GHK Cu might be trending, but it's not new. Before you inject yourself with this viral peptide, consider this. This copper peptide has been studied for years in skin repair and collagen signalling, Is GHK Cu a Promising Path to Better Healthspan and Longevity? by Peter Marino, M.S. CHC CPT Medium Copper, Collagen, and Controversy: Inside the GHK Cu Buzz Can You Use GHK Cu Peptides with Vitamin C Serum? Expert Guide
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ghk-cu tolerance or desensitization or loss of effectiveness long-term use Frontiers