechanism question when it is really a nomenclature and sourcing question. A tetrapeptide named after a gland and a nonapeptide named after a brainwave were never going to substitute for one another, and the spelling variants surrounding Epitalon exist because a Soviet-era research program's naming conventions crossed into English piecemeal. Treat the names as historical artifacts. Treat the sequence, the CAS number and the certificate as the actual data.

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

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Questions

Yes. Epitalon and epithalon are two transliterations of the same compound name, referring to the synthetic tetrapeptide Ala-Glu-Asp-Gly with CAS number 307297-39-8 and a molecular weight of roughly 390 Da. You may also see it written as Epithalone or Epitalone. Epithalamin, by contrast, is a different material: a polypeptide extract prepared from bovine pineal tissue rather than a defined synthetic sequence.

The two peptides are studied in almost entirely separate literatures. Epitalon research focuses on pineal function, melatonin rhythm, and telomerase activity in cultured cells, largely from the St. Petersburg Institute of Bioregulation and Gerontology. DSIP research focuses on delta-wave EEG activity, stress-axis and corticotropin responses, and older work in opioid withdrawal models. They share no sequence similarity and no common mechanism.

No. Epitalon is a 4-residue synthetic peptide near 390 Da and DSIP is a 9-residue endogenous peptide near 849 Da, with different reported targets and different stability profiles. Substituting one for the other changes the compound class, the relevant literature, and the analytical methods needed to verify the material. Any comparison study should treat them as separate arms with separate endpoints.

Both come from the same peptide bioregulator research program, but they differ in sequence and reported focus. Epitalon is the tetrapeptide Ala-Glu-Asp-Gly studied mainly in pineal and telomere biology. Pinealon is the tripeptide Glu-Asp-Arg, around 418 Da, with published work centred on cortical neuron viability under hypoxic and oxidative stress in rodent models. Same research school, different molecules, different endpoints.

DSIP was named for the physiological state of the animals it was isolated from, not for a confirmed causal mechanism. Schoenenberger and Monnier recovered it in the 1970s from the cerebral venous blood of rabbits in delta-wave sleep, and the name stuck. Later replication attempts across species and laboratories produced inconsistent sleep-induction results, and much of the later literature moved toward stress-axis and pain research instead.

Match three fields against the certificate of analysis: the CAS number, the stated molecular weight, and the full amino acid sequence. HPLC establishes purity and mass spectrometry confirms the parent ion mass corresponds to the claimed peptide. A listing that offers only a product name and a milligram figure provides no way to confirm identity, which is why Real Peptides publishes certificates for each batch.

Lyophilised peptide powder is typically held at -20C, protected from light and moisture, as specified in the product documentation for each batch. Short peptides are vulnerable to peptidase degradation and to moisture uptake once a vial is opened, and temperature excursions during shipping are a common source of unexplained variability. Cold-chain integrity during transit matters as much as storage conditions in the lab.

Research use only means the compound is supplied for laboratory investigation and is not an approved drug product for human or veterinary use. Real Peptides does not provide dosing, preparation or administration guidance for any catalog compound, because those parameters belong to a research protocol and its oversight framework. Supplier documentation covers identity, purity and quantity, nothing beyond that.

Pricing varies widely by peptide, vial size, batch quantity and the depth of analytical documentation supplied. Peptides with longer sequences and more difficult syntheses generally carry higher unit costs than short tripeptides and tetrapeptides. The larger cost variable is usually quality control: suppliers that run and publish HPLC and mass spectrometry on every batch price differently from those that do not test at all.

Tyr-DSIP is a tyrosine-extended analogue used because the added tyrosine residue provides a site for radiolabelling, which makes tracing and receptor-binding work feasible. Native DSIP has a reported plasma half-life on the order of minutes, so tracking its distribution directly is difficult. Seeing Tyr-DSIP in a paper does not mean the study examined the native peptide under identical conditions.

For most research questions, no. The two peptides are grouped together largely because both appear in pineal and neuroendocrine discussions, not because they share a mechanism or a target. A more useful comparison is Epitalon against Pinealon, since both come from the same short-peptide bioregulator program and are studied under similar experimental assumptions.

Reports of telomerase activation and telomere elongation in cultured human somatic cells come primarily from Khavinson's group and associated publications, with limited independent replication outside that research school. Cell-culture telomere findings do not establish organism-level outcomes, and the popular framing of Epitalon as an anti-ageing compound runs well ahead of what the published record supports. It remains a legitimate subject of laboratory research.

RESEARCH USE ONLY · NOT EVALUATED BY THE FDA