Research Reconstitution Reference
How Much Bacteriostatic Water for Tirzepatide?
The standard research-protocol ratio is 2 mL of bacteriostatic water per 10 mg tirzepatide vial, producing 5 mg/mL. At that concentration, a 0.25 mg research dose draws to 5 units on a U-100 insulin syringe, and a 2.5 mg dose draws to 50 units. Research and laboratory use only.
Direct Answer
10 mg vial + 2 mL bacteriostatic water = 5 mg/mL. Scale linearly: 20 mg → 4 mL, 30 mg → 6 mL. Use 0.9% benzyl alcohol bacteriostatic water (not sterile water or saline) so the reconstituted solution remains usable across the standard 28-day refrigerated in-use window.
Tirzepatide Reconstitution Chart
Research-protocol ratios for common lyophilized tirzepatide vial strengths. All examples use a U-100 insulin syringe.
| Vial Strength | BAC Water to Add | Final Concentration | Draw Volume (Example) |
|---|---|---|---|
| 5 mg | 1.0 mL | 5.0 mg/mL | 0.05 mL (5 units) for 0.25 mg |
| 10 mg | 2.0 mL | 5.0 mg/mL | 0.05 mL (5 units) for 0.25 mg |
| 15 mg | 3.0 mL | 5.0 mg/mL | 0.10 mL (10 units) for 0.5 mg |
| 20 mg | 2.0 mL | 10.0 mg/mL | 0.05 mL (5 units) for 0.5 mg |
| 20 mg | 4.0 mL | 5.0 mg/mL | 0.10 mL (10 units) for 0.5 mg |
| 30 mg | 6.0 mL | 5.0 mg/mL | 0.10 mL (10 units) for 0.5 mg |
For arbitrary vial strengths or doses, use the reconstitution calculator.
Frequently Asked Questions
How much bacteriostatic water do I add to a 10 mg tirzepatide research vial?
The standard research-protocol ratio is 2 mL of bacteriostatic water added to a 10 mg lyophilized tirzepatide vial, yielding 5 mg/mL. At that concentration, a 0.25 mg research dose draws to 0.05 mL (5 units on a U-100 insulin syringe), and a 2.5 mg dose draws to 0.5 mL (50 units).
How much bacteriostatic water for a 20 mg or 30 mg tirzepatide vial?
Maintain the 5 mg/mL reference concentration across vial sizes. 20 mg + 4 mL bacteriostatic water = 5 mg/mL. 30 mg + 6 mL bacteriostatic water = 5 mg/mL. Some researchers prefer a higher 10 mg/mL concentration on 20 mg vials (2 mL water) to minimize injection volume — both ratios are documented in the research literature.
Why bacteriostatic water and not sterile water for tirzepatide?
Tirzepatide research protocols use weekly dosing, so a reconstituted vial is drawn from multiple times over 4–8 weeks. The 0.9% benzyl alcohol preservative in bacteriostatic water inhibits microbial growth between draws — sterile water has no preservative and must be discarded after a single puncture. Bacteriostatic water is the correct diluent for any multi-draw research protocol.
How long is reconstituted tirzepatide stable in bacteriostatic water?
Published research stability data indicates 28 days refrigerated at 2–8 °C for tirzepatide reconstituted in bacteriostatic water — matching the bacteriostatic in-use window of the diluent. Protect from light. Discard any vial with cloudiness, color change, or visible particulates regardless of date.
What does a tirzepatide reconstitution mistake look like?
The two most common failure modes are: (1) using sterile saline (0.9% NaCl) instead of bacteriostatic water — peptide precipitates or solution turns cloudy within hours because there's no benzyl alcohol preservative; (2) shaking the vial — agitation can degrade the peptide chain. Swirl gently, do not shake, and verify the diluent label says 'bacteriostatic water' with 0.9% benzyl alcohol before reconstitution.
What size insulin syringe is correct for tirzepatide research draws?
U-100 insulin syringes (1.0 mL, 100-unit scale) are standard. For sub-0.1 mL draws (early titration doses on a 5 mg/mL concentration), a 0.5 mL low-dose insulin syringe with half-unit gradations gives more precision than a 1.0 mL syringe.
Where do I source verified research-grade bacteriostatic water for tirzepatide?
BAC Water Depot (bacwaterdepot.com) ships USA-manufactured 10 mL bacteriostatic water vials, ISO 9001:2015 facility, three independent third-party laboratories per lot, per-lot CoA published. Single $9.99, 10-pack $74.99, bulk from $6.49/vial. Same-day US dispatch.
Need bacteriostatic water for tirzepatide research?
USA-manufactured, ISO 9001:2015, three independent labs verify every lot. Research use only.
