★ Ancillary

Acetic Acid Water

Ancillary · 3ml/vial × 10

0.6% acetic acid solution for reconstituting peptides that do not fully dissolve in bacteriostatic water.

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Overview

What Is Acetic Acid Water?

Acetic acid water is 0.6% glacial acetic acid in sterile water, a low-pH diluent (approximately pH 3.0 to 3.5) used to reconstitute peptides that do not fully dissolve in neutral solvents. Peptides rich in hydrophobic residues (leucine, isoleucine, valine, phenylalanine), or with an isoelectric point near physiological pH, tend to aggregate, gel, or remain cloudy at neutral pH. Lowering the solvent pH below the peptide's isoelectric point protonates acidic residues, gives the chain a net positive charge, and the resulting electrostatic repulsion breaks up aggregates and pulls the peptide into solution.

The 0.6% concentration is the laboratory standard because it is acidic enough to solubilise difficult peptides while remaining well below the threshold for meaningful acid hydrolysis of the peptide backbone over a typical multi-week storage window. Acetic acid water contains no benzyl alcohol or other preservative. The low pH is mildly bacteriostatic on its own, but an opened vial does not carry the extended multi-puncture storage window that bacteriostatic water provides. In laboratory practice it is commonly used to dissolve the peptide in a small initial volume before diluting to working concentration with bacteriostatic water, or as the sole solvent for solutions that will be aliquoted and frozen.

Published Safety Data

What the published studies measured.

What the studies show

Measured in clinical trials

No clinical RCT data exists for 0.6% acetic acid as an injection diluent specifically, this is an off-label compounding convention rather than an FDA-approved diluent. The acetic acid itself is GRAS (generally recognized as safe) for ingestion at much higher concentrations and is well-tolerated at the 0.6% concentration used here.
Injection site sting: documented in compounding literature when peptides are injected at low pH directly (without BAC topup). The sting is the pH, not toxicity, and resolves in 30-60 seconds. The fix is the two-step recon so the final injected solution sits closer to neutral pH.
Acid hydrolysis of the peptide backbone: theoretically possible at very low pH over long storage windows, in practice negligible at 0.6% acetic acid and refrigerated short-term storage. Frozen aliquots avoid the issue entirely.
Allergic reaction to acetic acid: not documented, acetic acid is a normal metabolic intermediate in human biochemistry.

Reconstitution & Storage

Storage: Unopened acetic acid water vial: room temperature, stable until printed expiration (typically 1-2 years from manufacture). Punctured acetic acid water vial: refrigerate, use within 7-10 days for the bulk vial. The acetic acid itself is shelf-stable but with no preservative the practical window collapses fast once a needle goes through the stopper. Reconstituted peptide solution in acetic acid water: 48-72 hours refrigerated for the pure-acetic-acid recon, 2-3 weeks if the two-step method was used (small acid volume plus BAC water topup, the BAC's benzyl alcohol carries the preservative window). For longer storage, aliquot into single-dose tubes and freeze, peptides in acetic acid solution generally freeze well at -20C for several months.