Side-by-Side Comparison · 2026

Thymosin Alpha-1 vs Thymulin

Thymosin Alpha-1 vs Thymulin — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Thymosin Alpha-1
Immune Support

Thymosin Alpha-1 (TA1) is a 28-amino acid peptide naturally secreted by thymic epithelial cells, commercially available as Thymalfasin (Zadaxin). It is approved as a pharmaceutical drug in over 35 countries (including China, Italy, and Singapore) for chronic hepatitis B, chronic ...

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Thymulin
Immune Support

Thymulin (FTS) is a zinc-dependent nonapeptide hormone produced exclusively by thymic epithelial cells. It is the only known peptide that is thymus-specific - thymulin levels directly reflect thymic functional capacity....

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Key Parameters
Parameter Thymosin Alpha-1 Thymulin
Category Immune Support Immune Support
Research Extensively Studied Extensively Studied
Half-Life ~2 hours ~30 min (active Zn-bound form)
Typical Dose 0.8–1.6 mg 1–50 µg
Frequency 2× weekly or daily Once daily (nanomolar dosing)
Route Subcutaneous Subcutaneous
FDA Status Not Approved (US) Not Approved

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Frequently Asked Questions
What is the difference between Thymosin Alpha-1 and Thymulin?
Thymosin Alpha-1: Thymosin Alpha-1 (TA1) is a 28-amino acid peptide naturally secreted by thymic epithelial cells, commercially available as Thymalfasin (Zadaxin). It is approved as a pharmaceutical drug in over 35 cou... Thymulin: Thymulin (FTS) is a zinc-dependent nonapeptide hormone produced exclusively by thymic epithelial cells. It is the only known peptide that is thymus-specific - thymulin levels directly reflect thymic f...
Which has a longer half-life, Thymosin Alpha-1 or Thymulin?
Thymosin Alpha-1 half-life: ~2 hours. Thymulin half-life: ~30 min (active Zn-bound form).
Can you stack Thymosin Alpha-1 and Thymulin?
Thymosin Alpha-1 and Thymulin are in the same category and used together in research protocols. Always consult relevant literature and follow appropriate guidelines.

For research use only. Not medical advice. ASCEND does not conduct or endorse any specific research protocol. Always consult relevant scientific literature and regulatory guidelines.