I purchased my PG from Essential Depot on Amazon - have not had any issues with it - got my initial VG from them too, also decent, but started getting my VG from nudenicotine, same place I get my nic base... I have a feeling that first bottle of PG is going to last me a LONG time, as I am generally mixing at 70 or 80% VG and majority of flavors seem to be PG based, so I end up adding very little PG to recipe