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Comparison

Thymosin Alpha-1 (Tα1) vs LL-37

Thymosin Alpha-1 vs LL-37: immune modulator vs direct antimicrobial peptide. Different jobs in the same system.

The verdict

Same immune system, two different jobs. Thymosin Alpha-1 modulates and tunes the immune response, it's approved in many countries for hepatitis and used as a chemo adjunct, and people reach for it with chronic immune issues or slow post-illness recovery. LL-37 is a direct antimicrobial peptide your body already makes, aimed more at active infections and biofilm-associated problems. For broad immune support and regulation, Thymosin Alpha-1. For a targeted antimicrobial angle, LL-37. They solve different parts of the puzzle rather than competing.

029
Thymosin Alpha-1 (Tα1)
ImmuneEvidence: Moderate

Thymosin Alpha-1 is the immune-system peptide. Approved in many countries for hepatitis and as adjunct to chemotherapy. Used here for chronic immune issues, post-illness recovery, or as a winter immune-support tool.

Onset
50
Documentation
40
Side intensity
46
Popularity
50
036
LL-37
ImmuneEvidence: Limited

LL-37 is an antimicrobial peptide your innate immune system already makes. People use it for chronic infections, biofilms (bacterial slime that resists antibiotics), and immune support. Strong effect in lab data, less data in humans.

Onset
50
Documentation
40
Side intensity
64
Popularity
50
Side-by-side
Field
Left
Right
Category
Immune
Immune
Half-life
~2 hours
~minutes systemically (longer locally)
Route
Subcutaneous
Subcutaneous
Schedule
1-2x weekly
Daily
Cycle length
4-8 weeks
4 weeks
Dose
1.6 mg sub-q, twice weekly. In clinical settings, dosing is condition-specific.
100-500 mcg sub-q daily for 4 weeks.
FDA
Not FDA approved in the U.S. Has orphan drug status for some indications. Approved in 35+ countries (sold as Zadaxin) for hepatitis B/C and chemotherapy adjunct.
Not FDA approved.
WADA
Not listed
Not listed
Natty?
Not natty
Grey area
Prescribed
Yes outside the U.S., prescribed by hepatology / oncology providers in countries where Zadaxin is approved.
Not prescribed in conventional medicine.
Top side effects
Generally well tolerated; Mild injection-site irritation
Mild flu-like symptoms early; Injection-site irritation; Mast-cell activation in sensitive users

Which one should you pick?

Pick Thymosin Alpha-1 (Tα1) if users with chronic immune issues or post-illness recovery support.

Pick LL-37 if users with chronic biofilm-associated infections or wound-healing contexts.

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