What is the primary function of a moisturizer in skincare?

The primary function of a moisturizer in skincare is to hydrate and maintain the skin's moisture barrier. Moisturizers are formulated to increase skin hydration levels by attracting and retaining water in the skin, which is essential for maintaining a healthy complexion. When the skin is well-hydrated, it appears plumper, smoother, and more youthful, and the moisture barrier helps to protect the skin from environmental stressors and irritants.

Additionally, moisturizers often contain emollients and occlusives that help to lock in moisture, preventing transepidermal water loss. This function is vital for all skin types, as even oily skin can become dehydrated if it lacks sufficient moisture. Keeping the skin's moisture barrier intact is crucial for overall skin health and can help to prevent conditions such as dryness, irritation, and sensitivity.

While other options, such as providing sun protection or removing dead skin cells, play important roles in a complete skincare routine, they do not represent the primary purpose of a moisturizer. Similarly, enhancing makeup application is a beneficial effect of some moisturizers but is not their main function.