Bacteriostatic Water: 20mL

Bacteriostatic Water-(BAW) offers several key advantages over Sterile Water For Injection-(SWFI) when it comes to peptide reconstitution. The primary benefit is its ability to be used multiple times over long durations after opening, thanks to the addition of 0.9% benzyl alcohol. This preservative inhibits bacterial growth, making BAW ideal for multi-dose applications. In contrast, sterile water is intended for single use only and must be discarded immediately after opening, even if only a small amount is used.

Another major advantage is the extended shelf life of reconstituted peptides when using BAW. Peptides mixed with bacteriostatic water can often be stored in the refrigerator for up to 16weeks, maintaining their stability and potency(depending on the peptide). With sterile water, the reconstituted solution typically must be used within 24 hours or less, which can lead to increased waste and rapidly diminishing potency—especially for users administering low doses or following long-term peptide cycles.

Cost efficiency is another reason BAW is preferred. Because it allows for multiple uses, one vial of bacteriostatic water can reconstitute several peptides, reducing the need to purchase multiple vials. This is not only more economical but also minimizes unnecessary waste. Furthermore, the presence of benzyl alcohol significantly reduces the risk of contamination from repeated needle entries into the vial, a critical safety feature not offered by sterile water.

While BAW is compatible with the vast majority of peptides and helps maintain peptide integrity under proper storage conditions, it is important to note that it should not be used in neonates due to the potential toxicity of benzyl alcohol. Additionally, a small subset of sensitive peptides may degrade more rapidly in alcohol-containing solutions, although this is rare.

Overall, bacteriostatic water is the superior choice for peptide reconstitution in most research and clinical settings. Its multi-use capability, extended storage life, cost effectiveness, and improved safety profile make it a practical and reliable option compared to sterile water.