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The rationale is inferential: GHK-Cu supplies matrix and collagen effects that the others do not
Replace these with sulfur rich whole foods such as garlic, onions, broccoli, Brussels sprouts, kale, eggs, and grass fed protein, all of which provide the cysteine and selenium your body uses to build glutathione naturally (PubMed PMID: 32213639)
Counteraction of Perforated Cecum Lesions in Rats: Effects of Pentadecapeptide BPC 157, L-NAME and L-Arginine
All usage described here is for research purposes only and is based on published studies, laboratory protocols, and anecdotal reports from the peptide research community