Step-by-step reconstitution of lyophilised Retatrutide and Tirzepatide research peptides with bacteriostatic water — volume calculations, sterile technique and storage. Laboratory research use only.
Retatrutide and Tirzepatide are supplied as lyophilised (freeze-dried) powder and must be reconstituted with bacteriostatic water before use in research applications. This guide covers sterile technique and the volume arithmetic only; it is a laboratory handling reference and is not dosing, administration or veterinary guidance. These compounds are supplied strictly for in-vitro laboratory research and are not for human or animal use.
The lyophilised peptide vial, bacteriostatic water (0.9% benzyl alcohol), a sterile syringe with needle, alcohol swabs, and a clean work surface. Allow a refrigerated vial to reach room temperature before opening to avoid moisture condensation on the powder.
The volume of bacteriostatic water you add sets the concentration of the resulting solution; the powder mass does not change. A simple way to think about it: concentration (mg/ml) = vial strength (mg) ÷ water added (ml). For a 10mg vial, adding 2ml of bacteriostatic water gives 5mg/ml, while adding 1ml gives 10mg/ml. Choose the volume that suits your protocol and the precision of your measuring equipment — larger volumes make small measured fractions easier to draw accurately. The /guides/peptide-calculator tool on this site performs the same arithmetic interactively.
Both compounds reconstitute the same way. Swab both stoppers, draw your calculated volume of bacteriostatic water, and run the water slowly down the inside wall of the vial rather than spraying it directly onto the powder. Allow the peptide to dissolve on its own; gentle swirling is acceptable but never shake or vortex, as agitation can damage the peptide. The solution should become clear within a minute or two.
Store reconstituted Retatrutide and Tirzepatide at 2-8°C (standard refrigerator) and protect from light. Use within 4-6 weeks for optimal stability, and avoid repeated freeze-thaw cycles. Label the vial with the compound name, concentration and date of reconstitution. Keep lyophilised, unopened vials at -20°C for long-term storage.
Spraying water directly onto the powder; shaking or vortexing the vial; using non-sterile or plain (non-bacteriostatic) water for a multi-use vial; leaving the reconstituted solution at room temperature; and failing to record the concentration and date. Discard any solution that appears cloudy, discoloured or contains visible particles.
Allow a refrigerated lyophilised vial to equilibrate to room temperature, then wipe the stopper with an alcohol swab.
Decide on your target concentration and calculate the bacteriostatic water volume as vial strength (mg) ÷ desired concentration (mg/ml).
Using a sterile syringe, draw the calculated volume of bacteriostatic water.
Insert the needle through the stopper and inject the water slowly against the inside wall of the vial — never directly onto the peptide powder.
Let the vial stand for 1-2 minutes. Swirl gently if needed; never shake. The solution should be clear.
Label the vial with compound, concentration and date, then store at 2-8°C protected from light.
Research-grade compounds referenced in this guide, supplied with full Certificates of Analysis.
All products sold by Neovia Peptides are strictly for in-vitro research and laboratory use only. Not intended for human or veterinary use, food additives, drugs, or cosmetics. By purchasing from this website, you agree that you understand and accept these terms.
