10ml bac water Buy Bacteriostatic for Peptides (BAC Water) Transparent visibility with high Bacteriostatic Water 3ml/10ml | Research

Some more sensitive compounds don't tolerate the benzyl alcohol preservative well and are better suited to preservative-free sterile water or saline, even though this typically means the reconstituted solution should be used sooner rather than stored for weeks

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Often injecting it slowly can reduce any irritation

Petersen, M

Quick Reference: Protocol Community-reported AHK-Cu use centers on a topical serum applied to the scalp (for hair interest) or skin (for the copper-peptide skin properties extrapolated from GHK-Cu)