Thymosin Alpha-1
Also known as: TA1, Tα1, Thymalfasin, Zadaxin
Thymosin Alpha-1 is a peptide naturally produced by the thymus gland that plays a central role in immune function. It modulates the immune system, enhances T-cell function, and has been used as an adjuvant therapy for various conditions including hepatitis and cancer.
Research Status
Approved in some countries (not FDA approved in US)
For research purposes only. Not approved for human use. Not medical advice.
Research Areas
Side Effects
Mild redness, warmth, or slight swelling at the injection site typically resolves within 1-2 hours. Rotate injection sites to minimize recurrence. Apply ice if needed for comfort.
Low-grade fever (99-100.5°F) may occur within 2-6 hours of injection as the immune system activates. This is typically self-resolving and indicates immune engagement. Acetaminophen or ibuprofen may be used if uncomfortable.
Mild tiredness may occur in the first 24 hours after injection, particularly in the first few doses. This typically diminishes with continued use as the body adapts.
Mild headache may occur within hours of injection. Ensure adequate hydration and rest. Over-the-counter analgesics are appropriate if needed.
Mild nausea is uncommon but may occur, particularly if injected on an empty stomach. Taking the injection with food may help.
Mild myalgia or arthralgias may occur as part of the immune activation response. These typically resolve within 24-48 hours.
Severe allergic reactions (anaphylaxis) are extremely rare but possible. Symptoms include difficulty breathing, facial swelling, severe rash, or throat tightness. Seek immediate medical attention if these occur. Have an epinephrine auto-injector available if you have a history of peptide allergies.
In individuals with pre-existing autoimmune conditions, immune activation may theoretically exacerbate symptoms. Consult with a healthcare provider before use if you have lupus, rheumatoid arthritis, or other autoimmune diseases.
Dosing Reference
| Parameter | Value |
|---|---|
| Dose range | 0.8-3.2 mg |
| Frequency | 2-3x per week |
| Timing | Flexible - morning or evening |
| Route | Subcutaneous |
Can be used long-term. Commonly dosed at 1.6mg twice weekly. Well-tolerated.
Research disclaimer
Figures drawn from published research literature and community logs. Not clinical recommendations. Consult a qualified professional. Research use only.
Reconstitution Guide
Do not use saline or bacteriostatic saline — use only bacteriostatic water for reconstitution
Do not shake the vial vigorously; gentle swirling prevents peptide degradation
Discard immediately if the solution appears cloudy, discolored, or contains visible particles
Use within 30 days of reconstitution when stored at 2–8°C
Do not freeze the reconstituted solution; freezing may denature the peptide
Use the PeptideVolt reconstitution calculator for your exact concentration
Molecular and Pharmacological Data
| Molecular weight | 3108 Da |
| Half-life | Approximately 30-60 minutes in circulation; tissue retention extends biological activity |
| Sequence | SDAEFRHDSGYEQYESRAGCYSSN |
Thymosin Alpha-1 is a naturally occurring peptide that enhances immune function by promoting T-cell maturation and differentiation in the thymus gland, while also activating dendritic cells and macrophages to improve antigen presentation. It acts as an immunomodulator that restores and optimizes both cellular and humoral immune responses, making it particularly useful in conditions where immune function is compromised or dysregulated.
T-cell Maturation and Differentiation
Thymosin Alpha-1 promotes the development of naive T-cells into mature effector T-cells and regulatory T-cells (Tregs) within the thymus. This enhances the body's ability to recognize and respond to pathogens and abnormal cells.
Dendritic Cell Activation
The peptide enhances dendritic cell function, improving their capacity to process antigens and present them to T-cells, thereby strengthening the adaptive immune response.
Macrophage Activation
Thymosin Alpha-1 stimulates macrophage activity, enhancing their phagocytic capacity and cytokine production, which supports both innate and adaptive immunity.
Th1/Th2 Balance
The peptide helps restore balance between Th1 (cell-mediated) and Th2 (humoral) immune responses, which is critical in conditions with immune dysregulation.
- Thymosin Alpha-1 is endogenously produced by the thymus gland and naturally declines with age
- It has been studied extensively in hepatitis B and C, cancer immunotherapy, and immunodeficiency conditions
- The peptide works synergistically with other immune modulators and can enhance vaccine responses
- Unlike immunosuppressants, Thymosin Alpha-1 restores immune function rather than suppressing it
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View all peptidesResearch Use Only. All content on this page is provided for informational and educational purposes related to scientific research. Thymosin Alpha-1 is not approved for human use by the FDA or any equivalent regulatory body. This is not medical advice. Do not use any substance discussed here for therapeutic, diagnostic, or preventative purposes. Consult a qualified healthcare professional before making any health-related decisions. The Peptide Volt does not endorse the use of any research chemicals. 18+ only.