Epitalon (Epithalon / AEDG) Research Guide: What the Studies Show and How to Vet a Vial

Epitalon is a synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly (AEDG), molecular formula C14H22N4O9 and a molar mass near 390.35 g/mol, developed by Vladimir Khavinson’s group as a short-peptide analog of the pineal extract Epithalamin. Its most-cited result is that the peptide induced telomerase activity and telomere elongation in cultured human somatic cells; other preclinical work reported extended lifespan in flies and mice, altered pineal melatonin rhythms in aged monkeys, and fewer chemically induced colon tumors in rats. Almost all of this evidence is in vitro or in animals, and much of it comes from a single research lineage, so it is a preclinical research signal, not a demonstrated human effect. As a research-use-only material, the only thing that separates a real vial from expensive mislabeled powder is a named third-party COA you can independently re-pull before you pay.

Published 2026 - For research use only (RUO). Nothing here is medical advice, a dosing protocol, or a human-use recommendation. The peptides discussed are not approved drugs, and the research cited below is overwhelmingly in vitro and in animal models.

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What Epitalon actually is

Epitalon (spelled variously epithalon, epitalone, or epithalone) is not a plant, a hormone, or a botanical extract. It is a defined four-amino-acid peptide that a chemist can write out completely: L-alanyl-L-glutamyl-L-aspartyl-glycine, abbreviated AEDG from the single-letter codes.

Property	Value
Sequence	Ala-Glu-Asp-Gly (AEDG)
Molecular formula	C14H22N4O9
Molar mass	~390.35 g/mol
CAS number	307297-39-8
Class	Synthetic ultrashort regulatory tetrapeptide
Physical form sold	White lyophilized (freeze-dried) powder

The origin story matters for reading the literature honestly. In the 1980s the St. Petersburg Institute of Bioregulation and Gerontology worked with Epithalamin, a polypeptide complex extracted from the pineal gland. Vladimir Khavinson’s group then designed Epitalon as a single synthetic tetrapeptide intended to reproduce the active motif in a defined, reproducible molecule. So when you read older “Epithalamin” studies, you are reading about the extract, not the tetrapeptide, and the two are not interchangeable even though vendors sometimes blur them. This is the same species of naming caveat that trips buyers up elsewhere in the peptide market, and it is exactly the kind of thing a COA reads back to you when the mass spectrum shows what molecule is actually in the vial.

Because AEDG is so short, it has no complex secondary structure to misfold, which is part of why it is a convenient research peptide to synthesize and analyze. That simplicity does not make it potent or safe in people. It just makes it easy to characterize on an analytical instrument.

What the research actually covers

The framing below reports what published laboratory and animal studies examined. None of it describes an established effect in humans, and none of it is a use instruction. A running caveat applies to the entire body of work: a large share of it originates from Khavinson and collaborators, and independent replication outside that lineage remains limited. Concentrated authorship is not fraud, but it is a reason to treat single-source findings as hypotheses rather than settled facts.

Telomerase and telomeres (cell culture)

The headline result is the one that made Epitalon famous. In cultured human fetal fibroblasts, adding the peptide induced telomerase activity and produced telomere elongation, and the treated cells continued dividing past the point where controls senesced (Khavinson, Bondarev & Butyugov, Bull Exp Biol Med, 2003; PMID 12937682). A follow-up from the same group reported that the peptide let human somatic cells overcome the Hayflick division limit in vitro, with cells surpassing the mitotic ceiling of untreated cultures (Khavinson et al., Bull Exp Biol Med, 2004; PMID 15455129).

This is genuinely interesting cell biology. It is also, critically, cell-culture data. Re-activating telomerase in a dish is not the same as extending a human lifespan, and telomerase biology cuts both ways: the enzyme is a double-edged tool that is also implicated in the immortalization of cancer cells. Anyone reading “telomere elongation in fibroblasts” as a human anti-aging outcome is skipping several logical steps the data do not support.

Lifespan in model organisms

In Drosophila melanogaster (fruit flies), Epitalon was reported to increase mean lifespan relative to controls (Khavinson, Izmaylov, Obukhova & Malinin, Mech Ageing Dev, 2000; PMID 11087911). In mice, a pineal-peptide preparation from the same research program was reported to shift markers of biological age and increase life span (Anisimov, Khavinson et al., Ross Fiziol Zh Im I M Sechenova, 2001; PMID 11227856). Model-organism longevity work is a standard first step in geroscience, but flies and inbred mice are a long way from human physiology, and lifespan effects in short-lived organisms frequently fail to translate.

Pineal function and melatonin rhythm (primates)

Because Epitalon descends from a pineal extract, several studies looked at pineal signaling. In aged rhesus monkeys, pineal peptides were reported to restore age-related disturbances in the hormonal function of the pineal gland and pancreas (Goncharova, Vengerin, Khavinson & Lapin, Exp Gerontol, 2005; PMID 15664732), and a related report described a normalizing effect on the daily melatonin rhythm in old monkeys (Korkushko, Lapin, Goncharova & Khavinson, Adv Gerontol, 2007; PMID 17969590). These describe measured hormone rhythms in animals, not a benefit you should expect or pursue.

Chemically induced tumors (rats)

Two rat studies examined Epitalon in a 1,2-dimethylhydrazine (DMH) colon-carcinogenesis model. Investigators reported that the peptide inhibited colon carcinogenesis induced by DMH (Anisimov, Khavinson, Popovich & Zabezhinski, Cancer Lett, 2002; PMID 12049808), and a companion analysis reported changes in proliferative activity and apoptosis within colon tumors and mucosa (Kossoy, Zandbank, Tendler, Anisimov & Khavinson, Int J Mol Med, 2003; PMID 12964022). Chemoprevention signals in a specific rodent carcinogen model are hypothesis-generating and do not establish an effect in any other species or setting.

Retina and a recent in-vitro report

Epitalon has also been studied in the eye. In rats with hereditary pigmentary dystrophy, the peptide was reported to affect age-specific changes in the retina (Khavinson, Razumovskii, Trofimova & Grigor’yan, Bull Exp Biol Med, 2002; PMID 12170316), and a small clinical report described changes in retinal bioelectrical activity in retinitis pigmentosa (Khavinson et al., Neuro Endocrinol Lett, 2002; PMID 12195242) - a single small human study that has not been widely replicated and should not be read as a treatment. More recently, an independent group outside the original lineage reported that the tetrapeptide enhanced delayed wound healing in an in-vitro model of diabetic retinopathy, describing antioxidant behavior in cell culture (Gatta et al., Stem Cell Rev Rep, 2025; PMID 40493162). That 2025 paper is worth noting precisely because it is one of the few from a different lab.

What the evidence does not show

There are no adequate, controlled human trials establishing efficacy or safety for Epitalon as an injectable in people. It is not FDA-approved, has no USP monograph, and sits squarely in research-use-only territory. The interesting mechanistic data live in dishes and rodents, the authorship is concentrated, and the leap from “telomerase in cultured fibroblasts” to “human longevity” is exactly the kind of overreach a literate buyer should refuse to make.

Reconstitution math (lab-prep only)

This is concentration arithmetic for handling a lyophilized research vial - milligrams of powder divided by millilitres of solvent equals mg/mL. It is not a dosing guide and says nothing about administration or use in any organism.

Epitalon is commonly sold in 10 mg, 20 mg, and 50 mg vials. For a 10 mg vial reconstituted with bacteriostatic water:

Bacteriostatic water added	Concentration	Amount per 0.1 mL (10 units on a U-100 syringe)
1 mL	10 mg/mL (10,000 mcg/mL)	1,000 mcg
2 mL	5 mg/mL (5,000 mcg/mL)	500 mcg
5 mL	2 mg/mL (2,000 mcg/mL)	200 mcg

For a 50 mg vial, multiply the numerator: 50 mg in 2 mL is 25 mg/mL, 50 mg in 5 mL is 10 mg/mL. The arithmetic scales linearly - the “per 0.1 mL” column is just the concentration divided by ten.

Handling notes grounded in the chemistry, not in any use case:

AEDG is a small, hydrophilic peptide and generally dissolves readily in bacteriostatic or sterile water; it does not need heat or acid to reconstitute.
Add solvent slowly down the vial wall rather than blasting it onto the powder, and swirl rather than shake, since mechanical foaming can shear peptides.
Reconstitute under sterile conditions. Store the lyophilized powder frozen (-20 °C) for long-term work; keep reconstituted solution refrigerated (2-8 °C) and use it within a short window, since peptides in solution degrade faster than dry powder.
The math is identical regardless of vial size - always read the actual milligram figure on the COA, not the number in the product name, because the label and the assayed content are not always the same thing.

How to vet an Epitalon vendor

Epitalon is cheap to fake convincingly. A four-residue peptide is easy to underfill, cut, or substitute, and the buyer cannot tell 99% pure AEDG from tinted filler by eye. The only thing that separates a real vial from expensive powder is a third-party COA you can independently verify before you pay. Run every vendor through the same checklist - the same discipline that surfaces the classic vendor red flags applies here without modification.

Checklist item	What to demand	Why it matters
Named third-party lab	An actual lab (Janoshik, Freedom Diagnostics, MZ Biolabs, Colmaric), not “third-party tested”	An unnamed in-house bench is a marketing phrase, not a measurement
Independently verifiable COA	A report you can re-pull at the lab’s own source by accession or verification key	A screenshot you cannot re-check proves nothing
HPLC + mass spec	HPLC for purity, MS to confirm it is AEDG at ~390.35 g/mol	Purity without identity does not prove the molecule is Epitalon
Report visible pre-purchase	COA on the product page, not “email us after you order”	Post-sale reports let a seller show you a different batch
Ships from the US (if that matters to you)	Stated, verifiable shipping origin	Affects transit, customs risk, and recourse

If a vendor fails the first three rows, the purity number on the page is a claim, not a fact. And note the identity check specifically: because AEDG is so light, a mass-spec peak near 390 g/mol is what confirms the vial holds the actual tetrapeptide rather than a heavier or lighter impostor. Reddit threads are a reasonable place to crowd-source which sellers publish verifiable reports, but treat that sourcing carefully - popularity is not a COA.

How Pepora scores

On the checklist above, Pepora’s advantage is the part that is hardest to fake: independently verifiable third-party reports. Its core products are tested by Freedom Diagnostics, a US lab running HPLC, UV, and mass spectrometry, and each report can be re-pulled by accession number at FreedomDiagnosticsTesting.com. As a concrete, checkable example, the GHK-Cu report under accession Pepo2603130126 resolves to 99.98% purity - a figure you confirm yourself at the lab’s site rather than taking on trust.

Here is the honest limitation, because a COA-literacy site that hides it is not worth reading: only three to four SKUs currently carry a full Freedom Diagnostics COA. Third-party coverage is expanding across the catalog, but it is not yet universal, and Epitalon may or may not have a Freedom report live at the moment you look. So do not take “Pepora tests its products” as a blanket guarantee for this specific peptide. Do the exact thing this article tells you to do for every vendor: open the Epitalon product page, find the report, confirm the lab is named, and re-pull it at the source. If a verifiable Freedom or Janoshik report for the Epitalon vial is present, it clears the checklist; if it is not, hold the purchase to the same standard you would hold anyone else’s.

The disclosed pick

Disclosure: coaindex is operated by and affiliated with Pepora and earns a commission on code SINGLES15. This recommendation stands on the checkable COA criteria above, not on the payment.

For single research peptides like Epitalon, Pepora is the disclosed pick.

Pepora's core products are third-party tested by Freedom Diagnostics, a US lab running HPLC, UV, and mass spectrometry, and each report is verifiable by accession number at FreedomDiagnosticsTesting.com so you confirm the numbers yourself. Coverage is still expanding across the catalog, so pull the specific Epitalon report before you buy and hold it to the same five-point check as any other vendor.

See Pepora's COAs

Use code SINGLES15 for 15% off

Verify the accession at FreedomDiagnosticsTesting.com, confirm the mass-spec identity sits near 390 g/mol, and apply the same independent check to every other vendor before you trust a single milligram.

FAQ

What is Epitalon? Epitalon (also spelled epithalon or epitalone) is a synthetic tetrapeptide with the sequence Ala-Glu-Asp-Gly (AEDG), molecular formula C14H22N4O9 and a molar mass near 390.35 g/mol. It was designed by Vladimir Khavinson’s group as a short-peptide analog of Epithalamin, a pineal-gland extract. It is a research-use-only material, not an approved drug.

What does Epitalon research actually show? The best-known finding is that Epithalon induced telomerase activity and telomere elongation in cultured human fibroblasts (Khavinson 2003, PMID 12937682). Other work reported extended lifespan in fruit flies and mice, changes in pineal melatonin rhythms in aged monkeys, and reduced chemically induced colon tumors in rats. Almost all of it is in vitro or in animal models, much of it from a single research group, so treat it as preclinical signal, not proof of a human effect.

How do you reconstitute a 10 mg Epitalon vial? As lab-prep arithmetic only: milligrams of powder divided by millilitres of bacteriostatic water equals mg/mL. 10 mg in 1 mL is 10 mg/mL; 10 mg in 2 mL is 5 mg/mL. This is concentration math for handling a lyophilized research sample and is not a dosing instruction or a use recommendation.

Is Epitalon FDA-approved or legal to buy? Epitalon is not FDA-approved, has no USP monograph, and is not a recognized drug. It is sold only as a research-use-only chemical. That status says nothing about safety or efficacy in people, and no claim of either should be inferred from a vendor listing.

How do I verify an Epitalon COA is real? Confirm the testing lab is named (for example Freedom Diagnostics or Janoshik) rather than an anonymous in-house bench, then re-pull the report at the lab’s own source: for Freedom Diagnostics, look it up by accession number at FreedomDiagnosticsTesting.com; for Janoshik, enter the verification key at janoshik.com/verify. A screenshot you cannot re-check proves little, and the lot number on the report should match the vial in your hand.

Is Epitalon the same as Epithalamin? No. Epithalamin is a polypeptide extract of the pineal gland; Epitalon is a single defined synthetic tetrapeptide (AEDG) developed as a short-peptide analog of it. They are related in origin but are chemically different materials, so research on one does not automatically transfer to the other.

References

Khavinson VKh, Bondarev IE, Butyugov AA. Epithalon peptide induces telomerase activity and telomere elongation in human somatic cells. Bull Exp Biol Med. 2003;135(6):590-592. PMID: 12937682. https://pubmed.ncbi.nlm.nih.gov/12937682/
Khavinson VKh, Bondarev IE, Butyugov AA, Smirnova TD. Peptide promotes overcoming of the division limit in human somatic cells. Bull Exp Biol Med. 2004;137(5):503-506. PMID: 15455129. https://pubmed.ncbi.nlm.nih.gov/15455129/
Khavinson VK, Izmaylov DM, Obukhova LK, Malinin VV. Effect of epitalon on the lifespan increase in Drosophila melanogaster. Mech Ageing Dev. 2000;120(1-3):141-149. PMID: 11087911. https://pubmed.ncbi.nlm.nih.gov/11087911/
Anisimov VN, Khavinson VKh, Zavarzina NIu, Zabezhinskiĭ MA, Zimina OA. [Effect of pineal peptide on parameters of the biological age and life span in mice]. Ross Fiziol Zh Im I M Sechenova. 2001;87(1):125-136. PMID: 11227856. https://pubmed.ncbi.nlm.nih.gov/11227856/
Anisimov VN, Khavinson VKh, Popovich IG, Zabezhinski MA. Inhibitory effect of peptide Epitalon on colon carcinogenesis induced by 1,2-dimethylhydrazine in rats. Cancer Lett. 2002;183(1):1-8. PMID: 12049808. https://pubmed.ncbi.nlm.nih.gov/12049808/
Kossoy G, Zandbank J, Tendler E, Anisimov V, Khavinson V. Epitalon and colon carcinogenesis in rats: proliferative activity and apoptosis in colon tumors and mucosa. Int J Mol Med. 2003;12(4):473-477. PMID: 12964022. https://pubmed.ncbi.nlm.nih.gov/12964022/
Goncharova ND, Vengerin AA, Khavinson VKh, Lapin BA. Pineal peptides restore the age-related disturbances in hormonal functions of the pineal gland and the pancreas. Exp Gerontol. 2005;40(1-2):51-57. PMID: 15664732. https://pubmed.ncbi.nlm.nih.gov/15664732/
Korkushko OV, Lapin BA, Goncharova ND, Khavinson VKh, Shatilo VB. [Normalizing effect of the pineal gland peptides on the daily melatonin rhythm in old monkeys and elderly people]. Adv Gerontol. 2007;20(1):74-85. PMID: 17969590. https://pubmed.ncbi.nlm.nih.gov/17969590/
Khavinson VKh, Razumovskii MI, Trofimova SV, Grigor’yan RA, Chaban TV. Effect of epithalon on age-specific changes in the retina in rats with hereditary pigmentary dystrophy. Bull Exp Biol Med. 2002;133(1):87-89. PMID: 12170316. https://pubmed.ncbi.nlm.nih.gov/12170316/
Khavinson V, Razumovsky M, Trofimova S, Grigorian R, Razumovskaya A. Pineal-regulating tetrapeptide epitalon improves eye retina condition in retinitis pigmentosa. Neuro Endocrinol Lett. 2002;23(4):365-368. PMID: 12195242. https://pubmed.ncbi.nlm.nih.gov/12195242/
Gatta M, Dovizio M, Milillo C, Ruggieri AG, Sallese M. The Antioxidant Tetrapeptide Epitalon Enhances Delayed Wound Healing in an in Vitro Model of Diabetic Retinopathy. Stem Cell Rev Rep. 2025;21(6):1822-1834. PMID: 40493162. https://pubmed.ncbi.nlm.nih.gov/40493162/

Full disclosure: coaindex is operated by and affiliated with Pepora (peporalabs.com) and earns a commission on purchases made through its links and the coupon code SINGLES15. Research use only. Not for human or veterinary use. This page is educational and does not provide medical advice, dosing guidance, or therapeutic claims. Epitalon is not an approved drug, and the research summarized here is overwhelmingly in vitro and in animal models.