Petrolatum

The most effective occlusive agent in skincare — reduces TEWL (transepidermal water loss) by 99% vs glycerin's 20–30%. The "slugging" trend in the 4th Wave — applying a thin layer of petrolatum as the final PM step — drove global demand for Korean Vaseline and petroleum-based balms. Non-comedogenic despite the myth. The ultimate skin-barrier sealing ingredient.