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Copper peptides are naturally occurring in human plasma

Not during reconstitution, but during the drawing process

Targeted PubMed searches yielded 14 high-quality references, including clinical trials and mechanistic studies, supplemented by 4 authoritative sources due to the niche nature of recent systematic reviews on copper peptide GHK-Cu

Safety and side effects: A meta-analysis of multiple studies in COPD patients showed no significant adverse effects at doses ranging from 600 mg to 3g/day.[ref] Studies in healthy adult athletes go up to 20g/day (not recommending this, just including it for safety).[ref] Conversely, in Parkinsons patients, there was a high number of adverse events at 6g/day of NAC

However, bacteriostatic water remains a popular choice due to the added preservative

Oysters, red meat, chicken, beans, nuts, and whole grains are healthy food sources of zinc