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Protein disulfide isomerase and glutathione are alternative substrates in the one Cys catalytic cycle of glutathione peroxidase 7
Pricing Comparison The structural and manufacturing differences translate to pricing: GHK-Cu is one of the more affordable peptides in the catalog due to its simple three-amino-acid structure and well-established manufacturing BPC-157 is mid-range pricing more expensive per mg than GHK-Cu but less expensive than the highly modified metabolic peptides For broader pricing context, see Peptide Pricing in Canada: What Drives Cost and How to Evaluate Value
Its confidence interval spans zero and is wider than the point estimate, so it was too small to detect the difference it observed uninformative rather than null
