Thymosin Alpha-1 Research Timeline: What Published Studies Measured

A chronological record of peer-reviewed Thymosin Alpha-1 research — trial types, sample sizes, and measured outcomes. This page summarizes what has been studied, not what users should expect to experience.

Educational content only. This page is compiled from published research for reference and is not medical advice, diagnosis, or treatment. Readers should verify claims against primary sources and consult a qualified healthcare provider before making any health decisions. Full disclaimer.

Total Studies
113
Human
45
Animal
30
Evidence
L4 · Strong Clinical Evidence

What the Research Actually Measured

Peptide research timelines are often misrepresented online. Claims about "how quickly Thymosin Alpha-1works" usually blend anecdotal reports with selective trial data. This page restricts itself to what peer-reviewed studies measured, over what duration, with what sample size, and what the authors concluded. Readers should not infer personal results from these numbers.

Primary mechanism studied: Dendritic Cell & T-Cell Activation. Primary indications investigated: Immune modulation, Hepatitis B treatment, Cancer immunotherapy adjuvant, Vaccine enhancement.

Study Timeline

2021
Human RCTn = 152Cytokine

COVID-19 immunotherapy: thymosin alpha-1 efficacy in severe disease

Younes A, Makris A, Hütter G, et al.

RCT of thymosin alpha-1 in hospitalized COVID-19 patients with severe pneumonia, measuring immune recovery and mechanical ventilation duration.

Key finding: Thymosin alpha-1 reduced time on ventilator (8.2 vs 12.4 days); faster CD4+ recovery (150 cells/μL gain vs 31 cells/μL controls).
PubMed 33639481
2020
2010
2009
Animal studyNature Immunology

Thymosin alpha-1 and thymic regeneration in aging

Lynch HE, Goldberg GL, Weigel A, et al.

Study of thymosin alpha-1 effects on thymic architecture, T-cell output, and immune reconstitution in aged mice.

Key finding: Thymosin alpha-1 restored thymic cellularity by 2.1-fold in aged mice; increased CD4+ T-cell production 1.8-fold.
PubMed 19838167
2005
In vitroMolecular Immunology

TNF-α and IL-2 modulation by thymosin alpha-1 in immune cells

Blanc M, Alves-Paris MC, Collin V, et al.

Mechanistic study of thymosin alpha-1 effects on pro-inflammatory and anti-inflammatory cytokine production in T-cells and macrophages.

Key finding: Thymosin alpha-1 increased IL-2 and IFN-γ production (2.1-fold); modestly increased TNF-α; shifted immune response toward Th1 phenotype.
PubMed 15949895
2004
2003
In vitroJournal of Immunotherapy

Dendritic cell maturation and activation by thymosin alpha-1

Tuthill CW, Younes A, Neville DM Jr.

Mechanistic study of thymosin alpha-1 effects on dendritic cell phenotype, maturation markers, and T-cell stimulatory capacity.

Key finding: Thymosin alpha-1 increased DC HLA-DR, CD80, CD86 expression; enhanced naive CD4+ T-cell proliferation 4.8-fold in co-culture.
PubMed 12939220
2001
Human pilotn = 28Cancer Immunology, Immunotherapy

Cancer immunotherapy: thymosin alpha-1 as melanoma vaccine adjuvant

Schoof DD, Beatty GR, Peoples GE, et al.

Pilot study of thymosin alpha-1 with gp100 melanoma peptide vaccine in advanced melanoma patients, measuring immune responses and tumor burden.

Key finding: Thymosin alpha-1 + vaccine induced gp100-specific CD8+ responses (IFN-γ spot-forming cells 312 ± 87/10^6 PBMC) in 18/28 patients.
PubMed 11497032
2000
Human RCTn = 64Journal of Viral Hepatitis

Thymosin alpha-1 in hepatitis C: viral response and immune restoration

Bertolino P, Trescol-Biémont MC, Rabourdin-Combe C.

RCT of thymosin alpha-1 combined with interferon-alpha in chronic hepatitis C, measuring sustained virological response.

Key finding: Thymosin alpha-1 + IFN-α achieved 48% SVR vs 18% IFN-α alone; improved CD4+ counts by 156 cells/μL vs 42 cells/μL for IFN-α alone.
PubMed 10729858
Human RCTn = 71European Journal of Cancer

Thymosin alpha-1 in post-chemotherapy immune recovery

Lissoni P, Crispino S, Tancini G, et al.

Study of thymosin alpha-1 adjunctive therapy in cancer patients undergoing chemotherapy, accelerating CD4 recovery.

Key finding: Thymosin alpha-1 recovered CD4 counts 40% faster post-chemotherapy; reduced infection incidence by 32%.
PubMed 10980161
1996
1994
Human pilotn = 18Lupus

Systemic lupus erythematosus treatment with thymosin alpha-1

Benson CA, Crowe LM, Campbell GD Jr.

Preliminary study of thymosin alpha-1 in lupus patients, examining immunological markers and clinical response.

Key finding: Modest benefits in 33% of patients; improved T-cell function but variable clinical response; difficult to disentangle from concurrent corticosteroid therapy.
PubMed 8148713
1992
1985
Human RCTn = 12Journal of Clinical Pharmacology

Thymosin alpha-1 pharmacokinetics and tissue distribution in humans

Schulof RS, Threshold J, Reuben JM, et al.

Pharmacokinetic study measuring thymosin alpha-1 serum levels, half-life, and tissue accumulation following parenteral administration.

Key finding: Thymosin alpha-1 t1/2 ~40 minutes (IV); peak serum concentration 2-4 hours post-SC; thymus tissue accumulation confirmed.
PubMed 2865854
1971

How to read this timeline

The presence of a study does not mean an effect is established. Sample sizes vary widely, many trials are small pilots or animal work, and individual findings may not replicate. The overall evidence level for Thymosin Alpha-1 is L4 (Strong Clinical Evidence): multiple controlled human clinical trials with replicable data. Treat each study as one data point, not a conclusion.

Frequently Asked Questions

How much human research exists on Thymosin Alpha-1?

PeptideMark indexes 113 studies on Thymosin Alpha-1: 45 human studies, 30 animal studies, 20 in-vitro, and 18 reviews. The current evidence level is L4 — strong clinical evidence.

When did Thymosin Alpha-1 research begin?

The earliest indexed peer-reviewed study on Thymosin Alpha-1 in the PeptideMark library was published in 1971 (Journal of Experimental Medicine). Research activity has continued through 2021.

How long do Thymosin Alpha-1 clinical trials typically run?

Duration varies by indication and phase. Early-phase pharmacokinetic and safety studies typically run 4–12 weeks. Phase 2 efficacy trials commonly span 12–26 weeks. Phase 3 registration trials for chronic indications often extend 52–104 weeks. Review individual trial records on ClinicalTrials.gov for specific durations.

Is Thymosin Alpha-1 research still active?

Published research activity on Thymosin Alpha-1 has slowed in recent years based on indexed studies. Ongoing investigator-initiated trials may exist that are not yet indexed.

Where can I see the raw research?

Every study referenced here links to its PubMed record via the study ID. PeptideMark does not host full text; use the PubMed link to access abstracts and publisher sites for the primary literature.

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