What is the primary benefit of using a toner after cleansing?

Using a toner after cleansing primarily serves to balance the skin's pH. Cleansing can often disrupt the skin's natural pH level, particularly if the cleanser is alkaline, which can lead to dryness or irritation. Toners are formulated to restore that balance, helping the skin to return to its optimal pH level, which is typically around 4.5 to 5.5. Maintaining the correct pH level is crucial as it helps preserve the skin's barrier function, enhancing its ability to retain moisture and defend against environmental aggressors.

While moisturizing the skin is important, this is not the primary function of a toner. Additionally, while some toners may have ingredients that offer some protection against sun damage or contribute to a protective barrier, these are not their main roles. Their essential purpose is to help balance pH after cleansing, facilitating better absorption of subsequent skincare products, and preparing the skin for further treatment or hydration.