Epitalon is a synthetic pineal tetrapeptide that activates telomerase (hTERT) to extend telomere length; Humanin is a mitochondria-derived peptide (mitokine) that suppresses apoptosis via STAT3 and reduces cellular stress — two mechanistically distinct longevity pathways.
Research reference only — all information on this page summarises peer-reviewed scientific literature and does not constitute medical advice. View full compound profiles: Epitalon · Humanin
Mechanism Comparison
Epitalon (Ala-Glu-Asp-Gly) is a synthetic analogue of epithalamin, a peptide secreted by the pineal gland. Its primary documented mechanism is activation of telomerase reverse transcriptase (hTERT), leading to telomere elongation in cultured cells and in rodent models — directly addressing one of the proposed molecular drivers of cellular senescence. Humanin is a 21-amino-acid mitochondria-derived peptide encoded in the 16S rRNA region of the mitochondrial genome. It acts as a cytoprotective mitokine, signalling through gp130/CNTFR/IL-27Rα receptor complexes to activate STAT3 and suppress apoptosis, and directly binding to Bax to prevent mitochondrial-pathway cell death. These two compounds target different hallmarks of aging: telomere attrition (Epitalon) versus mitochondrial dysfunction and apoptosis (Humanin).
Side-by-Side Attributes
| Attribute | Epitalon | Humanin |
|---|---|---|
| Peptide origin | Synthetic — pineal gland analogue (Ala-Glu-Asp-Gly) | Mitochondria-encoded (16S rRNA locus); 21 amino acids |
| Molecular weight | 390.4 g/mol | ~2,679 Da |
| CAS number | 307297-39-8 | 330936-69-1 |
| Primary mechanism | Telomerase (hTERT) activation → telomere elongation | STAT3 activation; Bax binding → apoptosis suppression |
| Aging hallmark targeted | Telomere attrition | Mitochondrial dysfunction / apoptosis dysregulation |
| CNS research data | Antioxidant effects in brain; circadian modulation | Neuroprotective (Alzheimer's model data; Aβ binding) |
| Cardiovascular research | Limited cardiac data | Cardioprotective effects in ischemia models |
| Half-life (est.) | Short (minutes); lipid-soluble analogues exist | Short (~30 min); S14G-Humanin analogue has extended activity |
| Regulatory status | Investigational; research compound | Investigational; research compound |
Key Research Points
- 1Epitalon's telomerase activation mechanism targets telomere attrition — one of the nine hallmarks of aging described by López-Otín et al. (Cell, 2013). Published data show telomere elongation in human somatic cells and extended lifespan in rodent models.
- 2Humanin is endogenously produced — it is encoded in the mitochondrial genome and detectable in human plasma, declining with age. Its status as a mitokine (mitochondria-derived hormone) makes it mechanistically distinct from synthetic peptides: it is part of the physiological aging biology, not just a pharmacological tool.
- 3S14G-Humanin (HNG) is a potent synthetic analogue of Humanin with ~1,000-fold greater in vitro neuroprotective potency than native Humanin. Most contemporary Humanin research uses HNG rather than the native sequence.
- 4The two compounds address non-overlapping molecular targets and are sometimes studied together in longevity protocols that aim to simultaneously address telomere maintenance (Epitalon) and mitochondrial apoptosis suppression (Humanin).
- 5Both compounds lack Phase 3 human clinical trial data under Western regulatory frameworks. Most longevity efficacy data comes from in vitro cell studies and rodent lifespan models; human data is limited to small Russian clinical studies for Epitalon.
Frequently Asked Questions
What is the main difference between Epitalon and Humanin?
Epitalon is a synthetic pineal tetrapeptide (4 amino acids) whose primary documented mechanism is activation of telomerase (hTERT), leading to telomere elongation — it targets the cellular aging hallmark of telomere attrition. Humanin is a 21-amino-acid peptide encoded in the mitochondrial genome that acts as a cytoprotective mitokine: it activates STAT3 via gp130 receptor complexes and directly binds Bax to suppress apoptosis — targeting mitochondrial dysfunction and programmed cell death. They represent two distinct longevity pathways: telomere biology (Epitalon) versus mitochondrial cytoprotection (Humanin).
Does Epitalon actually lengthen telomeres in research?
Telomere elongation following Epitalon exposure has been documented in published in vitro studies using human somatic cells. Khavinson et al. reported hTERT activation and measurable telomere length increases in human fibroblasts after Epitalon treatment in multiple publications. Rodent longevity studies (Anisimov et al.) also demonstrated extended median lifespan in Epitalon-treated animals. However, direct evidence in human subjects from controlled clinical trials is limited; most mechanistic data comes from cell cultures and animal models. The translational relevance to human telomere biology in vivo remains an open research question.
Is Humanin produced naturally in the human body?
Yes — Humanin is an endogenous peptide encoded within the 16S ribosomal RNA region of the human mitochondrial genome and is naturally produced in multiple tissues. It is detectable in human plasma, cerebrospinal fluid, and various organ tissues. Circulating Humanin levels decline with age, and lower Humanin levels have been associated with age-related conditions in observational studies. This endogenous status distinguishes Humanin from purely synthetic research peptides and has driven interest in supplementation research to restore declining Humanin levels.
Deep Dive
For extended mechanism analysis, trial data, and regulatory context, see the full research article:
Best Peptides for Longevity Research: Evidence Review →Full compound profile
Epitalon
Full compound profile
Humanin