GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? 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 If youre using GHK Cu and it stings a little (which is common) this ones for you , In this reel Im sharing the small tweaks that have helped me make peptide injections way more comfortable Suppstance The reviews are in and GHK CU is changing the game. From athletes recovering faster to everyday members saying goodbye to joint pain and Instagram