Thymalin
Thymalin is one of the original 'peptide bioregulators' associated with the Russian researcher Vladimir Khavinson. It has been used in Russia and some former-Soviet states to modulate immunity, and small, largely Russian-language studies have explored effects on immune function and ageing. High-quality, independently replicated trials are lacking, and it is an unapproved substance outside those markets.
Mechanism
Thymalin is a mixture of thymic polypeptides proposed to help restore balance to the immune system by supporting T-lymphocyte maturation and differentiation and normalising T-helper/T-suppressor ratios. As an extract rather than a single defined molecule, its precise active constituents and molecular targets are not fully characterised, and most mechanistic claims derive from older preclinical and Russian clinical work that has not been independently verified in large Western trials.
Regulatory Status by Region
- United States (FDA)Not FDA-approved; no US marketing approval and not an approved medicine.
- Russia and former-Soviet statesRegistered and used clinically in Russia (and some neighbouring states) as an immunomodulatory thymic preparation; not evaluated or approved by the FDA, EMA or TGA.
- Australia (TGA)Not on the ARTG; an unapproved substance in Australia.
- European Union (EMA)No EMA marketing authorisation; not an approved medicine in the EU.
- WADANot listed by name on the Prohibited List; its status as a peptide immunomodulator is not clearly defined for anti-doping purposes, and athletes should verify current status with their anti-doping organisation.
Key Studies
- Peptides of pineal gland and thymus prolong human life (Khavinson et al.) (opens in a new tab) (Neuro Endocrinol Lett 2003;24(3-4):233-240; PMID 14523363)
- Peptide Drug Thymalin Regulates Immune Status in Severe COVID-19 Older Patients (Kuznik et al.) (opens in a new tab) (Adv Gerontol 2021;11(4):368-376; DOI 10.1134/S2079057021040068; PMCID PMC8654498)
Common Questions
- What is Thymalin?
- Thymalin is a polypeptide preparation extracted from calf thymus, developed in the former Soviet Union and used in Russia as an immunomodulator. It is not approved by the US FDA, the EMA or Australia's TGA, and modern, independently replicated controlled-trial evidence is very limited.
- Is Thymalin approved for medical use?
- Thymalin does not have a settled approval status and is not an approved medicine for general clinical use. United States (FDA): Not FDA-approved; no US marketing approval and not an approved medicine. European Union (EMA): No EMA marketing authorisation; not an approved medicine in the EU. Australia (TGA): Not on the ARTG; an unapproved substance in Australia.
- How does Thymalin work?
- Thymalin is a mixture of thymic polypeptides proposed to help restore balance to the immune system by supporting T-lymphocyte maturation and differentiation and normalising T-helper/T-suppressor ratios. As an extract rather than a single defined molecule, its precise active constituents and molecular targets are not fully characterised, and most mechanistic claims derive from older preclinical and Russian clinical work that has not been independently verified in large Western trials.
- Is Thymalin legal in Australia?
- Thymalin in Australia (TGA): Not on the ARTG; an unapproved substance in Australia.
- Is Thymalin banned in sport?
- Thymalin under the World Anti-Doping Agency (WADA) code: Not listed by name on the Prohibited List; its status as a peptide immunomodulator is not clearly defined for anti-doping purposes, and athletes should verify current status with their anti-doping organisation.