Thymosin Alpha-1
Tα1 · Thymalfasin
A thymus-derived peptide approved in a number of countries as an immune modulator, notably for hepatitis B and C.
At a glance
- Category
- Immune
- Half-life
- ~2 hours
- Typical vial sizes
- 5 mg · 10 mg
Concentration by water volume
Pure arithmetic: the vial strength divided by the water added. The dose itself comes from your clinician, pharmacy, product instructions, or research protocol — enter it in the calculator below.
| Vial | Water added | Concentration | Per U-100 unit |
|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 50 mcg |
| 5 mg | 2 mL | 2.5 mg/mL | 25 mcg |
| 5 mg | 3 mL | 1.667 mg/mL | 16.667 mcg |
| 10 mg | 1 mL | 10 mg/mL | 100 mcg |
| 10 mg | 2 mL | 5 mg/mL | 50 mcg |
| 10 mg | 3 mL | 3.333 mg/mL | 33.333 mcg |
Storage
- Lyophilised (unmixed)
- Refrigerated.
- Reconstituted
- Refrigerate at 2–8°C.
What people log it against
Outcomes users commonly track alongside this compound. Listing them is not a claim that it produces them.
- Immune support
- Recovery tracking
Read alongside Thymosin Alpha-1
Compounds this one is commonly compared with or mistaken for. Listing a pairing is not a suggestion to use them together.
References
Each source below establishes only the specific claim noted with it, last checked 2026-08-13. Storage times reflect common handling guidance and are not established by these references.
- Pharmacokinetics of thymosin alpha1 after subcutaneous injection, 1999 — PMID 10027483
Healthy volunteers, three SC formulations incl. Zadaxin. Tmax 1-2 h; the authors infer a "short elimination half-life of less than 3 hours" from the lack of accumulation between single and multiple dosing. Note this is an upper BOUND, not a measured value — 2 h is consistent with it but is not itself stated in the paper.
Run your own numbers
Enter the dose and concentration from your clinician, pharmacy, product instructions, or research protocol. VialPal handles the math.
As printed on the vial label
How much water you add to the vial
From your clinician, pharmacy, product instructions, or research protocol. 1000 mcg = 1 mg
Fills in a vial size this compound is commonly sold in. It does not fill in a dose — check the size against your own vial label.
Enter your numbers
Still needed: vial strength, bacteriostatic water, dose. Use the figures on your vial label and the dose from your clinician, pharmacy, product instructions, or research protocol — VialPal handles the math.
Keep this vial. VialPal holds the concentration, counts down the doses left in it, and logs the ones you actually took.
Get VialPalVialPal does the arithmetic — it does not tell you what to take. Dose decisions belong between you and a qualified clinician.