Which of the following is a benefit of using serums over regular moisturizers?

Using serums provides the benefit of delivering more concentrated ingredients compared to regular moisturizers. Serums are formulated to contain a higher percentage of active ingredients, such as antioxidants, vitamins, and peptides, which can penetrate deeper into the skin due to their smaller molecular size. This concentrated formula allows for targeted treatment of specific skin concerns, such as fine lines, hyperpigmentation, or hydration deficits.

In contrast, regular moisturizers often contain a higher level of occlusive ingredients designed to hydrate and protect the skin's barrier, but they may not contain the same level of active ingredients. As such, serums are often used in conjunction with moisturizers, allowing for a layered approach to skincare that maximizes both hydration and targeted effects.

The other choices highlight aspects that do not accurately reflect the primary advantages of serums over traditional moisturizers. For example, serums are usually lighter in texture rather than thicker, are often used in conjunction with other products rather than as standalone options, and they are generally more expensive due to their concentrated formulations and specialized ingredients.