How Much BAC Water for 20mg TB-500?
Quick answer: For a 20mg TB-500 vial, adding 2 mL of bacteriostatic water gives a concentration of 10000 mcg/mL. At this concentration, a 250 mcg dose equals approximately 2.5 syringe units on a U-100 insulin syringe. Use the concentration table below to choose the volume that best suits your target dose.
Concentration Table — 20mg TB-500
All syringe unit values assume a standard U-100 insulin syringe (100 units = 1 mL).
| BAC Water Added | Concentration | 250 mcg Dose | 500 mcg Dose |
|---|---|---|---|
| 1 mL | 20,000 mcg/mL | 1.25 units | 2.50 units |
| 2 mLcommon | 10,000 mcg/mL | 2.50 units | 5.00 units |
| 3 mL | 6,667 mcg/mL | 3.75 units | 7.50 units |
| 5 mL | 4,000 mcg/mL | 6.25 units | 12.5 units |
| 10 mL | 2,000 mcg/mL | 12.5 units | 25.0 units |
Which BAC Water Volume Should You Use?
- 1 mL — highest concentration (20,000 mcg/mL); best when working with very small dose volumes and large-barrel syringes.
- 2 mL — the most common choice for TB-500; balances concentration with easy-to-measure syringe markings.
- 3 mL — useful when target doses fall on inconvenient unit marks at 2 mL.
- 5 mL — lower concentration makes very small doses easier to measure precisely; larger final volume dilutes the peptide more.
- 10 mL — typically used for large-vial peptides or high-dose protocols; dose volumes will be larger per injection.
Researchers generally select the volume that places their target dose near a clean tick mark on the syringe barrel to minimize measurement error.
Reconstitution Calculator — TB-500
Educational use only. This calculator performs unit math on the values you provide and is not a substitute for medical advice. Verify every calculation independently.
Result
Numbers are computed from your inputs. Verify all calculations independently. Educational use only.
Storage After Reconstitution
Store lyophilized vials at 2–8°C. After reconstitution, refrigerate and use within 30 days.
Frequently Asked Questions
Frequently asked questions
How much BAC water should I add to a 20mg TB-500 vial?+
Adding 2 mL of bacteriostatic water to a 20mg TB-500 vial yields a concentration of 10000 mcg/mL — a common starting point that keeps dose volumes practical. Other volumes (1, 3, 5 mL) are also used depending on the desired concentration.
What concentration does 20mg TB-500 produce at 2 mL BAC water?+
At 2 mL of BAC water, a 20mg vial produces 10000 mcg/mL. A 250 mcg dose at this concentration equals approximately 2.5 syringe units on a U-100 insulin syringe.
How long does reconstituted TB-500 last after adding BAC water?+
Store lyophilized vials at 2–8°C. After reconstitution, refrigerate and use within 30 days.
Can I use sterile water instead of BAC water for TB-500?+
Bacteriostatic water (BAC water) is preferred because the 0.9% benzyl alcohol preservative inhibits bacterial growth, extending the shelf life of the reconstituted peptide to roughly 30 days. Sterile water lacks this preservative; if used, the reconstituted solution should be used within 24 hours.