Dissolving a freeze-dried peptide powder in sterile water to produce an injectable solution — the step that converts what arrived in the vial into what goes in the syringe.Inject bacteriostatic water slowly down the side of the vial — not directly onto the powder — and allow to dissolve without agitation. Do not shake; swirl gently if needed. The volume of bacteriostatic water you add determines the resulting concentration, which determines the injection volume per dose. Calculate this carefully before drawing up a dose. Reconstituted peptides should be stored refrigerated (2–8°C / 35–46°F) and used within the timeframe recommended for that compound (typically 2–4 weeks for bacteriostatic water reconstitutions).