0vaseline petroleum jelly vaseline petroleum jelly is a mixture of mineral oils paraffin and microcrystalline waxes that when blended together create something remarkable a smooth jelly that has a melting point just above body temperature the result it literally melts into skin flowing into the spaces between cells and the gaps in our lipid barrier once there it re solidifies locking itself in place vaseline petroleum jelly serves two functions first it helps keep the outside wor