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The histidine residue serves as the primary copper-binding site through its imidazole ring, creating a stable square-planar copper(II) complex with the amino terminal and adjacent peptide nitrogen atoms

So if your skin is fairly okay condition already, you won't see much of a difference with the 5% (unless your skin realllly needs extra extra help) but the 1% works perfectly for over time results to maintain

Professor Goldsteins research contributions include: Co-discovery and isolation of the thymosin family of peptides in the 1960s First clinical trials of thymosin preparations in immunodeficient children (1974) Characterization of thymosin beta-4s actin-binding and wound healing properties Development of therapeutic applications for tissue repair and regeneration Over 450 published scientific articles and 25+ patents related to thymosins Leadership in translating thymosin research toward clinical development Disclaimer: This spotlight is provided for educational purposes to acknowledge scientific contributions to BPC-157 and TB-500/thymosin beta-4 research

Balamurugan, K