Besides price, is there a difference between the bulk VG from vape DIY online shop and what glycerin can be bought in a pharmacy or skin care area of a local shop? (USP and no other ingredients of course!) Just want to know if I can use a locally bought glycerin to dilute a juice that is nice but overpowering in flavor to me. I wouldn't mind if the nicotine is lower or even halved at all. I just have very acute olfactory and gustatory senses.