The GLOW protocol combines BPC 157, TB 500, and GHK Cu, three compounds often connected with skin support research. Each one has properties that may relate to renewal, recovery, and maintaining a healthy looking structure in controlled Effects of Copper Tripeptide on the Growth and Expression of Growth Factors by Normal and Irradiated Fibroblasts Jeffrey D. Pollard, Susan Quan, Thomas Kang, R. James Koch, 2005 The Science and Benefits of GHK Cu Peptide: Skincare, Hair Growth, and Beyond GHK Cu Focal Point Vitality GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link