ghk-cu peptide functions as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications | Systems Microbiology and Biomanufacturing Copper peptide GHK-Cu - Wikipedia
Description
Ignoring ingredient interactions Combining copper peptides with certain ingredients at inappropriate times can cause irritation that seems like concentration intolerance
For gut-specific use, oral may be adequate

The therapeutic direction in this pathway is inhibition, not activation

& Malberti, F

Eur J Pharmacol 112:127128 Sikiric P, Geber J, Ivanovic D et al (1986) Dopamine antagonists induce gastric lesions in rats
