Attention all vape enthusiasts: if you are on the hunt for vape juices, you will notice different ratios for “VG” and “PG” in the descriptions. So what does this ratio mean? What is PG and VG? First and foremost, PG stands for “propylene glycol” and VG stands for “vegetable glycerin”. PG and VG are liquid ingredients used in vape juice, which can be combined with differing levels of nicotine. These two ingredients are combined in various ways on e-juices to suit each vape user's preferences.