Not FDA approved and sold as a research chemical. This page is educational information only. It is not medical advice and not a recommendation to use anything.

IndexedBuilt automatically from public databases on 2026-09-30. Not yet hand-reviewed by PLOBT.How this works →

Thymalin

Not FDA approved

Thymic peptide extract

Also known as: thymalin peptide, Nonathymulin, Thymic factor, nonathymuline, nonatimulina, Thymulin (pig peptide moiety), Thymulin Acetate?, Thymulin, lyophilized powder

Evidence score

34/ 100

Emerging evidence

Early evidence, mostly unproven in humans

Regulatory standing. Sold as a research chemical, not approved
Limited human data. Some human data exists, not conclusive
No registered human trials. Nothing registered on ClinicalTrials.gov
1 cited source. Includes primary / regulatory sources

Computed with the same four public criteria as every profile. The human-evidence grade on an indexed profile is set automatically and may change when it is hand-reviewed. It is not a safety score, not a purity rating, and not medical advice, and not a claim that this compound treats, cures, or prevents any condition.

What it is

Thymalin is a peptide preparation originally derived from calf thymus tissue, developed in the Soviet Union and later Russia. It is thought to act on the immune system, particularly on T-cell maturation and function, in a way similar to other thymic hormone preparations.

What the evidence shows

Automatic summaryLimited human data

Thymalin is not FDA-approved and has no registered human trials in major trial databases. The roughly 243 published papers are largely Russian-language studies, and while some report human use, they are mostly small or older studies whose quality is difficult to assess, so benefits in humans are not well established.

Key facts

Molecular formula

C33H54N12O15

Molecular weight

858.9 g/mol

Registered human trials

Live from ClinicalTrials.gov, refreshed daily.

0registered studies

Nonemost advanced phase

0completed (sample)

0recruiting (sample)

Published literature

Live from Europe PMC. This is how much has been published, not how much is proven in humans.

243papers referencing Thymalin

Natural and synthetic thymic peptides as therapeutics for immune dysfunction.

Int J Immunopharmacol1997

Immunomodulatory synthetic dipeptide L-Glu-L-Trp slows down aging and inhibits spontaneous carcinogenesis in rats.

Biogerontology2000

Peptides Regulating Proliferative Activity and Inflammatory Pathways in the Monocyte/Macrophage THP-1 Cell Line.

Int J Mol Sci2022

Peptides and Ageing.

Neuro Endocrinol Lett2002

Sources

Risks, side effects and study doses are only published on hand-reviewed profiles. Want this one reviewed, or spotted something wrong? Tell us.