Thymosin Alpha-1

What Thymosin Alpha-1 has been studied for

The reasons people look it up, roughly in order of how often, and what research exists for each. Interest in a use is not evidence that it works; the evidence is stated under each one.

Immune function

The main reason people look it up. In laboratory and clinical research it helps T-cells mature and affects how the immune system recognises threats. Outside its licensed indications, the evidence is limited.

Hepatitis B and C

Its licensed use in the countries where it is approved, mainly chronic hepatitis B, usually alongside other treatment.

Ageing immune function

The thymus shrinks with age, and so does the body's supply of this peptide. The idea that replacing it helps is reasoning rather than proof.

Mechanism of Action

How Thymosin Alpha-1 works

Thymosin Alpha-1 side effects: what studies reported

Unusually well tolerated for something with real clinical use behind it. Most trials report side effects close to placebo.

Source: Clinical trials in hepatitis plus prescribing experience where it is approved. This is a summary of published findings, not a complete safety profile and not medical advice. Questions about Thymosin Alpha-1 belong with a licensed clinician who knows your history.

The dots after each gene are where your own result goes. Your report fills them in with the two letters you carry at that position.

Often discussed alongside

Compounds that come up next to Thymosin Alpha-1 in research and discussion. Each has its own page. None of this is a suggestion to combine them.

LL-37

also studied for immune functionPreliminary Evidence

LL-37 (Human Cathelicidin Antimicrobial Peptide)

The body's own broad-spectrum antimicrobial peptide: the active fragment of human cathelicidin (the CAMP gene), part of innate immune defence against bacteria, viruses and biofilms. The body makes it in a vitamin-D-dependent way, through the vitamin D receptor. Injected LL-37 is experimental, with thin human safety data, and it is not an approved medicine.

3

Gene variants

30+

Studies

KPV

also studied for inflammationEmerging Evidence

KPV (Lys-Pro-Val)

A three-amino-acid fragment snipped off the end of a hormone your body already makes. Almost every page describes it as switching on a melanocortin receptor; the research fairly clearly says it does not. What it appears to do instead is more interesting, and it is why nearly all the data are about the gut rather than skin. No human study of KPV has been published.

4

Gene variants

15+

Studies

Access

Access and legal status

Thymosin Alpha-1: Licensed abroad (Zadaxin); not approved in the US. Decisions about any prescription medicine belong to a prescriber. We don't link to any seller, and nothing on this page is a recommendation to obtain or use it.

Educational information only, not medical advice. Most peptides are not FDA-approved. Do not start, stop or change any medication or peptide because of this page; talk to a licensed clinician.

Worth knowing about Thymosin Alpha-1

Interactions and situations where there is a specific reason to be careful. Where the honest answer is that nobody has studied something, it says so and says what that leaves open.

Autoimmune conditions are the real caution

A compound that helps the immune system respond more sharply carries a specific risk where the immune system is already attacking the body.

Approved somewhere is not approved everywhere

It is a licensed medicine in dozens of countries and not in the US, where products sold under the name are not approved drugs.

Frequently Asked Questions