Library / Longevity

Thymalin

Also known as Thymus extract peptide complex

Largely unstudied

Peptide extract from calf thymus used in Russia as an immune modulating medicine. Published research is mostly from one research group, with few modern controlled trials.

Not an approved medicine. Thymalin is not an approved medicine for this use in Australia or the United States. This page summarises published research for information only. It is not a recommendation to use Thymalin, and VialOwl does not sell or supply it.

Background

Mixture of small peptides extracted from calf thymus, developed in the Soviet Union from the 1970s by Vladimir Khavinson and colleagues in Leningrad (now St Petersburg). It is used in Russia as an immune modulating medicine.

How it is thought to work

Said to restore immune function by encouraging immature immune cells to develop into mature T cells. Lab work from the same research group suggests short dipeptides in the mixture change gene expression, but this is not independently confirmed.

What is claimed, and the evidence

Claim	Evidence	Notes
Restores immune function in immune deficiency and infections	Small human studies	Russian clinical use and small studies, mostly from one research group; few modern controlled trials.
Extends lifespan and reduces death rates in older people	Small human studies	One non randomised Russian cohort of 266 older people reported lower mortality; the design cannot establish cause and effect and it has not been replicated independently.
Prevents or treats COVID-19	Animal studies only	Based on a cell study; no controlled clinical trial evidence found.
Improves Parkinson disease symptoms	Small human studies	Single uncontrolled study of 15 patients.
Anti ageing 'bioregulator' for general health	No published evidence	Widely marketed online; no independent controlled human evidence.

Side effects

Effect	How often	Notes
Side effects not systematically reported	Frequency unknown	Published studies give little adverse event data.
Allergic or immune reactions to animal derived proteins Serious	Frequency unknown	A plausible risk with any animal tissue extract; not quantified in published studies.
Infection risk from animal tissue or contaminated product Serious	Frequency unknown	Unregulated animal derived products may carry contamination risks.

Warnings

Evidence comes mainly from one Russian research group and has not been independently confirmed in controlled trials.
It is a calf tissue extract, so composition can vary between batches and sources.
Unapproved products are not made to medicine standards and may be contaminated, underdosed, overdosed or contain a different substance from the label; the TGA warns that injected unapproved peptides carry risks including contamination, infection and local tissue damage.

Regulatory status

Australia: Not included on the ARTG (unapproved). Not specifically listed in the Poisons Standard (June 2026).
United States: Not FDA approved.

Sources

Also in Longevity

From the VialOwl library, reviewed 26 September 2026. For education and general information. It is not medical advice and not a recommendation to use Thymalin.