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Immune

Thymosin Alpha-1

A synthetic peptide derived from thymosin that modulates immune function and has been studied for enhancing T-cell activity.

Human Trials

15

1,200 participants

Risk Level

Medium Risk

Monthly Cost

$300$800 /month

Prescription required in most jurisdictions; costs vary significantly by source and dosing protocol

Quick Facts

Category
Pharmaceutical
Research Field
Immunology
Evidence Grade
B- – Promising
Risk Level
Medium
Monthly Cost
$300 – $800
Human Trials
15

Typical Dose

1.6 mg subcutaneously, 2x/week

Range

0.8–6.4 mg/week depending on protocol

Timing2–3x/week subcutaneous injection; same days each week
Formsubcutaneous injection (compounded peptide – Zadaxin/TA1)
NotesPrescription / compounded peptide. Thymic peptide that modulates immune function and T-cell activity. Used in HIV, hepatitis, and cancer immunotherapy contexts. Longevity use is extrapolated from immune-aging research. Store refrigerated.

For informational purposes only – not medical advice. See disclaimer

Research Velocity

Emerging Field
8 publications in the last 12 months · limited publications – early-stage research

Mechanism of Action

Thymosin Alpha-1 is a synthetic version of a naturally occurring peptide that modulates immune system function by enhancing T-lymphocyte maturation and activation. Research indicates it works by stimulating the production of interleukin-2 and interferon-gamma, while also promoting the differentiation of T-helper cells. Studies suggest it may help restore immune balance in both immunocompromised and autoimmune conditions by regulating cytokine production and enhancing natural killer cell activity.

Overview

Thymosin Alpha-1 is a synthetic 28-amino acid peptide that research indicates may help optimize immune system function through multiple pathways. Originally derived from thymosin fraction 5, a hormone produced by the thymus gland, this peptide has been studied extensively for its ability to enhance T-cell function and promote immune balance. Clinical trials have primarily focused on its use in hepatitis B, certain cancers, and immunocompromised states, with studies suggesting potential benefits for immune system restoration and enhanced vaccine responses.

Research indicates that Thymosin Alpha-1 works by stimulating the maturation of T-lymphocytes and enhancing the production of key immune signaling molecules like interleukin-2 and interferon-gamma. Studies suggest it may help restore immune function in aging individuals and those with compromised immunity, while potentially modulating autoimmune responses. The peptide is typically administered via subcutaneous injection, with clinical protocols varying from twice weekly to daily dosing depending on the condition being addressed.

While human trial data shows promising results for specific medical applications, most research has focused on therapeutic rather than preventive or longevity applications. The peptide requires prescription access in most countries and should only be used under medical supervision due to its potent immunomodulatory effects. Side effects reported in clinical trials are generally mild but can include injection site reactions and occasional flu-like symptoms as the immune system responds to treatment.

Known Interactions

  • May enhance effects of immunosuppressive medications requiring dosage adjustments
  • Potential interactions with live vaccines due to immune modulation
  • May affect blood glucose levels in diabetic patients
  • Caution advised with autoimmune medications due to immune system activation

Legal Status by Country

📍

Your country (United States)

Not FDA approved for general use; available through compounding pharmacies with prescription

Restricted
✈️

Available without prescription in:

Panama

✈️Panama
Unregulated
✈️Brazil
Rx Required
China
Rx Required
✈️Colombia
Rx Required
✈️India
Rx Required
✈️Israel
Rx Required
✈️Mexico
Rx Required
Netherlands
Rx Required
Russia
Rx Required
✈️South Korea
Rx Required
Switzerland
Rx Required
✈️Thailand
Rx Required
✈️Turkey
Rx Required
✈️UAE
Rx Required
Germany
Varies
Australia
Restricted
Canada
Restricted
Japan
Restricted
United Kingdom
Restricted
📍United States
Restricted

📍 = your selected country · ✈️ = medical tourism destination · Always verify current local regulations before travel.

Key Research

Where to Source·Prescription required – consult your healthcare provider

Last verified: 2026-03-17