Vaseline Petroleum Jelly Cocoa Butter is the original wonder jelly. It works by creating a sealing barrier between cells, which locks in moisture and speeds up your skin's natural recovery from dryness, helping it restore from within. Its occlusive function also allows it to protect dry, cracked skin and minor cuts and scrapes. Vaseline is an occlusive moisturizer, meaning that it seals moisture into the skin. To boost moisturization, you should apply the product to slightly damp skin. The presence of cocoa butter, which is known to nourish skin, keeps your skin healthy and radiant all day.