I've been using USP test and Deca a good majority of the cycle, definitely good gear, but I only had one contaminated vial (10ML) before this. Previously I have injected contaminated gear and it left a little bump/scar in my delt. Is it visible, no, can I see it and feel it yes most definitely. Although the gear is AMAZING, and my test levels are ABOVE AND BEYOND... I still dont want little hairs in my gear, personally. I emailed DomesticX, as I purchased it from them, SUPER FAST SHIPPING! (2 business days) and they delivered, however I wasnt happy about the hairs in the vial. I emailed them, i'll see their response, but so far it's a top notch team they have. Just frustrated with hairs/fibers/ whatever in my vial. I've used a ton of sources such as sacro, USP (of 12 vials only 1 black thing i posted previously) lixus, Abs (of 10 vials 1 hair), arl , myobolix and pharma gear, and only twice have I had contaminated gear. Call me stingy, but there are UGL's that are flawless, thats why I thought it was important to bring this up. I've opened the vial and tried to suck the hairs out into the vial, but I just cant do it. (sorry for any typos, mobile here)