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Reference only · Not medical advice · For adults 18+ · No dosing information is published here
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Immune Support

Thymosin Alpha-1 — reference

Immune-modulating peptide (Zadaxin), approved in some countries for hepatitis B/C and as an immune adjunct.

Regulatory statusNot FDA-Approved
Published half-life~2 hours
Evidence levelPK study
CategoryImmune Support

Regulatory status

Not FDA-Approved. Not FDA-approved in the United States.

Reported cautions

⚠ Worth knowing. Immune modulation warrants caution in autoimmune disease and alongside immunosuppressive therapy. Not FDA-approved in the US, though approved in several other countries.

Pharmacokinetics

Published figures give an elimination half-life of ~2 hours. Studied clinically outside the US (e.g. as Zadaxin) with reasonable PK data.

This figure is tagged PK study in our evidence system. This figure comes from a published pharmacokinetic study rather than a label or registration trial. Sample sizes in such studies are often small and figures vary between them, so treat the number as a range rather than a constant. You can see the shape this implies between doses in the Half-Life Visualizer, and compare it against every other compound in the Half-Life Data Table. Our sourcing page explains what each tier means.

Remember that an estimated curve is a model built from a population figure, not a measurement of your blood. Individual clearance varies, and for depot injections the figure describes release from the injection site rather than the compound clearing. Half-life explained →

What Peptide Plug does and does not publish

This page carries regulatory status, general context and published pharmacokinetics. It carries no dose, frequency or cycle information — that is a deliberate editorial line, because dosing is a clinical decision rather than reference data. We also do not sell, supply, source or link to vendors for any compound.

Frequently asked

Is Thymosin Alpha-1 FDA-approved?
Not FDA-Approved. Not FDA-approved in the United States.
What is the half-life of Thymosin Alpha-1?
Published figures give ~2 hours. Studied clinically outside the US (e.g. as Zadaxin) with reasonable PK data.
How reliable is that half-life figure?
It is tagged “PK study” in our system. This figure comes from a published pharmacokinetic study rather than a label or registration trial. Sample sizes in such studies are often small and figures vary between them, so treat the number as a range rather than a constant.
What cautions are associated with Thymosin Alpha-1?
Immune modulation warrants caution in autoimmune disease and alongside immunosuppressive therapy. Not FDA-approved in the US, though approved in several other countries.
Does Peptide Plug publish dosing for Thymosin Alpha-1?
No. This library publishes regulatory status, general context and pharmacokinetics only. Dose, frequency and cycle information is deliberately absent from these public pages — those are clinical decisions, not reference data.
Does Peptide Plug sell Thymosin Alpha-1?
No. We do not sell, supply, source or link to vendors for any compound, and we have no affiliate arrangements with suppliers. Peptide Plug is a tracking and calculation tool.

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Pro Protocol Reference

The public research page intentionally does not publish dosing. Pro subscribers can open the separate Protocol Library for structured indication, frequency, duration, notes, and review-first Cycle Builder import when a matching reference is available.

View Protocol Reference
Reference information, not medical advice. This page describes regulatory status and published pharmacokinetics. It does not tell you whether to use this compound, how much to use, how often, or whether it is safe for you. Peptide Plug does not sell, supply or source any compound. Those decisions belong to you and a licensed clinician.

Part of the Peptide Plug research library · How we source our figures · All compounds A–Z