The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline Why do glow peptides burn or sting after injection?, If youre using GHK Cu, BPC 157, or TB 500 for skin health, hair, or tissue repair, this is a common question and usually not a problem., Glow 7% GHK CU ACCELERANT Platinum Skin Care Injectable GHK Cu: Beginner's Guide to Copper Peptide If your GHK injection site gets irritated try this , 1. Dilute it by adding more water to the syringe , 2. Let it sit until it reaches room temperature , Also, make sure youre rotating injection