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Thymosin Alpha-1

Immune

Thymosin Alpha-1

Also known as Tα1, Thymalfasin, Zadaxin

Moderate human evidencePrescription in some countries

Price range: €45 through €98

Discussed for: Immune boost, chronic infections.

FIG. 2 · Amino-acid sequence of Thymosin Alpha-1 (28 residues)
  1. S
  2. D
  3. A
  4. A
  5. V
  6. D
  7. T
  8. S
  9. S
  10. E
  11. I
  12. T
  13. T
  14. K
  15. D
  16. L
  17. K
  18. E
  19. K
  20. K
  21. E
  22. V
  23. V
  24. E
  25. E
  26. A
  27. E
  28. N
  • Hydrophobic
  • Polar
  • Positive charge
  • Negative charge
  • Glycine / proline
Effect strengthHow hard it acts on the body5/10
Proof levelHow well that is shown in humans8/10
Risk levelHow much can go wrong2/10

Editorial 1 to 10 estimates from published research, not measured values. How to read these

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01 / Identity

What it is

Thymosin Alpha-1 is a natural peptide (28 aa). Main reported uses: immune boost, chronic infections. Current status: prescription in 35+ countries (hepatitis B/C); not US-approved.

Molecule type
Natural peptide (28 aa)
How it is taken
Injection (SC)
Other names
Tα1, Thymalfasin, Zadaxin

Route only. This library does not publish doses or protocols.

02 / Mechanism

How it is thought to work

Activates T-cells and dendritic cells

03 / Potential benefits

What people use it for

Immune boost, chronic infections

Moderate human evidence

Some human trials exist, but they are smaller, shorter or mixed.

Listed uses are what people use it for, not proven outcomes.

04 / Known risks

Side effects and risks

Injection-site reactions; generally well tolerated

Risk level 2 of 10

Lower risk score: reported side effects are mostly mild. Low risk is not no risk, especially for unregulated products.

Unknown long-term effects count as a risk, not as a clean record.

05 / Regulatory

Regulatory status

Status
Prescription in some countries
Details
Prescription in 35+ countries (hepatitis B/C); not US-approved
Sport (WADA)
Not listed

Status reflects information up to mid-2026 and changes over time. Check current sources.

06 / Evidence quality

How good is the evidence?

Moderate to strong

How we grade evidence

07 / Notes and sources

Notes and sources

  • Anyone using compounds like this regularly should have medical supervision and bloodwork (for example IGF-1, glucose and HbA1c, hormones, lipids).
  • Source: Peptide Reference Table, an editorial review of published research up to mid-2026. Scores are 1 to 10 editorial estimates, not measured values. Regulatory and WADA status change over time.

Educational information only. Not medical advice. Talk to a qualified healthcare professional before using any compound.

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