Bac Water

Bacteriostatic Water (Bac Water) is a research-grade sterile water preparation containing 0.9% benzyl alcohol as a bacteriostatic preservative. Researchers use it as the standard reconstitution solvent for the majority of lyophilized research peptides — including GLP-1 agonists, GHRH analogues, GHRPs, cytoprotective peptides, and cognitive research compounds. Furthermore, the 0.9% benzyl alcohol preservative inhibits microbial growth, allowing multi-dose use of reconstituted peptide solutions without compromising sterility. Available in 3ml and 10ml vials.

For research use only. Not intended for human or veterinary administration.

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Bacteriostatic Water — Standard Peptide Reconstitution Solvent

Bacteriostatic Water is a sterile aqueous solution containing 0.9% benzyl alcohol (w/v) as a bacteriostatic preservative. It represents the most widely used and recommended reconstitution solvent for lyophilized research peptides across all categories — from metabolic and growth hormone compounds to recovery, cognitive, and longevity research peptides. Researchers use bacteriostatic water for peptide reconstitution because its benzyl alcohol content inhibits bacterial growth in opened, multi-use vials, maintaining the microbiological integrity of reconstituted peptide solutions across multiple experimental sessions.

Why Bacteriostatic Water for Peptide Reconstitution?

Most research peptides are supplied as lyophilized (freeze-dried) powders that require reconstitution with an appropriate aqueous solvent before use. Bacteriostatic water is the preferred reconstitution solvent for most peptides because it offers three key advantages over plain sterile water.

Microbial inhibition — The 0.9% benzyl alcohol content inhibits the growth of bacteria, fungi, and other microorganisms that could contaminate reconstituted solutions upon repeated vial access. As a result, reconstituted peptide solutions remain microbiologically stable across multiple experimental sessions when stored at 4°C.

Isotonicity — Bacteriostatic water is formulated at near-physiological osmolarity, making it compatible with most peptide stability profiles and cell culture experimental systems.

Compatibility — The vast majority of research peptides in this catalog — including GLP-1 agonists, GHRH analogues, GHRPs, BPC-157, TB-500, Semax, Selank, and many others — reconstitute cleanly and stably in bacteriostatic water without precipitation, aggregation, or activity loss.

Reconstitution Best Practices

Add bacteriostatic water slowly along the inner vial wall of the lyophilized peptide vial — never inject directly onto the lyophilized powder cake, as this can cause local denaturation. Gently swirl the vial until the powder fully dissolves. Do not shake or vortex. Store the reconstituted peptide solution at 4°C and use within the researcher’s validated timeframe — typically 28–30 days for most peptides. Additionally, prepare single-use aliquots of reconstituted solution before storage to avoid repeated vial puncture and minimize contamination risk in longer experimental programs.

Which Peptides Use Bacteriostatic Water?

The following peptides from this catalog reconstitute with bacteriostatic water as the standard solvent: all GLP-1 compounds, Cagrilintide, AOD9604, MOTS-C, all CJC-1295 variants, Sermorelin, Tesamorelin, GHRP-6, Hexarelin, BPC-157, TB-500, BPC+TB Blend, KPV, Thymosin Alpha-1, Semax, Selank, Kisspeptin-10, PT-141, Epitalon, FOXO4-DRI, Snap-8, Mazdutide, and most other peptides in this catalog. Peptides requiring acetic acid for initial solubilization (IGF-1 LR3, Melanotan I & II) are noted specifically in their individual product reconstitution guidelines.

Product Profile

Storage Conditions

Store bacteriostatic water vials at room temperature or refrigerated (2–8°C). Protect from freezing and direct sunlight. Once opened, vials remain microbiologically stable for up to 28 days when stored appropriately. Furthermore, discard any vials showing visible particulates, cloudiness, or discoloration before use.

For research use only. Not intended for human or veterinary administration.