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 →
Bacteriostatic preservative & co-solvent for reconstitution
Overview
Benzyl alcohol (C7H8O) is a simple aromatic alcohol used across the peptide workflow as an antimicrobial preservative and mild co-solvent. Its best-known role is as the 0.9% preservative in Bacteriostatic Water for Injection, where it suppresses microbial growth and lets a reconstituted vial be drawn from repeatedly over a working period rather than discarded after first use. It also serves occasionally as a small-fraction co-solvent to help bring poorly-soluble small molecules into aqueous vehicles. PeptideXpo supplies pharmaceutical-grade benzyl alcohol as a clear liquid for laboratory reconstitution and formulation work. It is not appropriate for every peptide: benzyl alcohol can interact with certain sequences, and preservative-free sterile water remains the correct diluent whenever a single-use preparation is required. Supplied in 3 mL and 10 mL fills as a research and compounding reagent, not for human or veterinary use.
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: academic and contract research laboratories.
Specifications
Documentation available on request
Regulatory note
Supplied as a research / compounding reagent; not for human or veterinary use. Preservative selection is the buyer's responsibility against the destination workflow.
Selected literature
Frequently asked questions
Bacteriostatic water (0.9% benzyl alcohol) is the practical choice when a reconstituted vial will be accessed multiple times over a working period — the preservative suppresses microbial growth between draws. Preservative-free sterile water is the correct diluent for single-use preparations, for workflows where benzyl alcohol is contraindicated, or where the peptide is known to be sensitive to the preservative. The two are not interchangeable in every context; match the diluent to the workflow.
For most short peptides at the standard 0.9% bacteriostatic concentration, benzyl alcohol is well tolerated over a normal working window. But some sequences — and some conjugated or lipidated peptides — interact with the preservative or with the trace benzaldehyde it can form on oxidation. For a sensitive or high-value peptide, use preservative-free sterile water and prepare single-use aliquots.
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