Thymalin is a mix of peptides extracted from the thymus gland, developed in Russia by the group of V. Khavinson and used there for immune-related conditions. It is not approved in the US, and most published studies come from the group that developed it.
Also known as: Thymic peptide extract.
Thymalin is usually supplied as 10 mg powder vials.
Water and syringe-unit charts by vial size: 10 mg
Here is the math for a 10 mg vial mixed with 2 mL of bacteriostatic water, drawing 5 mg with a U-100 insulin syringe (1 mL = 100 units).
10 mg ÷ 2 mL = 5 mg/mL5 mg ÷ 5 mg/mL = 1 mL1 mL × 100 = 100 units| Amount | Volume | U-100 syringe |
|---|---|---|
| 2.5 mg | 0.5 mL | 50 units |
| 5 mg | 1 mL | 100 units |
| 10 mg | 2 mL | 200 units (over 1 mL) |
Adding more water doesn't change how much thymalin is in the vial. It only spreads it over more liquid, so each draw is bigger and easier to read.
| Water added | Concentration | Volume | U-100 syringe |
|---|---|---|---|
| 1 mL | 10 mg/mL | 0.5 mL | 50 units |
| 2 mL | 5 mg/mL | 1 mL | 100 units |
For any other vial size or amount, the free peptide reconstitution calculator works backwards from the amount you want and suggests a water volume that lands on a clean syringe mark.
Reviews by its developers describe Thymalin as stimulating immunity and report clinical use in Russia. A 2020 lab study found it pushed human blood stem cells toward mature T cells. We could not find a large independent randomized trial.
We could not find a published human half-life for this compound. Figures quoted online usually come from animal or cell studies, so we do not list one here.