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Solvents and diluents used to dissolve lyophilized research peptides before use. Not peptides themselves — the fluid that turns the vial powder into an injectable solution.
Research peptides ship as lyophilized (freeze-dried) powder in sealed glass vials. To deliver a measurable dose, the powder has to be reconstituted — dissolved in a compatible liquid — and the choice of diluent determines both the stability and the shelf life of the finished solution.
Bacteriostatic water is the standard diluent for the vast majority of peptides. It is sterile water preserved with 0.9% benzyl alcohol, an antimicrobial that prevents bacterial growth without killing cells outright. The preservative is what makes multi-dose use practical: a reconstituted vial can sit refrigerated and be drawn from across a 28-day dosing window without contamination risk. BPC-157, TB-500, the GLP-1 class, the GHRP family, sermorelin, and most of the rest of the catalog reconstitute cleanly in bacteriostatic water.
Acetic acid water — typically a 0.6% dilution in sterile water, pH around 3 — is the specialist solvent. Some peptides are poorly soluble at neutral pH and either refuse to dissolve or form a cloudy suspension in bacteriostatic water; the classic examples are GHK-Cu, AOD-9604, IGF-1 LR3, and GHRP-2 / GHRP-6. A mildly acidic environment protonates the peptide and restores solubility. If a peptide reconstituted with bacteriostatic water is still cloudy after gentle swirling, acetic acid water is the next step.
Both are research-grade reagents, not injectable pharmaceuticals. Vendors stock them alongside peptide inventory because running out of either one mid-study is common enough that most researchers buy them on the same order as the compound they plan to dissolve.