ghk-cu stretch marks study Does ghk cu serum really work? looking skin How GHK-Cu Tightens Loose Skin:

This protein, Body Protection Compound, is vital for normal gastrointestinal tract functioning, and its primary function is to heal and protect the GI lining

Because GSH status is dynamic, the outcome measures were extended beyond GSH status alone to include 8-OHdG and F2-isoprostanes (F2-isoP), in case a change in oxidation status was exemplified by evidence of reduced oxidation products rather than a change in GSH or GSH:GSSG ratio (i.e., improvement in tissue-level oxidative stress not represented by RBC indices)

and Shirota, H

GHK Peptide Inhibits Bleomycin-Induced Pulmonary Fibrosis in Mice by Suppressing TGF1/Smad-Mediated Epithelial-to-Mesenchymal Transition.[J]