I do this for all of my peptides. Going to try a new company out soon for Ipamorelin. However, in order to play ball with these guys I have to purchase 50mg bulk amounts
Either way, I feel pretty good about it because they provide a number of products for Pfizer.
It's trickier with peptides other than GH though. Timing is really key and a megadose + a solid, carb-laden meal is necessary literally just an hour before going in for tests. The good thing here is that during all of the processes involved for testing peptides, the most constant and consistent process is LabCorp. I literally get in and out in 10 minutes or less, which is good for these types of studies.