Epitalon vs Thymosin Alpha-1
Epitalon (Synthetic tetrapeptide (pineal bioregulator)) and Thymosin Alpha-1 (Immunomodulatory peptide (thymic)) are documented as co-studied in the PeptiDex library. This page puts the two entries side by side on class, molecular weight, half-life, origin, mechanism and studied research areas — every value taken from the entry it belongs to.
Why these two are co-studied
Cross-referenced for research context — not a usage or combination recommendation.
At a glance
| Attribute | Epitalon | Thymosin Alpha-1 |
|---|---|---|
| Compound class | Synthetic tetrapeptide (pineal bioregulator) | Immunomodulatory peptide (thymic) |
| Research category | Longevity & Cellular | Longevity & Cellular |
| Length (amino acids) | 4 amino acids | 28 amino acids |
| Molecular weight | 390.35 g/mol | 3108 g/mol (approx.) |
| Half-life | Not documented | ~2 hours (circulating) |
| Origin | Epitalon (also spelled Epithalon) is a synthetic tetrapeptide developed in Russia by Vladimir Khavinson and colleagues, designed as a short-peptide analog derived from studies of the pineal extract Epithalamin. It emerged from Russian peptide bioregulator research aimed at tissue-specific regulatory peptides. | Thymosin alpha-1 (Thymalfasin) is a 28-amino-acid peptide originally isolated from thymosin fraction 5 of thymic tissue and later produced synthetically. It corresponds to a fragment of the precursor protein prothymosin alpha and is naturally acetylated at its N-terminus. |
“Not documented” means the PeptiDex entry records no value for that field. Nothing on this page is estimated, and no figure is carried over from one compound to the other.
How Epitalon works
Epitalon is proposed to act as a peptide bioregulator influencing gene expression and pineal function. Reported preclinical mechanisms include modulation of the pineal gland and melatonin regulation, and studies have described effects on telomerase activity and telomere length in cultured human cells. The precise molecular mechanism in vivo is not fully established, and much of the mechanistic data comes from cell-culture and animal models.
How Thymosin Alpha-1 works
Thymosin alpha-1 acts as an immunomodulator, reported to enhance T-cell maturation and function, influence dendritic cell activity, and modulate innate immune signaling including Toll-like receptor pathways. It has been studied for augmenting responses to antigens and vaccines and for regulating immune responses in infection and cancer contexts. Its effects are attributed to broad immune-regulating activity rather than a single narrowly defined receptor.
Mechanistic descriptions reflect published research-literature understanding and are quoted from each compound's own entry. Much peptide research is preclinical (in-vitro or animal-model); mechanism in humans may differ and is not established for many compounds.
Where each one appears in the literature
The research contexts each entry documents. Listing a research area is not a claim of efficacy or a therapeutic indication, and the two lists are not scored against each other.
Epitalon
Thymosin Alpha-1
What sets each apart
Epitalon
Epitalon is a defined 4-amino-acid pineal bioregulator peptide, distinct from thymic peptides (immune focus) and mitochondrial peptides, with a research emphasis on telomere/telomerase biology.
Thymosin Alpha-1
Thymosin alpha-1 is a single, well-characterized synthetic peptide with genuine clinical trial data and approvals in some countries, unlike the research-only thymic fraction Thymalin.
Frequently asked questions
What is epitalon and what is it studied for?
Epitalon (epithalon) is a synthetic tetrapeptide, Ala-Glu-Asp-Gly, modeled on the pineal peptide epithalamin. It is studied in aging research for reported effects on telomerase activity, telomere length, circadian/melatonin regulation, and antioxidant markers, largely in older Russian experimental programs and cell/animal models.
What is the sequence and molecular weight of epitalon?
Epitalon is the tetrapeptide Ala-Glu-Asp-Gly (AEDG), with molecular formula C14H22N4O9 and a molecular weight of about 390.35 g/mol. Its short four-residue length is one reason it is thought to have a very brief systemic half-life.
How is epitalon cycled in research protocols?
Reported research and community protocols use short cycles rather than continuous dosing, commonly a 10-20 day course repeated once or twice per year. Cycling reflects the older Russian research design of intermittent short courses rather than daily long-term administration.
What is thymosin alpha-1?
Thymosin alpha-1 (Ta1, thymalfasin, brand Zadaxin) is an acetylated 28-amino-acid thymic peptide that acts as an immunomodulator. It is studied for enhancing T-cell maturation and dendritic-cell function, in part through Toll-like receptor signaling (TLR9/TLR2).
What is the sequence and molecular weight of thymosin alpha-1?
Its sequence is Ac-SDAAVDTSSEITTKDLKEKKEVVEEAEN, a 28-residue N-acetylated peptide with a molecular weight of about 3108 Da. The N-terminal acetylation is a defining structural feature of the native molecule.
Is thymosin alpha-1 an approved drug?
Thymosin alpha-1 is approved as Zadaxin (thymalfasin) in more than 30 countries, chiefly for chronic hepatitis B and as an immune adjunct, but it is not FDA-approved in the United States. This makes it a research chemical in the US context.
Answers are the ones published on each compound's own PeptiDex entry. They are educational summaries of research-literature context and are not medical advice.