and their email rspns is actually amazing. I added on to my initial order Saturday eve (just added this morning) and they waived extra shipping, and are going to do all in 1 shipment. But they responded each time w/in 3 minutes (USA time!). very reassuring. I plan to take one vial from the shipment and get it tested before use, which is why I increased my order from 1 to 2 kits. Still a great deal overall. +the vendor said if results were not on target, they would reship, no cost. also very reassuring.