Thymosin Alpha 1
Thymosin Alpha 1 is a small protein fragment your body naturally makes in an organ called the thymus gland, which sits behind your breastbone. Think of your thymus as an immune training academy—it's where your immune cells learn to do their job properly. This peptide is essentially a coach that helps that academy run better. People use it to strengthen their immune response, especially when fighting viral infections like hepatitis or when they need their body to respond better to vaccines.
Here's how it works: when you inject thymosin alpha 1, it essentially tells your immune system to get into better shape. It trains your T-cells—those are your body's special forces soldiers—to mature and recognize threats more effectively. It also wakes up your natural killer cells, which hunt down infected or damaged cells before they become problems. At the same time, it balances things out so your immune system doesn't overreact and cause inflammation. It's like having a better-organized security team that catches problems faster without causing unnecessary chaos. The peptide also makes your body respond more powerfully to vaccines, essentially amplifying your immune memory so you stay protected longer.
Dosage Information
Typical Dose
1.6 mg
Frequency
2 times per week
Administration
Subcutaneous injection
Half-Life
2 hours
Notes
Standard dosing is 1.6mg twice weekly. Can be used continuously or in cycles. Approved dosing in hepatitis treatment is 1.6mg twice weekly for 6-12 months. Well-tolerated with an excellent safety profile over decades of clinical use.
Why this matters
Short half-life but immunomodulatory effects persist 24+ hours; twice-weekly dosing is typical.
Protocol cycle
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Evidence Score
0.76
Compound Data
Molecular Formula
C129H215N33O55
Molecular Weight
3108.30 g/mol
IUPAC Name
(4S)-4-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S,3R)-2-[[(2S,3R)-2-[[(2S,3S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S,3R)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-acetamido-3-hydroxypropanoyl]amino]-3-carboxypropanoyl]amino]propanoyl]amino]propanoyl]amino]-3-methylbutanoyl]amino]-3-carboxypropanoyl]amino]-3-hydroxybutanoyl]amino]-3-hydroxypropanoyl]amino]-3-hydroxypropanoyl]amino]-4-carboxybutanoyl]amino]-3-methylpentanoyl]amino]-3-hydroxybutanoyl]amino]-3-hydroxybutanoyl]amino]-6-aminohexanoyl]amino]-3-carboxypropanoyl]amino]-4-methylpentanoyl]amino]-6-aminohexanoyl]amino]-4-carboxybutanoyl]amino]-6-aminohexanoyl]amino]-6-aminohexanoyl]amino]-4-carboxybutanoyl]amino]-3-methylbutanoyl]amino]-3-methylbutanoyl]amino]-4-carboxybutanoyl]amino]-4-carboxybutanoyl]amino]propanoyl]amino]-5-[[(1S)-3-amino-1-carboxy-3-oxopropyl]amino]-5-oxopentanoic acid
PubChem CID
16130571Potential Side Effects
Thymosin Alpha 1 discussions
Stacking Compatibility
Quick Facts
- Administration
- Subcutaneous injection
- Typical Dose
- 1.6 mg
- Frequency
- 2 times per week
- References
- 2 curated + 47 from PubMed
- Clinical Trials
- 63 registered
- Evidence Score
- 0.8 / 100
Frequently Asked Questions about Thymosin Alpha 1
What is Thymosin Alpha 1?
Thymosin Alpha 1 is a 28-amino acid peptide naturally produced by the thymus gland that plays a critical role in immune system maturation and regulation. It is approved in over 35 countries for treatment of hepatitis B, hepatitis C, and as an immune adjuvant. Brand name Zadaxin.
How does Thymosin Alpha 1 work?
Thymosin Alpha 1 enhances T-cell maturation and differentiation, augments natural killer (NK) cell activity, increases dendritic cell function, and modulates cytokine production (IL-2, IFN-alpha, IFN-gamma). It promotes Th1 immunity while modulating excessive inflammatory responses. It also enhances vaccine response and has documented anti-tumor immune surveillance activity.
What is the recommended dosage for Thymosin Alpha 1?
The typical dose is 1.6 mg. 2 times per week. Administration: Subcutaneous injection. Standard dosing is 1.6mg twice weekly. Can be used continuously or in cycles. Approved dosing in hepatitis treatment is 1.6mg twice weekly for 6-12 months. Well-tolerated with an excellent safety profile over decades of clinical use.
What are the side effects of Thymosin Alpha 1?
Injection site discomfort. Mild fatigue. Muscle aches (rare). Rash (very rare)
What is the Thymosin Alpha 1 cycle protocol?
Thymosin Alpha 1 is typically cycled continuous. Can cycle or use continuously; 6-12 months typical
Questions reflect common community inquiries. This is not medical advice.