If GHK Cu has ever made you question your life choices mid injection I've been there That burning sensation is common but here's what helped me: Use a inch needle ( GHK CU, Why this audio? Because injecting feels like a constant wasp sting so it takes me about 15 seconds to pin .2 mL. I dread this shot every night for that reason. Also, it leaves me bruised, so I Rejuvenation and Youth with GHK Cu Peptide Treatment Dr. Ahmet zyigit Wellness peptide craze: Why people are injecting drugs 'not for human consumption' AOL Subcutaneous Injection Sites and Instructions for Safe Self Administration Amazon.com: GHK Cu Copper Peptide Serum Anti Aging Face Serum for Skin Firming, Wrinkle Reduction, Hydration & Collagen Boosting, 30ml(1 fl oz) : Beauty & Personal Care