Peptide Injection Site Reactions: What's Normal, What's Not, and What Revolution Health & Wellness Subcutaneous Injection: What It Is and How to Give One 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 Peptide Therapy for Pain Management and Healing Core Medical & Wellness Figure 2 from GHK Copper Peptide in Skin Remodeling and Anti Aging ! GHK Cu in Skin Remodeling Semantic Scholar