What characterizes an occlusive ingredient?

An occlusive ingredient is characterized by its ability to form a barrier on the skin's surface, effectively preventing moisture loss. This is primarily due to the nature of its heavy and large molecules, which create a protective seal that locks in hydration. By doing so, these ingredients help maintain skin moisture levels, making them particularly beneficial for individuals with dry or dehydrated skin conditions.

In contrast, lightweight molecules that absorb quickly are typically more emollient or hydrating in nature rather than occlusive. They don't provide the same level of moisture retention since they do not form a barrier. Substances that promote exfoliation focus on removing dead skin cells rather than retaining moisture, and ingredients that enhance color retention relate to cosmetic or makeup products which do not have the same function as occlusives in skin care. Thus, the defining property of occlusive ingredients lies in their ability to prevent water loss through their barrier-forming capabilities.