Have you had bad experiences with QSC or know someone that has?
I don't mind paying more to make sure I get what I am paying for. But, I don't have any way of knowing how any of the UG labs compare. I've used K4L in the past with no issues. So, at least in my limited experience, they seem good.
Appreciate any advice on choosing an UG lab.
I found a recent test from an independent testing agency
Quingdao Sigma Chemical QSC ratings: A-C. Based on 16 independent lab tests across 2 products. View detailed test results and safety data.
www.finnrick.com
Tirz seems legit.