Thymosin Alpha-1
Thymosin Alpha-1 is a peptide naturally produced by the thymus gland that plays a crucial role in immune system modulation. It is approved in over 35 countries for various conditions including hepatitis B and C.
Mechanism of Action
Enhances T-cell function and maturation, stimulates dendritic cell activity, and modulates cytokine production. Promotes the differentiation of stem cells into mature T lymphocytes.
Dosage Overview
Dose Range
1.6 mg – 3.2 mg
Route
subcutaneous
Frequency
Weekly
Cycle Length
4–12 weeks
Reconstitution
Typical Dosage (Research)
Clinical dosing typically ranges from 1.6mg to 6.4mg administered subcutaneously 2-3 times weekly. Research protocols may vary.
Subcutaneous injection. Often used in cycles or as part of comprehensive immune support protocols.
Considerations for Men & Women
Women: Immune-modulating peptide used clinically for hepatitis B/C and as cancer immunotherapy adjunct. No established sex-specific differences in immune response. Safe in both sexes with standard dosing. Pregnancy category not established — use caution.
Men: Same immune-enhancing profile. Twice-weekly subcutaneous injection. Well-tolerated in clinical trials with both sexes.
Individual responses vary. These notes reflect general trends from research literature and are not medical advice.
Quick Calculator
Quick Calculator
Concentration: 2,500 mcg/ml
Volume to inject: 0.64 ml
Syringe units (U-100): 64.0 units
Pre-filled with Thymosin Alpha-1 defaults. Adjust values as needed.
Side Effects & Risks
Generally well-tolerated. Rare side effects include injection site reactions, mild flu-like symptoms, and temporary fatigue.
Should be used cautiously in autoimmune conditions. May interact with immunosuppressive medications. Consult healthcare provider before use.
Where to Buy Thymosin Alpha-1
All Vendor Details →US-based vendor with third-party HPLC testing and published COAs. One of the few reputable sources we've verified for research-grade peptides.
Some links on this page are affiliate links — we may earn a commission at no extra cost to you. Learn more.
Finnrick grades are based on independent HPLC lab testing. Learn more · Finnrick is a commercial service — ratings are third-party, not independent.
Who Uses Thymosin Alpha-1
Those seeking immune system support, individuals with chronic infections, cancer patients (under medical supervision), biohackers focused on longevity.
Similar Peptides
View All Alternatives →Mod GRF 1-29 (Modified GRF 1-29, also called CJC-1295 without DAC or Tetrasubstituted GRF 1-29) is a modified growth hormone-releasing hormone analog with improved stability over natural GHRH.
Human Growth Hormone (somatropin) is a 191-amino acid protein identical to naturally produced GH. FDA-approved for growth hormone deficiency, Turner syndrome, and other conditions. Widely used off-label for anti-aging and performance.
Alpha-defensins are small cationic peptides that are key components of the innate immune system. They have broad-spectrum antimicrobial activity against bacteria, fungi, and some viruses.
Cortexin is a polypeptide complex derived from pig brain cortex, used clinically in Russia and Eastern Europe for neurological conditions including stroke recovery, traumatic brain injury, and cognitive decline.
MGF (Mechano Growth Factor) is a splice variant of IGF-1 that is produced locally in muscle tissue in response to mechanical stress. The non-PEGylated form has a very short half-life.