What's on the label is the measured result — net peptide mass, not gross powder weight, plus RP-HPLC purity, on a lot-numbered COA for every batch.
Net peptide mass and RP-HPLC purity — a lot-numbered COA for every batch.
Net peptide mass + HPLC purity, per lot.
PCAC will review 7 peptides for the 503A bulks list, BPC-157, KPV, TB-500, MOTS-c, Emideltide, Semax, Epitalon. Read our briefing →
PCAC will review 7 peptides for the 503A bulks list. Read →
FDA PCAC reviews 7 peptides in July. Read →
0.9% benzyl-alcohol bacteriostatic water
PeptideXpo buyer fit
This PeptideXpo page is intentionally positioned for distributors, OEM buyers, and procurement teams comparing BAC Water (Bacteriostatic Water for Injection) inside a wider peptide catalog. It is not trying to be the deepest single-molecule monograph; the differentiated intent is assortment planning, export-ready documentation, fill-size comparison, and whether this SKU belongs in a broader buyer program.
Overview
Bacteriostatic Water for Injection (BAC Water) is sterile water containing 0.9% benzyl alcohol as a preservative, supplied as a multi-use reconstitution diluent for peptide and other injectable preparations. The benzyl-alcohol preservative inhibits microbial growth in the reconstituted vial after the rubber septum has been pierced multiple times, supporting multi-dose use over the typical 28-day window after first puncture (the standard USP-compendial expectation for preserved injectable solutions). For peptides where preservative compatibility is documented, BAC Water is the workhorse diluent for both compounding pharmacy and med-spa workflows because it allows a single vial to support many small doses over a multi-week period. PeptideXpo supplies BAC Water in 3 ml and 10 ml sterile vial formats, prepared from pharmaceutical-grade benzyl alcohol and Water for Injection. Buyers should note that BAC Water is not universally compatible with all peptides, some short peptides interact with benzyl alcohol or the preservative system, and the recommendation for those is to use preservative-free Sterile Water for Injection (SWFI) instead with single-use aliquot preparation. The product label and COA always document the benzyl-alcohol content explicitly.
Who buys this, and why
Custom-blend buyers are almost always OEM clients building a branded product around a specific ratio of two or more peptides. The development workflow is collaborative: ratio target, analytical method to verify it, stability protocol in the chosen carrier, and packaging selection are all defined in the OEM brief before the first commercial run. Sample-stage volumes are usually 5-10 g of finished blend; commercial MOQ depends on the components.
Primary buyer fit: 503A / 503B compounding pharmacies, medical aesthetic clinics and med spas, and regional distributors and re-sellers.
Specifications
Documentation available on request
Regulatory note
Reconstitution diluent containing benzyl-alcohol preservative. Verify sterility, endotoxin, and injectable-grade compliance with target market regulations. Not universally compatible with all peptides, some peptides require preservative-free SWFI.
Frequently asked questions
Use **BAC Water** when the peptide is preservative-compatible and the workflow benefits from multi-use vial preservation, typical case: a compounding pharmacy or med-spa preparation where a single vial supports many small doses over 2-4 weeks. The 0.9% benzyl alcohol prevents microbial growth in the vial after multiple septum punctures. Use **Sterile Water for Injection (SWFI)** when the peptide is preservative-incompatible (some short peptides interact with benzyl alcohol), when the preparation is intended for single use within hours of reconstitution, or when the downstream product requires preservative-free chemistry (some sterile-filled finished products). The PeptideXpo product page or COA specifies the recommended diluent per SKU.
The 28-day window is the USP-compendial expectation for preserved injectable solutions and is the conservative operational guideline most compounding pharmacies use. The actual stability depends on the specific peptide and the storage conditions of the reconstituted vial, peptides with shorter aqueous-solution half-lives may need shorter use windows (7-14 days), while particularly stable peptides may tolerate longer (4-6 weeks). The 28-day default is appropriate for the majority of GLP-1, repair, and GH-axis peptides reconstituted in BAC Water and held refrigerated. Stability data on the specific peptide-in-diluent combination can be developed as part of the OEM service for buyers building extended-stability finished products.
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