I've been buying PG/VG from same guy for about 3 years and happy with it. But this time I bought it of Ebay so I saved $20. It was a combo 2x 1L PG/VG USP grade. I made my normal mix but it tastes harsh and strong flavored, not very mouthful, as if I had too much PG in the mix. I can even taste cotton on my coil which normally I don't. I made 1/2 Liter of the stuff :-( I'll have to buy from my dealer after all and dump this. So my questions is about types of VG, I believe some is made from soy and some from palm. I have no idea which type I normally vape. And what about PG, is that all the same or it can be different as well? I could just buy my favorite VG from me dealer so I don't waste the PG I all ready got. Thanks for any advice.