I've been using Certified Peptides for Retatrutide and a few mimetic HGH products like CJC-1295 and Ipamorelin. I don't have a lab to confirm quality but based on my 3-months of experience with the company, their "for testing purposes only" products seem to be legit. Especially the RETA product – it clearly works and seems to be from a good source. They're somewhat local to me (WA State) and I'm confident that they'll make me whole if there's ever a problem. There are several good peptide labs; this is one of them.