VG vs PG What are They and the Key Differences Between the Two? How to Choose the Best Ratio for Vaping Are vape concentrates PG or VG? VG PG Ratio Explained: Choosing the Right Vape Juice for Your Kit VSAVI E Liquids Vape Kits The PG (Propylene glycol) and VG (Vegetable Glycerin) are the two primary base ingredients of eliquid. They are all FDA approved and are equally safe. The PG is a clear, colorless liquid