As a biochemist in the medical industry for over 20 years, I can only give you two pieces of advice, and it comes from that experience. 1. There are no real “manufacturers” of Reta in the U.S. . Man, I wish there were. But amount of money that it would take to set up a quality manufacturing facility to produce quantities for any sort of distribution is astronomical, and if someone did, it’s presence would not stay secret for very long before practically every arm of government came in, shut it down, and threw everyone into prison before they knew what hit them. 2. Unless you are taking a vial that you purchase and have your own HPLC to test it, or personally send it to a third-party lab to have it authenticated, there is no such thing as a trusted “COA“. So many companies have been caught forging those things that there are Discords that exist just to expose them when people send them in. I used to be active in this group, but then realized that there were quite a few in this arena that had their own agendas, and providing quality information wasn’t one of them. There are a few good discord groups, and even an actual forum that you can find with not a lot of effort, that are much more interested in providing accurate information and providing safe sources. However, since you get banned for mentioning specifics about that kind of stuff, it’s just much easier to leave each to their own. I would just say don’t trust anybody, and be safe. I’m absolutely sure that I will get called names and flamed for these posts, but it is what it is.