Thymalin

Overview

Thymalin is a heterogeneous polypeptide extract from calf thymus (a mixture, not a single defined peptide) developed in the 1970s by V. Kh. Khavinson and V. G. Morozov at the Military Medical Academy / St. Petersburg Institute of Bioregulation and Gerontology. Registered as a pharmaceutical in the USSR/Russia for immunocorrection. Distinct from Thymulin (Bach's zinc-dependent nonapeptide pGlu-Ala-Lys-Ser-Gln-Gly-Gly-Ser-Asn, originally called FTS) and from Thymosin alpha-1 (a 28-amino-acid synthetic peptide). Not FDA-approved in the US; research-use only.

Mechanism of Action

Claimed to restore T-lymphocyte subset differentiation and modulate cytokine and neutrophil function. Short peptide fragments from the extract (notably Glu-Trp and Lys-Glu) are proposed to enter cells and influence gene expression. Mechanistic data come almost entirely from the Khavinson group and have not been independently replicated in Western pharmacology literature.

Research Summary

Evidence base is almost entirely single-lab (Khavinson/Morozov, St. Petersburg). Long-term observational work in elderly Russian cohorts reported reduced all-cause mortality and lower incidence of respiratory infections with Thymalin (alone or with Epithalamin) over 6–8 years, but these were not blinded Western RCTs and have not been independently reproduced. No FDA-registered clinical trials.

Vendors selling Thymalin

Scored vendors carrying Thymalin, ranked by trust grade. Grades are computed from indexed Certificates of Analysis. Full $/mg pricing is on the comparison page.

Prescribers who offer Thymalin

3 prescribers in our directory work with Thymalin, each confirmed from their own website. Peptides like Thymalin require a prescription from a licensed provider.

Reported Side Effects

• Injection site reactions
• Rare allergic / hypersensitivity reactions (bovine-derived extract)

Compare Thymalin with Others

Research References

• Khavinson & Morozov — Peptides of pineal gland and thymus prolong human life (Neuro Endocrinol Lett) (2003)
• Khavinson & Morozov — Geroprotective effect of thymalin and epithalamin (Adv Gerontol, Russian) (2002)
• Khavinson et al. — The Use of Thymalin for Immunocorrection and Molecular Aspects of Biological Activity (Biol Bull Rev) (2021)
• Khavinson, Kuznik, Ryzhak — Peptide bioregulators: clinical studies results (Adv Gerontol, Russian) (2013)

Frequently asked questions

Has Thymalin been independently lab-tested?

Disclosed Labs has collected 14 Certificates of Analysis (COA) for Thymalin from 6 independent testing labs. 9 vendors have submitted material for testing. Products average 99.5% tested purity across the corpus. Full testing data is available at https://www.disclosedlabs.com/peptides/thymalin/testing.

What is the average purity of Thymalin on the market?

Based on 14 COAs analyzed by Disclosed Labs, Thymalin products average 99.5% (±0.4%) tested purity. Individual vendor results vary; see per-vendor COA data at https://www.disclosedlabs.com/peptides/thymalin/coas.

Where can researchers source Thymalin?

6 vendors with Disclosed Labs trust grades currently list Thymalin, including Ion Peptide, Peptidology, Real Peptides. Compare live prices and lab-verified COAs at https://www.disclosedlabs.com/prices/thymalin.

Which prescribers offer Thymalin with a prescription?

3 prescribers in the Disclosed Labs directory work with Thymalin, each confirmed from their own website. Thymalin requires a prescription from a licensed provider. Browse them at https://www.disclosedlabs.com/prescribers?peptide=Thymalin.

How does Thymalin work?

Claimed to restore T-lymphocyte subset differentiation and modulate cytokine and neutrophil function. Short peptide fragments from the extract (notably Glu-Trp and Lys-Glu) are proposed to enter cells and influence gene expression. Mechanistic data come almost entirely from the Khavinson group and have not been independently replicated in Western pharmacology literature.

What does the research say about Thymalin?

Evidence base is almost entirely single-lab (Khavinson/Morozov, St. Petersburg). Long-term observational work in elderly Russian cohorts reported reduced all-cause mortality and lower incidence of respiratory infections with Thymalin (alone or with Epithalamin) over 6–8 years, but these were not blinded Western RCTs and have not been independently reproduced. No FDA-registered clinical trials.