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That said, it remains the only head-to-head comparison available, and GHK-Cu won on the metric that was measured

Available at: 56 World Anti-Doping Agency (2024c)

For the diluent side of this equation how much bacteriostatic water to add and why benzyl alcohol matters for a multi-dose vial see our dedicated bacteriostatic water reconstitution guide

This is less of an issue with sealed vials but is still a consideration

In bacteriostatic water peptide science, it is the standard diluent because its bacteriostatic properties extend the shelf life of reconstituted peptide solutions, reduce contamination risk, and preserve peptide activity across repeated withdrawals

Third-party testing provides some assurance of purity and identity