@Sable-Darqness said in Pens with peptides that "sting"?:
I have noticed with the GHK-Cu that it never stung going in but about 15 mins to an hour after it was achey, a couple times it ached for a couple days
Same for me, don't experience a sting while going in, but I had 2 nights, at about 2 am, was woke up out of a deep sleep with a sting that came from the depths of hell, lasted until about 5! The devil incarnate, oof. I gave the Annela protcol a try and that has worked wonderfully, no sting since then(hope I'm not jinxing myself).