Yeah, but it's not necessary at all. For instance, qingdao sigma chemicals (QSC), one of the more popular wholesalers atm, have been putting a ton of Primo 200 out to users and people aren't complaining about pip at all. Ofc the gear has been randomly and blindly tested multiple times by users. I'm not a fan of primo at all, so I don't follow it closely, in regards to which ugl's carry the 200mg's vials, but I've come across it sporadically from lab tested gear, that it doesn't cause That much pip if it's properly brewed. You can also always dilute it with test in the same syringe ofc ... But I pretty much dislike primo. Kills my libido and my wellbeing in a matter of days. It's also to noradrenergic for me, so sleep goes to chit and anxiety goes up. I used bold C in my cycle just a month ago and liked it much more, but it was comparably much more androgenic.