Epitalon vs Thymosin Alpha-1
Both short peptides with claimed longevity relevance, but with drastically different evidence bases. A useful contrast in how to weigh literature.
Cellular
Epitalon
Synthetic tetrapeptide studied for telomerase activity and pineal regulation in cell and animal models.
Specialty
Thymosin Alpha-1
28-amino-acid thymic peptide studied for Toll-like receptor signaling and T-cell maturation.
Side by side
| Dimension | Epitalon | Thymosin Alpha-1 |
|---|---|---|
| Molecular weight A 8.0× difference in mass — these are not comparable on a milligram-for-milligram basis. | 390.35 g/mol | 3108.3 g/mol |
| Size class | small molecule / short peptide | mid-length peptide |
| CAS number | 307297-39-8 | 62304-98-7 |
| Research area | longevity | specialty |
| Sequence | Ala-Glu-Asp-Gly | Not published as a linear sequence |
| Available sizes | 10mg, 50mg | 10mg |
| Entry price | $39 | $59 |
| Cost per mg Cost per milligram differs by more than 3×. Compare against the concentrations your protocol actually requires, not the headline vial price. | $1.38 | $5.90 |
Mechanism
Epitalon
Epitalon is a synthetic tetrapeptide (Ala-Glu-Asp-Gly) developed from research on pineal gland extracts. Published work has examined effects on telomerase expression in somatic cell cultures and circadian regulation in aged animals. A candid note on the evidence base: much of the foundational literature comes from a single institute and is not widely independently replicated. Researchers should weight it accordingly.
Thymosin Alpha-1
Thymosin alpha-1 is a 28-amino-acid N-terminally acetylated peptide originally isolated from thymic tissue. It is among the better-characterized immunomodulatory peptides, with published mechanism centering on TLR2 and TLR9 signaling in dendritic cells and downstream effects on T-cell differentiation. Unlike much of this catalog, it has an established clinical literature under the name thymalfasin.
Evidence quality
Mechanism is not the same as evidence. Where we have assessed the literature, the verdict is stated plainly.
Epitalon
Evidence base: moderate volume, narrow provenance. A large share originates from one group. The telomerase mechanism is the most testable claim and has recently attracted work from outside that group, which is where replication should be sought.
Full research reference →Thymosin Alpha-1
Evidence base: the largest and highest-quality in this catalogue after the incretin compounds. Multiple approved indications and a 2025 randomised phase 3 sepsis trial. The modulatory mechanism is context-dependent and correspondingly harder to interpret than a simple agonist relationship.
Full research reference →Research applications
Epitalon
- Telomerase activity assays in fibroblast culture
- Melatonin rhythm and pineal function studies
- Cellular senescence marker profiling
- Chromatin structure research in aged cell models
Thymosin Alpha-1
- TLR2 and TLR9 signaling assays in dendritic cell culture
- T-cell maturation and differentiation studies
- Cytokine profiling (IL-2, IFN-γ) in immune models
- Vaccine adjuvant research
Common questions
What is the difference between Epitalon and Thymosin Alpha-1?
Epitalon is synthetic tetrapeptide studied for telomerase activity and pineal regulation in cell and animal models. Thymosin Alpha-1 is 28-amino-acid thymic peptide studied for Toll-like receptor signaling and T-cell maturation. They differ in molecular weight (390.35 vs 3108.3 g/mol) and in the pathways they are studied against.
Which is more cost-effective per milligram, Epitalon or Thymosin Alpha-1?
Epitalon is lower at approximately $1.38 per milligram at its best tier, against $5.90 for the other. Cost per milligram is only meaningful relative to the concentrations a given protocol requires, since these compounds are not used at comparable masses.
Can Epitalon and Thymosin Alpha-1 be studied together?
Combination designs appear in the published literature for a number of these compounds. Whether it is appropriate for a given protocol depends entirely on the model and endpoint. We supply research compounds and do not provide protocol guidance — consult the primary literature for your specific model.
How should Epitalon and Thymosin Alpha-1 be stored?
Store lyophilized powder at -20°C protected from light. Reconstituted solution stable at 2-8°C for up to 30 days. For Thymosin Alpha-1: Store lyophilized at -20°C protected from light. Reconstituted at 2-8°C for up to 30 days.
Which has the stronger evidence base?
Epitalon — Evidence base: moderate volume, narrow provenance. A large share originates from one group. The telomerase mechanism is the most testable claim and has recently attracted work from outside that group, which is where replication should be sought. Thymosin Alpha-1 — Evidence base: the largest and highest-quality in this catalogue after the incretin compounds. Multiple approved indications and a 2025 randomised phase 3 sepsis trial. The modulatory mechanism is context-dependent and correspondingly harder to interpret than a simple agonist relationship.
All products sold on this website are intended for research and identification purposes only. These products are not intended for human dosing, injection, or ingestion.
Comparison generated from Lyra Vital catalog data. Every specification is reconciled against the certificate of analysis for the shipped batch.