Compound Library

Peptide / Immune

Thymosin Alpha-1 (Tα1)

28-amino acid thymic peptide. FDA-approved (Zadaxin) in many countries for hepatitis B, hepatitis C and immunodeficiency. Potent T-cell and NK cell upregulator. Used in oncology, chronic infections, and post-COVID recovery.

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Educational reference only. This page does not diagnose, prescribe, or replace care from a licensed professional. Laws, availability, and clinical appropriateness vary by location.
Reference dose1.6 mg SubQ 2x/week
Half-life2 hours
Risk flaglow
Regulatory noteFDA-approved context noted

Side effects and watch-outs

  • Injection site reaction
  • Fatigue (immune activation — first 1–2 weeks)
  • Mild fever on initiation
  • Rare: autoimmune flare in predisposed individuals
  • Do not use in organ transplant recipients without physician oversight