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(Frontiers in Pharmacology, 2022) reported pharmacokinetics and tissue distribution in rats and dogs, including a rapid plasma half-life under 30 minutes after IM or IV dosing

Without direct tissue quantification, it is unknown if the CNS exposure was high, or if the large systemic dose simply compensated for low anatomical delivery efficiency across the nasal mucosa

Reszko says

If it does, you may have copper sensitivity

However, GHK-Cu may also unrelated to its copper-binding capacity upregulate and downregulate a number of genes that play roles in skin repair, healing, and blood vessel and nerve growth [3]

Delta sleep-inducing peptide (DSIP) is a nonapeptide with the sequence Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu