Test vial labeling and batch info is my litmus test - the sketchy ones got vague when I asked, while the one I've stuck with through my 37 lb loss had clear answers ready before I even asked. Also worth noting how they handle a problem order, not just a smooth one.
Trustworthy Supplier
Only 7 lbs in myself so take it for what it's worth, but I already got burned once by a source that had zero paper trail on handling. Payment method matters too - the one that pushed me toward friends-and-family only was the same one that ghosted. Now I treat how they respond to a complaint as the real test.
Down 33 lbs across two sources and the biggest one for me was shipping speed consistency - my good one had the same turnaround whether it was my first order or my fourth. The bad one got slower every time. Also learned to save screenshots of everything from day one.
I think trust comes down to consistency, transparency, and communication. A good supplier should provide batch-specific COAs, independent testing when available, and clear information about product specifications. Price matters, but reliability and traceability are just as important. What do you guys usually look for first?
I'm familiar with the supplier side of the industry, and I think transparency and verifiable quality documentation are key. It's important to ask questions and verify claims before choosing any supplier.
Biggest lesson from my two sources: how they handled a problem order said more than the good orders did. The one I trust fixed a short shipment in days without me chasing them, and that matched what the shipping consistency crowd here is saying. Also second the screenshot habit - I date-stamp everything now.
Down 16 lbs on my current vials so quality clearly mattered for me. The thing that sold me on my source was how fast they answered a question about storage before I ever ordered - if they're responsive pre-sale, that's usually a good sign. One bad sign I learned the hard way: anyone pushing you to order big quantities upfront.