I always read "i will test it for you" or "i will buy and test it"
And then they start to just take it?
This is NOT a test...
Do you guys or girls test the stuff what you order. And i mean test it in a Laboratory?
Dann weisst du auch nie was du zu 100% hast
After a while, you kind of know what you have. You just need to experiment, test different sources and you will definitely know the difference. Also, for the most part I have used a site where admins randomly verify the quality of vendors' offerings and many of these vendors publish lab results. If you make smart purchases, there's basically no need to worry