Bacteriostatic Water for Peptides

Bacteriostatic water contains 0.9% benzyl alcohol, which prevents bacterial growth. Sterile water for injection doesn't. That's the entire difference, and it determines how long your reconstituted peptide survives.

BAC water vs sterile vs saline

Bacteriostatic (BAC): Sterile water + 0.9% benzyl alcohol. Suppresses bacterial growth. Good for 90 days after opening. This is the standard for peptides.

Sterile water: No preservative. Sterile only until first puncture. After opening: single use only. Not suitable for multi-dose vials.

Saline (NaCl 0.9%): Used for some medications, but not typically recommended for peptides. Salt can affect stability of certain peptides.

How to reconstitute

Draw BAC water into syringe. Slowly inject along the vial wall. Don't squirt directly onto the powder. Gently swirl the vial, don't shake. Clear solution with no particles = correct.

How much water to add

Depends on desired concentration. Simple math: 2ml BAC water into 5mg peptide = 2500mcg/ml. On a 100-unit insulin syringe: 10 units = 250mcg.

[[Bacteriostatic Water|30]] is available ready to use. Store opened at 2-8C, use within 90 days.

Questions about reconstitution? Reach out.

This article is for educational purposes. Peptides are intended for research use. Consult a healthcare professional before starting any protocol.