Mixing 25 mg TB-500
Adding 2 mL of bacteriostatic water to a 25 mg vial of TB-500 gives 12.5 mg/mL: each 10 units on a U-100 insulin syringe holds 1,250 mcg. With 1 mL it's 25 mg/mL (2,500 mcg per 10 units); with 3 mL, 8.333 mg/mL (833.3 mcg per 10 units). More water makes small amounts easier to measure.
Bacteriostatic water chart for a 25 mg vial
Strength for each amount of water, and how much TB-500 10 units and 1 unit hold on a U-100 insulin syringe (100 units = 1 mL).
| Water added | Strength | Per 10 units (0.1 mL) | Per unit |
|---|---|---|---|
| 0.5 mL | 50 mg/mL | 5,000 mcg | 500 mcg |
| 1 mL | 25 mg/mL | 2,500 mcg | 250 mcg |
| 1.5 mL | 16.667 mg/mL | 1,666.7 mcg | 166.67 mcg |
| 2 mL | 12.5 mg/mL | 1,250 mcg | 125 mcg |
| 2.5 mL | 10 mg/mL | 1,000 mcg | 100 mcg |
| 3 mL | 8.333 mg/mL | 833.3 mcg | 83.33 mcg |
| 4 mL | 6.25 mg/mL | 625 mcg | 62.5 mcg |
| 5 mL | 5 mg/mL | 500 mcg | 50 mcg |
Units to draw for an amount (with 2 mL of water)
Arithmetic only, not a recommended amount. For what published studies actually gave, see TB-500 research. Use the calculator for other amounts or water volumes.
| Amount | Units | Volume |
|---|---|---|
| 250 mcg (0.25 mg) | 2 units | 0.02 mL |
| 500 mcg (0.5 mg) | 4 units | 0.04 mL |
| 1,000 mcg (1 mg) | 8 units | 0.08 mL |
| 2,000 mcg (2 mg) | 16 units | 0.16 mL |
| 2,500 mcg (2.5 mg) | 20 units | 0.2 mL |
| 5,000 mcg (5 mg) | 40 units | 0.4 mL |
| 10,000 mcg (10 mg) | 80 units | 0.8 mL |
Cheapest 25 mg TB-500 vials
One listing per vendor, vendors scoring 80%+ on Finnrick's independent lab testing, cheapest per mg first.
| Vendor | Listing | Price | Per mg | |
|---|---|---|---|---|
| Tydes Finnrick 68% | TB-500 (Thymosin Beta 4) 25mg 1 × 25 mg | $119.99 | $4.80 | Buy |
| Skye Peptides Finnrick 57% | TB-500 (Thymosin Beta-4)(43 aa) 25 mg 1 × 25 mg | $129.00 | $5.16 | Buy |
Questions people ask
How much bacteriostatic water do I add to 25 mg of TB-500?
Adding 2 mL of bacteriostatic water to a 25 mg vial of TB-500 gives 12.5 mg/mL: each 10 units on a U-100 insulin syringe holds 1,250 mcg. With 1 mL it's 25 mg/mL (2,500 mcg per 10 units); with 3 mL, 8.333 mg/mL (833.3 mcg per 10 units). More water makes small amounts easier to measure.
How many units is 100 mcg of TB-500 from a 25 mg vial?
With 2 mL of water (12.5 mg/mL), 100 mcg is 0.8 units on a U-100 syringe; with 1 mL it's 0.4 units.
Where can I buy 25 mg TB-500 vials?
2 independently tested vendors list 25 mg TB-500 vials; the cheapest right now is Tydes at $4.80 per mg ($119.99 for 1 × 25 mg).