Understanding Moisturizer Ingredients

Occlusives increase the water content of the skin by slowing the evaporation of water from the surface of the skin. These ingredients are often greasy and are most effective when applied to damp skin. Mineral oil is often used because of its favorable texture, but it is not as effective at preventing evaporation of water as many other occlusives. Lanolin is expensive and potentially irritating. Silicone derivatives (dimethicone and cyclomethicone) are not greasy but have a limited moisturizing effect. They are often added to petroleum to make it feel less "greasy."