What is the primary function of a moisturizer?

The primary function of a moisturizer is to hydrate the skin and prevent water loss. Moisturizers work by providing essential moisture to the skin's outer layer, which is crucial for maintaining its elasticity and overall health. When skin is properly hydrated, it appears plumper, smoother, and more radiant. Furthermore, moisturizers often contain occlusive agents that help to seal in moisture and strengthen the skin’s natural barrier, preventing trans-epidermal water loss. This is particularly important for individuals with dry or dehydrated skin, as a well-formulated moisturizer can help restore and maintain the skin's hydration balance.

While sunscreens, dark spot treatments, and acne medications address specific skin concerns, they do not fulfill the fundamental purpose of hydrating the skin and preventing water loss, which is a vital role of moisturizers.