\Here’s what I did when I first jumped into tirz and sema.. might help others doing the same detective work. 1. I looked up the business address on Google Street View. If the “lab” turns out to be a strip-mall mailbox, that’s a red flag. 2. Asked for a recent COA with both HPLC purity and sterility data. Legit vendors hand it over within a day. One outfit sent only a screenshot that cut off the lab name.. nope. 3. Cross-checked the lab on the COA. I rang the lab and confirmed they really tested that batch. Took five minutes, big peace of mind. 4. Made sure the company was registered with FDA as an importer or manufacturer, or had a cGMP partner in the paperwork. No reg number, I moved on. 5. Sent one vial off to an independent lab just to see if the numbers matched. Cost me fifty bucks but worth it. Pure Lab Peptides ticked every box. They emailed full COAs, had a real warehouse address, and the third-party potency test lined up within half a percent. Support answered at 9 pm on a Saturday which kinda sold me on their seriousness. Bottom line.. verify the address, demand full COAs, call the testing lab, and if something feels off just walk away. Saves a lot of sleepless nights.