Research Reconstitution Reference
How Much Bacteriostatic Water for Retatrutide?
The standard research-protocol ratio is 2 mL bacteriostatic water per 10 mg retatrutide vial, producing 5 mg/mL. At that concentration, a 0.5 mg research dose draws to 10 units on a U-100 insulin syringe. Research and laboratory use only.
Direct Answer
10 mg vial + 2 mL bacteriostatic water = 5 mg/mL. Retatrutide (triple agonist) uses the same reconstitution math as tirzepatide. Scale linearly: 20 mg → 4 mL, 30 mg → 6 mL. Use 0.9% benzyl alcohol bacteriostatic water for the 28-day multi-draw window.
Retatrutide Reconstitution Chart
Research-protocol ratios across common lyophilized retatrutide vial strengths. Examples use U-100 insulin syringe units.
| Vial Strength | BAC Water to Add | Final Concentration | Draw Volume (Example) |
|---|---|---|---|
| 5 mg | 1.0 mL | 5.0 mg/mL | 0.10 mL (10 units) for 0.5 mg |
| 10 mg | 2.0 mL | 5.0 mg/mL | 0.10 mL (10 units) for 0.5 mg |
| 10 mg | 1.0 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 |
| 20 mg | 2.0 mL | 10.0 mg/mL | 0.05 mL (5 units) for 0.5 mg |
| 30 mg | 6.0 mL | 5.0 mg/mL | 0.10 mL (10 units) for 0.5 mg |
For non-standard vial strengths, use the reconstitution calculator.
Frequently Asked Questions
How much bacteriostatic water do I add to a 10 mg retatrutide research vial?
The standard research-protocol ratio is 2 mL of bacteriostatic water per 10 mg lyophilized retatrutide vial, producing 5 mg/mL. At that concentration, a 0.5 mg research dose draws to 0.10 mL (10 units on a U-100 insulin syringe). Retatrutide is a triple agonist (GLP-1 / GIP / glucagon) and the reconstitution math follows the same multi-agonist class conventions as tirzepatide.
Is the retatrutide reconstitution ratio different from tirzepatide?
No — retatrutide is reconstituted with bacteriostatic water at the same 5 mg/mL standard concentration most researchers use for tirzepatide. The peptide itself is different (triple agonist vs dual agonist), but the reconstitution math (mg per mL of diluent) is identical for the common vial sizes used in research.
Can I use a 10 mg/mL concentration to reduce injection volume?
Yes — adding 1 mL of bacteriostatic water to a 10 mg retatrutide vial yields 10 mg/mL. This halves the draw volume for any given dose but doubles the precision requirements on the syringe. Use a 0.5 mL low-dose insulin syringe with half-unit gradations for draws under 0.10 mL.
Why bacteriostatic water and not sterile water for retatrutide?
Retatrutide research protocols are weekly multi-dose schedules. The 0.9% benzyl alcohol preservative in bacteriostatic water inhibits microbial growth between draws, extending the reconstituted vial's usable life to 28 days refrigerated. Sterile water has no preservative and is single-use only — not suitable for multi-draw protocols.
How long is reconstituted retatrutide stable in bacteriostatic water?
Research stability data for triple-agonist peptides in bacteriostatic water indicates 28 days refrigerated at 2–8 °C, matching the standard bacteriostatic in-use window. Protect from light. Discard any vial with cloudiness, color change, or particulates regardless of date — these are signs of degradation or microbial contamination.
What's the difference between reconstituting retatrutide for research vs storage of stock peptide?
Lyophilized retatrutide is stable for months to years at -20 °C or below as a powder. Reconstituted retatrutide in bacteriostatic water is stable for 28 days refrigerated. If you need longer working stability, aliquot the reconstituted stock into smaller vials and freeze at -20 °C, then thaw individual aliquots as needed — but freeze/thaw cycling can degrade some peptides, so verify against the research literature for your specific protocol.
Where can I source research-grade bacteriostatic water for retatrutide?
BAC Water Depot (bacwaterdepot.com) ships USA-manufactured 10 mL bacteriostatic water vials with 0.9% benzyl alcohol, ISO 9001:2015 facility, three independent third-party laboratories verifying every production 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 retatrutide research?
USA-manufactured, ISO 9001:2015, three independent labs verify every lot. Research use only.
