Unopened bacteriostatic water can be kept at room temperature for up to 2 years from the date of manufacture and should be discarded by its expiration date.

Once a vial of bacteriostatic water is opened, date it and discard any remaining fluid after 28 days or sooner, or if the solution becomes cloudy, discolored, or otherwise compromised.

USP <797> “Sterile Compounding” sets a default beyond‑use date (BUD) of 28 days for any multi‑dose container that contains an antimicrobial preservative. The CDC safety guidance adopts the same limit.

Bacteriostatic water qualifies because it contains 0.9 % (9 mg mL‑1) benzyl alcohol. The preservative slows, but does not stop, microbial growth. So its effectiveness drops with each entry.

We recommend storing our sterile lyophilized (freeze-dried) peptides in the freezer. To reduce moisture contamination during storage, our peptides are either packaged vacuum sealed or nitrogen filled. The protective vaccum may result in challenges removing reconstituted peptide from the vial.

Once peptides are to be used, bring them up to room temperature before reconstitution with your lab reagents or solvents.

Once the sterile peptide is reconstituted, store in the refrigerator at 2 – 8 °C (above freezing).