What is Bacteriostatic Water?
Bacteriostatic water (BAC water) is sterile water that contains 0.9% benzyl alcohol as a preservative. This preservative inhibits bacterial growth, making it safe for multi-use applications with peptides.
Why Use Bacteriostatic Water for Peptides?
The benzyl alcohol preservative is crucial for peptide reconstitution because:
- Peptides are used over multiple days/weeks
- Each injection introduces potential contamination
- The preservative prevents bacterial growth between uses
- Extends the usable life of reconstituted peptides to 28-30 days
Bacteriostatic Water vs Sterile Water
| Feature | Bacteriostatic Water | Sterile Water |
|---|---|---|
| Preservative | Yes (0.9% benzyl alcohol) | No |
| Multi-dose use | Yes (28-30 days) | No (single use only) |
| Peptide reconstitution | Recommended | Not recommended |
| Storage after opening | 28 days refrigerated | Discard immediately |
How Much Bacteriostatic Water to Use
The amount depends on your desired concentration and dose:
Common Reconstitution Examples
| Peptide Amount | BAC Water | Result |
|---|---|---|
| 5mg | 1mL | 5mg/mL (500mcg per 10 units) |
| 5mg | 2mL | 2.5mg/mL (250mcg per 10 units) |
| 10mg | 2mL | 5mg/mL (500mcg per 10 units) |
| 10mg | 4mL | 2.5mg/mL (250mcg per 10 units) |
How to Use Bacteriostatic Water
- Clean the rubber stopper with an alcohol swab
- Draw the desired amount into a syringe
- Insert needle into peptide vial at an angle
- Inject slowly down the vial wall
- Allow peptide to dissolve naturally
Storage Guidelines
- Unopened: Room temperature, away from light
- After opening: Refrigerate, use within 28 days
- Signs of contamination: Cloudiness, particles, color change
Where to Get Bacteriostatic Water
Bacteriostatic water is available from:
- Pharmacies (may require prescription)
- Medical supply companies
- Online peptide supply retailers
Common Mistakes to Avoid
- ❌ Using sterile water for multi-dose peptides
- ❌ Keeping BAC water at room temperature after opening
- ❌ Using BAC water past 28 days after opening
- ❌ Reusing syringes when drawing from the vial
Calculate Your Reconstitution
Use our Peptide Calculator to determine exactly how much bacteriostatic water to add for your desired concentration.