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Thymostimulin (TP-1)
Overview
Thymostimulin is a polypeptide extract derived from bovine thymus tissue containing multiple biologically active thymic peptides. It acts on T-lymphocyte maturation and differentiation by mimicking thymic hormone activity.
Mechanism of Action
The therapeutic rationale centers on restoring or augmenting immune function in states of T-cell deficiency or immunosuppression.
Research Summary & Key Findings
Clinical investigations in the 1980s and 1990s explored thymostimulin in immunodeficiency states, chronic infections, and as an adjunct to cancer therapy, though results were inconsistent. Modern regulatory interest has diminished due to lack of standardized composition and robust efficacy data in controlled trials.
Clinical Status
Thymostimulin (TP-1) is in the investigational stage. While preclinical and early-phase data exist, it has not received regulatory approval for clinical use in the United States.
Administration Routes
References
Primary literature
- PubMed: "Thymostimulin"
Peer-reviewed literature indexed by the National Library of Medicine.
- ClinicalTrials.gov: "Thymostimulin"
Registered interventional and observational studies, including status and phase.
- PubChem: "Thymostimulin"
Chemical structure, molecular properties, and bioactivity data.
Study-level citations for this compound are being verified against the primary sources before publication. The database queries above return the current indexed literature in the meantime.
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View detailsNo lawful pathway today
Thymostimulin (TP-1) is not FDA-approved and does not currently have a lawful prescription or compounding pathway in the United States, so there is nothing for us to sell you here and no consultation to book. That can change: eight peptides moved back to a lawful pathway in February 2026.
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List Your PracticeDisclaimer: This information is provided for educational and research purposes only. It is not intended as medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before starting any peptide therapy. The Peptide Association does not endorse or recommend any specific treatment protocol. See our editorial policy for how this content is produced and reviewed.