Epitalon vs Thymalin

Side by side

Epitalon Low and thymalin Low are both sold as 'bioregulators', a term from the Russian research programme that developed them ¹. The table is read from our encyclopedia entries.

Thymalin: a Russian thymus preparation

Thymalin is approved in Russia; it is not approved in the US, where Drugs@FDA holds no application ¹. Its most striking report concerns severe COVID-19: among middle-aged and elderly patients, hospital mortality was 40.9% with standard care, 28.4% with tocilizumab and 20.6% with thymalin, and thymalin doubled lymphocyte and monocyte counts (human study) ². The groups were compared as treated, and a report like this needs a randomised trial before its mortality figures can be trusted.

Its other human studies are small and uncontrolled: in 15 people with early parkinsonism the authors reported improvement without a control group (human study) ³, and in 36 psychiatric patients with immune abnormalities they reported better responses when it was added to drugs (human study) ⁴. In rats with transplanted sarcoma it slowed or reversed tumour growth (animal study) ⁵.

Epitalon: cells and mice

Epitalon is a synthetic tetrapeptide (AEDG). In cultured human fetal fibroblasts it induced telomerase and telomere elongation (laboratory study) ⁶. In 54 female mice given monthly courses for life, average lifespan did not change (animal study) ⁷. The long human study often cited for it used epithalamin, a pineal extract (human study) ⁸. Our entry notes that independent replication of this group's work is limited ¹.

What they share

Both come from a research programme that has produced many peptides and reports, mostly published by the same group and often in Russian journals. That concentration is the main reason both carry low evidence grades in our encyclopedia: positive results that have not been reproduced by independent groups, in controlled trials, are not enough to judge benefit or safety. Thymalin's Russian approval reflects that country's regulator, not a trial standard recognised by FDA or EMA.

Questions to ask before choosing either

• Was the study randomised and controlled, or a comparison of groups as treated, like the thymalin COVID-19 report ²?
• Was it published by the developing group, or reproduced independently?
• Is the product the Russian pharmaceutical or a research powder sold under the same name?
• For epitalon, does the claim concern synthetic epitalon or the pineal extract ⁸?
• Am I subject to anti-doping testing ¹?

How the differences add up (as of October 3, 2026)

Thymalin has an approval in Russia and a handful of human reports, the most notable uncontrolled; epitalon has cell results and a null mouse lifespan finding. Neither is approved in the US, EU, UK, Canada or Australia. For athletes, epitalon falls under S0 by inference, while thymalin's status is unsettled because of its Russian approval ¹. Our DSIP vs epitalon page covers epitalon from another angle. Doses on this page are those in our entries' sources, not recommendations.

Frequently asked questions

What is the difference between epitalon and thymalin?

Thymalin is a thymus-derived preparation approved in Russia; epitalon is a synthetic tetrapeptide that is not approved anywhere. Both come from the same St. Petersburg research programme.

Did thymalin reduce COVID-19 deaths?

One report found 20.6% hospital mortality with thymalin against 40.9% with standard care, but the groups were not described as randomised, so the result needs confirmation.

Are epitalon and thymalin approved in the US?

No. Thymalin is approved only in Russia; epitalon is not approved anywhere.

Related on Grey Peptides

• Epitalon
• Thymalin
• DSIP vs Epitalon

Sources

1. Grey Peptides dataset records for epithalon and thymalin (FDA status; thymalin approved in Russia; WADA status as recorded; studied doses as sourced on each entry); read October 3, 2026.
2. Kuznik, B. I., et al. (2022). [Morphological compound and indicators of the blood clotting system in severe COVID-19 patients of middle aged and elderly during treatment of Tocilizumab and Thymalin.]. Adv Gerontol, 35(3), 368-374. PMID: 36169363
3. Musienko, G. V. (1999). [Thymalin in the combined treatment of parkinsonism patients]. Lik Sprava, (1), 119-22. PMID: 10424021
4. Govorin, N. V., et al. (1990). [Use of thymic peptide thymalin in the complex treatment of therapy-resistant schizophrenia]. Zh Nevropatol Psikhiatr Im S S Korsakova, 90(3), 100-3. PMID: 2163147
5. Zhukova, G. V., et al. (2018). Effect of Thymalin on the Tumor and Thymus under Conditions of Activation Therapy In Vivo. Bull Exp Biol Med, 165(1), 80-83. PMID: 29797130
6. Khavinson, V. K. h., et al. (2003). Epithalon peptide induces telomerase activity and telomere elongation in human somatic cells. Bull Exp Biol Med, 135(6), 590-2. PMID: 12937682
7. Anisimov, V. N., et al. (2003). Effect of Epitalon on biomarkers of aging, life span and spontaneous tumor incidence in female Swiss-derived SHR mice. Biogerontology, 4(4), 193-202. PMID: 14501183
8. Korkushko, O. V., et al. (2006). Geroprotective effect of epithalamine (pineal gland peptide preparation) in elderly subjects with accelerated aging. Bull Exp Biol Med, 142(3), 356-9. PMID: 17426848

Educational information, not medical advice. Each dose in this guide names its source, an approved label or a published study. None is a recommendation for you. An unapproved compound has no established safe or effective human dose, and products sold for “research use only” are not made or tested for people. Talk to a doctor before acting on anything on this site, including before you start, stop or change any medicine or dose.