Research Guide · Epithalon

What is Epithalon?

A comprehensive examination of the pineal tetrapeptide’s role in telomerase activation, circadian regulation, and longevity research.

Updated September 2026 Research Use Only 12 min read

What is Epithalon

Introduction to epithalon’s chemistry, origins, and significance in cellular senescence and longevity research models.

Pineal Analogue

A synthetic tetrapeptide (Ala-Glu-Asp-Gly) developed as the active component of epithalamin, a naturally occurring peptide complex extracted from the bovine pineal gland.

Khavinson Discovery

Synthesised by Vladimir Khavinson at the St Petersburg Institute of Bioregulation and Gerontology in the late 1980s, epithalon emerged as a key tool for studying age-related hormonal decline and telomere biology.

Research Foundation

For in-vitro laboratory research into cellular senescence, circadian dynamics, and longevity mechanisms—not for human consumption.

Mechanism of Action

How epithalon modulates telomerase expression, circadian rhythms, and age-related neuroendocrine decline in cellular and organism-level models.

Telomerase Activation & Telomere Extension

Epithalon upregulates human telomerase reverse transcriptase (hTERT) gene expression in human somatic cells, driving synthesis of the catalytic subunit of telomerase. This elevated telomerase activity elongates telomeres in fibroblast cultures; in human lung fibroblasts, epithalon treatment produced a 2.4-fold increase in telomere length and extended cellular replicative lifespan beyond the Hayflick limit (Khavinson et al., 2003).

Pineal Restoration & Circadian Rhythm Synchronisation

Epithalon stimulates evening melatonin synthesis in senescent primates, normalising the circadian rhythm of melatonin production that declines sharply with age. In aged rhesus monkeys, epithalon restored the evening peak in melatonin and synchronised the inverse diurnal rhythm of cortisol (Anisimov et al., 2003).

Epigenetic & Metabolic Reprogramming

Beyond telomerase, epithalon modulates five hallmarks of ageing: telomere maintenance, epigenetic regulation, oxidative stress resilience, immune system recalibration, and circadian homeostasis. These effects likely operate through changes in NAD+-dependent signalling (SIRT1 activity), mitochondrial function, and redox balance.

Longevity & Healthspan Extension in Animal Models

In rodent models, chronic epithalon administration prolonged mean lifespan by approximately 12–27% depending on strain and protocol (Anisimov et al., 2001; Anisimov & Khavinson, 2010). Treatment also reduced incidence and delayed onset of spontaneous tumours. Note that all lifespan studies originate from the Khavinson laboratory; independent replication by major Western longevity research programmes has not yet been reported.

Epithalon vs Related Longevity Peptides

Comparison of epithalon’s mechanisms, specificity, and research applications against complementary longevity peptides.

Property

Epithalon

NAD+ / MOTS-c / GHK-Cu

Primary Mechanism

hTERT upregulation; pineal tropism

SIRT1, AMPK, collagen synthesis

Molecular Weight

390.35 Da

NAD+ 663 Da; MOTS-c ~2.2 kDa; GHK-Cu ~402 Da

Target Tissue

Somatic cells, pineal-tropic

Systemic; tissue-specific

Circadian Effects

Direct (melatonin restoration)

Indirect or absent

Replicative Lifespan Extension

Confirmed in vitro (Hayflick exceeded)

Indirect via mitochondrial / DNA repair

Key Research Applications

Primary research domains for epithalon in cellular senescence, circadian biology, and longevity studies.

Telomere Maintenance & Senescence Models

Epithalon is used to study telomere–telomerase biology and replicative senescence. By inducing hTERT expression and extending telomere length in cultured human fibroblasts, it permits investigation of whether telomere lengthening alone can overcome the Hayflick limit and reverse cellular senescence.

Circadian Rhythm Restoration & Neuroendocrine Ageing

Epithalon’s ability to restore evening melatonin peaks in aged primates makes it valuable for studying somatopause, gonadopause, and thyroid hormone dysregulation. Researchers use it to model whether pineal peptide supplementation can reverse circadian desynchronisation and downstream effects on sleep, immunity, and metabolism.

Longevity & Healthspan Extension Protocols

In rodent lifespan studies, epithalon has been administered chronically (typically 5-day injection courses at ~0.1 µg per mouse) to assess total lifespan, median lifespan, maximum lifespan, and age-related pathology including tumour incidence.

Epigenetic & Hallmark Investigation

Emerging research explores epithalon’s effects on additional hallmarks of ageing: epigenetic modifications (DNA methylation, histone marks), oxidative stress homeostasis, immune dysregulation, and mitochondrial dysfunction. Preliminary work suggests upregulation of antioxidant defences (SOD, catalase) and improved mitochondrial respiratory capacity.

Combination Longevity Studies

Researchers combine epithalon with NAD+ boosters, SIRT1 activators, mitochondrial-targeted peptides and antioxidants to test synergistic models of ageing reversal addressing multiple pathways simultaneously—telomere maintenance, NAD+ signalling, circadian synchronisation, and mitochondrial biogenesis.

Quick Reference · Specifications

Essential biochemical and pharmaceutical parameters.

P · 01

Peptide Name

Epithalon (also: Epitalon, AEDG)

P · 02

Amino Acid Sequence

Ala-Glu-Asp-Gly (tetrapeptide)

P · 03

Molecular Formula

C14H22N4O9

P · 04

Molecular Weight

390.35 Da

P · 05

CAS Number

307297-39-8

P · 06

Primary Mechanism

hTERT upregulation; pineal tropism; circadian restoration

P · 07

Format

Lyophilised powder; analytical grade

P · 08

Purity

≥99% (HPLC verified)

P · 09

Storage (Powder)

2–8°C, protected from light; stable years

P · 10

Storage (Reconstituted)

2–8°C with bacteriostatic water; stable 2–4 weeks

Reconstitution & Storage Guidance

Best practices for maintaining peptide stability and bioactivity.

Reconstitution Medium & Technique

Reconstitute with bacteriostatic water (0.9% NaCl with 0.9% benzyl alcohol). Use aseptic technique with sterile syringes and needles. Allow powder to dissolve gently at room temperature without vigorous agitation. Typical concentrations 1–10 mg/mL.

Stability & Storage Timeline

Unopened lyophilised vials are stable for years at 2–8°C. Reconstituted solutions maintain activity for 2–4 weeks at 2–8°C. Avoid freeze–thaw cycles. Aliquot small volumes immediately after reconstitution to minimise repeated access to primary stock.

Visual Inspection & Quality Control

Reconstituted solutions should be clear and colourless to pale yellow. Cloudiness, particulates, or discoloration indicates degradation; discard immediately. Sterile 0.22 µm syringe filters may be used if needed.

Handling Best Practices

Maintain refrigeration; minimise air exposure; avoid shaking; use fresh sterile needles for each withdrawal; never expose to direct sunlight or heat; document reconstitution date; discard solutions older than 4 weeks or showing visual degradation.

Key Published Research

Peer-reviewed studies behind epithalon’s research profile.

2003

Telomerase in human cells

Adding epithalon to cultured human somatic cells induced telomerase catalytic-subunit expression, telomerase activity and telomere elongation.¹

2003

Lifespan in mice

In female SHR mice, epithalon slowed age-related changes in several biomarkers, extended lifespan and reduced spontaneous tumour incidence.²

2025

Independent review

A 2025 overview in the International Journal of Molecular Sciences summarised epithalon’s reported effects on telomeres, circadian rhythm, antioxidant defences and gene expression, and stressed the need for independent confirmation.³

Regulatory & Research Status

Where epithalon stands in 2026.

APR 26

FDA Category 2 removal

Epithalon was one of twelve peptides removed from the US FDA’s Category 2 compounding list. This is not an approval.

JUL 26

Advisory committee vote

The FDA’s Pharmacy Compounding Advisory Committee voted narrowly in favour of adding epithalon to the 503A bulks list for a proposed insomnia use. The vote is non-binding.

UK / EU

Approval status

Epithalon is not an approved medicine in the UK, EU or US.

Evidence Quality & Limitations

As noted above, nearly all epithalon research — including the lifespan, melatonin and telomerase findings — comes from Khavinson’s institute and its collaborators, and independent replication by other groups is still limited. Most human data come from small Russian studies of the parent extract epithalamin rather than controlled trials of the synthetic tetrapeptide.

References

Khavinson VKh, et al. Epithalon peptide induces telomerase activity and telomere elongation in human somatic cells. Bull Exp Biol Med. 2003;135:590–2. PubMed
Anisimov VN, et al. Effect of Epitalon on biomarkers of aging, life span and spontaneous tumor incidence in female Swiss-derived SHR mice. Biogerontology. 2003;4:193–202. PubMed
Araj SK, et al. Overview of Epitalon — highly bioactive pineal tetrapeptide with promising properties. Int J Mol Sci. 2025;26. PubMed

⚠ Research Use Only. The compounds discussed in this guide are intended strictly for in-vitro laboratory research. They are not intended for human consumption, therapeutic use, or veterinary application. Researchers must comply with all applicable local regulations.