Before you decide to begin using the copper peptide, GHK Cu, be aware it stings and leaves behind big, red welts that then leave a lovely bruise. , In order to reap the glow benefits, you need to 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 GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B Injection Site Redness ChemoExperts A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend