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Tuftsin
Overview
Tuftsin is a naturally occurring tetrapeptide (Thr-Lys-Pro-Arg) cleaved from the Fc portion of the heavy chain of immunoglobulin G. It binds to specific receptors on phagocytes, enhancing chemotaxis, phagocytosis, and microbicidal activity.
Mechanism of Action
The therapeutic rationale is to augment innate immune responses in immunocompromised states or chronic infections.
Research Summary & Key Findings
Clinical studies in the 1980s and 1990s evaluated tuftsin and synthetic analogs in cancer, infections, and immune deficiency with modest benefit observed in small cohorts. No large-scale pivotal trials or regulatory approvals have been achieved, and the peptide remains investigational.
Clinical Status
Tuftsin 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: "Tuftsin"
Peer-reviewed literature indexed by the National Library of Medicine.
- ClinicalTrials.gov: "Tuftsin"
Registered interventional and observational studies, including status and phase.
- PubChem: "Tuftsin"
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
Tuftsin 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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One email, only if this compound's regulatory standing actually moves. Not a newsletter, not a sales sequence.
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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.