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Compounds / Thymosin Alpha-1

Thymosin Alpha-1

Full name
Thymosin Alpha-1 (Tα1)
Mechanism
28-amino-acid peptide derived from prothymosin alpha. Immunomodulatory: enhances T-cell maturation/function, dendritic-cell and NK activity, and Toll-like-receptor signalling.
Half-life
~2 hours
Administration
subcutaneous
Typical dosage*
low: 1.6mg 2x/week · typical: 1.6mg SC twice weekly (registered protocols) · high: varies by clinical indication
Researched for
immune support adjunct (approved in some countries for hepatitis B/C, as vaccine adjuvant, sepsis research)
Reported side effects
generally well tolerated, injection-site reaction
Interactions
may enhance vaccine response (studied)
Commonly combined
used standalone in clinical immune protocols
Scheduling
🇦🇺 AUNot ARTG-registered; research/compounded with prescription
🇺🇸 USNot FDA-approved (orphan-drug history)
🇬🇧 UKNot licensed
Regulatory status
Approved/marketed as Zadaxin in several countries (e.g. parts of Asia, Latin America); not approved in AU/US/UK.
Recon default
1600 mcg typical · 1 ml BAC · refrigerated per product

*Doses are commonly-reported figures from public sources, not a recommendation. Educational only.

25studies
9faqs
immuneapproved-drug-some-countries

Studies (25)

YearTitle / venueSource
2025Aging and Thymosin Alpha-1
International journal of molecular sciences · preclinical
PMID 41373628
2024Thymosin α1 reverses oncolytic adenovirus-induced M2 polarization of macrophages to improve antitumor immunity and therapeutic efficacy
Cell reports. Medicine · preclinical
PMID 39357524
2024Phenotypic drug discovery: a case for thymosin alpha-1
Frontiers in medicine · preclinical
PMID 38903817
2024Thymosin Alpha 1 Plus Routine Treatment for the Acute Exacerbation of Chronic Obstructive Pulmonary Disease: A Systematic Review and Meta-Analysis
Journal of the College of Physicians and Surgeons--Pakistan : JCPSP · preclinical
PMID 39648386
2024Comprehensive Review of the Safety and Efficacy of Thymosin Alpha 1 in Human Clinical Trials
Alternative therapies in health and medicine · preclinical
PMID 38308608
2023A Pilot Trial of Thymalfasin (Thymosin-α-1) to Treat Hospitalized Patients With Hypoxemia and Lymphocytopenia Due to Coronavirus Disease 2019 Infection
The Journal of infectious diseases · preclinical
PMID 36056913
2023Thymosin α-1 in cancer therapy: Immunoregulation and potential applications
International immunopharmacology · preclinical
PMID 36812669
2023The efficacy of thymosin alpha-1 therapy in moderate to critical COVID-19 patients: a systematic review, meta-analysis, and meta-regression
Inflammopharmacology · preclinical
PMID 37845598
2022Thymosin α-1 Reverses M2 Polarization of Tumor-Associated Macrophages during Efferocytosis
Cancer research · preclinical
PMID 35364609
2021Efficacy of Thymosin Alpha 1 in the Treatment of COVID-19: A Multicenter Cohort Study
Frontiers in immunology · preclinical
PMID 34408744
2020Thymosin alpha 1: A comprehensive review of the literature
World journal of virology · preclinical
PMID 33362999
2019Bioactive Thymosin Alpha-1 Does Not Influence F508del-CFTR Maturation and Activity
Scientific reports · preclinical
PMID 31311979
2018Thymosin alpha 1 treatment for patients with sepsis
Expert opinion on biological therapy · preclinical
PMID 30063866
2018Serum thymosin alpha 1 levels in normal and pathological conditions
Expert opinion on biological therapy · preclinical
PMID 30063864
2017Thymosin alpha 1 and HIV-1: recent advances and future perspectives
Future microbiology · preclinical
PMID 28106477
2016Immune Modulation with Thymosin Alpha 1 Treatment
Vitamins and hormones · preclinical
PMID 27450734
2016Structures of Thymosin Proteins
Vitamins and hormones · preclinical
PMID 27450728
2015Thymosin alpha-1 treatment in chronic hepatitis B
Expert opinion on biological therapy · preclinical
PMID 25640173
2015Historical review of thymosin α 1 in infectious diseases
Expert opinion on biological therapy · preclinical
PMID 26098768
2004Thymalfasin (thymosin-alpha 1) therapy in patients with chronic hepatitis B
Journal of gastroenterology and hepatology · preclinical
PMID 15546254
2004Thymalfasin (thymosin-alpha 1) therapy in patients with chronic hepatitis B
Journal of gastroenterology and hepatology · preclinical
PMID 15641208
2001Thymosin alpha-1
American journal of health-system pharmacy : AJHP : official journal of the American Society of Health-System Pharmacists · preclinical
PMID 11381492
1998Thymic endocrinology
Annals of the New York Academy of Sciences · preclinical
PMID 9629262
1994Clinical applications of thymosin alpha-1
Cancer investigation · preclinical
PMID 7922712
1994T-cell adjuvants
International journal of immunopharmacology · preclinical
PMID 7806429

Questions (9)

What is Thymosin Alpha-1?

Thymosin Alpha-1 (Thymosin Alpha-1 (Tα1)). 28-amino-acid peptide derived from prothymosin alpha. Immunomodulatory: enhances T-cell maturation/function, dendritic-cell and NK activity, and Toll-like-receptor signalling.

What is Thymosin Alpha-1 used for?

Commonly discussed uses: immune support adjunct (approved in some countries for hepatitis B/C, as vaccine adjuvant, sepsis research). There is both human and animal/preclinical research, though the depth and quality vary by indication. Note: most uses are not approved indications.

How does Thymosin Alpha-1 work?

Mechanism: 28-amino-acid peptide derived from prothymosin alpha. Immunomodulatory: enhances T-cell maturation/function, dendritic-cell and NK activity, and Toll-like-receptor signalling.

Is Thymosin Alpha-1 safe?

Reported considerations: generally well tolerated, injection-site reaction. There is both human and animal/preclinical research, though the depth and quality vary by indication. Approved/marketed as Zadaxin in several countries (e.g. parts of Asia, Latin America); not approved in AU/US/UK. This is not a safety endorsement; safety data for unapproved compounds is incomplete.

What is the typical dose of Thymosin Alpha-1?

Commonly cited ranges (educational reference, not a recommendation): low 1.6mg 2x/week, typical 1.6mg SC twice weekly (registered protocols), high varies by clinical indication. Administration: subcutaneous. Half-life: ~2 hours.

Is Thymosin Alpha-1 legal in Australia?

Australian status: Not ARTG-registered; research/compounded with prescription. Approved/marketed as Zadaxin in several countries (e.g. parts of Asia, Latin America); not approved in AU/US/UK. General regulatory context: most active peptides are Schedule 4 and require a prescription; import via the Personal Importation Scheme requires a valid Australian prescription for prescription-only goods.

How do you store Thymosin Alpha-1?

Reconstitution/storage reference: 1ml sterile water per 1.6mg vial (per registered product); storage: refrigerated after reconstitution.

What is Thymosin Alpha-1 commonly stacked with?

Commonly discussed combinations (anecdotal for unapproved compounds): used standalone in clinical immune protocols. Stacking increases interaction/safety uncertainty.