Redness after a peptide injection can feel alarming but in most cases, its completely normal. , If youve noticed a pink or red halo at the injection site especially with peptides like GHK Cu Injection site irritation : r PeptideGuide GHK Cu Copper Peptide Benefits, Uses & Safety Intra V GHK Cu Peptide The benefits, side effects, and more [2026] Hard Lump Under Injection Site: Treatment, Causes, and More MyEczemaTeam Figure 2 from GHK Copper Peptide in Skin Remodeling and Anti Aging ! GHK Cu in Skin Remodeling Semantic Scholar