RECONSTITUTION GUIDE
How Much BAC Water for Somatropin?
Quick answer: Add 1 mL of bacteriostatic water to a 10 mg Somatropin vial. This yields a concentration of 10 mg/mL. A standard 2 mg research dose then requires 0.2 mL (20 IU on a 100-unit insulin syringe).
Concentration by BAC water volume
Concentration and 2 mg draw volume at common BAC water volumes for a 10 mg vial.
| BAC water | Concentration | Dose volume | Draw |
|---|---|---|---|
| 1 mL Standard | 10 mg/mL | 0.2 mL | 20 IU |
| 2 mL | 5 mg/mL | 0.4 mL | 40 IU |
| 3 mL | 3.33 mg/mL | 0.6 mL | 60 IU |
| 5 mL | 2 mg/mL | 1 mL | 100 IU |
Dose volume at the standard 10 mg/mL concentration
How draw volume changes if you vary the dose at the standard 10 mg + 1 mL reconstitution.
| Dose | Volume | IU draw (100u) |
|---|---|---|
| 1 mg | 0.1 mL | 10 IU |
| 2 mg Std | 0.2 mL | 20 IU |
| 3 mg | 0.3 mL | 30 IU |
| 4 mg | 0.4 mL | 40 IU |
| 6 mg | 0.6 mL | 60 IU |
Reconstitution steps
- Wipe the top of both the Somatropin vial and the bacteriostatic water vial with alcohol swabs.
- Draw 1 mL of bacteriostatic water into a sterile syringe.
- Inject the water slowly down the inside glass wall of the Somatropin vial. Do not aim directly at the powder.
- Swirl gently until fully dissolved. Never shake.
- Refrigerate at 2–8°C protected from light. Allow to reach room temperature before each draw.
Supplies needed
- Somatropin 10 mg lyophilized vial
- 1 mL bacteriostatic water (0.9% benzyl alcohol)
- 100-unit (1 mL) U-100 insulin syringe
- Alcohol swabs
- Sharps container for disposal
Frequently asked
How much BAC water do I add to a 10 mg Somatropin vial?
For the standard ASCEND research protocol, add 1 mL of bacteriostatic water to a 10 mg Somatropin vial. This yields 10 mg/mL.
What concentration does 1 mL BAC water give for 10 mg Somatropin?
A 10 mg Somatropin vial reconstituted with 1 mL of bacteriostatic water yields 10 mg/mL. A 2 mg dose then requires 0.2 mL (20 IU on a 100-unit insulin syringe).
Can I use sterile water instead of bacteriostatic water for Somatropin?
Bacteriostatic water (0.9% benzyl alcohol) is preferred because it inhibits bacterial growth and allows multi-dose use of the reconstituted vial. Sterile water lacks preservative properties and accelerates peptide degradation once the vial is opened.
How long is Somatropin stable once reconstituted with BAC water?
Most research peptides remain stable for approximately 28 days when reconstituted with bacteriostatic water and stored at 2–8°C protected from light. Refer to peptide-specific stability data for any deviation from this baseline.
What size insulin syringe should I use for Somatropin?
For a 2 mg dose (20 IU draw), a 30-unit (0.3 mL) U-100 insulin syringe gives the finest resolution. A 100-unit syringe also works.
Related
For research use only. Not medical advice. Consult a qualified healthcare provider before using any peptide compound. Reconstitution parameters cross-referenced with independent 3rd-party analytical laboratories. · ASCEND · ascendpeptide.org