The Nic Select they sell is a line of Nic that many E Juice manufacturers use.....They are simply a distributor.....Google NicSelect......Can't speak to their USA Nic.........PG I believe is a PG made by the Dow Corporation.....it is pretty clean in my experience.....Their VG is a Palm based VG, as opposed to a Soy based VG........Some High end juice makers claim that palm based VG is far superior to Soy based VG, so they incorporate it into their Juice lines.......In my experience, it is very smooth.......with a bit more sweetness to it, than say, Essential Depot or Bulk Apothecary VG........If you taste the PG on your finger you will get that semi-bitter flavor that is characteristic of PGs (despite claims that PG is tasteless)......Thing with this taste, however, is that it is not overbearing and is sort of a "focused" singular taste, as compared to lesser quality PGs which in comparison, have that taste, but all over the mouth "tingling" sort of sensation, with a slight harshness......I like the PG from Liquid Barn..........Tasting the Liquid Barn VG, you will notice that characteristic sweetness, BUT, it is a little bit more in sweet taste than the average Soy based VGs out there...........Also, it has more of a uniform, singular taste note to it, much as the Liquid Barn PG..........LBs VG is excellent in dessert vapes........however in standalone fruit mixes, I believe that it imparts a slight "taint of sweetness", which the fruit really picks up........It's not overbearing, but it is definitely present in the flavor of fruits..........I have a couple of Liquid Barn flavors in steep currently........Rainbow Sherbet (has alcohol) and Pacific Cooler...... I think I am gonna like the Pacific Cooler, but am not sure about the Rainbow Sherbet, as I am uncertain of how to deal with flavors with alcohol.....Make sure to check the flavor bases for those Liquid Barn flavorings for PG vs VG percentages prior to mixing or putting them into your recipe program, as they are not all 100% PG based.......As far as Diacetyl, Acetoin, and other chemicals, be sure to research what they do or don't contain ......Hope this helps