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Peptides · Metabolic & longevity (under FDA review)
Thymosin Alpha-1 / Thymalin
Immunomodulatory thymic peptide.
What it does
What Thymosin Alpha-1 / Thymalin is and why doctors prescribe it.
Thymosin alpha-1 (Tα1) is a 28-amino-acid peptide derived from the thymic peptide thymosin fraction 5. It's approved in over 35 countries (under brand names like Zadaxin) for hepatitis B/C and other immune-related indications, but is not FDA-approved in the United States. Under FDA review for 503A access.
How it works
Mechanism in plain English.
Thymosin alpha-1 modulates innate and adaptive immunity through effects on dendritic cell maturation, T-cell activation, and Toll-like receptor signaling. The clinical applications in approved markets focus on chronic viral infections and immune support.
How long it's been studied
Research history.
Thymosin alpha-1 has been clinically studied since the 1970s. Trials in chronic hepatitis B/C, immune support during chemotherapy, and infectious disease have produced a substantial international evidence base. Cannot currently be compounded under 503A in the U.S.
Dosing
Clinical context for the prescribing doctor.
Pending regulatory clarity. International dosing protocols use 1.6–6.4 mg subcutaneously twice weekly for chronic indications, doctor-prescribed.
This page is informational, not a dispensing aid. Thymosin Alpha-1 / Thymalin is dispensed only on a patient-specific prescription written by a licensed doctor for an identified patient. Compounded drugs are not FDA-approved and should not be evaluated using branded-drug trial data. Availability varies by state and prescribed medication.
How to access Thymosin Alpha-1 / Thymalin through RonanRx
Three paths.
Thymosin Alpha-1 / Thymalin is currently in Category 2 and not available for 503A compounding. RonanRx is tracking the FDA review and will notify partner clinics when the decision allows compounding access.
Patient with a doctor
Sign up to receive your prescription.
If your doctor has already prescribed Thymosin Alpha-1 / Thymalin, sign up so we can prepare and ship your medication. The signup wizard collects intake and connects you to the prescribing workflow.
Patient without a doctor
Get referred by a partner clinic.
RonanRx prescribes through partner clinics — we don't initiate prescriptions on this site. Read how the referral process works and how to find a partner clinic in your state.