Guide

Bacteriostatic water: what it is and how much to use

Bacteriostatic water is sterile water carrying 0.9% benzyl alcohol, which holds back bacterial growth so a reconstituted vial stays usable over weeks instead of a single occasion. Most peptide vials call for 1-3 mL; NAD+ 500mg needs 5 mL and glutathione 600mg needs 6 mL. In Australia it is sold in 10mL and 30mL vials.

Peptide Aus · Updated 5 September 2026 · For in-vitro research; not medical or dosing advice.

Why not just plain sterile water

Plain sterile water carries no preservative, so a vial made up with it should be used straight away. The benzyl alcohol in bacteriostatic water keeps a reconstituted peptide good across the 8-12 week window at 2-8 °C.

How much goes into each vial

Vial	Suggested water	Resulting concentration
BPC-157 (10mg)	2 mL	5 mg/mL
GHK-Cu (100mg)	3 mL	33.3 mg/mL
GHK-Cu (50mg)	3 mL	16.7 mg/mL
Glutathione (600mg)	6 mL	100 mg/mL
KLOW Peptide Blend (80mg)	3 mL	26.7 mg/mL
NAD+ (500mg)	5 mL	100 mg/mL
Retatrutide (10mg)	1 mL	10 mg/mL
Retatrutide (15mg)	1.5 mL	10 mg/mL
Retatrutide (20mg)	2 mL	10 mg/mL
Retatrutide (30mg)	3 mL	10 mg/mL
Retatrutide (60mg)	3 mL	20 mg/mL
Tesamorelin (10mg)	1 mL	10 mg/mL
Tesamorelin (20mg)	2 mL	10 mg/mL
Tesamorelin (5mg)	1 mL	5 mg/mL
Tirzepatide (20mg)	2 mL	10 mg/mL
Tirzepatide (40mg)	2 mL	20 mg/mL
Tirzepatide (60mg)	3 mL	20 mg/mL

These figures are laboratory preparation volumes; the calculator turns them into a concentration.

Where to buy it in Australia

Research suppliers stock bacteriostatic water, and some pharmacies do too; the common searches at Chemist Warehouse and Priceline usually come up empty. [Peptide Aus stock status for bacteriostatic water and syringes to be confirmed.]

Syringes

Insulin-type U-100 syringes are what laboratory handling uses to measure reconstituted solution, and the calculator reports the amounts in units for that syringe.