How to Reconstitute Peptides with Bacteriostatic Water
A step-by-step guide for researchers using sterile BAC water for peptide and hormone reconstitution.
What is Bacteriostatic Water?
Bacteriostatic water (BAC water) is sterile water containing 0.9% benzyl alcohol as a preservative. Unlike plain sterile water — which must be discarded after a single use — BAC water inhibits bacterial growth, making it safe for multi-dose use over an extended period.
It is the industry-standard solvent for reconstituting lyophilized (freeze-dried) peptides and hormones in research settings. The benzyl alcohol preservative keeps the vial sterile across multiple needle insertions, which is critical for protocols requiring repeated draws from the same vial.
How to Reconstitute Peptides – Step by Step
Proper reconstitution technique ensures compound integrity and minimizes contamination risk. Follow these steps carefully for every preparation.
- 1 Gather your supplies
You will need: the lyophilized peptide vial, a vial of bacteriostatic water, a 1ml insulin syringe, alcohol swabs, and a clean work surface. Wear gloves when handling.
- 2 Calculate the required BAC water volume
Determine how much BAC water you need based on the peptide quantity and your desired concentration. A common starting point: add 1ml of BAC water to a 5mg peptide vial to get a 5mg/ml concentration. Adjust based on your protocol.
- 3 Swab both vial tops with alcohol
Use a fresh alcohol swab on the rubber stopper of both the BAC water vial and the peptide vial. Allow to air dry for 30 seconds before puncturing.
- 4 Draw BAC water into the syringe
Insert the syringe needle into the BAC water vial and carefully draw the calculated volume. Remove the needle and inspect for air bubbles — gently tap and expel any air.
- 5 Inject BAC water slowly into the peptide vial
Angle the syringe so the BAC water runs down the inside wall of the vial rather than directly onto the lyophilized powder. This gentle technique prevents degradation of delicate peptide bonds.
- 6 Gently swirl — do not shake
Roll the vial slowly between your palms or swirl gently until the powder fully dissolves. The solution should be clear and colorless. Never shake or vortex — agitation can denature peptide structures.
- 7 Label and refrigerate immediately
Label the vial with the peptide name, concentration, reconstitution date, and expiry (28 days from reconstitution when stored at 2–8°C). Store in a refrigerator, away from light.
Common Peptide Reconstitution Reference Table
The table below shows typical BAC water volumes used for common research peptides. Always refer to your specific protocol documentation for final concentrations.
| Peptide | Vial Size | BAC Water Added | Resulting Concentration | Recommended Vial Size |
|---|---|---|---|---|
| BPC-157 | 5mg | 2ml | 2.5mg/ml | 10ml |
| Sermorelin | 6mg | 6ml | 1mg/ml | 10ml |
| Ipamorelin | 5mg | 2.5ml | 2mg/ml | 10ml |
| CJC-1295 | 5mg | 2.5ml | 2mg/ml | 10ml |
| TB-500 (Thymosin Beta-4) | 10mg | 10ml | 1mg/ml | 30ml |
| HGH (Somatropin) | 10 IU | 1ml | 10 IU/ml | 30ml |
| PT-141 (Bremelanotide) | 10mg | 5ml | 2mg/ml | 10ml |
| GHRP-6 | 5mg | 5ml | 1mg/ml | 10ml |
* These values are for general reference. Actual protocol volumes depend on specific research requirements.
10ml vs 30ml – Which Should You Buy?
Choosing the right vial size depends on how many peptides you are reconstituting and the volume each protocol requires.
| 10ml Vial | 30ml Vial | |
|---|---|---|
| Starting price | $6.99 | $8.99 |
| Best for | Low-volume protocols (BPC-157, CJC-1295, Ipamorelin) | High-volume protocols (TB-500, HGH, multi-peptide labs) |
| Draws per vial | Up to 10 × 1ml draws | Up to 30 × 1ml draws |
| Multi-use window | Up to 28 days | Up to 28 days |
| Bulk packs available | 1, 2, 5, 10-pack | 1, 2, 5, 10-pack |
| Recommended for | Single researcher, short protocols | Active labs, long-term studies |
Storage & Shelf Life
- Unopened BAC water vials: Store at room temperature (15–30°C), away from direct light.
- After reconstitution: Refrigerate at 2–8°C immediately. Use within 28 days.
- Do not freeze reconstituted peptides — freezing can damage compound structure.
- Discard if cloudy or if particulates are visible — this indicates contamination.
- Label every vial with reconstitution date and contents.
Shop Bacteriostatic Water
All Renew Lab Group bacteriostatic water is manufactured in Houston, TX with strict quality controls. Available in 10ml and 30ml vials, in packs of 1 through 10.
