1. Wang L, et al. Overview of Peptides and Their Potential Roles in Skin Health and Beauty. J Pept Sci. 2025 Feb;31(2):e3668. 2. Tosto R, et al. New Biotinylated GHK and Related Copper(II) Complex: Antioxidant and Antiglycant Properties In Vitro against Neurodegenerative Disorders. Molecules. 2023 Sep 20;28(18):6724.