Peptide Medicine
Thymosin Alpha-1: Immune Support, Evidence, and Safety
Medically reviewed by HealthRX.com Medical Team · Last reviewed
What is thymosin alpha-1?
Thymosin alpha-1 is a peptide originally derived from the thymus gland, which trains the immune system. A synthetic version is used as an immune modulator and is sold in many countries as Zadaxin.
How does thymosin alpha-1 work?
Thymosin alpha-1 helps mature and regulate T cells, a central part of the immune system, and can influence the balance of immune signaling. This is why it has been studied as an add-on in infections and as a vaccine adjuvant. [1]
What does the research show?
Thymosin alpha-1 is approved and used in many countries for hepatitis B and C and as an immune adjuvant, and it has been studied in sepsis and other conditions. Evidence quality varies by indication, and it is not FDA approved in the United States. [1]
How is thymosin alpha-1 dosed?
Where approved, thymosin alpha-1 is given as a subcutaneous injection, often twice weekly, with the dose set by the treating clinician and indication. Compounded or off-label regimens vary and should be provider-directed.
Is thymosin alpha-1 safe?
Thymosin alpha-1 is generally well tolerated where it is used clinically, with injection-site reactions the most common complaint. As an immune modulator, it should be used under medical supervision, particularly in people with autoimmune conditions.
Is thymosin alpha-1 legal and FDA approved?
Thymosin alpha-1 is approved in many countries but is not FDA approved in the United States, where the FDA has restricted its use in compounding. Any use should be discussed with a licensed clinician.
How to get Thymosin Alpha-1 online
Thymosin Alpha-1 is available through HealthRX after an online visit with a licensed provider, who reviews your history and, when appropriate, issues a prescription that a licensed US pharmacy dispenses and ships to you. Thymosin Alpha-1 starts at $224 per 5mg vial.
Because Thymosin Alpha-1 is a immune-modulating peptide and prescription-only, it cannot be bought over the counter. What you pay depends on the dose and quantity your provider recommends. You can begin the online visit in a few minutes and are only prescribed if a provider determines it is appropriate.
Is Thymosin Alpha-1 right for you?
Thymosin alpha-1 is used to support immune function and has been studied in infection and immune contexts, with a version used clinically in some countries. Your provider will explain where the evidence applies to your situation. It is prescription-only in compounded form.
What to expect from an online Thymosin Alpha-1 visit
You complete a short online intake, and a licensed provider reviews your history and decides whether thymosin alpha-1 is appropriate. If it is, a licensed US pharmacy prepares and ships it with instructions. You are only charged for the medication if you are prescribed.
Thymosin alpha-1 is priced per vial rather than through insurance, with lower per-vial pricing at larger quantities.
Frequently asked questions
Is thymosin alpha-1 FDA approved?
No. It is approved in many countries as Zadaxin but is not FDA approved in the United States, and the FDA has restricted its use in compounding.
What is thymosin alpha-1 used for?
Abroad it is used for hepatitis B and C and as an immune adjuvant, and it has been studied in other conditions such as sepsis.
Is thymosin alpha-1 safe?
It is generally well tolerated where used clinically, with injection-site reactions most common. People with autoimmune conditions should be especially cautious.
Citations
This guide is educational and is not a substitute for individualized medical advice. Thymosin Alpha-1 is prescription-only and requires evaluation by a licensed provider.