What it is
Petrolatum is a purified blend of saturated hydrocarbons derived from petroleum, ranging from semi-liquid to soft solid. In formulations it forms an occlusive film on the skin surface that slows transepidermal water loss, making it a long-standing emollient and skin-protectant ingredient. Cosmetic-grade petrolatum is highly refined to meet purity specifications.
Safety & warnings
Cosmetic- and pharmaceutical-grade petrolatum is highly refined and has a strong record of tolerability, including on sensitive and compromised skin. It is occlusive, so on acne-prone individuals it may feel heavy, though well-refined petrolatum is widely regarded as non-comedogenic. Purity depends on proper refinement to remove polycyclic aromatic impurities.
Origin & sourcing
Synthetic in the sense of being refined from petroleum; it is a purified mixture of mineral hydrocarbons.
History
Petrolatum was first refined and popularized in the second half of the 19th century and has remained a staple occlusive ingredient in skincare ever since.
Questions everyone asks
What does petrolatum do in sunscreen?
It acts as an occlusive emollient, forming a film that helps reduce moisture loss and improve the feel of the product on skin.
Is petrolatum likely to clog pores?
Highly refined cosmetic-grade petrolatum is widely considered non-comedogenic, though its occlusive nature can feel heavy on acne-prone skin.