What Is Thymosin Alpha-1?
Also known as: Tα1, Zadaxin
Thymosin Alpha-1 is a 28-amino-acid peptide originally isolated from the thymus gland, the immune system's training center. Unlike most compounds here, it is an approved pharmaceutical in over 35 countries under the name Zadaxin, used for hepatitis B/C and as an immune adjuvant.
It works as an immune modulator rather than stimulant — enhancing T-cell maturation and dendritic-cell function. It drew mainstream attention during COVID-19, when it was trialed for immune support in serious infection.
What is Thymosin Alpha-1 studied for?
- •Chronic viral hepatitis (approved indication abroad)
- •Immune support in immunocompromised states
- •Vaccine response enhancement
- •Sepsis and severe infection (trials)
- •Adjunct interest in oncology settings
Side effects & safety
The best-characterized safety profile on this site thanks to real clinical use: generally well tolerated, with injection-site reactions the main complaint. Autoimmune conditions warrant medical guidance, since immune amplification cuts both ways.
Legal & approval status
Approved abroad (Zadaxin); in the US it is not FDA-approved and moved into restricted compounding territory in 2023 — now largely research-vendor supplied.
Typical dosing at a glance
Related peptides
Educational overview based on published research and commonly reported community protocols — not medical advice, and not an endorsement of any compound. Consult a licensed healthcare provider.