The "Million Dollar Question" right there..... When I pay domestic vendor prices, me personally I'm factoring in that there already exists a testing regimen that allows me enough comfort in the product to not conduct my own testing. But..... I've only bought from PGB here domestically, and while I have serious issues with their current test results/refund policy, they do have a fairly robust testing program in place that includes multiple rounds of both PGB and customer volunteer vials. I pin their product without my own testing. I don't know if Nexaph has anything similar, but if they don't, I see zero reason to buy from them over direct from China other than slightly less hassle.