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 The Difference Between PG and VG Eliquid Vapemate VG vs PG: What's the Difference? RED Box Vape Red Box Vape VG vs PG: What's the Difference? RED Box Vape Red Box Vape VG and PG in E Liquid: What Are They?