Back to All Peptides
Immune SupportLongevity / General Healthinjectable

Thymosin Alpha-1

Strengthen immune defense and modulate immune response.

Human clinical evidenceStudied in one or more human clinical trials, but not FDA-approved for this use. Evidence quality and trial size vary — see sources.

For research purposes only. These products are not intended to diagnose, treat, cure, or prevent any disease. By purchasing, you confirm these products will be used for legitimate research purposes.

About Thymosin Alpha-1

Thymosin Alpha-1 is a peptide naturally produced by the thymus gland. It is critical for the maturation of T-cells and the coordination of immune response. It has been used clinically in over 35 countries for chronic hepatitis B and C, and as an immune adjuvant.

Key Benefits

  • Enhances T-cell function
  • Supports innate and adaptive immunity
  • May improve vaccine efficacy
  • Modulates inflammatory cytokines

Set a goal (top of the page) to see how Thymosin Alpha-1 scores against it, and what the better-evidenced alternatives are.

Category Ratings

Muscle & Strength
N/A
Fat Loss
N/A
Recovery
Minimal
Skin & Anti-Aging
N/A
Sleep
N/A
Cognitive
N/A
Immune
Very Good
Longevity
Mild
Bone & Hormonal
N/A

How to Take

Injection

Subcutaneous injection into abdominal fat, rotating injection sites

Common Side Effects

  • Injection site discomfort
  • Mild fatigue
  • Rare allergic reaction

Legal & Regulatory Status

Research use only in the US (FDA orphan-drug designations only). Approved as thymalfasin/Zadaxin in 35+ countries for hepatitis B/C and as an immune adjuvant; supported by human RCTs (mostly for sepsis/hepatitis).

Safety and regulatory details for FDA-approved compounds are drawn from the official product label via openFDA; clinical development status reflects ClinicalTrials.gov. This information is provided for research reference, is not endorsed by the FDA, and may not be complete or current.

Research & Sources

Human clinical evidenceStudied in one or more human clinical trials, but not FDA-approved for this use. Evidence quality and trial size vary — see sources.

Sources are selected for reliability (peer-reviewed literature, openFDA, ClinicalTrials.gov) but this is a research summary, not medical advice, and may not be exhaustive.

Thymosin Alpha-1

Prices at quality-checked sources · as of August 2026 (3 weeks ago)

Observed on each vendor’s public listing — see how these sources are vetted. Peptide Concierge doesn’t sell peptides and isn’t affiliated with any vendor; confirm current pricing at the source.

CategoryImmune
Formsinjectable

Builds a working set shared across the stack builder, calculator, scheduler and compare.