# Bacteriostatic Water and Compounded Peptides

Canonical source: https://retacompare.com/research/bacteriostatic-water-compounded-peptides-19

Compounded Peptides · 2026-03-26


    Bacteriostatic water (sterile water with 0.9% benzyl alcohol) is the standard diluent for multi-dose compounded peptide preparations because the preservative inhibits bacterial growth across repeated syringe entries. Single-dose preservative-free sterile water is used where a product must be preservative-free (for example, in pediatric or pregnancy applications, which are not relevant to GLP-1 compounds but matter in other peptide categories). The quality of the bacteriostatic water itself is a regulated variable; USP-grade, sterile, pyrogen-free water from an FDA-registered source is required. Counterfeit or relabeled bacteriostatic water has been identified as a contamination vector in several 2025–2026 adverse event investigations.


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